CN103167299A - Method and equipment used for generating three-dimensional (3D) video on a resource-limited device - Google Patents
Method and equipment used for generating three-dimensional (3D) video on a resource-limited device Download PDFInfo
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Abstract
The invention provides a method and equipment used for generating a three-dimensional (3D) video on a resource-limited device. The method used for generating the 3D video on the resource-limited device comprises steps as below: a pretreatment step of files and an execution step, wherein the pretreatment step of the files is used for processing files of a 3D world, namely, converting the files of the 3D world into a 1.0*1.0*1.0 normalization space and storing the files of the 3D world in the mode of fixed-point numbers. The execution step is used for using the stored pretreatment files of the 3D world to generate videos of the left eye and the right eye in real time, and generating the 3D video through overlapping of the video of the left eye and the video of the right eye. The method and the equipment used for the 3D video on the resource-limited device have the advantages that the 3D imaging technology can be applied to resource-limited devices without a graphic processing unit (GPU) and only capable of operating fixed-point numbers.
Description
Technical field
Three-dimensional (3D) imaging technique of relate generally to of the present invention more specifically, relates to for produce the method and apparatus of stereo 3 D image on resource-constrained devices.
Background technology
From fascinating film special efficacy, to medical imaging, electronic game and more field, the 3D imaging technique is the brand-new revolution in an audiovisual field beyond doubt.Especially stereo 3 D image can bring the audience visual experience more on the spot in person.The attack that head-on attacks, forest like a dream, the available wild beast of tentacle ..., three-dimensional 3D technology makes spectators slowly approach more real viewing experience.
The technology that produces traditionally stereo 3 D image is to utilize two of people's parallax, produces respectively left-eye image and eye image, and by superimposed these two images of variety of way, thereby make the beholder produce three-dimensional impression.Want to produce real-time stereo 3 D image, need to produce in real time left-eye image and eye image and both are superimposed, thereby make the beholder can continue to experience third dimension.Usually, for real-time stereo 3 D image, the processing speed that people can accept is that per second produces and shows at least 8 two field pictures.Want the processing speed that reaches such, the media platform that General Requirements produces real-time stereo 3 D image satisfies following condition:
(1) platform need to have the Graphics Processing Unit (GPU) for the 3D graphics process, thereby can draw fast enough the image that right and left eyes separates;
(2) because the render process of real-time 3D image need to be used a large amount of floating point arithmetics, so platform hardware need to have the floating point arithmetic ability.
The imaging technique of stereo 3 D image has been widely used in PC, television set, big game platform etc. in real time.These media platforms all dispose efficient Graphics Processing Unit (GPU), and CPU itself possesses the floating point arithmetic instruction of hardware implement simultaneously, or has the auxiliary processor that carries out floating point arithmetic, for example arithmetic processing unit (MPU).Thereby the generation of stereo 3 D image in real time can be accelerated function and reach with a large amount of floating point arithmetics by the powerful drawing of GPU.
Yet, for the equipment that does not have GPU and even do not provide hardware floating point arithmetic ability, can't realize producing in real time stereo 3 D image.
Summary of the invention
In view of the above problems, the present invention proposes a kind of for produce novel method and the device of stereo 3 D image on resource-constrained devices.
So-called " resource-constrained devices ", it is defined as not having GPU, only has the equipment platform that single CPU and this CPU do not support floating point arithmetic.
According to first aspect present invention, a kind of method for generation of stereo 3 D image is provided, described method comprises: the pre-processing of the information step, for the treatment of 3D world data, described 3D world data be transformed in 1.0 * 1.0 * 1.0 regular space and store in the fixed-point number mode; And execution in step, be used for to use the pretreated 3D world data of storing, produce in real time the right and left eyes image, and produce stereo 3 D image by superimposed right and left eyes image.
Described pre-processing of the information step can comprise: all the 3D objects in the scanning 3D world, to determine the minimum envelop border; Determine that an optimal fixed point counts expression formula, this expression formula has the optimal approximation accuracy of the original floating number of simulation; 3D world data is transformed in regular space, to produce normalized 3D world data; And count the normalized 3D of expression formula storage world data according to determined optimal fixed point.
Described execution in step can comprise: all the 3D objects in the real time scan 3D world; According to the normalized 3D world data of storing, with each 3D Coordinate Conversion of each 3D object to the 2D screen coordinate; According to the depth capacity of all screen coordinate points, calculate the maximum horizontal deviant of viewport; According to the degree of depth of each screen coordinate point, calculate the horizontal-shift value of this screen coordinate point; According to the maximum horizontal deviant of viewport and the horizontal-shift value of each screen coordinate point, produce left-eye images and right-eye image; And left-eye images and right-eye image are superimposed on single screen, to form stereo 3 D image.
According to second aspect present invention, a kind of device for generation of stereo 3 D image is provided, described device comprises: the pre-processing of the information device, for the treatment of 3D world data, 3D world data be transformed in 1.0 * 1.0 * 1.0 regular space and store in the fixed-point number mode; And final controlling element, be used for to use the pretreated 3D world data of storing, produce in real time the right and left eyes image, and produce stereo 3 D image by superimposed right and left eyes image.
Described pre-processing of the information device can comprise: scanning element, for all 3D objects in the scanning 3D world, with definite minimum envelop border; Optimal fixed point is counted the expression formula computing unit, is used for a definite optimal fixed point and counts expression formula, and this expression formula has the optimal approximation accuracy of the original floating number of simulation; The normalization unit is used for 3D world data is transformed into regular space, to produce normalized 3D world data; And memory cell, be used for counting the expression formula normalized 3D of storage world data according to determined optimal fixed point.
Described final controlling element can comprise: the real time scan unit is used for all 3D objects in the real time scan 3D world; Coordinate transformation unit is used for according to the normalized 3D world data of storing, with each 3D Coordinate Conversion of each 3D object to the 2D screen coordinate; The first computing unit is used for the depth capacity according to all screen coordinate points, calculates the maximum horizontal deviant of viewport; The second computing unit is used for the degree of depth according to each screen coordinate point, calculates the horizontal-shift value of this screen coordinate point; Right and left eyes image generation unit is used for according to the maximum horizontal deviant of viewport and the horizontal-shift value of each screen coordinate point, produces left-eye images and right-eye image; And superimposed unit, be used for left-eye images and right-eye image are superimposed on single screen, to form stereo 3 D image.
According to third aspect present invention, a kind of terminal equipment that produces stereo 3 D image is provided, described terminal equipment comprises above-mentioned device for generation of stereo 3 D image.For example, this terminal equipment can be mobile device, television set, media player, PC, gaming platform and the equipment that can produce and show arbitrarily stereo 3 D image.In one embodiment, terminal equipment can be resource-constrained devices, and this resource-constrained devices does not have GPU and only supports the fixed-point number computing.
Utilize the present invention, can only produce stereo 3 D image with the fixed-point number computing on resource-constrained platform, originally can't realize that the equipment platform of three-dimensional 3D imaging also can produce stereo 3 D image in real time thereby make.
From the detailed description below in conjunction with accompanying drawing, can find out other features and advantages of the present invention.Note, the present invention is not limited to the example shown in figure or any specific embodiment.
Description of drawings
By reference to the accompanying drawings, from following detailed description to the embodiment of the present invention, will understand better the present invention, similarly indicate similar part with reference to mark in accompanying drawing, wherein:
Fig. 1 is the block diagram that the internal structure of the terminal equipment 100 that can realize generation stereo 3 D image of the present invention is shown;
Fig. 2 is according to one embodiment of the invention, is shown in further detail the block diagram of the internal structure of pre-processing of the information device 1011 in block diagram shown in Figure 1 and final controlling element 1012;
Fig. 3 is according to one embodiment of the invention, and the flow chart of the processing in pre-processing of the information stage is shown; And
Fig. 4 is according to one embodiment of the invention, and the flow chart of the processing of execution phase is shown.
Embodiment
Fig. 1 is the block diagram that the internal structure of the terminal equipment 100 that can realize generation stereo 3 D image of the present invention is shown.
As mentioned above, technology of the present invention can be applied to any terminal equipment that real-time generation is arranged and show the stereo 3 D image demand, such as mobile phone, television set, PC, big game platform etc.Scheme with prior art is different, and technology of the present invention can also be applied to resource-constrained platform.So-called " resource-constrained devices " is not have GPU, only has the equipment platform that single CPU and CPU do not support floating point arithmetic.
Terminal equipment 100 as shown in Figure 1 comprises stereo 3 D image generation device 101, memory cell 102 and can show the display unit 103 of stereo 3 D image.The parts relevant to technology of the present invention of equipment 100 only are shown in Fig. 1, and other conventional components are omitted.
Technology of the present invention is divided into two stages with the production process of stereo 3 D image: pre-processing of the information stage and execution phase.The pre-processing of the information stage is responsible for 3D world data is carried out preliminary treatment, and whole 3D scene conversion in regular space, and is stored normalized 3D world data in the fixed-point number mode.Execution phase is responsible for according to pretreated 3D world's data real-time operation right and left eyes image, and is folded on single screen and forms stereo 3 D image.
Stereo 3 D image generation device 101 further is configured to comprise pre-processing of the information device 1011 and final controlling element 1012.
Fig. 2 is according to one embodiment of the invention, is shown in further detail the block diagram of the internal structure of pre-processing of the information device 1011 in block diagram shown in Figure 1 and final controlling element 1012.As shown in Figure 2, pre-processing of the information device 1011 comprises scanning element 201, optimal fixed point is counted expression formula computing unit 202 and regular unit 203, and optional look-up table is set up unit 210.Final controlling element 1012 comprises real time scan unit 204, coordinate transformation unit 205, the first computing unit 206, the second computing unit 207, right and left eyes image generation unit 208 and superimposed unit 209.
Below, describe the course of work according to the method for real-time generation stereo 3 D image of the present invention in detail in connection with Fig. 2, Fig. 3 and Fig. 4.Fig. 3 illustrates the flow chart of the processing in pre-processing of the information stage, and Fig. 4 illustrates the flow chart of the processing of execution phase.
At first, as shown in Figure 3, pre-processing of the information device 1011 carries out preliminary treatment in the pre-processing of the information stage to 3D world data.This stage starts from step 301, and all 3D objects in the scanning element 201 scanning 3D world wherein are to obtain 3D world data.
According to the present invention, because the CPU of fixed-point number computing is carried out in an existence on resource-constrained platform, so all 3D data all need to be stored in the fixed-point number mode.For this reason, in step 302, optimal fixed point is counted expression formula computing unit 202 according to the relative position of 3D object in the 3D world, determines that an optimal fixed point counts expression formula, and this expression formula has the optimal approximation accuracy of the original floating number of fixed-point number simulation.In step 303, regular unit 203 is transformed into 3D world data in 1.0 * 1.0 * 1.0 regular space, to produce normalized 3D world data.Then, in step 304, count the determined optimal fixed point of expression formula computing unit 202 according to optimal fixed point and count expression formula, normalized 3D world data is stored into memory cell 102 in the fixed-point number mode.
Pre-processing of the information device 1011 comprises that also optional look-up table sets up unit 210.As optional step, in the flow chart of Fig. 3, step 305 is set up the degree of depth-shift ratio look-up table.This look-up table also is stored in memory cell 102 subsequently.About the details of the degree of depth-shift ratio look-up table, will describe in detail in the execution phase below.
After the pre-processing of the information stage finished, final controlling element 1012 beginnings generated the right and left eyes image according to pretreated 3D world data in real time, and with the right and left eyes image lamination to the single screen of display unit 103, to form the stereo 3 D image of Gong watching.
For example, in the execution phase, the present invention carries out comparing of the degree of depth and focus with 3D coordinate data, and inverse returns binocular parallax, thereby calculates the last pixel that needs the stereo 3 D image of separation, and individual pixel is used for the deviant of non-stereo 3 D image originally.Synthesize at last the aberration image that can produce stereoeffect.
As shown in Figure 4, all 3D objects (step 401) in the 204 real time scan 3D worlds, real time scan unit.In step 402, coordinate transformation unit 205 is according to the pretreated 3D world data of storing in the pre-processing of the information stage, and each 3D coordinate points of each 3D object is transformed into screen (2D) coordinate.Then, in step 403, the first computing unit 206 calculates the maximum horizontal deviant of viewport (viewport) according to the depth capacity of all screen coordinate points.
In step 404, the second computing unit 207 calculates the horizontal-shift value of this screen coordinate point according to the degree of depth of each screen coordinate point.
The below provides the example of a calculated level deviant.It should be noted that the present invention is not limited to this example.Those skilled in the art it is contemplated that other modes come the calculated level deviant.
Here, suppose all depth values between 0.0-1.0,1.0 expressions are near screen, and 0.0 represents the darkest visible distance.Focus represents the as seen degree of depth of the focus in the 3D world of naked eyes, and when this degree of depth, the parallax of right and left eyes focuses on same point.Focus is the value between 0.0-1.0.
For speed-up computation on resource-constrained platform, the interval of 0.0-1.0 is expressed as the interval of 0-32767 with fixed-point number.
If the depth value of current screen coordinate points is defined as depth, and define the offset_max representative corresponding to the maximum horizontal deviant of depth capacity, the horizontal-shift value offset corresponding with depth value depth is defined as:
Offset=(depth-focus)/(1.0-focus) * offset_max, (formula 1)
Be expressed as with fixed-point number:
Offseti=(depthi-focusi)/(32767-focusi) * offset_maxi (formula 2)
For further speed-up computation and do not use division fully, the present invention's imagination is with the horizontal-shift ratio, namely " (depthi-focusi)/(32767-focusi) " is divided into 64 intervals according to depth value, and calculate in advance the corresponding shift ratio of each interval depth value, comprise 64 integer-valued look-up tables thereby produce one.Namely, above-mentionedly set up the degree of depth set up unit 210-shift ratio look-up table by look-up table in the step 305 of Fig. 3.Then, in the execution phase of Fig. 4, the second computing unit 207 for example can be retrieved this look-up table according to the depth value of each screen coordinate point, finding fast the shift ratio corresponding with this depth value, then calculates the horizontal-shift value of this screen coordinate point according to formula (2).
Then, in step 405, right and left eyes image generation unit 208 produces left-eye images and right-eye image according to the maximum horizontal deviant of the viewport that calculates and the horizontal-shift value of each screen coordinate point.Because the technology that produces the right and left eyes image by calculating side-play amount is that this area is commonly used, therefore omit its ins and outs here.Those skilled in the art can produce with method known in any field the right and left eyes image.For example, in the situation that adopt scheme of color separation, the right and left eyes image can be red, blue pixel.In the case, the beholder can watch stereo 3 D image by wearing red blue glasses.But technology of the present invention is not limited to this.The present invention also can be applied to other three-dimensional 3D imaging technique, for example bore hole 3D.
At last, in step 406, superimposed unit 209 is superimposed on left-eye images and right-eye image on single screen, thereby forms stereo 3 D image.
As mentioned above, the present invention proposes a kind of method for real-time generation stereo 3 D image on terminal equipment.Be different from prior art, method of the present invention can be applied to resource-constrained platform.On resource-constrained platform, unless increase the ability of GPU and hardware floating point arithmetic, otherwise can't obtain effect of the present invention.
The above has been described with reference to the drawings according to a particular embodiment of the invention.But the present invention is not limited to the customized configuration shown in figure and processing.And, for brevity, omit the detailed description to the known method technology here.In the above-described embodiments, describe and show some concrete steps as example.But procedure of the present invention is not limited to the concrete steps that institute describes and illustrates, and those skilled in the art can make various changes, modification and interpolation after understanding spirit of the present invention, perhaps change the order between step.
Element of the present invention can be implemented as hardware, software, firmware or their combination, and can be used in their system, subsystem, parts or subassembly.When realizing with software mode, element of the present invention is program or the code segment that is used to carry out required task.Program or code segment can be stored in machine readable media, perhaps send at transmission medium or communication links by the data-signal that carries in carrier wave." machine readable media " can comprise and can store or any medium of transmission information.The example of machine readable media comprises electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc.Code segment can be downloaded via the computer network such as internet, Intranet etc.
The present invention can realize with other concrete form, and do not break away from its spirit and substantive characteristics.For example, the algorithm described in specific embodiment can be modified, and system architecture does not break away from essence spirit of the present invention.Therefore, current embodiment is counted as exemplary but not determinate in all respects, scope of the present invention is by claims but not foregoing description definition, and, thereby the whole changes that fall in the scope of the implication of claim and equivalent all are included among scope of the present invention.
Claims (13)
1. method for generation of stereo 3 D image, described method comprises:
The pre-processing of the information step is for the treatment of 3D world data, described 3D world data be transformed in 1.0 * 1.0 * 1.0 regular space and store in the fixed-point number mode; And
Execution in step be used for to be used the pretreated 3D world data of storing, and produces in real time the right and left eyes image, and produces stereo 3 D image by superimposed described right and left eyes image.
2. the method for claim 1, wherein described pre-processing of the information step comprises:
All 3D objects in the scanning 3D world are with definite minimum envelop border;
Determine that an optimal fixed point counts expression formula, this expression formula has the optimal approximation accuracy of the original floating number of simulation;
Described 3D world data is transformed in described regular space, to produce normalized 3D world data; And
Count the described normalized 3D of expression formula storage world data according to described optimal fixed point.
3. the method for claim 1, wherein described execution in step comprises:
All 3D objects in the described 3D of the real time scan world;
According to the described normalized 3D world data of storing, with each 3D Coordinate Conversion of each 3D object to the 2D screen coordinate;
According to the depth capacity of all screen coordinate points, calculate the maximum horizontal deviant of viewport;
According to the degree of depth of each screen coordinate point, calculate the horizontal-shift value of this screen coordinate point;
According to the maximum horizontal deviant of described viewport and the horizontal-shift value of each screen coordinate point, produce left-eye images and right-eye image; And
Described left-eye images and described right-eye image are superimposed on single screen, to form described stereo 3 D image.
4. method as claimed in claim 3, wherein, described left-eye images and described right-eye image are respectively red, blue pixels.
5. method as claimed in claim 3, wherein, the horizontal-shift value of each screen coordinate point is calculated as follows:
offseti＝(depthi-focusi)/(32767-focusi)×offset_maxi，
Wherein, offseti is the horizontal-shift value of this screen coordinate point, and depthi is the depth value of this screen coordinate point, and offset_maxi is the maximum horizontal deviant, and focusi represents the depth value of focus, above-mentioned everyly all represent with fixed-point number.
6. method as claimed in claim 5, wherein, described depth value is between 0.0-1.0, be expressed as between 0-32767 with fixed-point number, and be divided into 64 intervals, horizontal-shift value ratio (depthi-focusi)/(32767-focusi) is pre-calculated and is the look-up table according to the interval index of 64 depth values, and
Described pre-processing of the information step also comprises:
Set up and store described look-up table,
The step of calculating the horizontal-shift value of each screen coordinate point in described execution in step comprises:
According to the described look-up table of depth value search of this screen coordinate point, to find corresponding horizontal-shift value ratio.
7. device for generation of stereo 3 D image, described device comprises:
The pre-processing of the information device is for the treatment of 3D world data, described 3D world data be transformed in 1.0 * 1.0 * 1.0 regular space and store in the fixed-point number mode; And
Final controlling element be used for to use the pretreated 3D world data of storing, and produces in real time the right and left eyes image, and produces stereo 3 D image by superimposed described right and left eyes image.
8. device as claimed in claim 7, wherein, described pre-processing of the information device comprises:
Scanning element is for all 3D objects in the scanning 3D world, with definite minimum envelop border;
Optimal fixed point is counted the expression formula computing unit, is used for a definite optimal fixed point and counts expression formula, and this expression formula has the optimal approximation accuracy of the original floating number of simulation;
The normalization unit is used for described 3D world data is transformed into described regular space, to produce normalized 3D world data; And
Memory cell is used for counting the expression formula described normalized 3D of storage world data according to described optimal fixed point.
9. device as claimed in claim 7, wherein, described final controlling element comprises:
The real time scan unit is for all 3D objects in the described 3D of the real time scan world;
Coordinate transformation unit is used for according to the described normalized 3D world data of storing, with each 3D Coordinate Conversion of each 3D object to the 2D screen coordinate;
The first computing unit is used for the depth capacity according to all screen coordinate points, calculates the maximum horizontal deviant of viewport;
The second computing unit is used for the degree of depth according to each screen coordinate point, calculates the horizontal-shift value of this screen coordinate point;
Right and left eyes image generation unit is used for according to the maximum horizontal deviant of described viewport and the horizontal-shift value of each screen coordinate point, produces left-eye images and right-eye image; And
Superimposed unit is used for described left-eye images and described right-eye image are superimposed on single screen, to form described stereo 3 D image.
10. device as claimed in claim 9, wherein, described the second computing unit utilizes following formula to calculate the horizontal-shift value of each screen coordinate point:
offseti＝(depthi-focusi)/(32767-focusi)×offset_maxi，
Wherein, offseti is the horizontal-shift value of this screen coordinate point, and depthi is the depth value of this screen coordinate point, and offset_maxi is the maximum horizontal deviant, and focusi represents the depth value of focus, above-mentioned everyly all represent with fixed-point number.
11. device as claimed in claim 10, wherein, described depth value is between 0.0-1.0, be expressed as between 0-32767 with fixed-point number, and be divided into 64 intervals, horizontal-shift value ratio (depthi-focusi)/(32767-focusi) is pre-calculated and is the look-up table according to the interval index of 64 depth values, and
Described pre-processing of the information device also comprises:
Look-up table is set up the unit, is used for setting up described look-up table,
This look-up table also is stored in described memory cell,
Described the second computing unit in described final controlling element utilizes the described look-up table of depth value search of each screen coordinate point, to find corresponding horizontal-shift value ratio.
12. a terminal equipment that produces stereo 3 D image, described terminal equipment comprises:
The device for generation of stereo 3 D image as described in any one in claim 5-7.
13. terminal equipment as claimed in claim 12, wherein, described terminal equipment is resource-constrained devices, and this resource-constrained devices does not have Graphics Processing Unit GPU and only supports the fixed-point number computing.
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| CN111314686A (en) * | 2020-03-20 | 2020-06-19 | 深圳市博盛医疗科技有限公司 | Method, system and medium for automatically optimizing 3D (three-dimensional) stereoscopic impression |
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| CN111314686A (en) * | 2020-03-20 | 2020-06-19 | 深圳市博盛医疗科技有限公司 | Method, system and medium for automatically optimizing 3D (three-dimensional) stereoscopic impression |
| CN111314686B (en) * | 2020-03-20 | 2021-06-25 | 深圳市博盛医疗科技有限公司 | Method, system and medium for automatically optimizing 3D (three-dimensional) stereoscopic impression |
| WO2021184533A1 (en) * | 2020-03-20 | 2021-09-23 | 深圳市博盛医疗科技有限公司 | Method and system for automatically optimizing 3d stereoscopic perception, and medium |
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Application publication date: 20130619 |