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WO2022012651A1 - Procédé de projection, dispositif de projection et support de stockage - Google Patents

Procédé de projection, dispositif de projection et support de stockage Download PDF

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Publication number
WO2022012651A1
WO2022012651A1 PCT/CN2021/106669 CN2021106669W WO2022012651A1 WO 2022012651 A1 WO2022012651 A1 WO 2022012651A1 CN 2021106669 W CN2021106669 W CN 2021106669W WO 2022012651 A1 WO2022012651 A1 WO 2022012651A1
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WIPO (PCT)
Prior art keywords
projection
image
projection position
target
projected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/106669
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English (en)
Chinese (zh)
Inventor
陈晨
叶鹭欣
龚晨晟
陈保林
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3191—Testing thereof

Definitions

  • the present application relates to the field of projection technology, and more particularly, to a projection method, a projection device, and a storage medium.
  • a projector also known as a projector, is a device that can project images or videos onto a screen. It can be connected to a computer, VCD, DVD, BD, game console, DV, etc. through different interfaces to play the corresponding video signal.
  • projectors have been widely used in various conferences and teaching, bringing great convenience to people's daily life.
  • the projector will generate a lot of heat during operation, and the projector's optics and lens will be thermally deformed during operation, resulting in a certain degree of pixel shift in the image output to the screen, resulting in the loss of imaging content. Or serious quality degradation, affecting the projection effect and the user's viewing experience.
  • the present application proposes a projection method, a projection device and a storage medium to improve the above problems.
  • an embodiment of the present application provides a projection method, which can be applied to a projection system.
  • the method includes: projecting a display image through a first light source, projecting a reference image at preset time intervals through a second light source, The display image and the reference image have the same projection optical axis; obtain the real-time projection position corresponding to the reference image; determine whether there is a difference between the real-time projection position and the target projection position; if so, adjust and project the display image , so that the real-time projection position approaches the target projection position.
  • an embodiment of the present application provides a projection method, which can be applied to a projection system.
  • the method includes: projecting a display image through a first light source, projecting a reference image at preset time intervals through a second light source, The display image and the reference image have different projection optical axes; obtain the real-time projection position corresponding to the reference image; determine whether there is a difference between the real-time projection position and the target projection position; if so, adjust and project the display image , so that the real-time projection position is adapted to the target projection position.
  • embodiments of the present application provide a projection device, including a picture acquisition module, a pixel offset detection module, an adjustment module, one or more processors, and a memory; one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs are configured to perform the method described in the first aspect or the second aspect above.
  • an embodiment of the present application provides a computer-readable storage medium, where a program code is stored in the computer-readable storage medium, wherein when the program code is executed, the first aspect or the second aspect is executed. method described.
  • a projection device and a storage medium provided by the present application, a display image is projected through a first light source, and a reference image is projected at a preset time interval through a second light source, wherein the display image and the reference image have the same Then, the real-time projection position corresponding to the reference image is obtained, and then it is judged whether there is a difference between the real-time projection position and the target projection position.
  • the projection position is approached to the target projection position, so that the obtained real-time projection position corresponding to the reference image projected by the second light source at a preset time interval is different from the target projection position by the above method.
  • Adjust the optical axis of the projected display image so that the real-time projection position can be approached to the target projection position, so as to adjust the projection effect without affecting the projection of the displayed image, so as to overcome the problem that the quality of the projection image is degraded due to pixel offset.
  • FIG. 1 shows an example diagram of pixel shift in a projected image in the prior art.
  • FIG. 2 shows a schematic structural diagram of a projection system proposed by an embodiment of the present application.
  • FIG. 3 shows a method flowchart of a projection method proposed by an embodiment of the present application.
  • FIG. 4 shows a schematic structural diagram of the color wheel in the embodiment of the present application.
  • FIG. 5 is a schematic time sequence diagram of the light modulation device modulating the projection position in the embodiment of the present application.
  • FIG. 6 shows a schematic diagram of the light path of the light modulation device for modulating the projection position provided by the embodiment of the present application.
  • FIG. 7 is a schematic diagram showing the positional relationship between the lens corresponding to the image acquisition module and the projection lens corresponding to the projection device in the embodiment of the present application.
  • FIG. 8 shows a method flowchart of a projection method proposed by another embodiment of the present application.
  • FIG. 9 shows a flow chart of the method of step S240 in FIG. 8 .
  • FIG. 10 shows an example diagram of the projected target test pattern provided by the embodiment of the present application.
  • FIG. 11 shows an example diagram of an implementation manner of adjusting the optical axis of the projected display image in the embodiment of the present application.
  • FIG. 12 shows an example diagram of an adjustment implementation principle corresponding to the embodiment in FIG. 11 .
  • FIG. 13 shows an example diagram of another implementation manner of adjusting the optical axis of the projected display image in the embodiment of the present application.
  • FIG. 14 shows a method flowchart of a projection method proposed by another embodiment of the present application.
  • FIG. 15 shows a method flowchart of a projection method proposed by another embodiment of the present application.
  • FIG. 16 shows another example diagram of the projected target test pattern provided by this embodiment.
  • FIG. 17 shows another example diagram of the projected target test pattern provided by this embodiment.
  • FIG. 18 shows a method flowchart of a projection method proposed by still another embodiment of the present application.
  • Fig. 19 shows an example diagram of the determination principle of the target projection position in the case of multiple projection devices provided by the embodiment of the present application.
  • FIG. 20 shows a structural block diagram of a projection apparatus of the present application for executing a projection method according to an embodiment of the present application.
  • FIG. 21 shows a storage unit for storing or carrying a program code for implementing a projection method according to an embodiment of the present application according to an embodiment of the present application.
  • the problem of out-of-focus of the picture is not serious, and the quality of the picture is at an acceptable level.
  • the design of the projector optics and lens is general, the out-of-focus image accompanied by pixel shift may cause the performance of the projector to be greatly reduced.
  • the two common projector optics and lenses are greatly affected.
  • the usage scenarios are as follows: 1. When multiple projectors are fused, the projection images of two adjacent projectors will overlap to a certain extent, as shown in the fusion area in Figure 1.
  • the offset of the two projectors is different to a certain extent and there is a large non-repeatability.
  • the fusion area displays content with a static single-pixel width, and the pixel offset is between 1 and 2 pixels, the images in the fusion area of the two projectors will have certain ghosts, resulting in serious image quality.
  • Descend as shown in the "middle" word in Figure 1. 2.
  • the projection screen is fixed on the projection surface, and the movement of the projection screen may cause the screen to exceed the border of the screen, resulting in the lack of imaging content or serious quality degradation.
  • the method of turning on the camera in advance each time is usually used to improve the picture quality, or the method of making the edge of the frame larger than that of the projected picture is used to allow a shift of 1 to 2 pixels, although it can be avoided to a certain extent.
  • the picture quality is degraded due to the pixel offset, but there is still a problem that the picture quality is not high and the user's visual experience is reduced.
  • the present application provides that when the obtained real-time projection position corresponding to the reference image projected by the second light source at a preset time interval is different from the target projection position, the projection display image can be adjusted by adjusting the projection position.
  • the projection display image can be adjusted by adjusting the projection position.
  • Optical axis so that the real-time projection position can be approached to the target projection position, so that the projection effect can be adjusted without affecting the projection of the displayed image, so as to overcome the problem of the degradation of the projection image quality caused by the pixel offset.
  • the projection system involved in the projection method provided by the embodiment of the present application is first introduced below.
  • the projection imaging module 11 is used to project various text materials or audio and video materials that need to be projected, and the specific projection content is not limited, and the image acquisition module 12 is used to obtain the real-time projection position corresponding to the reference image.
  • the information processing module 13 is used to judge whether there is a difference between the real-time projection position and the target projection position (which can be a pre-stored target projection position), and if there is a difference, convert the difference between the two into a position adjustment instruction and send it to the actuator 14 , so that the actuator 14 can adjust the optical axis of the projected display image according to the position adjustment instruction, so that the real-time projection position approaches the target projection position, that is, the real-time projection position is the same as the target projection position, or the real-time projection position is infinitely close to Target projection position.
  • Step S110 project the display image through the first light source, and project the reference image at a preset time interval through the second light source.
  • the first light source and the second light source in this embodiment may be light sources emitted by the same projection device, or may be light sources emitted by different projection devices.
  • the first light source and the second light source may be the same light source (herein can be understood as the same light source), or may be different light sources.
  • both the first light source and the second light source may emit visible light; in another implementation, the first light source may emit visible light, and the second light source may emit infrared light.
  • the display image can be understood as the projection image projected on the projection plane (the projection image is smaller than the projection plane, for example, the projection plane can be a wall, and the projection image is the area on the wall used to display the projected image), the reference image can be understood A test pattern that is projected at preset time intervals during projection of the display image, the test pattern can be used to test whether there is a difference between the projected position of the reference image and the target projected location.
  • the display image and the reference image in this embodiment may have the same projection optical axis.
  • the projected optical axes of the display image and the reference image may both be the optical axes of the optical-mechanical part of the projector.
  • the projection system in this embodiment may include a color wheel, wherein the color wheel may receive light from a light source and sequentially emit three-color sequential light such as red, green and blue.
  • a color wheel may receive light from a light source and sequentially emit three-color sequential light such as red, green and blue.
  • FIG. 4 uses FIG. 4 as an example to describe the color wheel in this embodiment. To give a brief description:
  • the color wheel 50 is located on the optical path where the light source light emitted by the light source is located.
  • the color wheel 50 includes at least two segmented regions 51 .
  • the period from the time when the two segmented areas 51 are adjacent to the end of crossing the two segmented areas 51 is a spoke period, and the area irradiated by the light spot in one spoke period constitutes a spoke area 52;
  • a spoke area 52 is divided into Two spoke areas (511 in Figure 15), the two spoke areas are respectively located in two adjacent segment areas 51, and the areas other than the spoke area 52 included in the two adjacent segment areas 51 constitute a Non-spoke region 513 .
  • the preset time interval may be the time interval during which the color wheel rotates to the spoke area, that is, the second light source may project the reference image within the time interval during which the color wheel rotates to the spoke area.
  • the step of projecting a reference image at a preset time interval through the second light source may be: rotate the color wheel to the spoke area corresponding to the color wheel When inside, turn off the visible light source and project the infrared test pattern.
  • the stray light of visible light is relatively bright, and the signal-to-noise ratio of the projection position of the projection image captured by the visible light camera is poor, so that the calculation accuracy of the latest projection position of the obtained display image is poor.
  • the visible light camera can be replaced with an infrared camera, and the infrared signal actively transmitted by the projector can be used as the information collected by the image acquisition module.
  • wavelengths other than the infrared light projected by the projector can be added before the camera, and the infrared signal can be displayed within the aforementioned preset time interval. For example, the time when the DMD is used to process the spoke can be used to display the infrared signal.
  • the image displayed in the non-spoke area 61 is in a modulated state
  • the displayed image in the spoke area 62 is in a non-modulated state.
  • the power of the visible light source is off, and the power of the infrared light source is on. In this way, the infrared test pattern can be projected in the spoke area to realize the adjustment of the projection lens in the spoke area.
  • the light path diagram corresponding to the projection process of FIG. 5 is shown.
  • the light source module includes infrared light and visible light. The method is combined into the same optical path.
  • the infrared light shown in FIG. 6 uses a separate infrared light source, and the wavelength can be 850nm or 940nm.
  • infrared light can also be realized by means of laser fluorescence, that is, a laser with a wavelength shorter than that of infrared light is used to excite the infrared phosphor, and the short wavelength can be blue laser or other laser.
  • the light emitted by the light source module is relayed to the display chip DMD through the optomechanical module, and the light modulated by the display chip is projected onto the screen through the lens module.
  • single-chip DMD, double-chip or three-chip DMD, or single-chip, double-chip, three-chip LCD, and LCoS can all be implemented by using the same principle, which is not repeated here.
  • the visible light source when the color wheel rotates into the spoke area corresponding to the color wheel, the visible light source is not turned off, and the test patterns of other light sources (for example, visible light sources) are projected.
  • the projection lens can be adjusted according to the test patterns of other light sources.
  • the image capture module is installed in a position that is less affected by the temperature change caused by the switching process of the projector. Not directly connected to the lens.
  • the projection ratio of the corresponding lens of the image acquisition module and the projection ratio of the projection lens of the projection device in the zoom state satisfy the formula:
  • the field of view of the corresponding lens of the image acquisition module and the field of view of the projection lens of the projection device in the zoom state satisfy the formula:
  • TR camera represents the throw ratio of the corresponding lens of the picture acquisition module
  • It represents the maximum throw ratio of the projection lens of the projection equipment in the zoom state
  • FOV camera represents the field of view of the corresponding lens of the image acquisition module
  • the image resolution of the image collected by the image acquisition module can distinguish a single pixel of the imaging image when the projection lens of the projection device is in the state of the smallest field of view, and the angular resolution of the corresponding lens of the image acquisition module satisfies the following formula: in, It represents the minimum angle of view of the projection lens of the projection device in the zoom state, and N represents the number of pixels on a side containing a larger number of pixels.
  • the pixel resolution of the lens corresponding to the image acquisition module is greater than the pixel resolution of the projection lens of the projection device.
  • the actuator in the embodiment of the present application may select a voice coil motor, or may select a piezoelectric ceramic or the like to execute the command sent by the information processing module.
  • the update frequency of the image position may comprehensively consider the time frequency of the large change of the screen position, the response frequency of the information acquisition module and the information processing module, and the response frequency of the actuator that can perform actions.
  • this embodiment can project a characteristic pattern in the interval between different image frames, and then use the characteristic pattern as a target test pattern.
  • Step S120 Obtain the real-time projection position corresponding to the reference image.
  • the real-time projection position corresponding to the reference image can be understood as the position where the reference image is projected onto the projection plane. technology, which will not be repeated here), obtain the real-time projection position corresponding to the reference image according to the projection plane and vertex coordinates.
  • the projection frequency of the reference image projected by the second light source may be acquired, and the real-time projection position corresponding to the reference image may be acquired according to the projection frequency.
  • Step S130 Determine whether there is a difference between the real-time projection position and the target projection position.
  • the target projection position can be understood as a pre-stored position where the displayed image is projected.
  • the position coordinates of the real-time projection position and the position coordinates of the target projection position can be compared to determine whether there is a difference between the real-time projection position and the target projection position.
  • the position coordinates of the real-time projection position and the target projection position If the position coordinates of the positions are different, it can be determined that there is a difference between the real-time projection position and the target projection position; if the position coordinates of the real-time projection position are the same as the position coordinates of the target projection position, it can be determined that there is no difference between the real-time projection position and the target projection position.
  • Step S140 Adjust the optical axis for projecting the display image, so that the real-time projection position approaches the target projection position.
  • the offset direction and the offset amount of the displayed image on the projection plane can be calculated according to the projection plane and the measured projection distance, so that the optical axis of the projected display image can be adjusted according to the offset direction and the offset amount.
  • the determination process can be ended.
  • a first light source projects a display image
  • a second light source projects a reference image at preset time intervals, wherein the display image and the reference image have the same projection optical axis
  • Obtain the real-time projection position corresponding to the reference image and then determine whether there is a difference between the real-time projection position and the target projection position.
  • the projection position is approximated, so that the obtained real-time projection position corresponding to the reference image projected by the second light source at a preset time interval differs from the target projection position by adjusting the light for projecting and displaying the image.
  • axis so that the real-time projection position can be approached to the target projection position, so that the projection effect can be adjusted without affecting the projection of the displayed image, so as to overcome the problem of the degradation of the projection image quality caused by the pixel offset.
  • FIG. 8 another embodiment of the present application provides a projection method, which is applied to a projection system, and the method includes:
  • Step S210 project the display image through the first light source, and project the reference image at preset time intervals through the second light source.
  • Step S220 Obtain the real-time projection position corresponding to the reference image.
  • Step S230 Determine whether there is a difference between the real-time projection position and the target projection position.
  • Step S240 obtaining the offset parameter corresponding to the difference according to the target test pattern.
  • the reference image in this embodiment may be a target test pattern, and the specific content of the target test pattern (for example, the pattern style and the number of patterns) may be set according to actual requirements.
  • the pattern shape of the target test pattern may be a triangle, a positive direction, a rectangle, etc.
  • the pattern content of the target test pattern may be stripes or squares, etc., which may not be specifically limited.
  • the outline size of the target test pattern may be equal to that of the projected picture, or the outline size of the target test pattern may be smaller than the outline of the projected picture.
  • the offset parameter corresponding to the above-mentioned difference can be obtained according to the target test pattern.
  • the offset parameter and offset here can be understood as the offset direction and offset of the real-time projection position relative to the target projection position.
  • step S240 may include:
  • Step S241 Acquire first coordinates corresponding to the target projection position.
  • the target projection position may be the vertex of the projection screen, and the first coordinate may be the position coordinate of the vertex.
  • the pre-stored target projection position may be obtained from the information processing module of the aforementioned projection system, and then the target projection position may be obtained. Obtain the first coordinate corresponding to the target projection position.
  • Step S242 Acquire second coordinates corresponding to the real-time projection position based on the target test pattern.
  • the second coordinate is the coordinate of the current projection position.
  • the second coordinate corresponding to the real-time projection position can be obtained based on the target test pattern. For example, the projection distance of the target test pattern can be obtained, and then the projection distance can be obtained according to the projection distance. And the vertex of the target test pattern acquires the second coordinate corresponding to the real-time projection position.
  • FIG. 10 shows an example diagram of the projected target test pattern provided by the embodiment of the present application.
  • the vertices of the projection screen 21 are respectively A 0 , B 0 , C 0 , D 0
  • the coordinates corresponding to vertices A 0 , B 0 , C 0 , D 0 are
  • the vertices of the target test pattern 22 are A, B, C, and D respectively.
  • the coordinates corresponding to the vertices A 0 , B 0 , C 0 , and D 0 can be combined
  • the second coordinate corresponding to the real-time projection position can be obtained, wherein the specific calculation principle and calculation process can refer to the related art, which will not be repeated here.
  • Step S243 Acquire an offset direction and an offset amount of the second coordinate relative to the first coordinate based on a specified rule.
  • the scaling factor of the current projected image relative to the pre-stored initial projected image, V represents the amount of pixel translation of the current projected image, and [X 0 , Y 0 ] represents the coordinates of the vertices of the projected image.
  • an offset direction of the second coordinate relative to the first coordinate may be determined based on a scaling factor, and an offset amount of the second coordinate relative to the first coordinate may be determined based on the translation amount.
  • the offset direction and offset amount obtained above can be used as offset parameters corresponding to the pixel offset, so that the projection position can be adjusted based on the offset parameters.
  • Step S250 Adjust the optical axis for projecting the display image according to the offset parameter, so that the real-time projection position approaches the target projection position.
  • the lens of the projection lens can be translated according to the offset parameter to adjust the optical axis of the projected display image, that is, the projection position can be adjusted by shifting the lens of the projection lens based on the offset parameter.
  • the offset parameter which can be to translate a certain lens in the projection lens.
  • FIG. 11 shows an example diagram of adjusting the optical axis of the projected display image based on the offset parameter.
  • the projection lens 23 includes a lens 231 , a lens 232 and The lens 233, optionally, can adjust the lens 232 according to the direction of the arrow as shown in FIG. 11 (which can be horizontal left and horizontal right) based on the above offset parameters.
  • the screen of the projected image The central axis will be deflected, so that the image of the projection screen can move as a whole, so as to realize the adjustment of the offset of the pixels at the projected position.
  • the projected image on the projection screen may move by 1-2 pixels.
  • the coil A and the coil B can be connected to the same circuit, and the coil C and the coil D can be connected to the same circuit.
  • the magnetic field generated by the coil will be the same as that near the coil.
  • the permanent magnet interacts to push the coil to move.
  • the coil is fixed with the positioning device of the lens of the lens 23. The movement of the coil can push the lens to move, so that a certain lens in the projection lens can be translated in this way. .
  • a parallel plate with a certain angle ⁇ to the optical axis can be added to the imaging optical path during the projection process, so that the optical axis is shifted to a certain extent.
  • the overall translation of the pixels of the projection screen is realized by means of angles.
  • the parallel plate can be rotated according to the aforementioned offset parameters. For the specific implementation process of the rotation, please refer to the related art, which will not be repeated here. Repeat.
  • a visible light camera may be used to collect the projection image.
  • the acquisition camera can be selected according to the following criteria: (1) The FOV of the camera lens needs to be greater than the corresponding FOV when the throw ratio is 1.2:1, that is, the half angle is (2)
  • the pixel resolution of the camera is not less than 1920*1080, and the pixel size of the camera is not larger than Among them, a voice coil motor (VCM: Voice Coil Motor) can be used as an actuator to drive a mirror in the lens to adjust the overall translation of the picture, and the zoom of the picture can be adjusted by moving the mirror along the optical axis.
  • VCM Voice Coil Motor
  • a projection method provided by the present application realizes that in the case where the real-time projection position corresponding to the reference image projected by the second light source at a preset time interval is different from the target projection position, the projection method can be obtained according to the projected target test pattern.
  • the offset direction and offset amount corresponding to the pixel offset, and then the optical axis of the projected display image is adjusted based on the offset direction and offset amount, so as to realize the adjustment of the projection effect without affecting the image projection process, so as to overcome the The problem of degradation of projected image quality due to pixel offset.
  • FIG. 14 another embodiment of the present application provides a projection method, which is applied to a projection system, and the method includes:
  • Step S310 Projecting the display image through the first light source, and projecting the reference image at preset time intervals through the second light source.
  • Step S320 Obtain the real-time projection position corresponding to the reference image.
  • Step S330 Determine whether there is a difference between the real-time projection position and the target projection position.
  • Step S340 Obtain the resolution level corresponding to the target test pattern.
  • the pixels of the test pattern in this embodiment may correspond to various density levels.
  • resolution levels corresponding to different density levels may be set and stored. For example, it can be set that the denser the pixels correspond to the lower the resolution level, or it can be set that the denser the pixels correspond to the higher resolution level according to the actual situation.
  • the resolution level corresponding to the target test pattern can be obtained, so that the adjustment degree of the picture can be determined according to the resolution level.
  • Step S350 Acquire adjustment parameters matching the resolution level.
  • the content of the target test pattern is stripes
  • the currently obtained resolution level is the lowest resolution level.
  • the stripes are very dense, and the image may be out of focus, and the target test pattern may not be accurately detected.
  • you can make rough adjustments to the projection screen for example, you can select the projection width or a test pattern with a relatively large projection accuracy to adjust the projection screen
  • the adjustment process from coarse adjustment to fine adjustment can be performed periodically according to the actual situation. implementation.
  • the adjustment of the accuracy of the projected image through different degrees of adjustment may be the accuracy adjustment for the entire area of the projected image, or the accuracy adjustment for a partial area of the projected image, for example, If the projected content in the projected image is located in a corner of the projected image, you can only adjust the projected image precision for that corner.
  • Step S360 Use the adjustment parameter as an offset parameter corresponding to the difference.
  • the above-mentioned adjustment parameters can be used as offset parameters corresponding to the pixel offset.
  • Step S370 Adjust the optical axis for projecting the display image according to the offset parameter, so that the real-time projection position approaches the target projection position.
  • a projection method provided by the present application realizes that in the case where the real-time projection position corresponding to the reference image projected by the second light source at a preset time interval is different from the target projection position, the projection is based on the obtained offset parameter.
  • the optical axis of the displayed image is adjusted with step-by-step precision, so that the projection effect can be adjusted without affecting the image projection process, so as to overcome the problem of the degradation of the projected image quality caused by the pixel offset.
  • FIG. 15 another embodiment of the present application provides a projection method, which is applied to a projection system, and the method includes:
  • Step S410 project the display image through the first light source, and project the reference image at preset time intervals through the second light source.
  • Step S420 Obtain the real-time projection position corresponding to the reference image.
  • Step S430 Determine whether there is a difference between the real-time projection position and the target projection position.
  • Step S440 Obtain the identification pattern content of the target test pattern.
  • the change of the projection lens may cause changes in different directions or different mirror images of the projected image, thereby affecting the projection effect of the projected image or the quality of the projected image.
  • this implementation For example, target test patterns with different pattern contents can be projected at preset time intervals by the second light source, so as to realize the precision adjustment of the projected image in each position and direction.
  • target test patterns with different pattern contents can be alternately projected on the projection screen; Project target test patterns with different pattern contents.
  • the projection screen includes area A, area B, area C, and area D.
  • the pattern content of the target test pattern corresponding to area A is vertical stripes, and area B
  • the pattern content of the corresponding target test pattern is horizontal stripes, the pattern content of the target test pattern corresponding to area C is a square, and the pattern content of the target test pattern corresponding to area D is a mosaic style square.
  • the pattern contents of the target test patterns corresponding to the area C and the area D are set to be different, so that the precision adjustment in each position direction of the projected image can be realized through different target test patterns, that is, the fine adjustment can be gradually realized.
  • the pattern content of the target test pattern can be acquired, so that the adjustment accuracy of the projected image can be determined according to the pattern content.
  • the amount of calculation may be increased to a certain extent, thereby affecting the projection effect.
  • an image mask with a certain tolerance can be superimposed on the projected image on the basis shown in Figure 16, so that it can be ignored in the calculation process
  • the data calculation of the area where the mask is located can reduce the calculation amount of image processing, thereby improving the projection effect.
  • the specific position and overlapping area of the mask in the projected image may not be limited.
  • Step S450 Obtain the adjustment direction corresponding to the content of the identification pattern.
  • the adjustment directions corresponding to different pattern contents may be different, and it can also be understood that the precision adjustment directions corresponding to different pattern contents may be different, and different pattern contents and corresponding adjustment directions may be preconfigured and stored in a mapping relationship.
  • the pattern content of the target test pattern in the area where vertex A is located is vertical stripes
  • the corresponding adjustment direction is the horizontal precision direction
  • the pattern content of the target test pattern in the area where vertex B is located is horizontal stripes
  • the corresponding The adjustment direction is the vertical precision direction. In this way, the adjustment direction corresponding to the pattern content of the current target test pattern can be obtained.
  • Step S460 Use the adjustment direction as an offset parameter corresponding to the difference.
  • Step S470 Adjust the optical axis on which the display image is projected according to the offset parameter, so that the real-time projection position approaches the target projection position.
  • a projection method provided by the present application realizes that in the case where the real-time projection position corresponding to the reference image projected by the second light source at a preset time interval is different from the target projection position, the projection is based on the obtained offset parameter.
  • the optical axis of the displayed image is adjusted with step-by-step precision, so that the projection effect can be adjusted without affecting the image projection process, so as to overcome the problem of the degradation of the projected image quality caused by the pixel offset. Adjusting the projection position in different directions through patterns of different contents can improve the accuracy of the adjusted image.
  • FIG. 18 another embodiment of the present application provides a projection method, which can be applied to a projection system.
  • the difference between this embodiment and the previous embodiments is that this embodiment is applicable to the need for splicing multiple projectors
  • the implementation process and implementation principle of other steps in this embodiment may refer to the relevant descriptions in the foregoing embodiments, which will not be repeated here.
  • the method includes:
  • Step S510 project the display image through the first light source, and project the reference image at preset time intervals through the second light source.
  • the display image and the reference image in this embodiment have different projection optical axes.
  • Step S520 Obtain the real-time projection position corresponding to the reference image.
  • the projection system in this embodiment may further include a projection device, and the target projection position may be a position after the projection device is thermally stabilized or a designated position on the projection surface.
  • the designated position may be a fixed position on the projection screen, for example, the fixed position on the projection screen may be determined by placing fixed infrared scattering points on the projection screen.
  • one projector can be identified as the main projector and numbered as P0, and its pixel offset does not need to be automatically compensated;
  • a projector spliced with one projector is identified as a secondary projector, numbered P1, and its pixel offset can be automatically compensated according to the projected image of the previous projector P0 spliced with it.
  • the reference point of the projector can be selected at In the fusion area with P0; similarly, another projector spliced with projector P1 can be identified as a secondary projector, numbered P2, and its pixel offset can be based on the projection image of the previous projector P1 spliced with it.
  • Perform automatic compensation At this time, the reference position point of the projector can be selected in the fusion area with the projector P1.
  • Step S530 Determine whether there is a difference between the real-time projection position and the target projection position.
  • Step S540 If yes, adjust the optical axis for projecting the display image, so that the real-time projection position is adapted to the target projection position.
  • the optical axis of the projected display image can be adjusted so that the real-time projection position can be adapted to the target projection position.
  • the projection position approaches a preset relative position, where the preset relative position can be understood as the position where the fusion area is located as shown in FIG. 19 .
  • a projection method provided by the present application realizes that in the case where the real-time projection position corresponding to the reference image projected by the second light source at a preset time interval is different from the target projection position, the projection is based on the obtained offset parameter.
  • the optical axis of the displayed image is adjusted with step-by-step precision, so that the projection effect can be adjusted without affecting the image projection process, so as to overcome the problem of the degradation of the projected image quality caused by the pixel offset.
  • pixel offset compensation can be performed on the adjacent projector by performing automatic compensation on the projected image of the previous projector P1 to be spliced, so that the pixels can be improved. Accuracy of offset compensation.
  • a projection device provided by the present application will be described below with reference to FIG. 20 .
  • an embodiment of the present application further provides another projection device 100 that can execute the above-mentioned projection method.
  • the projection device 100 includes one or more (only one shown in the figure) processors 102 coupled with each other, a memory 104, a picture acquisition module 11, a pixel offset detection module 12, and an adjustment module for adjusting the pixel offset of the projected picture. 13.
  • the memory 104 stores a program that can execute the content in the foregoing embodiments, and the processor 102 can execute the program stored in the memory 104 .
  • the processor 102 may include one or more processing cores.
  • the processor 102 uses various interfaces and lines to connect various parts of the entire projection apparatus 100, and executes by running or executing the instructions, programs, code sets or instruction sets stored in the memory 104, and calling the data stored in the memory 104.
  • the processor 102 may adopt at least one of digital signal processing (Digital Signal Processing, DSP), field-programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA).
  • DSP Digital Signal Processing
  • FPGA Field-Programmable Gate Array
  • PLA programmable logic array
  • the processor 102 may integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a video image processing unit (Graphics Processing Unit, GPU), a modem, and the like.
  • CPU Central Processing Unit
  • GPU Graphics Processing Unit
  • the CPU mainly handles the operating system, user interface and application programs, etc.
  • the GPU is used for rendering and drawing of the display content
  • the modem is used to handle wireless communication. It can be understood that, the above-mentioned modem may not be integrated into the processor 102, and is implemented by a communication chip alone.
  • the memory 104 may include random access memory (Random Access Memory, RAM), or may include read-only memory (Read-Only Memory). Memory 104 may be used to store instructions, programs, codes, sets of codes, or sets of instructions.
  • the memory 104 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function (such as a video image projection playback function, etc.), for implementing the above Instructions for method embodiments, etc.
  • the storage data area may also store data (such as audio and video data, chat record data) created by the projection device 100 during use.
  • the image acquisition module 11 is configured to acquire the real-time projection position corresponding to the reference image.
  • the picture acquisition module in this embodiment may be a module inside the projection device, or may be a device that has external communication with the projection device.
  • the pixel offset detection module 12 is used to determine whether there is a difference between the real-time projection position and the target projection position.
  • the adjustment module 13 is used to adjust the optical axis of the projected display image if it is determined that there is a difference between the real-time projection position and the target projection position, and then it can be determined that there is a pixel offset, so that the real-time projection position is approached to the target projection position, so that the adjusted The real-time projection position is the same as the target projection position, or the adjusted real-time projection position is infinitely close to the target projection position.
  • FIG. 21 shows a structural block diagram of a computer-readable storage medium provided by an embodiment of the present application.
  • the computer-readable medium 600 stores program codes, and the program codes can be invoked by the processor to execute the methods described in the above method embodiments.
  • the computer-readable storage medium 600 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM.
  • the computer-readable storage medium 600 includes a non-transitory computer-readable storage medium.
  • Computer readable storage medium 600 has storage space for program code 610 to perform any of the method steps in the above-described methods.
  • the program codes can be read from or written to one or more computer program products.
  • Program code 610 may be compressed, for example, in a suitable form.
  • a projection method, a projection device and a storage medium use a first light source to project a display image, and then use a second light source to project a reference image at preset time intervals, wherein the display image and all The reference image has the same projection optical axis, and then the real-time projection position corresponding to the reference image is obtained, and then it is judged whether there is a difference between the real-time projection position and the target projection position, and if so, adjust the projection of the optical axis of the display image, So that the real-time projection position is approached to the target projection position, so that the obtained real-time projection position corresponding to the reference image projected by the second light source at a preset time interval is different from the target projection position through the above method.
  • the optical axis of the projected display image can be adjusted so that the real-time projection position can approach the target projection position, so that the projection effect can be adjusted without affecting the projection of the displayed image to overcome the projection caused by pixel offset.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Projection Apparatus (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

Les modes de réalisation de la présente demande concernent un procédé de projection, un dispositif de projection et un support de stockage. Le procédé de projection comprend : la projection d'une image d'affichage au moyen d'une première source de lumière, et la projection d'une image de référence au moyen d'une seconde source de lumière à un intervalle de temps prédéfini ; l'acquisition de la position de projection en temps réel correspondant à l'image de référence ; le fait de déterminer si la position de projection en temps réel est différente d'une position de projection cible ; et si c'est le cas, l'ajustement de l'axe optique pour projeter l'image d'affichage pour permettre à la position de projection en temps réel d'être plus proche de la position de projection cible. De cette façon, lorsque la position de projection en temps réel obtenue correspondant à une image de référence projetée par une seconde source de lumière à un intervalle de temps prédéfini est différente d'une position de projection cible, l'axe optique pour projeter une image d'affichage peut être ajusté pour permettre à la position de projection en temps réel d'être plus proche de la position de projection cible, ce qui réalise un ajustement de l'effet de projection sans dégrader la projection de l'image d'affichage, et résout le problème selon lequel la qualité de l'image projetée est réduite en raison d'un décalage de pixels.
PCT/CN2021/106669 2020-07-17 2021-07-16 Procédé de projection, dispositif de projection et support de stockage Ceased WO2022012651A1 (fr)

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