CN106331439B - Microlens array imaging device and imaging method - Google Patents
Microlens array imaging device and imaging method Download PDFInfo
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- CN106331439B CN106331439B CN201510404756.7A CN201510404756A CN106331439B CN 106331439 B CN106331439 B CN 106331439B CN 201510404756 A CN201510404756 A CN 201510404756A CN 106331439 B CN106331439 B CN 106331439B
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Abstract
The present invention provides a kind of microlens array imaging devices, it includes main lens, microlens array and the image acquisition units far from the main lens side positioned at microlens array, the microlens array includes the sub-lens of multiple array arrangements, it is characterized in that, the imaging optical path of the microlens array is using the diaphragm of the main lens as field stop；The main lens is to the first image formed by object between the main lens and the microlens array, and the first image after each sub-lens on described image acquisition unit at second image, each second image includes a rectangular base map and the rectangular disperse outer ring around the rectangular base map.The microlens array imaging device can guarantee adjacent sub-lens at the second picture material do not occur interference aliasing, and the image of high-resolution can be obtained, the image restoring of realization theory original resolution ratio.The present invention further comprises a kind of microlens array imaging method.
Description
Technical field
The present invention relates to technical field of imaging, in particular to a kind of microlens array imaging device and imaging method.
Background technique
Consumer-elcetronics devices at present, industrial detection equipment etc. is all gradually intended to portability, lightening.Generally, in order to
It realizes flexible image-acquisition functions and passes through frequently with schemes such as poly-lens groups, in this way, the lightening of device is limited,
Portability.
Microlens array is widely used in light-field camera, compound eye camera and wide-field micro- camera, needs to micro-
Lens array imaging carries out subsequent processing, and such as each lenticule imaging is matched or spliced.However, due to light
Fluctuation, the dark phenomenon of intermediate bright surrounding can occur in the imaging of each lenticule, serious as causing so as to cause treated
Interference, meanwhile, the splicing of later image or it is matched during, image resolution ratio utilization rate is lower, causes resolution ratio
Waste.
Summary of the invention
In order in the thickness that image device is effectively reduced while obtain the image of high-resolution, the present invention proposes one kind
Microlens array imaging device comprising main lens, microlens array and the separate main lens positioned at microlens array
The image acquisition units of side, the microlens array include the sub-lens of multiple array arrangements, which is characterized in that described micro-
The imaging optical path of lens array is using the diaphragm of the main lens as field stop；The main lens is to the first image formed by object
Between the main lens and the microlens array, and the first image is adopted after each sub-lens in described image
Collect on unit into second image, each second image includes rectangular base map and around the rectangular base map
Rectangular disperse outer ring.
Further, the rectangular base map of each second image and second image adjacent thereto is described
The distance between rectangular base map be more than or equal to zero, and be less than or equal to second image the rectangular disperse outer ring width and
The sum of the width of the rectangular disperse outer ring of second image adjacent thereto.
Further, second image includes efficacious prescriptions shape disperse outer ring, and the effectively rectangular disperse outer ring is greater than etc.
In rectangular base map, and it is less than rectangular disperse outer ring.
Further, the institute of effective rectangular disperse outer ring of second image and second image adjacent thereto
Rectangular disperse outer ring is stated to connect.
Further, the main lens is round lens, and the main lens is provided with rectangular diaphragm.
Further, the main lens square-lens.
Further, the rectangular base map is the chief ray coverage area of diaphragm picture in image acquisition units；It is described rectangular
Disperse outer ring is the disperse light coverage of diaphragm picture in image acquisition units.
Further, the size shape of the multiple sub-lens is identical.
Further, the microlens array imaging device further comprises an image processing unit, at described image
Reason unit is for splicing the second image formed by the multiple sub-lens.
Further, the second image of each sub-lens includes effective rectangular disperse outer ring of interception, described to have
Efficacious prescriptions shape disperse outer ring is more than or equal to rectangular base map, and is less than rectangular disperse outer ring.
Further, the institute of the rectangular base map of each second image and second image adjacent thereto
The width that the distance between rectangular base map is more than or equal to the effectively rectangular disperse outer ring is stated, and is less than or equal to second image
The effectively width of rectangular disperse outer ring and second image adjacent thereto the effectively rectangular disperse outer ring
The sum of width.
The present invention also proposes that a kind of microlens array imaging method, the microlens array imaging method include following step
It is rapid:
By main lens to object at the first image；And
The first image is by each sub-lens of microlens array at second image, each second figure
As including a rectangular base map and the rectangular disperse outer ring around the rectangular base map, the side of each second image
The distance between shape base map and the rectangular base map of second image adjacent thereto are more than or equal to zero, and are less than or equal to institute
State the rectangular disperse outer ring of width second image adjacent thereto of the rectangular disperse outer ring of the second image
The sum of width.
Further, effective square region of second image is intercepted, effective square region includes described rectangular
Base map and effective rectangular disperse outer ring；The effectively rectangular disperse outer ring is more than or equal to rectangular base map, and is less than outside rectangular disperse
Ring.
Further, the institute of effective rectangular disperse outer ring of second image and second image adjacent thereto
Rectangular disperse outer ring is stated to connect.
It further, further comprise splicing to the second image formed by the multiple sub-lens.
Further, the size shape of the multiple sub-lens is identical；And each second image is described rectangular
The distance between base map and the rectangular base map of second image adjacent thereto are more than or equal to the effectively rectangular disperse
The width of outer ring, and it is less than or equal to the effectively width of rectangular disperse outer ring of second image and adjacent thereto described
The sum of the width of the effectively rectangular disperse outer ring of second image.
Detailed description of the invention
Fig. 1 is the structural block diagram for the microlens array imaging device that first embodiment of the invention provides；
Fig. 2 is the index path for the microlens array imaging device that invention first embodiment provides；
Fig. 3 is the dispersion model figure of the microlens array in Fig. 2；
Fig. 4 is the schematic diagram of a sub-lens formed second image in image acquisition units in Fig. 2；
Fig. 5 is the effective coverage schematic diagram of a sub-lens formed second image in image acquisition units in Fig. 2；
Fig. 6 is the first schematic diagram when image processing unit splices the second image of each sub-lens；
Fig. 7 is the second schematic diagram when image processing unit splices the second image of each sub-lens；
Fig. 8 is to be supplied to the original chart that microlens array imaging device is imaged in Fig. 1；
Fig. 9-Figure 12 is schematic diagram of the microlens array imaging device that provides of Fig. 1 to the original graph table imaging joint of Fig. 8；
Figure 13 is the flow chart for the microlens array imaging method that second embodiment of the invention provides.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, the present invention is not limited to following public specific realities
Apply the limitation of example.
Referring to Figure 1, Fig. 2 and Fig. 3, a kind of microlens array imaging device comprising main lens 120, microlens array
130 and the image acquisition units 150 positioned at 120 side of separate main lens of microlens array 130.In the present embodiment, main
Lens 120 and microlens array 130 make the optical lens group 140 of microlens array imaging device.
Microlens array 130 includes the sub-lens 131 of multiple array arrangements.In the present embodiment, multiple sub-lens 131
Size shape is identical.It is understood that in other embodiments, the size shape of multiple sub-lens 131 can not also be identical,
It can according to need setting.
As shown in Figure 2,3, main lens 120 is located at main lens 120 and lenticule to the first image 121 formed by object 110
Between array 130, meanwhile, object of first image 121 as microlens array 130；First image 121 is after each sub-lens
At second image 181 in image acquisition units 150.The effective aperture diaphragm of microlens array imaging device is main lens
120 aperture diaphragm 122, using the aperture diaphragm 122 of main lens 120 as visual field light in the imaging optical path of each sub-lens 131
Door screen, in the present embodiment, main lens 120 are round lens, and main lens 120 is provided with rectangular diaphragm.It is understood that
In other embodiments, main lens 120 is square-lens.
Please also refer to Fig. 4, each second image 181 is including a square base Figure 182 and around square base Figure 182's
Rectangular disperse outer ring 183；
Wherein square base Figure 182 is the chief ray coverage area of diaphragm picture in image acquisition units 150, width b；This
Square base Figure 182 of embodiment is square, and width b is the side length of rectangular base map；
Disperse light coverage of the rectangular disperse outer ring 183 for diaphragm picture in image acquisition units 150, width c,
And it is symmetrical along chief ray；Rectangular disperse outer ring 183 includes an interior frame and an outer rim, and width c is for interior frame and outside
Width between frame.
Second image 181 is the chief ray of diaphragm picture and the coverage area of disperse light in image acquisition units 150, wide
Degree is b+2c, it defines effective viewing field's range of each sub-lens 131, and disperse part distribution situation is by main lens diaphragm
122 and 131 aperture shape of sub-lens codetermine.
Each sub-lens 131 image in resulting first image 121 of main lens 120 in image acquisition units 150 respectively,
By the transformation twice of lens, upright picture is finally obtained.Therefore, mirror image processing need to be only done when last image procossing just can restore
Starting material.Wherein, object 110 is imaged in main lens 120, and each sub-lens 131 are again imaged real image formed by main lens 120,
And main lens diaphragm 122 is imaged in each sub-lens 131, Gauss image-forming principle is deferred to, when device is placed in air dielectric
When, object-image relation such as formula (1) is to shown in formula (3):
In above-mentioned formula, u1Indicate the object distance that main lens 120 is imaged, v1Indicate the image distance that main lens 120 is imaged, f1It indicates
The focal length of main lens 120；u2Indicate the object distance that microlens array 130 is imaged, v2Indicate the image distance that microlens array 130 is imaged, i.e.,
The spacing of image acquisition units 150 and microlens array 130, f2Indicate the focal length of microlens array 130；U indicates main lens 120
Aperture diaphragm 122 with a distance from microlens array 130, v indicates microlens array 130 to the aperture diaphragm 122 of main lens 120
The image distance of imaging.
Between square base Figure 182 of each second image 181 and square base Figure 182 of the second image 181 adjacent thereto
Distance be more than or equal to zero, and be less than or equal to the second image 181 rectangular disperse outer ring 183 width and adjacent thereto second
The sum of the width of the rectangular disperse outer ring 183 of image 181.
Due to needing to splice each sub-lens image to restore complete image when later image is handled,
Must assure that when shooting image adjacent sub-lens 131 in image acquisition units 150 at 181 content of the second image do not occur
Interfere aliasing.
In the present embodiment, as shown in figure 5, the second image 181 can be intercepted according to the size of required image resolution ratio
Effective square region, including square base Figure 182 and effective rectangular disperse outer ring 184, wherein the value of effectively rectangular disperse outer ring 184
With the size of the rectangular disperse outer ring 183 of infinite approach, can may make final spliced map resolution ratio can infinite approach original image, but need
Guarantee that the content in adjacent intercepted efficacious prescriptions shape disperse outer ring 184 does not occur interference aliasing.In this optical model, bottom is intercepted
Graph parameter k, as shown in formula (4):
Its value range can be 0≤k < 1.
In above-mentioned formula, c1Indicate that (effective rectangular disperse outer ring 184 includes in one to effectively rectangular 184 width of disperse outer ring
Frame and an outer rim, width c1Width between interior frame and outer rim), c indicates the width of rectangular disperse outer ring 183
Degree.When k takes 0, the base map range of interception is the range of chief ray covering, i.e. square base Figure 182；When k takes 1, the bottom of interception
Figure range is the range of disperse light covering, i.e., whole disperses all utilize, and resolution ratio is full resolution also original image at this time.It can root
The factually needs of border picture quality and resolution ratio set a suitable k value, to realize the image of high-resolution and high quality.
Due to being finally to splice each adjacent 131 imaging of sub-lens to restore the image of actual photographed, and be
Second image 181 of image acquisition units 150 is maximumlly utilized, that is, reaches the resolution ratio of image after splicing most
Greatly.The present embodiment proposes the optical texture that rectangular disperse outer ring 183 and rectangular disperse outer ring 183 adjacent thereto connect, and keeps away
The content exempted from the effective rectangular disperse part intercepted overlaps, and causes picture material chaotic, so that guarantee two is adjacent
Rectangular disperse outer ring between will not interfere with each other and aliasing, the second image using image acquisition units 150 of maximal efficiency
181。
In the present embodiment, microlens array imaging device further comprises image processing unit 160, image processing unit
For the second image 181 formed by multiple sub-lens 131 to be spliced.
Refer to Fig. 6, effective squared region of the image processing unit 160 to the second image 181 formed by multiple sub-lens 131
When domain is spliced, spliced by the way of multiple second images 181 of movement.Due to base map to be spliced be it is rectangular, because
The repetitive rate minimum of content in this adjacent effective square region can be 0, i.e., effective rectangular disperse of each second image 181
Effective rectangular disperse outer ring 184 of outer ring 184 and the second image 181 adjacent thereto connects.
Fig. 7 is referred to, the present invention also provides a kind of case study on implementation, and the content in effective square region can be allowed to partly overlap,
Image Adjusting when in favor of later image splicing, adjacent prismatic base map overlaps after splicing at this time, but does not influence image
Integrality, at this point, the rectangular base map of square base Figure 182 of each second image 181 and the second image 181 adjacent thereto
The distance between 182 are more than or equal to the width c of effective rectangular disperse outer ring 1841, and it is effective rectangular less than the second image 181
The width c of disperse outer ring1With the width c of effective rectangular disperse outer ring 184 of the second image 181 adjacent thereto1The sum of.
Please also refer to Fig. 8-Figure 12, what microlens array imaging device was imaged and was spliced to original chart shows
Be intended to, it follows that microlens array imaging device can guarantee adjacent sub-lens in image acquisition units 150 at second
181 content of image does not occur interference aliasing, and can effectively utilize the pixel unit in image acquisition units 150.Work as image
Processing unit 160 is when carrying out mobile splicing to the second image 181, effective rectangular disperse outer ring 184 of each second image 181
Connect with effective rectangular disperse outer ring 184 of the second image 181 adjacent thereto, at this point, spliced image resolution ratio is maximum.
Microlens array imaging device can guarantee adjacent sub-lens 131 in image acquisition units 150 at the second figure
As 181 contents do not occur interference aliasing, and the pixel unit in image acquisition units 150 can be effectively utilized.
Referring to Figure 13, a kind of microlens array imaging method that second embodiment of the invention provides comprising following step
It is rapid:
Step 21: by main lens to object at the first image.
Step 22: the first image is by each sub-lens of microlens array at second image, each second figure
As include a rectangular base map and the rectangular disperse outer ring around rectangular base map, the rectangular base map of each second image and and its
The distance between adjacent rectangular base map of the second image is more than or equal to zero, and is less than or equal to the rectangular disperse outer ring of the second image
Width the second image adjacent thereto rectangular disperse outer ring the sum of width.
Step 23: effective square region of the second image of interception, effective square region include rectangular base map and have efficacious prescriptions
Shape disperse outer ring；Effective rectangular disperse outer ring is more than or equal to rectangular base map, and is less than or equal to rectangular disperse outer ring.The present embodiment
In, effective rectangular disperse outer ring of the second image and the rectangular disperse outer ring of the second image adjacent thereto connect.
Step 24: effective square region of the second image formed by multiple sub-lens is spliced.To multiple sub-lens
Formed second image is by the way of mobile splicing.In the present embodiment, effective rectangular disperse outer ring of each second image
Connect with effective rectangular disperse outer ring of the second image adjacent thereto.
Microlens array imaging method can guarantee adjacent sub-lens in image acquisition units 150 at the second image in
Appearance does not occur interference aliasing, and can effectively utilize the pixel unit in image acquisition units.
The above is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (16)
1. a kind of microlens array imaging device comprising main lens, microlens array and positioned at the separate of microlens array
The image acquisition units of the main lens side, the microlens array include the sub-lens of multiple array arrangements, and feature exists
In the imaging optical path of the microlens array is using the diaphragm of the main lens as field stop；The main lens is to object institute
At the first image between the main lens and the microlens array, and the first image is after each sub-lens
At second image on described image acquisition unit, each second image is including a rectangular base map and surrounds institute
State the rectangular disperse outer ring of rectangular base map.
2. microlens array imaging device according to claim 1, which is characterized in that each second image it is described
The distance between rectangular base map and the rectangular base map of second image adjacent thereto are more than or equal to zero, and are less than or equal to
Outside the rectangular disperse of the width and second image adjacent thereto of the rectangular disperse outer ring of second image
The sum of width of ring；
Wherein, the rectangular disperse outer ring is the disperse light coverage of diaphragm picture in image acquisition units, and along chief ray
It is symmetrical；The rectangular disperse outer ring includes an interior frame and an outer rim, and the width of the rectangular disperse outer ring is that this is interior
Width between frame and the outer rim.
3. microlens array imaging device according to claim 1, which is characterized in that second image includes surrounding institute
State effective rectangular disperse outer ring of rectangular base map, the face for the square region that the outer rim of the effectively rectangular disperse outer ring is surrounded
Product is more than or equal to the area of rectangular base map, and the area of the square region surrounded less than the outer rim of rectangular disperse outer ring.
4. microlens array imaging device according to claim 3, which is characterized in that the rectangular disperse outer ring and and its
Adjacent rectangular disperse outer ring connects.
5. microlens array imaging device according to claim 1, which is characterized in that the main lens is round lens,
The main lens is provided with rectangular diaphragm.
6. microlens array imaging device according to claim 1, which is characterized in that the main lens is square-lens.
7. microlens array imaging device according to claim 1, which is characterized in that the rectangular base map is Image Acquisition
The chief ray coverage area of diaphragm picture on unit；The rectangular disperse outer ring is the disperse light of diaphragm picture in image acquisition units
Coverage area.
8. microlens array imaging device according to claim 1, which is characterized in that the size shape of the multiple sub-lens
Shape is identical.
9. microlens array imaging device according to claim 1, which is characterized in that the microlens array imaging device
It further comprise an image processing unit, described image processing unit is used for the second image formed by the multiple sub-lens
Spliced.
10. microlens array imaging device according to claim 9, which is characterized in that the second of each sub-lens
Image includes effective rectangular disperse outer ring around the rectangular base map interception, the outer rim institute of the effectively rectangular disperse outer ring
The area of the square region surrounded is more than or equal to the area of rectangular base map, and surrounded less than the outer rim of rectangular disperse outer ring
The area of square region.
11. microlens array imaging device according to claim 10, which is characterized in that the institute of each second image
Stating the distance between rectangular base map and the rectangular base map of second image adjacent thereto has efficacious prescriptions more than or equal to described
The width of shape disperse outer ring, and it is less than the effectively width of rectangular disperse outer ring and the institute adjacent thereto of second image
State the sum of the width of the effectively rectangular disperse outer ring of the second image；
The effectively rectangular disperse outer ring includes an interior frame and an outer rim, and the width of the effectively rectangular disperse outer ring is should
Width between interior frame and the outer rim.
12. a kind of microlens array imaging method, which is characterized in that the microlens array imaging method includes the following steps:
By main lens to object at the first image；And
The first image is by each sub-lens of microlens array at second image, each second image packet
Include a rectangular base map and the rectangular disperse outer ring around the rectangular base map, the square base of each second image
The distance between figure and described rectangular base map of second image adjacent thereto are more than or equal to zero, and are less than or equal to described the
The width of the rectangular disperse outer ring of the width of the rectangular disperse outer ring of two images second image adjacent thereto
The sum of；
Wherein, the rectangular disperse outer ring is the disperse light coverage of diaphragm picture in image acquisition units, and along chief ray
It is symmetrical；The rectangular disperse outer ring includes an interior frame and an outer rim, and the width of the rectangular disperse outer ring is that this is interior
Width between frame and the outer rim.
13. microlens array imaging method according to claim 12, which is characterized in that intercept having for second image
Square region is imitated, effective square region includes the rectangular base map and outside effective rectangular disperse of the rectangular base map
Ring；The area for the square region that the outer rim of the effectively rectangular disperse outer ring is surrounded is more than or equal to the area of rectangular base map,
And the area of the square region surrounded less than the outer rim of rectangular disperse outer ring.
14. microlens array imaging method according to claim 13, which is characterized in that the rectangular disperse outer ring and with
Its adjacent rectangular disperse outer ring connects.
15. microlens array imaging method according to claim 12, which is characterized in that further comprise saturating to multiple sons
Second image formed by mirror is spliced.
16. microlens array imaging method according to claim 15, which is characterized in that the size of the multiple sub-lens
Shape is identical；And the square base of the rectangular base map of each second image and second image adjacent thereto
The distance between figure is more than or equal to the width of effective rectangular disperse outer ring, and has efficacious prescriptions less than or equal to the described of second image
The sum of the width of the effectively rectangular disperse outer ring of the width of shape disperse outer ring and second image adjacent thereto；
The effectively rectangular disperse outer ring includes an interior frame and an outer rim, and the width of the effectively rectangular disperse outer ring is should
Width between interior frame and the outer rim.
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| KR102680385B1 (en) | 2019-10-30 | 2024-07-02 | 삼성전자주식회사 | Multi-lens image restoration device and method |
| CN114636385B (en) * | 2020-12-15 | 2023-04-28 | 奕目(上海)科技有限公司 | Three-dimensional imaging method and system based on light field camera and three-dimensional imaging measurement production line |
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| TW200506418A (en) * | 2003-07-01 | 2005-02-16 | Nippon Sheet Glass Co Ltd | Lens plate, its manufacturing method, and image transmitting apparatus |
| JP2010181686A (en) * | 2009-02-06 | 2010-08-19 | Oki Data Corp | Lens array, led head, exposure device, image forming apparatus and reading device |
| CN102510449B (en) * | 2011-11-18 | 2015-06-10 | 北京理工大学 | Human eye-like image sensor based on non-uniform lens array |
| US8988538B2 (en) * | 2012-07-02 | 2015-03-24 | Canon Kabushiki Kaisha | Image pickup apparatus and lens apparatus |
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Granted publication date: 20191025 |