CN107682646A - The quick light-dimming method in HDR spatial domain and system based on DMD - Google Patents
The quick light-dimming method in HDR spatial domain and system based on DMD Download PDFInfo
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- CN107682646A CN107682646A CN201710914671.2A CN201710914671A CN107682646A CN 107682646 A CN107682646 A CN 107682646A CN 201710914671 A CN201710914671 A CN 201710914671A CN 107682646 A CN107682646 A CN 107682646A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/57—Control of the dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
Abstract
The invention discloses a kind of quick light-dimming method in HDR spatial domain and system based on DMD, it is related to high dynamic range imaging field.This method comprises the following steps：According to DMD display bit wide, the light modulation weights of N number of fixation are preset, dimming state mark flag=1 is preset, sets maximum gray threshold；Pixel in imaging sensor is grouped, the sub- mask images in each packet is initialized, sub- mask images is loaded into DMD；Perform light modulation acquisition step：High dynamic scene is imaged, obtains the image after corresponding dim；The image after light modulation with reference to corresponding to final mask images and its, carries out high dynamic scene recovery, generates high dynamic scene image.The present invention can be rapidly completed the light modulation imaging to HDR scene.
Description
Technical field
The present invention relates to high dynamic range imaging field, and it is fast to be specifically related to a kind of HDR spatial domain based on DMD
Velocity modulation light method and system.
Background technology
High dynamic range imaging technology is the focus of Recent study.Based on DMD (Digital Micromirror
Device, DMD) high dynamic range imaging technology, by the use of DMD as additional space optical modulator, passed with image
Sensor is combined, and carries out high dynamic scene observation, can effectively improve the detectable dynamic range of imaging system.
DMD is a kind of fast digital photoswitch reflective array being integrated in addressing integrated chip, by many small-sized aluminium
Mirror surface processed is formed, and its display resolution determines the quantity of eyeglass, the corresponding pixel of an eyeglass.Micro mirror up to a million
It is built in hinge on CMOS memory, there is a pair of addressing electrodes and sram cell CMOS electricity below under each micro mirror unit
The voltage complementary end on road is connected by conductive channel.
DMD has two kinds of stable states (+12 ° and -12 °), and system, can by addressing voltage corresponding to changing each micro mirror
Individually to control the upset of micro mirror.When DMD is irradiated by light source, the positive and negative binary states of micromirror is anti-with two kinds of angles by incident light
Penetrate.
High dynamic light modulation imaging system of the in general based on DMD is made up of DMD and image acquiring sensor
Optical system.The pixel that each DMD micro mirror unit in system corresponds on imaging sensor, they are one a pair
It should be related to.Define DMD two states be respectively：" ON " and " OFF ", when DMD micro mirrors are under " ON " state, micro mirror is by incidence
Light is reflexed on image acquiring sensor, referred to as " on state of " of image；When DMD micro mirrors are under " OFF " state, micro mirror is by incidence
Light is reflexed in absorption plant, referred to as " dark-state " of image.By control DMD micro mirrors within a frame period in " ON " and
The time of " OFF " state, it is possible to achieve the intensity modulation of the pixel corresponding to DMD, DMD are shown within this frame period
Image is mask images, and the DMD micro mirror units in imaging sensor corresponding to pixel are in a frame time in " ON " state
Ratio is the light modulation weights of the pixel.
Current most light-dimming method is all to load single tune every time using the mask images of single light modulation weights, system
The mask images of light weights, and its corresponding scene image is obtained, after image of the multi collect scene under different light modulation weights,
High dynamic scene recovery is carried out to the image collected, so as to obtain high-dynamics image.Light modulation speed be present in current light-dimming method
Spend the defects of slow.
The content of the invention
The invention aims to overcome the shortcomings of above-mentioned background technology, there is provided a kind of HDR based on DMD
The quick light-dimming method in spatial domain and system, the light modulation imaging to HDR scene can be rapidly completed.
The present invention provides a kind of quick light-dimming method in HDR spatial domain based on DMD, comprises the following steps：
S1, the display bit wide according to DMD DMD, preset the light modulation weights r of N number of fixationn, N is 4 integer
Times, n=1,2 ..., N, 0 ＜ r1＜ rn＜ rN=1；
Default dimming state mark flag=1, represent that light modulation has been completed；
The maximum gray threshold gray for the image that setting imaging sensor collects, expression can carry out follow-up high dynamic field
The maximum image gray value that scape recovers；
S2, the pixel in imaging sensor is grouped, every four adjacent pixels are divided into four in one group, same group
Individual pixel assigns different light modulation weights respectively, and one group of light modulation weights corresponding to one group of pixel are sub- mask images；
The sub- mask images in each packet are initialized, are initialized as the light modulation weights R of the sub- mask images of each groupWherein, a=N, b=N-1, c=N-2, d=N-3, sub- mask images are loaded into DMD；
S3, perform light modulation acquisition step：High dynamic scene is imaged, obtains the image after corresponding dim；
If the gray value of four pixels in a packet is above maximum gray threshold gray, change in the packet
The light modulation weights of sub- mask images, sub- mask R four subscripts for dimming weights are calculated, a=a-4, b=b-4, c=
C-4, d=d-4, load new light modulation weightsIf now d ≠ 1, flag=0 is made, otherwise makes flag
=1；
If four pixels in a packet have the pixel that gray value is less than maximum gray threshold gray, gray scale is selected
Light modulation weights r of the value closest to maximum gray scale thresholding gray pixels, should as the final light modulation weights of four points of the group
Organizing the light modulation weights corresponding to final sub- mask images isThe new light modulation weights life according to corresponding to each group
The mask images new into a width；
S4, flag is judged, if flag=0, represent not completing whole dimming process, it is necessary to further carry out light intensity
Modulation, makes flag=1, re-executes step S3；
If flag=1, represent that dimming process terminates, mask images now are final mask images r (x, y), make DMD
Load the mask images and collect the image f (x, y) after final light modulation, terminate light modulation acquisition step；
Image f (x, y) after S5, the light modulation with reference to final mask images r (x, y) and corresponding to it, carry out high dynamic
Scene is recovered, generation high dynamic scene image g (x, y).
On the basis of above-mentioned technical proposal, in step S1, the rNThe maximum dimmer weights of expression system, its value are
1, now DMD " ON " state is always maintained within a frame period, system does not decay to the light intensity of scene；r1Expression system
Minimum light modulation weights, it represents maximum attenuation ability of the system to light intensity, and its size is determined by DMD display bit wide.
On the basis of above-mentioned technical proposal, when the display bit wide of the DMD is d positions,
On the basis of above-mentioned technical proposal, the r1And rNBetween insertion N-2 light modulation weights, these dim weights expire
It is enough lower constraint：ri+1=2 × ri, i ∈ [1, N).
On the basis of above-mentioned technical proposal, in step S5, the high dynamic scene image g (x, y) is according to below equation
It is calculated：
The present invention also provides a kind of quick light adjusting system in HDR spatial domain based on DMD, and it is pre- that the system includes parameter
If unit, initialization unit, light modulation collecting unit, judging unit, high dynamic scene image generation unit, wherein：
The parameter is preset unit and is used for：According to DMD DMD display bit wide, the light modulation of N number of fixation is preset
Weights rn, N be 4 integral multiple, n=1,2 ..., N, 0 ＜ r1＜ rn＜ rN=1；
Default dimming state mark flag=1, represent that light modulation has been completed；
The maximum gray threshold gray for the image that setting imaging sensor collects, expression can carry out follow-up high dynamic field
The maximum image gray value that scape recovers；
The initialization unit is used for：Pixel in imaging sensor is grouped, every four adjacent pixels are divided into
Four pixels in one group, same group assign different light modulation weights respectively, and one group of light modulation weights corresponding to one group of pixel are
Sub- mask images；
The sub- mask images in each packet are initialized, are initialized as the light modulation weights R of the sub- mask images of each groupWherein, a=N, b=N-1, c=N-2, d=N-3, sub- mask images are loaded into DMD；
The light modulation collecting unit is used to perform light modulation acquisition step：High dynamic scene is imaged, corresponding to acquisition
Image after light modulation；
If the gray value of four pixels in a packet is above maximum gray threshold gray, change in the packet
The light modulation weights of sub- mask images, sub- mask R four subscripts for dimming weights are calculated, a=a-4, b=b-4, c=
C-4, d=d-4, load new light modulation weightsIf now d ≠ 1, flag=0 is made, otherwise makes flag
=1；
If four pixels in a packet have the pixel that gray value is less than maximum gray threshold gray, gray scale is selected
Light modulation weights r of the value closest to maximum gray threshold gray pixels, should as the final light modulation weights of four points of the group
Organizing the light modulation weights corresponding to final sub- mask images isThe new light modulation weights life according to corresponding to each group
The mask images new into a width；
The judging unit is used for：Flag is judged, if flag=0, represent do not complete whole dimming process, it is necessary to
Intensity modulation is further carried out, makes flag=1, instruction light modulation collecting unit works on, and performs light modulation acquisition step；
If flag=1, represent that dimming process terminates, mask images now are final mask images r (x, y), make DMD
Load the mask images and collect the image f (x, y) after final light modulation, terminate light modulation acquisition step；
The high dynamic scene image generation unit is used for：With reference to final mask images r (x, y) and the tune corresponding to it
Image f (x, y) after light, carry out high dynamic scene recovery, generation high dynamic scene image g (x, y).
On the basis of above-mentioned technical proposal, the rNThe maximum dimmer weights of expression system, its value are 1, now DMD
" ON " state is always maintained within a frame period, system does not decay to the light intensity of scene；r1The minimum light modulation of expression system
Weights, it represents maximum attenuation ability of the system to light intensity, and its size is determined by DMD display bit wide.
On the basis of above-mentioned technical proposal, when the display bit wide of the DMD is d positions,
On the basis of above-mentioned technical proposal, the r1And rNBetween insertion N-2 light modulation weights, these dim weights expire
It is enough lower constraint：ri+1=2 × ri, i ∈ [1, N).
On the basis of above-mentioned technical proposal, the high dynamic scene image g (x, y) is calculated according to below equation：
Compared with prior art, advantages of the present invention is as follows：
The present invention presets the light modulation weights of N number of fixation, presets dimming state mark flag=according to DMD display bit wide
1, the maximum gray threshold gray for the image that setting imaging sensor collects, expression can carry out follow-up high dynamic scene and recover
Maximum image gray value；Pixel in imaging sensor is grouped, the sub- mask images in each packet are initialized, by son
Mask images are loaded into DMD；
Perform light modulation acquisition step：High dynamic scene is imaged, obtains the image after corresponding dim；If one point
The gray value of four pixels in group is above maximum gray threshold gray, then changes the light modulation of the sub- mask images in the packet
Sub- mask R four subscripts for dimming weights are calculated, a=a-4, b=b-4, c=c-4, d=d-4 by weights, and loading is new
Light modulation weightsIf now d ≠ 1, flag=0 is made, otherwise makes flag=1；
If four pixels in a packet have the pixel that gray value is less than maximum gray threshold gray, gray scale is selected
Value, should as the final light modulation weights of four points of the group closest to the light modulation weights rs of maximum gray threshold gray pixel
Organizing the light modulation weights corresponding to final sub- mask images isThe new light modulation weights life according to corresponding to each group
The mask images new into a width；
Flag is judged, if flag=0, represents not completing whole dimming process, it is necessary to further carry out light intensity tune
System, makes flag=1, re-executes light modulation acquisition step；
If flag=1, represent that dimming process terminates, mask images now are final mask images r (x, y), make DMD
Load the mask images and collect the image f (x, y) after final light modulation, terminate light modulation acquisition step；
The image after light modulation with reference to corresponding to final mask images and its, carries out high dynamic scene recovery, and generation is high
Dynamic scene image.
The present invention using four adjacent pixels as an imaging unit, assigned every time in dimming process 4 it is different
Weights are dimmed, so as to accelerate the light modulation speed of high dynamic scene.In the worst case, it is only necessary toSecondary light modulation, you can complete
Into whole dimming process.Compared with traditional light-dimming method, the present invention can effectively improve light modulation speed.
Brief description of the drawings
Fig. 1 is the flow chart of the quick light-dimming method in HDR spatial domain based on DMD in the embodiment of the present invention.
Fig. 2 is the pixel packet schematic diagram in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.
Shown in Figure 1, the embodiment of the present invention provides a kind of quick light-dimming method in HDR spatial domain based on DMD,
Comprise the following steps：
S1, the display bit wide according to DMD DMD, preset the light modulation weights r of N number of fixationn, N is 4 integer
Times, n=1,2 ..., N, 0 ＜ r1＜ rn＜ rN=1；
rNThe maximum dimmer weights of expression system, its value are 1, and now DMD is always maintained at " ON " within a frame period
State, system do not decay to the light intensity of scene；
r1The minimum light modulation weights of expression system, it represents system to the maximum attenuation ability of light intensity, and its size is by DMD
Display bit wide determine；
When DMD display bit wide is d positions,
r1And rNBetween N-2 light modulation weights of insertion, these light modulation weights meet following constraint：ri+1=2 × riI ∈ [1,
N)；
Default dimming state mark flag=1, represent that light modulation has been completed；
The maximum gray threshold gray for the image that setting imaging sensor collects, expression can carry out follow-up high dynamic field
The maximum image gray value that scape recovers；
S2, the pixel in imaging sensor is grouped, shown in Figure 2, every four adjacent pixels are divided into one group,
Four pixels in same group assign different light modulation weights respectively, and one group of light modulation weights corresponding to one group of pixel are sub- mask
Image；
The sub- mask images in each packet are initialized, are initialized as the light modulation weights R of the sub- mask images of each groupWherein, a=N, b=N-1, c=N-2, d=N-3, sub- mask images are loaded into DMD；
S3, perform light modulation acquisition step：High dynamic scene is imaged, obtains the image after corresponding dim；
If the gray value of four pixels in a packet is above maximum gray threshold gray, change in the packet
The light modulation weights of sub- mask images, sub- mask R four subscripts for dimming weights are calculated, a=a-4, b=b-4, c=
C-4, d=d-4, load new light modulation weightsIf now d ≠ 1, flag=0 is made, otherwise makes flag
=1；
If four pixels in a packet have the pixel that gray value is less than maximum gray threshold gray, gray scale is selected
Light modulation weights r of the value closest to maximum gray threshold gray pixels, should as the final light modulation weights of four points of the group
Organizing the light modulation weights corresponding to final sub- mask images isThe new light modulation weights life according to corresponding to each group
The mask images new into a width；
S4, flag is judged, if flag=0, represent not completing whole dimming process, it is necessary to further carry out light intensity
Modulation, makes flag=1, re-executes step S3；
If flag=1, represent that dimming process terminates, mask images now are final mask images r (x, y), make DMD
Load the mask images and collect the image f (x, y) after final light modulation, terminate light modulation acquisition step；
Image f (x, y) after S5, the light modulation with reference to final mask images r (x, y) and corresponding to it, carry out high dynamic
Scene is recovered, and generation high dynamic scene image g (x, y), high dynamic scene image g (x, y) are calculated according to below equation：
The embodiment of the present invention also provides a kind of quick light adjusting system in HDR spatial domain based on DMD, and the system includes
Parameter presets unit, initialization unit, light modulation collecting unit, judging unit, high dynamic scene image generation unit, wherein：
The parameter is preset unit and is used for：According to DMD DMD display bit wide, the light modulation of N number of fixation is preset
Weights rn, N be 4 integral multiple, n=1,2 ..., N, 0 ＜ r1＜ rn＜ rN=1；
rNThe maximum dimmer weights of expression system, its value are 1, and now DMD is always maintained at " ON " within a frame period
State, system do not decay to the light intensity of scene；r1The minimum light modulation weights of expression system, it represents maximum of the system to light intensity
Damping capacity, its size are determined by DMD display bit wide；
When DMD display bit wide is d positions,
r1And rNBetween N-2 light modulation weights of insertion, these light modulation weights meet following constraint：ri+1=2 × ri, i ∈ [1,
N)；
Default dimming state mark flag=1, represent that light modulation has been completed；
The maximum gray threshold gray for the image that setting imaging sensor collects, expression can carry out follow-up high dynamic field
The maximum image gray value that scape recovers；
The initialization unit is used for：Pixel in imaging sensor is grouped, shown in Figure 2, every four phases
Four pixels that adjacent pixel is divided into one group, same group assign different light modulation weights respectively, and one corresponding to one group of pixel
Group light modulation weights are sub- mask images；
The sub- mask images in each packet are initialized, are initialized as the light modulation weights R of the sub- mask images of each groupWherein, a=N, b=N-1, c=N-2, d=N-3, sub- mask images are loaded into DMD；
The light modulation collecting unit is used to perform light modulation acquisition step：High dynamic scene is imaged, corresponding to acquisition
Image after light modulation；
If the gray value of four pixels in a packet is above maximum gray threshold gray, change in the packet
The light modulation weights of sub- mask images, sub- mask R four subscripts for dimming weights are calculated, a=a-4, b=b-4, c=
C-4, d=d-4, load new light modulation weightsIf now d ≠ 1, flag=0 is made, otherwise makes flag
=1；
If four pixels in a packet have the pixel that gray value is less than maximum gray threshold gray, gray scale is selected
Light modulation weights r of the value closest to maximum gray threshold gray pixels, should as the final light modulation weights of four points of the group
Organizing the light modulation weights corresponding to final sub- mask images isThe new light modulation weights life according to corresponding to each group
The mask images new into a width；
The judging unit is used for：Flag is judged, if flag=0, represent do not complete whole dimming process, it is necessary to
Intensity modulation is further carried out, makes flag=1, instruction light modulation collecting unit works on, and performs light modulation acquisition step；
If flag=1, represent that dimming process terminates, mask images now are final mask images r (x, y), make DMD
Load the mask images and collect the image f (x, y) after final light modulation, terminate light modulation acquisition step；
The high dynamic scene image generation unit is used for：With reference to final mask images r (x, y) and the tune corresponding to it
Image f (x, y) after light, carry out high dynamic scene recovery, generation high dynamic scene image g (x, y), high dynamic scene image g
(x, y) is calculated according to below equation：
Those skilled in the art can carry out various modifications and variations to the embodiment of the present invention, if these modifications and change
Type is within the scope of the claims in the present invention and its equivalent technologies, then these modifications and variations are also in protection scope of the present invention
Within.
The prior art that the content not being described in detail in specification is known to the skilled person.
Claims (10)
1. a kind of quick light-dimming method in HDR spatial domain based on DMD, it is characterised in that comprise the following steps：
S1, the display bit wide according to DMD DMD, preset the light modulation weights r of N number of fixationn, N be 4 integral multiple, n=
1,2 ..., N, 0 ＜ r1＜ rn＜ rN=1；
Default dimming state mark flag=1, represent that light modulation has been completed；
The maximum gray threshold gray for the image that setting imaging sensor collects, it is extensive that expression can carry out follow-up high dynamic scene
Multiple maximum image gray value；
S2, the pixel in imaging sensor is grouped, every four adjacent pixels are divided into four pictures in one group, same group
Member assigns different light modulation weights respectively, and one group of light modulation weights corresponding to one group of pixel are sub- mask images；
The sub- mask images in each packet are initialized, are initialized as the light modulation weights R of the sub- mask images of each groupWherein, a=N, b=N-1, c=N-2, d=N-3, sub- mask images are loaded into DMD；
S3, perform light modulation acquisition step：High dynamic scene is imaged, obtains the image after corresponding dim；
If the gray value of four pixels in a packet is above maximum gray threshold gray, the son changed in the packet is covered
The light modulation weights of mould image, sub- mask R four subscripts for dimming weights are calculated, a=a-4, b=b-4, c=c-4, d
=d-4, load new light modulation weightsIf now d ≠ 1, flag=0 is made, otherwise makes flag=1；
If four pixels in a packet have the pixel that gray value is less than maximum gray threshold gray, gray value is selected most
Close to the light modulation weights r of maximum gray scale thresholding gray pixels, as the final light modulation weights of four points of the group, the group is most
Light modulation weights corresponding to whole sub- mask images areThe new light modulation weights generation one according to corresponding to each group
The new mask images of width；
S4, flag is judged, if flag=0, represent not completing whole dimming process, it is necessary to further carry out light intensity tune
System, makes flag=1, re-executes step S3；
If flag=1, represent that dimming process terminates, mask images now are final mask images r (x, y), make DMD load
The mask images collect the image f (x, y) after final light modulation, terminate light modulation acquisition step；
Image f (x, y) after S5, the light modulation with reference to final mask images r (x, y) and corresponding to it, carry out high dynamic scene
Recover, generation high dynamic scene image g (x, y).
2. the quick light-dimming method in HDR spatial domain based on DMD as claimed in claim 1, it is characterised in that：Step S1
In, the rNThe maximum dimmer weights of expression system, its value are 1, and now DMD is always maintained at " ON " shape within a frame period
State, system do not decay to the light intensity of scene；r1The minimum light modulation weights of expression system, its expression system decline to the maximum of light intensity
Subtract ability, its size is determined by DMD display bit wide.
3. the quick light-dimming method in HDR spatial domain based on DMD as claimed in claim 2, it is characterised in that：The DMD
Display bit wide when being d positions,
4. the quick light-dimming method in HDR spatial domain based on DMD as claimed in claim 1, it is characterised in that：The r1With
rNBetween N-2 light modulation weights of insertion, these light modulation weights meet following constraint：ri+1=2 × ri, i ∈ [1, N).
5. the quick light-dimming method in HDR spatial domain based on DMD as claimed in claim 1, it is characterised in that：Step S5
In, the high dynamic scene image g (x, y) is calculated according to below equation：
6. a kind of quick light adjusting system in HDR spatial domain based on DMD, it is characterised in that it is default single that the system includes parameter
Member, initialization unit, light modulation collecting unit, judging unit, high dynamic scene image generation unit, wherein：
The parameter is preset unit and is used for：According to DMD DMD display bit wide, the light modulation weights of default N number of fixation
rn, N be 4 integral multiple, n=1,2 ..., N, 0 ＜ r1＜ rn＜ rN=1；
Default dimming state mark flag=1, represent that light modulation has been completed；
The maximum gray threshold gray for the image that setting imaging sensor collects, it is extensive that expression can carry out follow-up high dynamic scene
Multiple maximum image gray value；
The initialization unit is used for：Pixel in imaging sensor is grouped, every four adjacent pixels are divided into one group,
Four pixels in same group assign different light modulation weights respectively, and one group of light modulation weights corresponding to one group of pixel are sub- mask
Image；
The sub- mask images in each packet are initialized, are initialized as the light modulation weights R of the sub- mask images of each groupWherein, a=N, b=N-1, c=N-2, d=N-3, sub- mask images are loaded into DMD；
The light modulation collecting unit is used to perform light modulation acquisition step：High dynamic scene is imaged, obtains corresponding dim
Image afterwards；
If the gray value of four pixels in a packet is above maximum gray threshold gray, the son changed in the packet is covered
The light modulation weights of mould image, sub- mask R four subscripts for dimming weights are calculated, a=a-4, b=b-4, c=c-4, d
=d-4, load new light modulation weightsIf now d ≠ 1, flag=0 is made, otherwise makes flag=1；
If four pixels in a packet have the pixel that gray value is less than maximum gray threshold gray, gray value is selected most
Close to the light modulation weights r of maximum gray threshold gray pixels, as the final light modulation weights of four points of the group, the group is most
Light modulation weights corresponding to whole sub- mask images areThe new light modulation weights generation one according to corresponding to each group
The new mask images of width；
The judging unit is used for：Flag is judged, if flag=0, represents not completing whole dimming process, it is necessary to enter one
Step carries out intensity modulation, makes flag=1, and instruction light modulation collecting unit works on, and performs light modulation acquisition step；
If flag=1, represent that dimming process terminates, mask images now are final mask images r (x, y), make DMD load
The mask images collect the image f (x, y) after final light modulation, terminate light modulation acquisition step；
The high dynamic scene image generation unit is used for：After light modulation with reference to final mask images r (x, y) and corresponding to it
Image f (x, y), carry out high dynamic scene recovery, generation high dynamic scene image g (x, y).
7. the quick light adjusting system in HDR spatial domain based on DMD as claimed in claim 6, it is characterised in that：The rNTable
Show the maximum dimmer weights of system, its value is 1, and now DMD is always maintained at " ON " state within a frame period, and system is to field
The light intensity of scape does not decay；r1The minimum light modulation weights of expression system, it represents maximum attenuation ability of the system to light intensity, it
Size is determined by DMD display bit wide.
8. the quick light adjusting system in HDR spatial domain based on DMD as claimed in claim 7, it is characterised in that：The DMD
Display bit wide when being d positions,
9. the quick light adjusting system in HDR spatial domain based on DMD as claimed in claim 6, it is characterised in that：The r1With
rNBetween N-2 light modulation weights of insertion, these light modulation weights meet following constraint：ri+1=2 × ri, i ∈ [1, N).
10. the quick light adjusting system in HDR spatial domain based on DMD as claimed in claim 6, it is characterised in that：The height
Dynamic scene image g (x, y) is calculated according to below equation：
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445955A (en) * | 2018-05-02 | 2019-11-12 | 杭州海康威视数字技术股份有限公司 | A kind of light-supplementing system and video camera |
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| CN113489924A (en) * | 2021-07-14 | 2021-10-08 | 长春长光奥闰光电科技有限公司 | Image forming method |
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