CN104113744A - All-weather colour camera white balance processing method and device - Google Patents
All-weather colour camera white balance processing method and device Download PDFInfo
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Abstract
The invention discloses an all-weather colour camera white balance processing method and device. The method comprises the following steps: the mapping relationship table of exposure parameters of images, the image brightness and the environment illumination is obtained through training; an image to be processed is acquired and the image brightness of the current image to be processed and corresponding exposure parameters are acquired, and the current environment illumination information is acquired according to the exposure parameters, the image brightness and the mapping relationship table; the infrared influence removing process is performed on the image to be processed according to the current environment illumination information and the current infrared light intensity information that detected on a real-time basis; and the white balance correction is performed on the processed image obtained through the infrared influence removing process. By adopting the method and device of the invention, the distortion problem caused by the reason that correction cannot be performed effectively due to the influences of infrared light in the automatic white balance process can be avoided, and at the same time, the brightness problem in the low illumination condition can be solved to make a color image having the advantage of high quality still can be obtained in the low illumination condition.
Description
Technical field
The present invention relates to technical field of image processing, in particular to a kind of all-weather colorful video camera white balancing treatment method and device.
Background technology
Conventionally, the video camera apparatus such as Digital Video and digital camera generally comprises: optical lens, imageing sensor, picture processing chip, image transmission module and image display.
As everyone knows, the object of color of the same race can present different colors under the irradiation of Different Light, and for example, the object of grey can present yellow under incandescent lamp irradiates, and under cold light source irradiates, can present cyan etc.Because human eye has based on the automatic regulation function for color under this type of environment, therefore under different light sources, human eye can reduce the essential color of object.But, under this type of environment, after optical lens and imageing sensor processing, the color of output and the result of eye-observation are variant, for example show by a specific experiment, under fluorescent lamp irradiates, the image of grey object output after optical lens and imageing sensor processing presents obvious green.Therefore, must process the color of this output image, it be presented and the coming to the same thing or close grey of eye-observation under different light sources, the main implementation method that adopts white balance correction at present.
In the existing method that realizes white balance correction, between optical lens and imageing sensor, can add a two filter IR_CUT.Particularly, in the middle of practical application, after the light intensity induction installation outside optical lens detects the power variation of light, IR-CUT automatic switchover filter, thereby make output image reach optimum efficiency: in the time that IR_CUT is switched to infrared fileter, filter out infrared band, final output image is shown as colour; In the time that IR_CUT is switched to full impregnated spectral filter, final output image is black and white.
But, conventionally no matter the actual imageing sensor using (is CMOS(Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductors (CMOS)) or CCD(Charge-coupled is Device, charge coupled cell)) all can sense all visible light wave ranges and part infrared band.In the time that IR_CUT switches to full impregnated spectral filter, the red receiver of imageing sensor also obtains infrared band in obtaining red light wave band, thereby can cause the red light wave band in output image can be larger than normal value, make output image entirety partially red, now adopt existing white balance algorithm cannot proofread and correct these output images.In the time that IR_CUT switches to infrared fileter, although effective filtering infrared light wave band also can reduce light-inletting quantity simultaneously, reduce image brightness, thereby cause exposure parameter in picture processing chip to improve, and then increased noise, particularly shine in environment low, the noise of image can sharply increase.
In addition, two filter IR_CUT also have following two larger defects in use:
(1) be no matter normal when switching or extremely switching, because IR_CUT needs mechanically to switch back and forth, after the mechanical wear of long period, damage than being easier to;
(2) in the middle of practical application, the current handoff algorithms for IR_CUT is relatively not too reliable, for example, can cause IR_CUT switching back and forth at the Critical Light switching according under situation, causes thus the damage probability of IR_CUT further to improve.
Summary of the invention
Realize in order to solve the two filter IR_CUT of existing employing that output map kine bias that the method for white balance correction occurs is red causes being difficult to carry out white balance correction and the low problem according to causing the noise of output image to increase under environment, the object of the embodiment of the present invention is to provide a kind of all-weather colorful video camera white balancing treatment method and device, and an all-weather colorful video camera that does not comprise IR_CUT, its can be effectively to output image carry out white balance correction, to obtain the coloured image that color is gorgeous, picture noise is less.
In order to reach the object of the embodiment of the present invention, the present invention realizes by the following technical solutions:
A kind of all-weather colorful video camera white balancing treatment method, comprising:
Obtain the mapping relations table between exposure parameter, image brightness and the ambient light illumination of image by training;
Obtain pending image, and obtain the image brightness of this current pending image and the corresponding exposure parameter with this, obtain current ambient light illumination information according to described exposure parameter, image brightness and mapping relations table;
According to current ambient light illumination information and the current infrared light strength information detecting in real time, pending image is gone to the infrared processing that affects;
On infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
Preferably, comprise by the step of training the mapping relations table between exposure parameter, image brightness and the ambient light illumination to obtain image:
Irradiate material obtaining image with different light source, obtain the exposure parameter information of near ambient light illumination information optical lens, image and the monochrome information of the image that obtains simultaneously;
Set up accordingly the mapping relations table between exposure parameter, image brightness and the ambient light illumination of image and preserve.
Preferably, go the infrared step that affects processing to comprise according to current ambient light illumination information and the current infrared light strength information detecting in real time on pending image:
The ambient light illumination information that foundation is current and the current infrared light strength information detecting in real time calculate the ratio of infrared band in ambient light illumination;
According to this ratio, each channel data of pending image is gone to the infrared processing that affects, to reject the impact of infrared light.
Preferably, on infraredly affecting the step that processing image that processing obtains carries out white balance correction and comprise through going:
Carry out piecemeal to processing image;
Pick out image block that color approaches grey as candidate's ash piece;
Calculate the color-values of the grey piece of pending image according to candidate's ash piece;
The color-values of the grey piece of the pending image of foundation obtains correction parameter of white balance;
According to the correction parameter of white balance that obtains on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
A kind of all-weather colorful video camera white balance processing equipment, comprising:
The first data acquisition unit, the image luminance information of irradiating the image of material and obtaining this image for gathering Different Light; Obtain ambient light illumination information current in the time taking this image and the exposure parameter information of picture processing chip;
Training unit, for obtain image luminance information and corresponding ambient light illumination information and the exposure parameter information of picture processing chip with it from the first data acquisition unit, and training obtains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image accordingly;
The second data acquisition unit, for the pending image of Real-time Obtaining guarded region, and obtains image luminance information and the current infrared light strength information of this pending image, also obtains current exposure parameter information from picture processing chip simultaneously; Go to the infrared unit that affects, for obtain exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit, and inquire about accordingly described mapping relations table and obtain current ambient light illumination information; And further according to current ambient light illumination information and the infrared light strength information obtaining from the second data acquisition unit, pending image is gone to the infrared processing that affects;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
Preferably, described training unit comprises:
Processing unit, for irradiating in Different Light under the environment of material, trains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three who obtains image;
Storage unit, for the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of memory image.
Preferably, described in, go to the infrared unit that affects to comprise:
Receiving element, for obtaining exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit; And for obtaining current infrared light strength information; And be further used for obtaining the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image from training unit;
Reject the infrared processing unit that affects, be used for inquiring about described mapping relations table according to the exposure parameter corresponding with described pending image and image brightness and obtain current ambient light illumination information, and according to current ambient light illumination information and current infrared light strength information, pending image is gone to the infrared processing that affects.
Preferably, the infrared processing unit that affects of described rejecting goes the infrared step that affects processing to comprise according to current ambient light illumination information and current infrared light strength information on pending image:
Calculate the ratio of infrared band in ambient light illumination according to current ambient light illumination information and current infrared light strength information;
According to this ratio, each channel data of pending image is gone to the infrared processing that affects, to reject the impact of infrared light.
Preferably, described white balance correction unit comprises:
Image block unit, for carrying out piecemeal to processing image;
Extract candidate ash module unit, for picking out image block that color approaches grey as candidate's ash piece;
Ash piece determining unit, for calculating the color-values of the grey piece of pending image according to candidate's ash piece;
Correction parameter of white balance determining unit, obtains correction parameter of white balance for the color-values of the grey piece according to pending image;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
A kind of all-weather colorful video camera, comprises optical lens, imageing sensor, picture processing chip, image transmission module and image display, and it also comprises all-weather colorful video camera white balance processing equipment as above, and described device comprises:
The first data acquisition unit, the image luminance information of irradiating the image of material and obtaining this image for gathering Different Light; Obtain ambient light illumination information current in the time taking this image and the exposure parameter information of picture processing chip;
Training unit, for obtain image luminance information and corresponding ambient light illumination information and the exposure parameter information of picture processing chip with it from the first data acquisition unit, and training obtains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image accordingly;
The second data acquisition unit, for the pending image of Real-time Obtaining guarded region, and obtains image luminance information and the current infrared light strength information of this pending image, also obtains current exposure parameter information from picture processing chip simultaneously; Go to the infrared unit that affects, for obtain exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit, and inquire about accordingly described mapping relations table and obtain current ambient light illumination information; And further according to current ambient light illumination information and the infrared light strength information obtaining from the second data acquisition unit, pending image is gone to the infrared processing that affects;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
The technique scheme that adopts the embodiment of the present invention to provide, its video camera can be avoided cannot effectively proofreading and correct owing to being subject to the impact of infrared light the problem of dtmf distortion DTMF causing in Automatic white balance process, solved the low brightness problem according to situation simultaneously, make still can obtain the good coloured image of quality low according under situation, also do not affect white balance correction work under the higher situation of illumination, user experiences better simultaneously.
In addition, the video camera that the embodiment of the present invention provides is owing to no longer comprising these parts of IR_CUT, for the existing video camera that adopts IR_CUT, to a certain extent in can obtaining more excellent image quality, reduce the holistic cost of video camera, owing to need not being subject to the impaired impact of IR_CUT, improved the availability of video camera simultaneously.
Brief description of the drawings
Fig. 1 is a kind of all-weather colorful video camera white balancing treatment method schematic flow sheet provided by the invention;
A kind of all-weather colorful video camera white balancing treatment method schematic flow sheet that Fig. 2 provides for the present invention's one specific embodiment;
A kind of all-weather colorful video camera white balance processing equipment structural representation that Fig. 3 provides for the embodiment of the present invention.
Realization, functional characteristics and the excellent effect of the object of the invention, be described further below in conjunction with specific embodiment and accompanying drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in further detail, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
The main thought of the embodiment of the present invention is:
First obtain the mapping relations between exposure parameter, image brightness and the ambient light illumination of image by training;
Then obtain pending image, exposure parameter and infrared light intensity, calculate ambient light illumination according to the mapping relations between image brightness and the ambient light illumination three of exposure parameter, image;
According to the ratio of ambient light illumination and infrared light, pending image is rejected to infrared light impact again, generate the image without infrared light impact;
Finally the image without infrared impact is carried out to white balance correction.
More specifically, as shown in Figure 1, a kind of all-weather colorful video camera white balancing treatment method that the embodiment of the present invention provides, comprises the steps:
S10, obtain the mapping relations table between exposure parameter, image brightness and the ambient light illumination of image by training;
S20, obtain pending image, and obtain the image brightness of this current pending image and the corresponding exposure parameter with this, obtain current ambient light illumination information according to described exposure parameter, image brightness and mapping relations table;
S30, according to current ambient light illumination information and the current infrared light strength information detecting in real time, pending image is gone to the infrared processing that affects;
S40, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
In training, when obtaining the mapping relations table between exposure parameter, image brightness and ambient light illumination, real time environment illumination when photographic subjects material can be obtained accurately by testing equipments such as illuminance meters each time.
But in the middle of practical application, owing to being subject to the impact of volume and cost, (conventionally the measuring equipment such as illuminance meter has larger volume and comparatively expensive price, the video surveillance point that is arranged in One's name is legion is obviously outdated), illuminance meters etc. obviously can not use in order to the testing equipment of accurate measurement current environment illumination, conventionally, also can be by adopting easily as the measuring equipments such as photo resistance carry out measurement environment illumination, but the data precision that this type of measuring equipment is measured is lower
Thereby aspect of the embodiment of the present invention, the method of training by employing, preserve the mapping relations between image brightness, exposure parameter and ambient light illumination and form mapping relations table, so that in follow-up image processing process by table look-up mode obtain current environment illuminance information, compare and adopt the measuring equipment measurement environment illumination data such as photo resistance to there is higher accuracy.
Particularly, in described step S10, comprise by the step of training the mapping relations table between exposure parameter, image brightness and the ambient light illumination to obtain image:
S101, irradiate material obtaining image with different light source, the image luminance information of the exposure parameter information when obtaining near ambient light illumination information, picture processing chip optical lens simultaneously and processing this picture and the image obtaining;
Mapping relations table between S102, the exposure parameter of setting up accordingly image, image brightness and ambient light illumination is also preserved.
Particularly, according to the embodiment of the present invention aspect, in described step S30, go the infrared step that affects processing to comprise according to current ambient light illumination information and infrared light strength information on pending image:
S301, current ambient light illumination information and the infrared light strength information of foundation calculate the ratio of infrared band in ambient light illumination;
S302, according to this ratio, each channel data of pending image is gone to the infrared processing that affects, to reject the impact of infrared light.
Particularly, according to the embodiment of the present invention aspect, in described step S40, on infraredly affecting the step that processing image that processing obtains carries out white balance correction and comprise through going:
S401, to process image carry out piecemeal;
S402, pick out image block that color approaches grey as candidate's ash piece;
S403, calculate the color-values of the grey piece of pending image according to candidate ash piece;
The color-values of the grey piece of S404, the pending image of foundation obtains correction parameter of white balance;
S405, according to the correction parameter of white balance that obtains on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
The performing step of the present invention's one specific embodiment comprises:
Step 1: the color image that the light source of collection varying strength produces while irradiating material, obtain near the ambient light illumination of optical lens and brightness and the exposure parameter of color image, obtain the mapping relations between exposure parameter, image brightness and ambient light illumination three.
In embodiments of the present invention, light source can be that single light source can be also hybrid light source, and the intensity of light source can be continuously adjustable, and General Requirements illumination is from 0.001lux to 50000lux, and concrete implementation step as shown in Figure 2.
Exposure parameter mainly comprises the gain of time for exposure, aperture size and image processor.
The image brightness of image can be calculated acquisition according to the color image obtaining, and the method for calculating is varied, for example, can adopt following computing formula, supposes that the band strength of pending image three channel is respectively R, G, and B, the brightness of image is:
I=(R+G+B)/3。
Suppose that exposure parameter comprises the gain G ain of time for exposure T, aperture size F, image processor, and in the time that ambient light illumination is L, the mapping relations between T, F, Gain, I and L are set up in training, and this mapping relations are preserved into mapping relations table, so that in the middle of follow-up application, from this mapping relations table, can find corresponding L by T, F, Gain and I fast.
Step 2: obtain the image without infrared light impact.
First obtain the color image (R with infrared impact
1, G
1, B
1), also obtain current exposure parameter T simultaneously
1, F
1, Gain
1, by the infrared photosensitive infrared light intensity W that obtains
1.Owing to having removed IR_CUT in the embodiment of the present invention, in device, there is no infrared fileter, the image obtaining can be subject to the impact of infrared light.Particularly affected by infrared light larger low according in environment, therefore, color image that noise low beautiful in order to obtain, the impact that needs to remove infrared light.Calculate the brightness I of image
1, can calculate according to the method for the computed image brightness described in step 1; According to T
1, F
1, Gain
1, I
1mapping relations table between inquiry T, F, Gain, I and L obtains current ambient light illumination L
1; And further calculate the ratio cc=W of infrared band in ambient light illumination
1/ L
1, the then impact on each channel data rejecting infrared light.According to a preferred embodiment of the present invention, the method for rejecting infrared light impact is:
Suppose really to belong to the R ' of red wave band
1, there is following equation:
W
1=αI
1=α(R
1+G
1+B
1)/3；
Infrared light intensity and real red wave band have formed the red wave band of pending image, that is:
W
1+R′
1=R
1；
R
1-R '
1=α (R
1+ G
1+ B
1)/3, are further really belonged to the pixel value of red wave band:
R′
1=R
1-α(R
1+G
1+B
1)/3；
In order to keep the brightness of image constant, need to be multiplied by a coefficient to the each component of triple channel, coefficient has following calculating:
β=((R
1+G
1+B
1)/3)/((R′
1+G
1+B
1)/3)；
Further obtain:
β=((R
1+G
1+B
1))/((R
1+G
1+B
1-α(R
1+G
1+B
1)/3))=3(3-α)；
Finally obtain new image (R "
1, G "
1, B "
1):
B″
1=βB
1=3B
1/(3-α),
G″
1=βG
1=3G
1/(3-α),
R″
1=βR
1=3/(3-α)(R
1-α(R
1+G
1+B
1)/3)=R
1-α/(3-α)(G
1+B
1)。
Step 3: determine the candidate's ash piece that affects image without infrared.
First will be divided into limited the rectangular block that size shape is equal without the infrared image that affects, then in all rectangular blocks, pick out color and approach grey as candidate's ash piece.In the middle of practical application, the decision method that color approaches grey piece includes but not limited to adopt following several method to realize:
(1) the three-channel color-values of supposing rectangular block is R, G, and B, converts it in YCbCr colour system, and the rectangular block that meets following condition is grey piece:
|Cb|＜Cb
min,|Cr|＜Cr
min,Y
min＜Y＜Y
max。
(2) the three-channel color-values of supposing rectangular block is R, G, and B, the rectangular block that meets following condition is grey piece:
(R+ε)/(G+)＜T
1,(G+ε)/(B+ε)＜T
2,(B+ε)/(R+ε)＜T
3；
Wherein, in above formula, ε is minimum, T
1, T
2, T
3for being greater than 1 threshold value.
Step 4: the color character of determining pending image ash piece according to candidate's ash piece.
Suppose that the candidate's ash piece extracting has N, the RGB average value of i grey piece is R
i, G
i, B
i, the rgb value of last required grey piece is respectively R, G, B.In the middle of practical application, calculate R, G, the method for B includes but not limited to following several method:
Method one: adopt average weighted mode to calculate:
，
，
。
Method two: to R
1..., R
narrange and obtain according to order from small to large
, in the time that N is even number
, in the time that N is odd number
; Process G with identical method
1..., G
n, B
1..., B
nobtain G and B.
Method three: adopt following computing formula to calculate:
，
，
。
Step 205: determine correction parameter of white balance and wrap balance correction.
After determining R, G, the B of pending image ash piece, what in fact (R, G, B) characterized is the characteristic of light source, can change the correction parameter of white balance that light source is corresponding according to its calculating, be respectively: RGain, GGain and BGain, and utilize RGain, GGain and BGain to carry out white balance correction to pending image.RGain, GGain and BGain determine according to following formula;
RGain=R/MinRGB,GGain=G/MinRGB,BGain=B/MinRGB,
Wherein, MinRGB represents the minimum value in (R, G, B).RGain, GGain and BGain can regulate the color-values of each pixel in image, concrete control method is to regulate R component according to RGain parameter, regulate G component according to GGain parameter, regulate B component according to BGain parameter, obtain distortionless correcting image, certain pixel of establishing before correction is (r1, g1, b1) proofread and correct after this pixel be r2=r1*RGain, g2=g1*GGain, b2=b1*BGain.
So far, white balance correction processing finishes.
As shown in Figure 3, the embodiment of the present invention also provides a kind of all-weather colorful video camera white balance processing equipment, comprising:
The first data acquisition unit, the image luminance information of irradiating the image of material and obtaining this image for gathering Different Light; Obtain ambient light illumination information current in the time taking this image and the exposure parameter information of picture processing chip;
Training unit, for obtain image luminance information and corresponding ambient light illumination information and the exposure parameter information of picture processing chip with it from the first data acquisition unit, and training obtains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image accordingly;
The second data acquisition unit, for the pending image of Real-time Obtaining guarded region, and obtains image luminance information and the current infrared light strength information of this pending image, also obtains current exposure parameter information from picture processing chip simultaneously; Go to the infrared unit that affects, for obtain exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit, and inquire about accordingly described mapping relations table and obtain current ambient light illumination information; And further according to current ambient light illumination information and the infrared light strength information obtaining from the second data acquisition unit, pending image is gone to the infrared processing that affects;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
Preferably, described training unit comprises:
Processing unit, for irradiating in Different Light under the environment of material, trains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three who obtains image;
Storage unit, for the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of memory image.
Preferably, described in, go to the infrared unit that affects to comprise:
Receiving element, for obtaining exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit; And for obtaining current infrared light strength information; And be further used for obtaining the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image from training unit;
Reject the infrared processing unit that affects, be used for inquiring about described mapping relations table according to the exposure parameter corresponding with described pending image and image brightness and obtain current ambient light illumination information, and according to current ambient light illumination information and current infrared light strength information, pending image is gone to the infrared processing that affects.
Preferably, the infrared processing unit that affects of described rejecting goes the infrared step that affects processing to comprise according to current ambient light illumination information and infrared light strength information on pending image:
Calculate the ratio of infrared band in ambient light illumination according to current ambient light illumination information and infrared light strength information;
According to this ratio, each channel data of pending image is gone to the infrared processing that affects, to reject the impact of infrared light.
Preferably, described white balance correction unit comprises:
Image block unit, for carrying out piecemeal to processing image, is divided into limited the rectangular block that size shape is identical by the processing image without infrared impact;
Extract candidate ash module unit, for picking out image block that color approaches grey as candidate's ash piece;
Ash piece determining unit, for calculating the color-values of the grey piece of pending image according to candidate's ash piece; Color-values according to candidate's ash piece is determined the color-values that affects image ash piece without infrared
Correction parameter of white balance determining unit, obtains correction parameter of white balance for the color-values of the grey piece according to pending image;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
Correspondingly, continue with reference to figure 3, the embodiment of the present invention also provides a kind of all-weather colorful video camera, comprise optical lens, imageing sensor, picture processing chip, image transmission module and image display, it also comprises all-weather colorful video camera white balance processing equipment as above, and described device comprises:
The first data acquisition unit, the image luminance information of irradiating the image of material and obtaining this image for gathering Different Light; Obtain ambient light illumination information current in the time taking this image and the exposure parameter information of picture processing chip;
Training unit, for obtain image luminance information and corresponding ambient light illumination information and the exposure parameter information of picture processing chip with it from the first data acquisition unit, and training obtains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image accordingly;
The second data acquisition unit, for the pending image of Real-time Obtaining guarded region, and obtains image luminance information and the current infrared light strength information of this pending image, also obtains current exposure parameter information from picture processing chip simultaneously; Go to the infrared unit that affects, for obtain exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit, and inquire about accordingly described mapping relations table and obtain current ambient light illumination information; And further according to current ambient light illumination information and the infrared light strength information obtaining from the second data acquisition unit, pending image is gone to the infrared processing that affects;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
Detailed description for above-mentioned all-weather colorful video camera white balance processing equipment can be with reference to mentioned above, this do not done repetition here and carefully state.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. an all-weather colorful video camera white balancing treatment method, is characterized in that, comprising:
Obtain the mapping relations table between exposure parameter, image brightness and the ambient light illumination of image by training;
Obtain pending image, and obtain the image brightness of this current pending image and the corresponding exposure parameter with this, obtain current ambient light illumination information according to described exposure parameter, image brightness and mapping relations table;
According to current ambient light illumination information and the current infrared light strength information detecting in real time, pending image is gone to the infrared processing that affects;
On infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
2. all-weather colorful video camera white balancing treatment method as claimed in claim 1, is characterized in that, comprises by the step of training the mapping relations table between exposure parameter, image brightness and the ambient light illumination to obtain image:
Irradiate material obtaining image with different light source, obtain the exposure parameter information of near ambient light illumination information optical lens, image and the image luminance information of the image that obtains simultaneously;
Set up accordingly the mapping relations table between exposure parameter, image brightness and the ambient light illumination of image and preserve.
3. all-weather colorful video camera white balancing treatment method as claimed in claim 1, is characterized in that, goes the infrared step that affects processing to comprise according to current ambient light illumination information and the current infrared light strength information detecting in real time on pending image:
The ambient light illumination information that foundation is current and the current infrared light strength information detecting in real time calculate the ratio of infrared band in ambient light illumination;
According to this ratio, each channel data of pending image is gone to the infrared processing that affects, to reject the impact of infrared light.
4. all-weather colorful video camera white balancing treatment method as claimed in claim 1, is characterized in that, on infraredly affecting the step that processing image that processing obtains carries out white balance correction and comprise through going:
Carry out piecemeal to processing image;
Pick out image block that color approaches grey as candidate's ash piece;
Calculate the color-values of the grey piece of pending image according to candidate's ash piece;
The color-values of the grey piece of the pending image of foundation obtains correction parameter of white balance;
According to the correction parameter of white balance that obtains on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
5. an all-weather colorful video camera white balance processing equipment, is characterized in that, comprising:
The first data acquisition unit, the image luminance information of irradiating the image of material and obtaining this image for gathering Different Light; Obtain ambient light illumination information current in the time taking this image and the exposure parameter information of picture processing chip;
Training unit, for obtain image luminance information and corresponding ambient light illumination information and the exposure parameter information of picture processing chip with it from the first data acquisition unit, and training obtains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image accordingly;
The second data acquisition unit, for the pending image of Real-time Obtaining guarded region, and obtains image luminance information and the current infrared light strength information of this pending image, also obtains current exposure parameter information from picture processing chip simultaneously; Go to the infrared unit that affects, for obtain exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit, and inquire about accordingly described mapping relations table and obtain current ambient light illumination information; And further according to current ambient light illumination information and the infrared light strength information obtaining from the second data acquisition unit, pending image is gone to the infrared processing that affects;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
6. all-weather colorful video camera white balance processing equipment as claimed in claim 5, is characterized in that, described training unit comprises:
Processing unit, for irradiating in Different Light under the environment of material, trains the mapping relations table between exposure parameter, image brightness and the ambient light illumination three who obtains image;
Storage unit, for the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of memory image.
7. all-weather colorful video camera white balance processing equipment as claimed in claim 5, is characterized in that, described in go to the infrared unit that affects to comprise:
Receiving element, for obtaining exposure parameter and the image luminance information corresponding with current pending image from the second data acquisition unit; And for obtaining current infrared light strength information; And be further used for obtaining the mapping relations table between exposure parameter, image brightness and the ambient light illumination three of image from training unit;
Reject the infrared processing unit that affects, be used for inquiring about described mapping relations table according to the exposure parameter corresponding with described pending image and image brightness and obtain current ambient light illumination information, and according to current ambient light illumination information and current infrared light strength information, pending image is gone to the infrared processing that affects.
8. all-weather colorful video camera white balance processing equipment as claimed in claim 7, it is characterized in that, the infrared processing unit that affects of described rejecting goes the infrared step that affects processing to comprise according to current ambient light illumination information and current infrared light strength information on pending image:
Calculate the ratio of infrared band in ambient light illumination according to current ambient light illumination information and current infrared light strength information;
According to this ratio, each channel data of pending image is gone to the infrared processing that affects, to reject the impact of infrared light.
9. all-weather colorful video camera white balance processing equipment as claimed in claim 5, is characterized in that, described white balance correction unit comprises:
Image block unit, for carrying out piecemeal to processing image;
Extract candidate ash module unit, for picking out image block that color approaches grey as candidate's ash piece;
Ash piece determining unit, for calculating the color-values of the grey piece of pending image according to candidate's ash piece;
Correction parameter of white balance determining unit, obtains correction parameter of white balance for the color-values of the grey piece according to pending image;
White balance correction unit, on infraredly affecting the processing image that processing obtains and carry out white balance correction through going.
10. an all-weather colorful video camera, comprise optical lens, imageing sensor, picture processing chip, image transmission module and image display, it is characterized in that, also comprise the all-weather colorful video camera white balance processing equipment as described in claim as arbitrary in claim 5-9.
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