CN1946143A - Method and device for clearing explosure flash - Google Patents
Method and device for clearing explosure flash Download PDFInfo
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Abstract
This invention discloses a method for eliminating flicking of exposure including: computing the brightness gain values of the data of each row on the direction parallel to the light and shade strips in an image with fixed positions of the strips got by a sensitive device to adjust the brightness values of the data on the image based on the gain values to reduce the brightness of the light strips and increase the brightness of the shade. This invention also discloses a device for eliminating flicking of exposure based on said method for eliminating or weakening the influence of strip noise to image result.
Description
Technical field
The present invention relates to technical field of image processing, relate in particular to a kind of method and device of eliminating explosure flash.
Background technology
When under the illumination of the alternating current of 50Hz, taking pictures, the band noise does not appear for making the image that obtains, and time for exposure that usually need sensor devices is set to 1/100 second integral multiple.1/100 second exposure accuracy can make in the image that obtains under the alternating current illumination of 50Hz, can not introduce the band noise.But, under some environment, if ambient brightness is very big, and the brightness of illumination that exists AC power to provide in this ambient brightness, even will be reduced to the time for exposure 1/100 second so, so relatively ambient brightness of time for exposure is still longer, and the image frame that obtains can integral body turn white, even part picture wherein can lose because the time for exposure is oversize.Under such environment, reduce the time for exposure if continue, so since the time for exposure no longer be 1/100 positive integer doubly, and in the image that causes obtaining owing to introducing the band noise light and dark striped appears, these light and dark stripeds are called as flicker (flicker) in this technical field.
Some local alternating current illumination frequencies is 60Hz, and so for to make the image of shooting the band noise can not occur, the time for exposure of sensor devices can be set to 1/120 second integral multiple.Under such power supply lighting environment, if ambient brightness is excessive, the problem that may occur under the bright environment of above-mentioned 50Hz can appear equally.
Therefore, the problem that prior art exists is to exist under the AC power lighting environment, when the time for exposure no longer is the positive integer times of alternation, the band noise that can not take into account ambient brightness and may introduce, thereby make the image that obtains or eliminate the light and shade striped that the band noise causes and cause image brightness undesirable, perhaps cause introducing the band noise owing to take the suitable image of acquisition brightness into account owing to taking into account.
Summary of the invention
In view of this, first purpose of the present invention is: a kind of method of eliminating explosure flash is provided, and when taking into account ambient brightness, the scintillation that elimination or weakening band noise cause.
Second purpose of the present invention is: a kind of device of eliminating explosure flash is provided, and when taking into account ambient brightness, the scintillation that elimination or weakening band noise cause.
First aspect of the object of the invention is achieved through the following technical solutions:
The invention provides a kind of method of eliminating explosure flash, may further comprise the steps:
A, the fixing image of light and shade fringe position that draws at sensor devices, the luminance gain value of every row's data on the direction parallel in the computed image with the light and shade striped;
B, utilize the luminance gain value of described every row's data to adjust the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe.
Capable redundant sub-pixels point width and the row redundant sub-pixels point height of configuration sensor devices, the output frame time that obtains sensor devices is the positive integer times of the half period of described alternating current, the fixed-site of light and shade striped on the image of the sensor devices acquisition that process disposes.
Adjust the time for exposure of sensor devices, the time for exposure that sensor devices adopts adjustment to draw obtains the image that mean picture brightness meets the demands, and steps A is calculated the luminance gain value of every row's data on the direction parallel with the light and shade striped in this image.
The method of adjusting the time for exposure of sensor devices is:
Preset brightness threshold value Y
Target, the average brightness that makes entire image is Y
Mean, so, work as Y
Mean-Y
Target＞LockRange reduces the time for exposure;
Work as Y
Mean-Y
Target＜-LockRange increases the time for exposure;
Work as absolute value | Y
Mean-Y
Target|＜LockRange, finish to adjust;
In the computed image on the direction parallel with the light and shade striped method of the luminance gain value of every row's data be:
After the brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image done accumulation calculating, ask for the average brightness R of every row's data
Imean, i=1,2 ..., H, H be in the image with light and shade striped parallel direction on total row's number of data;
Obtain the gap periods of light and shade striped;
According to the frequency corresponding the average brightness of every row's data is done low-pass filtering treatment, obtain average brightness R through every row's data after the low-pass filtering with the gap periods of light and shade striped
i, i=1,2 ..., H;
According to calculating formula G
i=Y
Target/ R
iAsk for the luminance gain value G of every row's data
i, i=1,2 ..., H, wherein Y
TargetBe the preset brightness threshold value.
Utilize the luminance gain value of every row's data to adjust the brightness value of every row's data on the image, reduce the brightness of bright fringe, the method that increases the brightness of dark fringe is:
The brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image be multiply by the luminance gain value G of these row's data
i, reduce the brightness of bright fringe, increase the brightness of dark fringe.
Second aspect of the object of the invention is achieved through the following technical solutions:
The invention provides a kind of device of eliminating explosure flash, described device comprises: sensor devices, luminance gain value computing module and adjusting module;
Described sensor devices provides the light and shade fringe position fixing image for luminance gain value computing module;
The luminance gain value of every row's data on the direction parallel in the described luminance gain value computing module computed image with the light and shade striped, and result of calculation offered adjusting module;
The result of calculation that described adjusting module utilizes luminance gain value computing module to provide is adjusted the brightness value of every row's data on the image, reduces the brightness of bright fringe, increases the brightness of dark fringe.
Described luminance gain value computing module specifically comprises: average brightness computing unit, computation of Period unit, light and shade fringe spacing, low-pass filter unit, luminance gain value computing unit;
After described average brightness computing unit is done accumulation calculating with the brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image, ask for the average brightness of every row's data;
Computation of Period unit, described light and shade fringe spacing calculates the gap periods of light and shade striped, and result of calculation is offered low-pass filter unit;
The result of calculation that described low-pass filter unit provides according to computation of Period unit, light and shade fringe spacing, the result of calculation of average brightness computing unit is done the low-pass filtering treatment that cut-off frequency is a light and shade fringe spacing cycle inverse, obtain average brightness, and the result of calculation that obtains is offered luminance gain value computing unit through every row's data after the low-pass filtering;
The average brightness of every row's data after the process low-pass filtering that described luminance gain value computing unit provides the preset brightness threshold value divided by low-pass filter unit, obtain the luminance gain value of every row's data on the direction parallel in the image, and provide adjusting module result of calculation with the light and shade striped; Described adjusting module multiply by the brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image luminance gain value of these row's data that luminance gain value computing unit provides, adjust the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe.
Described device also comprises:
Exposure time adjusting module, this module adjusted to the time for exposure, and will adjust the result and offer sensor devices; The time for exposure that described sensor devices adopts exposure time adjusting module to provide obtains the image that mean picture brightness meets the demands.
Described device also comprises:
The sensor devices configuration module, the capable pixel number of this block configuration sensor devices and row pixel number, the output frame time that obtains sensor devices be described alternating current half period positive integer doubly, the fixed-site of light and shade striped on the image that the sensor devices through configuration obtains.
By foregoing as seen, the present invention by in the computed image with light and shade striped parallel direction on the luminance gain value of every row's data, and the luminance gain value of utilizing described every row's data is adjusted the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe, even thereby be not that it is normal to obtain brightness under the alternation positive integer situation doubly, and be not subjected to the image of band noise effect in the time for exposure.Therefore, the realization of technical solution of the present invention can be when taking into account the ambient brightness that comprises the alternating current brightness of illumination, the scintillation that elimination or weakening band noise cause.
Description of drawings
Fig. 1 is based on the schematic diagram of the additional redundant sub-pixels point of photosurface of sensor devices;
Fig. 2 is the flow chart of the method preferred embodiment of the elimination explosure flash that provides of the embodiment of the invention;
Fig. 3 is Y in the method preferred embodiment that provides of the embodiment of the invention
MeanWith Y
TargetThe schematic diagram of making comparisons;
Fig. 4 is the structural representation of device first preferred embodiment of the elimination explosure flash that provides of the embodiment of the invention;
Fig. 5 is the structural representation of device second preferred embodiment of the elimination explosure flash that provides of the embodiment of the invention;
Fig. 6 is the structural representation of device the 3rd preferred embodiment of the bright elimination explosure flash that provides of this embodiment.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawings and the specific embodiments the present invention is described in further detail.
The image that the light and shade fringe position that the embodiment of the invention draws at sensor devices is fixing, the luminance gain value of every row's data on the direction parallel in the computed image with the light and shade striped; Utilize the luminance gain value of described every row's data to adjust the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe.Wherein, the image that is drawn by sensor devices can be video image or static two dimensional image.
The embodiment of the invention is primarily aimed at the fixing image of light and shade fringe position and processes, and therefore, what the embodiment of the invention at first needed to do is to provide the fixing image of light and shade fringe position.The image of exporting when sensor devices is static two dimensional image, if introduce the light and shade striped because of the band noise on this image, the position of these light and shade stripeds is fixed so, in this case, directly utilize the method for elimination explosure flash provided by the invention to eliminate or weaken of the influence of band noise image.If the image of sensor devices output is a video image, so, introduce the appearance of may rolling of light and shade striped because of the band noise on the video image, position on image is unfixing, in this case, the embodiment of the invention is by the configuration sensor devices, obtain the fixing video image of light and shade fringe position, no matter and the image of the sensor devices output of process configuration is static two dimensional image or video image, as long as introduce the light and shade striped because of the band noise on this image, light and shade fringe position is wherein all fixed; Utilize the method for the elimination explosure flash that the embodiment of the invention provides to eliminate afterwards again or weaken of the influence of band noise image.
At first the alternating current illumination with 50Hz is an example, describes the embodiment of the invention obtains the fixing image of light and shade fringe position by the configuration sensor devices method in detail.
The capable redundant sub-pixels point and the row redundant sub-pixels point of configuration sensor devices, the output frame time that makes sensor devices be 1/100 second positive integer doubly, on the image that sensor devices obtained through configuration, fix by the light and shade fringe position that the band noise causes, and do not change in time.The method of configuration sensor devices parameter is as follows:
Make the sensitization face width W pixel of employed sensor devices, high H pixel, and order wishes that the output frame rate F of the sensor devices of acquisition is per second 25 frames.F=100/N, wherein, N is a positive integer, gets N=4 so.
For the output frame time that makes sensor devices be 1/100 positive integer doubly, need replenish redundant sub-pixels point as shown in Figure 1 based on the photosurface of sensor devices usually.Among Fig. 1, photosurface is the wide W pixel that is, height is the rectangular region of H pixel, draws the redundant sub-pixels point zone of hatched example areas for replenishing, and wherein, HB is the capable pixel number that replenishes, and VB is the row pixel number that replenishes.Making the working pulse frequency CLK of sensor devices is 12000000, so, and according to formula (W+HB) * (H+VB), at satisfied 0＜HB＜maxHB, in the scope of 0＜VB＜maxVB, find out the integer value of HB, VB, make the absolute value minimum of CLK*N/100-(W+HB) * (H+VB).Through calculating, obtain HB=128, VB=145.
According to the HB that obtains and VB configuration sensor devices, the output frame time that makes sensor devices be 1/100 positive integer doubly.The used technology of this configuration sensor devices parameter is a prior art, and the present invention obtains the fixing image of light and shade fringe position on image by means of the prior art.
For the half period be not other alternating currents of 1/100 second, when the configuration sensor devices, as long as guarantee the output frame time of sensor devices be the alternation positive integer doubly.
If the current ambient brightness that comprises alternating current illumination is brighter, the mean flow rate of the image of sensor devices output is greater than predefined Y
Target, and the time for exposure of sensor devices has reduced to 1/100, in this case, enables the method for elimination explosure flash provided by the invention and can eliminate or weaken the influence of band noise to image when taking into account image brightness.
Alternating current illumination with 50Hz is an example, utilizes the sensor devices through configuration, describes a preferred embodiment of the method for elimination explosure flash provided by the invention in detail.The handling process of this embodiment is shown in Figure 2 as scheming, and may further comprise the steps:
In this step, sensor devices is according to the average brightness Y of the entire image that obtains
MeanWith preset brightness threshold value Y
TargetBetween difference adjust the time for exposure.If Y
MeanWith Y
TargetDifference surpass the range L ockRange of a setting, need to adjust the time for exposure so, the regulation rule of time for exposure is specially:
If Y
Mean-Y
Target＞LockRange reduces the time for exposure so; After time for exposure reduced, the average brightness of the image that sensor devices obtains is also corresponding to be reduced, and continued to adjust the time for exposure according to the regulation rule of time for exposure.
If Y
Mean-Y
Target＜-LockRange increases the time for exposure so; After time for exposure increased, the also corresponding increase of the average brightness of the image that sensor devices obtains continued to adjust the time for exposure according to the regulation rule of time for exposure.
If absolute value | Y
Mean-Y
Target|＜LockRange, the average brightness that the image that sensor devices obtains is described can finish to adjust near luminance threshold.
LockRange is actual to be to be image brightness mean value Y
MeanThe standard that meets the demands and set, the setting of this standard can be adopted existing techniques in realizing.
Adjust and finish back Y
MeanWith Y
TargetBetween difference and the comparison of LockRange can be referring to shown in Figure 3.
The adjusted time for exposure is less than 1/100 second, no longer be 1/100 positive integer doubly, the light and shade striped that is caused by the band noise can appear on the image.
The time for exposure that step 202, sensor devices obtain after adopting and adjusting, a two field picture is exported.
In this step, on the image of sensor devices output, the light and shade fringe position is fixed, and does not change in time.
In this step, establish the light and shade striped in the horizontal direction.If in the sensor devices, W=640, H=480, so to the brightness value of 640 pixels in every row do add up after, obtain the mean value of this row brightness.The capable average brightness of trying to achieve altogether has 480, is respectively R
1mean, R
2mean..., R
480mean
The line of H capable average brightness on reference axis that is drawn by step 203 presents cyclic variation, therefore in step 204, can be FFT (fast fourier transform) by capable average brightness to H of obtaining in the step 203, obtains the gap periods T of light and shade striped.In concrete the enforcement, also can obtain the gap periods T of described light and shade striped by other mathematical methods.
Because the frequency of scape or thing is lower in the relative image of the frequency of occurrences of light and shade striped, therefore, adopt the frequency 1/T of the gap periods T correspondence of light and shade striped that the average brightness of the every row's data on the light and shade stripe direction in the image is done low-pass filtering treatment by step 205, elimination radio-frequency component wherein keeps the low-frequency component that embodies light and shade striped characteristic.
If 480 average brightness that obtained by step 203 are respectively R
1mean, R
2mean..., R
480mean, step 205 is done the low-pass filtering treatment that cut-off frequency is 1/T to these 480 average brightness, and 480 that obtain is R through the average brightness after the low-pass filtering
1..., R
480If wherein a bright fringe correspondence preceding 10 is arranged data, the average brightness after the process low-pass filtering of this 10 row data correspondence is R
1..., R
10, R so
1..., R
10All than Y
TargetGreatly.Similarly, if the average brightness wherein after the process low-pass filtering of a dark fringe correspondence is R
11..., R
20, R so
11..., R
20All than Y
TargetLittle.
Step 206, according to calculating formula G
i=Y
Target/ R
iAsk for the luminance gain value G of every row's data
i, i=1,2 ..., H.
In this step, the luminance gain value of respectively arranging data of bright fringe correspondence is less than 1, and the luminance gain value of respectively arranging data of dark fringe correspondence is greater than 1.
In this step, with in the image with light and shade striped parallel direction on the brightness value of each pixel in every row's data multiply by the luminance gain value G of these row's data
i, so since the luminance gain value of respectively arranging data of bright fringe correspondence less than 1, therefore, each pixel in every row's data of bright fringe correspondence multiply by the luminance gain value G of these row's data
iAfter, can reduce the average brightness of these row's data, thereby reduce the brightness of bright fringe; And since the luminance gain value of respectively arranging data of dark fringe correspondence greater than 1, so each pixel in every row's data of dark fringe correspondence multiply by the luminance gain value G of these row's data
iAfter, can increase the average brightness of these row's data, thereby increase the brightness of dark fringe.Like this, it is not obvious that the luminance difference of light and shade striped just seems on image, thereby eliminate or weakened the influence of band noise to image.
Said process at ambient lighting comprise 50Hz alternating current illumination, for the alternating current operating frequency is not the situation of 50Hz, during as 60Hz, still can apply mechanically the method for the elimination explosure flash that the invention described above provides, only need be when the configuration sensor devices, the output frame time that makes sensor devices be the alternation positive integer doubly.
The method of the elimination explosure flash that the present invention also provides based on the invention described above provides a kind of device of eliminating explosure flash, and shown in Figure 4 is the structural representation of first preferred embodiment of this device.In the present embodiment, this device comprises: sensor devices 401, luminance gain value computing module 402 and adjusting module 403.
Described sensor devices 401 provides the light and shade fringe position fixing image for luminance gain value computing module 402.
In described luminance gain value computing module 402 computed image with light and shade striped parallel direction on the luminance gain value of every row's data, and result of calculation offered adjusting module 403.
The result of calculation that described adjusting module 403 utilizes luminance gain value computing module 402 to provide is adjusted the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe, thereby band The noise in elimination or the weakening image makes to obtain comparatively ideal image.
Described luminance gain value computing module 402 specifically comprises: average brightness computing unit 4021, computation of Period unit, light and shade fringe spacing 4022, low-pass filter unit 4023, luminance gain value computing unit 4024.
Described average brightness computing unit 4021 with in the image with light and shade striped parallel direction on after the brightness value of each pixel in every row's data does accumulation calculating, ask for the average brightness R of every row's data
Imean, i=1,2 ..., H.
Computation of Period unit, described light and shade fringe spacing 4022 utilizes FFT or other mathematical methods to calculate the gap periods T of light and shade striped, and result of calculation is offered low-pass filter unit 4023;
The result of calculation that described low-pass filter unit 4023 provides according to computation of Period unit, light and shade fringe spacing 4022, it is 1/T that the result of calculation of average brightness computing unit is done cut-off frequency, be the low-pass filtering treatment of light and shade fringe spacing cycle inverse, obtain average brightness R through every row's data after the low-pass filtering
i, i=1,2 ..., H, and the result of calculation that obtains offered luminance gain value computing unit 4024;
Described luminance gain value computing unit 4024 is according to calculating formula G
i=Y
Target/ R
i, the average brightness of every row's data after the process low-pass filtering that the preset brightness threshold value is provided divided by low-pass filter unit, obtain in the image with light and shade striped parallel direction on the luminance gain value of every row's data, and provide adjusting module with result of calculation; Described adjusting module with in the image with light and shade striped parallel direction on the brightness value of each pixel in every row's data multiply by the luminance gain value of these row's data that luminance gain value computing unit provides, adjust the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe.
Shown in Figure 5 is the structural representation of second preferred embodiment of the device of elimination explosure flash provided by the invention.Wherein, be light and shade fringe position on the still image, originally be implemented in and increase a sensor devices configuration module 501 on the device basic shown in Figure 4, the capable pixel number of this block configuration sensor devices and row pixel number, the output frame time that makes sensor devices be described alternating current half period positive integer doubly, and configuration result offered sensor devices.From fixed-site through the light and shade striped on the image of the sensor devices output of configuration.Luminance gain value computing module 402 and adjusting module 403 are done the processing of eliminating or weakening the band noise effect to the fixing image of light and shade fringe position of sensor devices 401 outputs again.
Shown in Figure 6 is the structural representation of the 3rd preferred embodiment of the device of elimination explosure flash provided by the invention.Wherein, for obtaining the normal image of brightness, originally being implemented in increases a time for exposure adjustment unit 601 on the device basic shown in Figure 5.Described time for exposure adjustment unit 601 is according to time for exposure regulation rule, i.e. Y
MeanWith Y
TargetThe difference condition that can satisfy, the time for exposure is adjusted, and will adjust the result and offer sensor devices, the brightness of the image that sensor devices obtains is satisfied the demands.Through the adjusted time for exposure of time for exposure adjustment unit no longer be usually alternation of providing of AC power positive integer doubly.Therefore, need or weaken of the influence of band noise by above-mentioned degree gain value computation module 402 and adjustment unit 403 eliminations to image.
The method of the elimination explosure flash that is provided by the invention described above and the specific embodiment of device are as seen, the present invention by in the computed image with light and shade striped parallel direction on the luminance gain value of every row's data, and the luminance gain value of utilizing described every row's data is adjusted the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe, even thereby be not under the alternation positive integer situation doubly in the time for exposure, acquisition brightness is normal, and is not subjected to the image of band noise effect.Therefore, the realization of technical scheme provided by the invention can be when taking into account the ambient brightness that comprises the alternating current brightness of illumination, the scintillation that elimination or weakening band noise cause.
Claims (10)
1, a kind of method of eliminating explosure flash is characterized in that, may further comprise the steps:
A, the fixing image of light and shade fringe position that draws at sensor devices, the luminance gain value of every row's data on the direction parallel in the computed image with the light and shade striped;
B, utilize the luminance gain value of described every row's data to adjust the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe.
2, method according to claim 1, it is characterized in that, the capable redundant sub-pixels of configuration sensor devices is counted and the row redundant sub-pixels is counted, the output frame time that obtains sensor devices be described alternating current half period positive integer doubly, the fixed-site of light and shade striped on the image that the sensor devices through configuration obtains.
3, method according to claim 1, it is characterized in that, adjust the time for exposure of sensor devices, the time for exposure that sensor devices adopts adjustment to draw obtains the image that mean picture brightness meets the demands, and steps A is calculated the luminance gain value of every row's data on the direction parallel with the light and shade striped in this image.
4, method according to claim 3 is characterized in that, the method for adjusting the time for exposure of sensor devices is:
Preset brightness threshold value Y
Target, the average brightness that makes entire image is Y
Mean, so,
Work as Y
Mean-Y
Target＞LockRange reduces the time for exposure;
Work as Y
Mean-Y
Target＜-LockRange increases the time for exposure;
Work as absolute value | Y
Mean-Y
Target|＜LockRange, finish to adjust;
Wherein LockRange is image brightness mean value Y
MeanThe standard that meets the demands and set.
5, method according to claim 1 and 2 is characterized in that, in the computed image on the direction parallel with the light and shade striped method of the luminance gain value of every row's data be:
After the brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image done accumulation calculating, ask for the average brightness R of every row's data
Imean, i=1,2 ..., H, H be in the image with light and shade striped parallel direction on total row's number of data;
Obtain the gap periods of light and shade striped;
According to the frequency corresponding the average brightness of every row's data is done low-pass filtering treatment, obtain average brightness R through every row's data after the low-pass filtering with the gap periods of light and shade striped
i, i=1,2 ..., H;
According to calculating formula G
i=Y
Target/ R
iAsk for the luminance gain value G of every row's data
i, i=1,2 ..., H, wherein Y
TargetBe the preset brightness threshold value.
6, method according to claim 5 is characterized in that, utilizes the luminance gain value of every row's data to adjust the brightness value of every row's data on the image, reduces the brightness of bright fringe, and the method that increases the brightness of dark fringe is:
The brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image be multiply by the luminance gain value G of these row's data
i, reduce the brightness of bright fringe, increase the brightness of dark fringe.
7, a kind of device of eliminating explosure flash is characterized in that, described device comprises: sensor devices, luminance gain value computing module and adjusting module;
Described sensor devices provides the light and shade fringe position fixing image for luminance gain value computing module;
The luminance gain value of every row's data on the direction parallel in the described luminance gain value computing module computed image with the light and shade striped, and result of calculation offered adjusting module;
The result of calculation that described adjusting module utilizes luminance gain value computing module to provide is adjusted the brightness value of every row's data on the image, reduces the brightness of bright fringe, increases the brightness of dark fringe.
8, device according to claim 7 is characterized in that, described luminance gain value computing module specifically comprises: average brightness computing unit, computation of Period unit, light and shade fringe spacing, low-pass filter unit, luminance gain value computing unit;
After described average brightness computing unit is done accumulation calculating with the brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image, ask for the average brightness of every row's data;
Computation of Period unit, described light and shade fringe spacing calculates the gap periods of light and shade striped, and result of calculation is offered low-pass filter unit;
The result of calculation that described low-pass filter unit provides according to computation of Period unit, light and shade fringe spacing, the result of calculation of average brightness computing unit is done the low-pass filtering treatment that cut-off frequency is a light and shade fringe spacing cycle inverse, obtain average brightness, and the result of calculation that obtains is offered luminance gain value computing unit through every row's data after the low-pass filtering;
The average brightness of every row's data after the process low-pass filtering that described luminance gain value computing unit provides the preset brightness threshold value divided by low-pass filter unit, obtain the luminance gain value of every row's data on the direction parallel in the image, and provide adjusting module result of calculation with the light and shade striped; Described adjusting module multiply by the brightness value of each pixel in every row's data on the direction parallel with the light and shade striped in the image luminance gain value of these row's data that luminance gain value computing unit provides, adjust the brightness value of every row's data on the image, reduce the brightness of bright fringe, increase the brightness of dark fringe.
9, according to claim 7 or 8 described devices, it is characterized in that described device also comprises:
Exposure time adjusting module, this module adjusted to the time for exposure, and will adjust the result and offer sensor devices; The time for exposure that described sensor devices adopts exposure time adjusting module to provide obtains the image that mean picture brightness meets the demands.
10, according to claim 7 or 8 described devices, it is characterized in that described device also comprises:
The sensor devices configuration module, the capable pixel number of this block configuration sensor devices and row pixel number, the output frame time that obtains sensor devices be described alternating current half period positive integer doubly, the fixed-site of light and shade striped on the image that the sensor devices through configuration obtains.
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| Publication number | Priority date | Publication date | Assignee | Title |
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