CN105282401A - Image acquisition device and shading compensation method thereof - Google Patents
Image acquisition device and shading compensation method thereof Download PDFInfo
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- CN105282401A CN105282401A CN201410263496.1A CN201410263496A CN105282401A CN 105282401 A CN105282401 A CN 105282401A CN 201410263496 A CN201410263496 A CN 201410263496A CN 105282401 A CN105282401 A CN 105282401A
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Abstract
An image acquisition device and a shading compensation method thereof are provided. The shading compensation method is applicable to an image acquisition device which is provided with a main lens, an auxiliary lens and a diffusion sheet. A main lens and auxiliary lens corresponding table associated with the main lens and the auxiliary lens and an auxiliary lens and diffusion sheet corresponding table associated with the auxiliary lens and the diffusion sheet are pre-stored in the image acquisition device. The shading compensation method comprises the steps as follows: first, using the diffusion sheet to cover the auxiliary lens, and using the main lens and the auxiliary lens covered by the diffusion sheet to acquire the images of a scene at the same time so as to provide a main image and a diffused image; using the main lens and auxiliary lens corresponding table and the auxiliary lens and diffusion sheet corresponding table to establish a shading compensation table corresponding to the scene according to the main image and the diffused image; and carrying out shading compensation of the main image according to the shading compensation table to generate a compensated image.
Description
Technical field
The present invention relates to a kind of video capturing device, particularly relate to a kind of video capturing device and dark angle compensation method thereof.
Background technology
Along with the development of science and technology, digital camera and intelligent camera cell phone have become the medium of modern as record Life intravenous drip.Therefore, how to make above-mentioned video capturing device provide the function of more hommizations, become the important topic of Ge great manufacturer.
General video capturing device utilizes charge coupled cell (Charge-coupleddevice, CCD) or the photo-sensitive cell such as complementary metal oxide layer semiconductor (ComplementaryMetal-OxideSemiconductor, CMOS) catch the light entered by camera lens in fuselage.When light is by lens set, refraction can be produced and then image is presented on photo-sensitive cell.But, because light refraction can cause the decay of energy, and the refraction angle that can produce than the light through center of lens through the refraction angle that the light of lens edge produces is large, therefore can produce the phenomenon that image edge region is comparatively dark and central area is brighter, it is called " dark angle " (shading) or " halation " (vignetting) in photography with optical field.This kind of phenomenon easily causes the inharmonious of image frame, also can have influence on the visual effect of user.
The existing dark angle compensation calculation method overwhelming majority is applicable to single-lens camera, and it is the mechanism using single or multiple look-up table interpolations, can be wherein fix one or more the most frequently used light sources in order to set up the parameter of look-up table.The image problem of the different-colours such as image corner is excessively dark although the above-mentioned mechanism of tabling look-up can be revised, colour cast, must according to different light sources adjustment interpolated parameter or adjustment look-up table.But the change of Different Light frequency spectrum is violent, interpolated parameter be adjusted and then look-up table is met the degree of difficulty of likely light source quite high.In addition, if take pictures under unknown light source or the scene of composite light source, then the problem at dark angle still cannot solve.
Summary of the invention
In view of this, the invention provides a kind of video capturing device and dark angle compensation method thereof, it utilizes shooting environment light source information instantly come immediately and set up dark angle compensation information adaptively, to carry out dark angle compensation process to captured image, thus obtains the image of better quality.
The present invention proposes a kind of dark angle compensation method of video capturing device, be applicable to the video capturing device with main lens, secondary mirror head and diffusion sheet, wherein video capturing device prestores and is associated with the main lens secondary mirror head diffusion sheet corresponding table of showing and be associated with secondary mirror head and diffusion sheet corresponding to the major-minor camera lens of secondary mirror head.This dark angle compensation method comprises the following steps.First, diffusion sheet is utilized to cover secondary mirror head.Then, utilize main lens and be diffused the secondary mirror head that sheet covers, obtain the image of a scene simultaneously, to produce main image and diffusion image respectively.According to main image and diffusion image, utilize major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table, set up the dark angle compensation table corresponding to above-mentioned scene.Afterwards, according to dark angle compensation table, dark angle compensation process is carried out to main image, to produce compensation image.
In one embodiment of this invention, utilizing before diffusion sheet covers the step of secondary mirror head, above-mentioned dark angle compensation method also comprises the following steps.Main lens and secondary mirror head is utilized to obtain the image of a light source, to produce main testing image and secondary testing image respectively.Utilize diffusion sheet to cover this secondary mirror head, and utilize and be diffused the image that secondary mirror head that sheet covers obtains above-mentioned light source, to produce diffusion testing image.According to main testing image and secondary testing image, set up major-minor camera lens correspondence table, and according to secondary testing image and diffusion testing image, set up secondary mirror head diffusion sheet correspondence table.
In one embodiment of this invention, above-mentioned according to main testing image and secondary testing image, set up major-minor camera lens correspondence table, and according to secondary testing image and diffusion testing image, the step setting up secondary mirror head diffusion sheet correspondence table comprises: calculate multiple first ratio according to main testing image and secondary testing image, and utilizes described first ratio to set up major-minor camera lens correspondence table; Calculate multiple second ratio according to secondary testing image and diffusion testing image, and utilize described second ratio to set up secondary mirror head diffusion sheet correspondence table.Wherein, each described first ratio is each pixel in main testing image and the ratio between the pixel in secondary testing image with same pixel coordinate, and each described second ratio is each pixel in secondary testing image and is spreading the ratio between the pixel in testing image with same pixel coordinate.
In one embodiment of this invention, above-mentioned according to main image and diffusion image, utilize major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table, the step setting up the dark angle compensation table corresponding to above-mentioned scene comprises: according to diffusion image, utilize described first ratio in major-minor camera lens correspondence table and described second ratio in secondary mirror head diffusion sheet correspondence table, obtain the main image of simulation; According to the main image of simulation and main image, calculate multiple penalty coefficient; And utilize described penalty coefficient, set up dark angle compensation table.
In one embodiment of this invention, the dark angle compensation table of above-mentioned basis, dark angle compensation process is carried out to main image, compensates the step of image comprise to produce: according to the pixel value of each pixel in each described penalty coefficient of dark angle compensation table and main image, produce and compensate image.
In one embodiment of this invention, according to dark angle compensation table, dark angle compensation process is carried out to main image, with produce compensate image step after, above-mentioned dark angle compensation method also comprises the following steps.When judging that above-mentioned scene does not change, main lens is utilized to obtain the image of above-mentioned scene, to produce new main image.According to dark angle compensation table, dark angle compensation process is carried out to new main image, newly compensates image to produce.
The present invention separately proposes a kind of video capturing device, comprise main lens, secondary mirror head, diffusion sheet, storage element and one or more processing unit, wherein diffusion sheet is connected to secondary mirror head, and described processing unit couples main lens, secondary mirror head, diffusion sheet and storage element.Storage element is in order to record multiple module and to be associated with the main lens secondary mirror head diffusion sheet corresponding table of showing and be associated with secondary mirror head and diffusion sheet corresponding to the major-minor camera lens of secondary mirror head.Processing unit is in order to access and to perform the described module recorded in storage element, and wherein said module comprises and covers module, image capturing module, builds table module and dark angle compensation module.Covering module utilizes diffusion sheet to cover secondary mirror head.Image capturing module utilizes main lens and is diffused the secondary mirror head that sheet covers, and obtains the image of a scene simultaneously, to produce main image and diffusion image respectively.Build table module according to main image and diffusion image, utilize major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table, set up the dark angle compensation table corresponding to above-mentioned scene.Dark angle compensation module, according to dark angle compensation table, carries out dark angle compensation process to main image, to produce compensation image.
In one embodiment of this invention, above-mentioned video capturing device is also coupled to image processor.Image capturing module first utilizes main lens and secondary mirror head to obtain the image of a light source, to produce main testing image and secondary testing image respectively.Covering module utilizes diffusion sheet to cover secondary mirror head, and utilizes and be diffused the image that secondary mirror head that sheet covers obtains above-mentioned light source, to produce diffusion testing image.Image processor, according to main testing image and secondary testing image, sets up major-minor camera lens correspondence table, and according to secondary testing image and diffusion testing image, sets up secondary mirror head diffusion sheet correspondence table.
In one embodiment of this invention, above-mentioned image processor calculates multiple first ratio according to main testing image and secondary testing image, and utilize described first ratio to set up major-minor camera lens correspondence table, calculate multiple second ratio according to secondary testing image and diffusion testing image again, and utilize described second ratio to set up secondary mirror head diffusion sheet correspondence table.Wherein, each described first ratio is each pixel in main testing image and the ratio between the pixel in secondary testing image with same pixel coordinate, and each described second ratio is each pixel in secondary testing image and is spreading the ratio between the pixel in testing image with same pixel coordinate.
In one embodiment of this invention, above-mentioned builds table module according to diffusion image, utilize described first ratio in major-minor camera lens correspondence table and described second ratio in secondary mirror head diffusion sheet correspondence table, obtain the main image of simulation, again according to the main image of simulation and main image, calculate multiple penalty coefficient; And utilize described penalty coefficient, set up dark angle compensation table.
In one embodiment of this invention, above-mentioned dark angle compensation module, according to the pixel value of each pixel in each described penalty coefficient of dark angle compensation table and main image, produces and compensates image.
In one embodiment of this invention, above-mentioned video capturing device also comprises judgement module.When judging that module judges that above-mentioned scene does not change, main lens is utilized to obtain the image of above-mentioned scene, to produce new main image.According to dark angle compensation table, dark angle compensation process is carried out to new main image, newly compensates image to produce.
Based on above-mentioned, video capturing device proposed by the invention and dark angle compensation method thereof, when the product line production phase of video capturing device, in the diffusion sheet that the configuration of secondary mirror head front is portable, and store major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table in advance.When the stage of taking pictures of video capturing device, diffusion sheet can be utilized to be covered by secondary mirror head, make the image accessed by secondary mirror head close to equally distributed light source, recycling major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table, by the dark angle compensation information of photographed scene can be obtained after real-time operation, thus dark angle compensation is carried out to the image accessed by main lens.Video capturing device proposed by the invention and dark angle compensation method thereof can while filmed images, obtain the environment light source information of photographed scene, therefore do not need in advance producing the dark angle compensation table of line production phase foundation corresponding to Different Light, to save storage space.In addition, obtain the dark angle compensation table of unknown light source compared to the existing mode with adjustment, the present invention utilizes shooting environment light source information instantly come immediately and set up dark angle compensation table adaptively, thus obtains the compensation image of better quality.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the block diagram of the video capturing device according to one embodiment of the invention.
The flow chart of the dark angle compensation method that Fig. 2 is the video capturing device according to one embodiment of the invention.
The use schematic diagram that Fig. 3 a and Fig. 3 b is the video capturing device according to one embodiment of the invention.
The function block schematic diagram of the dark angle compensation method that Fig. 4 is the video capturing device according to one embodiment of the invention.
Reference numeral:
100: video capturing device
10a: main lens
10b: secondary mirror head
15: diffusion sheet
20: storage element
30: processing unit
122: cover module
124: image capturing module
126: build table module
128: dark angle compensation module
S202 ~ S208: the flow process of the dark angle compensation method of video capturing device
401: main testing image
402: secondary testing image
403: diffusion testing image
422: image at present
430: compensate image
410: produce the line production phase
420: user takes pictures the stage
412: major-minor camera lens correspondence table
414: secondary mirror head diffusion sheet correspondence table
424: dark angle compensation table
426: dark angle compensation process
Embodiment
Concept of the present invention is that the twin-lens of video capturing device is when producing the line production phase, at the diffusion sheet that the configuration of secondary mirror head front is portable.When video capturing device is obtaining image to a certain scene and when needing dark angle compensation information, diffusion sheet can be utilized to be covered by secondary mirror head, make the image accessed by secondary mirror head close to equally distributed light source, the dark angle compensation information of this scene can be obtained after real-time operation, thus dark angle compensation is carried out to the image accessed by main lens.
Next section Example of the present invention will coordinate accompanying drawing to describe in detail, the component symbol that following description is quoted, when different accompanying drawing occurs that identical component symbol will be considered as same or analogous element.These embodiments are a part of the present invention, do not disclose all embodiments of the present invention.More precisely, these embodiments are the example of the apparatus and method in patent claim of the present invention.
Fig. 1 is the block diagram of the video capturing device according to one embodiment of the invention, but this is only for convenience of description, not in order to limit the present invention.First Fig. 1 first introduces all components and the configuration relation of video capturing device, and cooperation Fig. 2 discloses by detailed functions in the lump.
Please refer to Fig. 1, video capturing device 100 comprises main lens 10a, secondary mirror head 10b, diffusion sheet 15, storage element 20 and one or more processing unit 30.In the present embodiment, video capturing device 100 is such as digital camera, S.L.R, digital code camera or other have the electronic installation such as intelligent mobile phone, panel computer, personal digital assistant of image capturing function, and the present invention is not as limit.
Main lens 10a and secondary mirror head 10b comprises photo-sensitive cell, in order to sense the light intensity entering main lens 10a and secondary mirror head 10b respectively, and then produces image respectively.Described photo-sensitive cell is such as charge coupled cell (ChargeCoupledDevice, CCD), Complimentary Metal-Oxide semiconductor (ComplementaryMetal-OxideSemiconductor, CMOS) element or other elements, the present invention does not limit at this.
Diffusion sheet 15 is connected to secondary mirror head 10b, configurable in the front of secondary mirror head 10b, in order to cover secondary mirror head 10b at video capturing device 100, to perform the program of dark angle compensation.Diffusion sheet 15 is mainly by optical design special on the surface, and the angle of adjustment light injection and direction, allow light evenly disperse.When secondary mirror head 10b be diffused sheet 15 cover time, the image obtained will be the image of a brightness uniformity.In the present embodiment, diffusion sheet 15 is frosted glass (groundglass), and in other embodiments, diffusion sheet 15 can also be the blooming piece that glassine paper etc. can make uniform light scattering.
Storage element 20 is such as the fixed of any pattern or packaged type random access memory (RandomAccessMemory, RAM), the combination of read-only memory (Read-OnlyMemory, ROM), flash memory (Flashmemory), hard disk or other similar devices or these devices.Storage element 20 is in order to record multiple modules that can be performed by processing unit 30, and these modules can be loaded into processing unit 30, carry out dark angle compensation function with the image produced video capturing device 100.
Processing unit 30 can be such as CPU (CentralProcessingUnit, CPU), or microprocessor (Microprocessor), the digital signal processor (DigitalSignalProcessor of other programmable general services or special purpose, DSP), Programmable Logic Controller, Application Specific Integrated Circuit (ApplicationSpecificIntegratedCircuits, ASIC), the combination of programmable logic device (ProgrammableLogicDevice, PLD) or other similar devices or these devices.Processing unit 30 couples main lens 10a, secondary mirror head 10b, diffusion sheet 15 and storage element 20, and it can access and the module of executive logging in storage element 20, carries out dark angle compensation function with the image produced video capturing device 100.
Above-mentioned module comprise cover module 122, image capturing module 124, build table module 126 and compensate module 128, it can be loaded into processing unit 30, thus performs the function of dark angle compensation.Below namely enumerate embodiment and the detailed step performing dark angle compensation method for video capturing device 100 is described.
The dark angle compensation method flow diagram that Fig. 2 is the video capturing device according to one embodiment of the invention, and the dark angle compensation method of the video capturing device of Fig. 2 can each element of video capturing device 100 of Fig. 1 realize.
Referring to Fig. 1 and Fig. 2, first, the module 122 that covers of video capturing device 100 utilizes diffusion sheet 15 to cover secondary mirror head 10b (step S202), and image capturing module 124 utilizes main lens 10a and is diffused the secondary mirror head 10b that sheet 15 covers, obtain the image of a scene, to produce main image and diffusion image (step S204) respectively simultaneously.In detail, when user is for utilizing video capturing device 100 to take the image of described scene, covers module 122 and can first utilize diffusion sheet 15 to cover secondary mirror head 10b.Then, image capturing module 124 will obtain the image of above-mentioned scene, and produce corresponding to the main image of main lens 10a and corresponding to the diffusion image being diffused the secondary mirror head 10b that sheet 15 covers.
At the image that the content of this main image is above-mentioned scene, but due to the limiting factor of camera lens itself, the main image that therefore main lens 10a obtains has the comparatively dark and dark angle phenomenon that central area is brighter of fringe region.On the other hand, due to the image that diffusion image obtains for the secondary mirror head 10b being diffused sheet 15 and covering, along with the difference of the environment light source of described scene, the content of diffusion image is the image that complete white or full ash etc. has uniform luminance.Video capturing device 100 is the environment light source information obtaining described scene according to diffusion image, to obtain the dark angle compensation information corresponding to above-mentioned scene at subsequent step.
What must first illustrate is, video capturing device 100 is before dispatching from the factory, major-minor camera lens correspondence table and the corresponding table of secondary mirror head diffusion sheet first can be pre-stored in the storage element 20 of video capturing device 100, corresponding relation wherein between the same image of major-minor camera lens correspondence table for main lens 10a and secondary mirror head 10b taken by, secondary mirror head diffusion sheet correspondence table is diffused the corresponding relation between the same image that sheet 15 covers taken by front and back for secondary mirror head 10b.
Specifically, Fig. 3 a and Fig. 3 b use schematic diagram that is the video capturing device according to one embodiment of the invention.
When producing the line production phase, as shown in Figure 3 a, the image capturing module 124 of video capturing device 100, by utilizing main lens 10a and secondary mirror head 10b by the image of acquisition one light source, to produce main testing image and secondary testing image respectively, is shown to set up major-minor camera lens correspondence.In the present embodiment, this light source can be lamp box, and the content of main testing image and secondary testing image will be the white image that fringe region is comparatively dark and central area is brighter.Be easily to pick out dark angle in image and dimmed with degree that is colour cast at this image obtaining light source as the benefit of the content of main testing image and secondary testing image, to set up according to the difference between main testing image with secondary testing image, major-minor camera lens is corresponding to be shown, and the characteristic that the difference wherein between two images is mainly main lens and the mechanism of secondary mirror head own caused.
On the other hand, equally when producing the line production phase, as shown in Figure 3 b, covering the recycling diffusion sheet 15 of module 122 and covering secondary mirror head 10b, and image capturing module 124 utilizes the image being diffused the secondary mirror head 10b acquisition same light source that sheet 15 covers, to produce diffusion testing image.Compared to secondary testing image, the content of diffusion testing image is the white image of brightness uniformity, and the difference between the diffusion testing image that the secondary testing image that can produce according to the secondary mirror head 10b before covering again afterwards and the secondary mirror head 10b after covering produce sets up secondary mirror head diffusion sheet correspondence table.
Accordingly, video capturing device 100 is when producing the line production phase, and will be connected to image processor, this image processor can be the electronic installation with image processing and calculation function.Main testing image, secondary testing image and diffusion testing image can be transferred to image processor by video capturing device 100.Image processor calculates multiple first ratio by according to the pixel of main training image and the pixel of secondary training image, and utilizes described first ratio to set up major-minor camera lens correspondence table.Be main training image and secondary ratio of training between the pixel in image with same pixel coordinate at this each first ratio, with represent video capturing device 100 utilize main lens 10a and secondary mirror head 10b corresponding relation between two images obtaining out.
Similarly, image processor calculates multiple second ratio according to the pixel of pair training image and diffusion testing image again, and utilizes described second ratio to set up secondary mirror head diffusion sheet correspondence table.Be main training image and secondary ratio of training between the pixel in image with same pixel coordinate at this each second ratio, with represent the secondary mirror head 10b of video capturing device 100 before utilizing crested and after crested corresponding relation between two images obtaining out.Image processor transmits it to the storage element 20 of video capturing device 100 after having set up major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table.
Fig. 2 please be return, when user takes pictures the stage, after the image capturing module 124 of video capturing device 100 produces main image and diffusion image, building table module 126 will according to main image and diffusion image, utilize major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table, set up the dark angle compensation table (step S206) corresponding to aforementioned scene.In detail, spread image and can represent photographed scene environment light source information instantly.Building table module 126 can according to diffusion image, releasing numerical value for compensating needed for the main image gone out captured by above-mentioned scene or multiplying power by the major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table that are pre-stored in storage element 20 are anti-, being defined herein as " penalty coefficient " (compensationcoefficient).
In the present embodiment, build table module 126 and first according to diffusion image, the first ratio in the corresponding table of major-minor camera lens and the second ratio in secondary mirror head diffusion sheet correspondence table can be utilized, the main image of anti-release one simulation.Then, build table module 126 and calculate multiple penalty coefficient according to the main image of simulation and the actual main image obtained of main lens 10a again.In the present embodiment, each penalty coefficient can have a same pixel coordinate for the main image of simulation and main image pixel between ratio.But, in other embodiments, build table module 126 and first can also obtain ratio between pixel that the main image of simulation and main image have a same pixel coordinate, recycling model joins modes such as suitable (modelfitting) to revise described ratio, and being compensated coefficient, the present invention does not limit at this.Build table module 126 after calculating described penalty coefficient, set up dark angle compensation table according to the pixel coordinate corresponding to each penalty coefficient.
Then, compensate module 128 according to dark angle compensation table, dark angle compensation process is carried out to main image, compensate image (step S208) to produce.In detail, compensate module 128 according to the pixel value of each pixel in main image and pixel coordinate, corresponding penalty coefficient to be inquired about in dark angle compensation table, then carry out dark angle compensation process, to produce compensation image according to penalty coefficient each pixel to main image.For example, suppose that penalty coefficient is the convergent-divergent multiplying power of pixel value, compensating module 128 when carrying out dark angle compensation process to main image, each pixel value of main image can be multiplied by the convergent-divergent multiplying power corresponding to it, compensation image can be produced.
It should be noted that above-mentioned dark angle compensation table for obtain according to video capturing device 100 special scenes instantly instant construction form.Therefore, as long as obtain image under the scene with same light source, dark angle compensation table then need not construction again.In one embodiment, video capturing device 100 also comprises and judges module (not shown), after execution of step S208, when video capturing device 100 will obtain image again, judges that module can judge whether environment light source changes.For example, judge that module can utilize the white balance of video capturing device 100 (whitebalance) to set and judge whether environment light source changes.In one embodiment, when judging that module judges that environment light source does not change, namely the photographed scene representing this is identical with previous photographed scene, therefore covering module 122 can not utilize diffusion sheet to cover secondary mirror head 10b, compensating module 128 can directly according to same dark angle compensation table, directly dark angle compensation process is carried out to the new main image that main lens obtains, newly compensate image to produce.
The functional-block diagram that the dark angle compensation method of aforementioned video capturing device can utilize Fig. 4 to disclose shown by an embodiment according to this is summed up.
Please refer to Fig. 4, the method can first utilize main testing image 401 and secondary testing image 402 to set up the corresponding table 412 of major-minor camera lens in the product line production phase 410, utilizes again secondary testing image 402 and diffusion testing image 403 to set up the corresponding table 414 of secondary mirror head diffusion sheet.Before video capturing device 100 dispatches from the factory, the corresponding table 412 of major-minor camera lens and the corresponding table 414 of secondary mirror head diffusion sheet will be pre-stored in storage element 20.User take pictures the stage 420 time, when user utilizes image capturing module 100 to take a scene, after getting at image capturing module 100 the current image 422 comprising main image and diffusion image, the dark angle compensation table 424 of this scene will be corresponded to according to the corresponding table 412 of major-minor camera lens, the corresponding table 414 of secondary mirror head diffusion sheet and image 422 generation at present, and according to dark angle compensation table 424, dark angle compensation process 426 is carried out to the main image in current image 422, compensate image 430 to export.
In sum, video capturing device proposed by the invention and dark angle compensation method thereof, when the product line production phase of video capturing device, in the diffusion sheet that the configuration of secondary mirror head front is portable, and store major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table in advance.When the stage of taking pictures of video capturing device, diffusion sheet can be utilized to be covered by secondary mirror head, make the image accessed by secondary mirror head close to equally distributed light source, recycling major-minor camera lens correspondence table and secondary mirror head diffusion sheet correspondence table, by the dark angle compensation information of photographed scene can be obtained after real-time operation, thus dark angle compensation is carried out to the image accessed by main lens.Video capturing device proposed by the invention and dark angle compensation method thereof can while filmed images, obtain the environment light source information of photographed scene, therefore do not need in advance producing the dark angle compensation table of line production phase foundation corresponding to Different Light, to save storage space.In addition, obtain the dark angle compensation table of unknown light source compared to the existing mode with adjustment, the present invention utilizes shooting environment light source information instantly come immediately and set up dark angle compensation table adaptively, thus obtains the compensation image of better quality.
Although the present invention with embodiment disclose as above, so itself and be not used to limit the present invention, the those of ordinary skill in any art, when doing a little change and retouching, and does not depart from the spirit and scope of the present invention.
Claims (12)
1. the dark angle compensation method of a video capturing device, it is characterized in that, be applicable to the video capturing device with main lens, secondary mirror head and diffusion sheet, wherein this video capturing device prestores and is associated with this main lens secondary mirror head diffusion sheet corresponding table of showing and being associated with this secondary mirror head and this diffusion sheet corresponding to the major-minor camera lens of this secondary mirror head, and this dark angle compensation method comprises:
This diffusion sheet is utilized to cover this secondary mirror head;
Utilize this main lens and this secondary mirror head of covering by this diffusion sheet, obtain the image of scene, to produce main image and diffusion image respectively simultaneously;
According to this main image and this diffusion image, utilize this major-minor camera lens correspondence table and this secondary mirror head diffusion sheet correspondence table, set up the dark angle compensation table corresponding to this scene; And
According to this dark angle compensation table, dark angle compensation process is carried out to this main image, to produce compensation image.
2. dark angle compensation method according to claim 1, is characterized in that, utilizing before this diffusion sheet covers the step of this secondary mirror head, this dark angle compensation method also comprises:
This main lens and this secondary mirror head is utilized to obtain the image of light source, to produce main testing image and secondary testing image respectively;
Utilize this diffusion sheet to cover this secondary mirror head, and utilize this secondary mirror head of covering by this diffusion sheet obtain the image of this light source, to produce diffusion testing image; And
According to this main testing image and this secondary testing image, set up this major-minor camera lens correspondence table, and according to this secondary testing image and this diffusion testing image, set up this secondary mirror head diffusion sheet correspondence table.
3. dark angle compensation method according to claim 2, it is characterized in that, according to this main testing image and this secondary testing image, set up this major-minor camera lens correspondence table, and according to this secondary testing image and this diffusion testing image, the step setting up this secondary mirror head diffusion sheet correspondence table comprises:
Multiple first ratio is calculated according to this main testing image and this secondary testing image, and utilize described first ratio to set up this major-minor camera lens correspondence table, wherein each described first ratio is each pixel in this main testing image and the ratio between the pixel in this secondary testing image with same pixel coordinate; And
Multiple second ratio is calculated according to this secondary testing image and this diffusion testing image, and utilize described second ratio to set up this secondary mirror head diffusion sheet correspondence table, wherein each described second ratio is each pixel in this secondary testing image and the ratio between the pixel in this diffusion testing image with same pixel coordinate.
4. dark angle compensation method according to claim 3, is characterized in that, according to this main image and this diffusion image, utilize this major-minor camera lens correspondence table and this secondary mirror head diffusion sheet correspondence table, the step setting up this dark angle compensation table corresponding to this scene comprises:
According to this diffusion image, utilize described first ratio in this major-minor camera lens correspondence table and described second ratio in this secondary mirror head diffusion sheet correspondence table, obtain the main image of simulation;
According to the main image of this simulation and this main image, calculate multiple penalty coefficient; And
Utilize described penalty coefficient, set up this dark angle compensation table.
5. dark angle compensation method according to claim 4, is characterized in that, according to this dark angle compensation table, carries out dark angle compensation process, comprise with the step producing this compensation image this main image:
According to the pixel value of each pixel in each described penalty coefficient of this dark angle compensation table and this main image, produce this compensation image.
6. dark angle compensation method according to claim 1, is characterized in that, according to this dark angle compensation table, carries out dark angle compensation process to this main image, and after the step producing this compensation image, this dark angle compensation method also comprises:
When judging that this scene does not change, this main lens is utilized to obtain the image of this scene, to produce new main image;
According to this dark angle compensation table, dark angle compensation process is carried out to this new main image, newly compensates image to produce.
7. a video capturing device, is characterized in that, comprising:
Main lens;
Secondary mirror head;
Diffusion sheet, is connected to this secondary mirror head;
Storage element, records multiple module and is associated with this main lens secondary mirror head diffusion sheet corresponding table of showing and being associated with this secondary mirror head and this diffusion sheet corresponding to the major-minor camera lens of this secondary mirror head; And
One or more processing unit, couples this main lens, this secondary mirror head, this diffusion sheet and this storage element, and to access and to perform in this storage element the described module recorded, described module comprises:
Cover module, utilize this diffusion sheet to cover this secondary mirror head;
Image capturing module, utilize this main lens and this secondary mirror head of covering by this diffusion sheet, obtain the image of scene, to produce main image and diffusion image respectively simultaneously;
Build table module, according to this main image and this diffusion image, utilize this major-minor camera lens correspondence table and this secondary mirror head diffusion sheet correspondence table, set up the dark angle compensation table corresponding to this scene; And
Dark angle compensation module, according to this dark angle compensation table, carries out dark angle compensation process to this main image, to produce compensation image.
8. video capturing device according to claim 7, is characterized in that, this video capturing device is also coupled to image processor, wherein:
This image capturing module utilizes this main lens and this secondary mirror head to obtain the image of light source, to produce main testing image and secondary testing image respectively;
This covers module and utilizes this diffusion sheet to cover this secondary mirror head, and utilize this secondary mirror head of covering by this diffusion sheet obtain the image of this light source, to produce diffusion testing image; And
This image processor, according to this main testing image and this secondary testing image, sets up this major-minor camera lens correspondence table, and according to this secondary testing image and this diffusion testing image, sets up this secondary mirror head diffusion sheet correspondence table.
9. video capturing device according to claim 8, is characterized in that:
This image processor calculates multiple first ratio according to this main testing image and this secondary testing image, and utilize described first ratio to set up this major-minor camera lens correspondence table, wherein each described first ratio is each pixel in this main testing image and the ratio between the pixel in this secondary testing image with same pixel coordinate; And
This image processor calculates multiple second ratio according to this secondary testing image and this diffusion testing image, and utilize described second ratio to set up this secondary mirror head diffusion sheet correspondence table, wherein each described second ratio is each pixel in this secondary testing image and the ratio between the pixel in this diffusion testing image with same pixel coordinate.
10. video capturing device according to claim 9, is characterized in that:
This builds table module according to this diffusion image, utilizes described first ratio in this major-minor camera lens correspondence table and described second ratio in this secondary mirror head diffusion sheet correspondence table, obtains the main image of simulation;
This builds table module according to the main image of this simulation and this main image, calculates multiple penalty coefficient; And
This is built table module and utilizes described penalty coefficient, sets up this dark angle compensation table.
11. video capturing devices according to claim 10, is characterized in that, this dark angle compensation module, according to the pixel value of each pixel in each described penalty coefficient of this dark angle compensation table and this main image, produces this compensation image.
12. video capturing devices according to claim 11, is characterized in that, also comprise:
Judge module, when judging that this scene does not change, this judgement module utilizes this main lens to obtain the image of this scene, to produce new main image, and this dark angle compensation module is according to this dark angle compensation table, dark angle compensation process is carried out to this new main image, newly compensates image to produce.
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