CN104661008B - The treating method and apparatus that color image quality is lifted under low light conditions - Google Patents
The treating method and apparatus that color image quality is lifted under low light conditions Download PDFInfo
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- CN104661008B CN104661008B CN201310578337.6A CN201310578337A CN104661008B CN 104661008 B CN104661008 B CN 104661008B CN 201310578337 A CN201310578337 A CN 201310578337A CN 104661008 B CN104661008 B CN 104661008B
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Abstract
The invention discloses the treating method and apparatus that color image quality under a kind of low-light (level) is lifted, methods described includes：It is periodically switched and is deployed in the infrared fileter before imaging sensor and full impregnated spectral filter, and gathers corresponding infrared filtering image and full impregnated light image in real time；The image color information of the infrared filtering image is obtained, and obtains the image luminance information of the full impregnated light image；Data Fusion is carried out to described image monochrome information and image color information, coloured image is exported.The present invention is deployed in the infrared fileter before imaging sensor and full impregnated spectral filter by being periodically switched, and obtain the monochrome information and color information of low light conditions hypograph respectively by the image gathered successively, the characteristics of then in conjunction with both under low light conditions, synthesize new coloured image, the noise of low light conditions hypograph can be reduced, the brightness of image is lifted simultaneously, so as to obtain the preferable coloured image of quality under low-light (level) environment.
Description
Technical field
The present invention relates to technical field of image processing, lifted in particular to color image quality under a kind of low-light (level)
Treating method and apparatus.
Background technology
DV is generally comprised：Optical lens, imaging sensor, picture processing chip, image transmission module and figure
As display module, wherein, optical lens controls to enter the light of video camera into number, and imaging sensor converts optical signals to electricity again
Signal, recycles picture processing chip to be processed for these electric signals, will be final finally by image transmission module
Obtained signal is transferred in image display and shown.
With the extensive use of monitoring camera machine equipment, people are for the image quality requirements that are obtained under low light conditions
More and more higher.But in natural environment, there is the light of various wavelength, and the range of light wavelengths that generally human eye can be recognized
Between 320nm-760nm, you can see light, and light human eye of other wave-length coverages outside 320nm-760nm can not just be shown in
Arrive, such as infrared light and ultraviolet etc..But the CCD image sensor of video camera（Charge-coupled Device, electric charge
Coupling element imaging sensor）Or CMOS（Complementary Metal Oxide Semiconductor, complementary metal oxygen
Compound semiconductor image sensor）The light of most wavelength can be received, can so cause it in image data acquiring
During add other multi-lights in addition to visible ray, therefore, among practical application, what DV was restored
Actual scene observed by image and human eye may have deviation on color, for example, when imaging sensor can be received
During infrared light, then the color of its output image can be partially red.
In order to solve the problems, such as this colour cast, the solution that prior art is proposed is to increase by an optical filtering before imaging sensor
Piece, to filter out corresponding wave band light, for example, increases by an infrared fileter to filter infrared band, can be by people so as to restore
" realistic colour " that eye is accepted.But, it was found by the inventors of the present invention that the introducing of infrared fileter can be reduced into light quantity, especially
It is under low-light (level) environment, and the brightness of image for not only resulting in output is relatively low, and the noise of output image can also be sharply increased.
General way is at present：Infrared fileter is removed under low-light (level) environment, and uses full impregnated spectral filter to be added to light
Amount, but for the technical scheme, because it uses full impregnated spectral filter, so that adding other wave bands such as infrared light not
Visible ray so that imaging sensor can not show normal coloured image, it can only finally export black white image.
The content of the invention
Have that brightness is low, noise is big to solve the coloured image that video camera is exported under low light conditions in the prior art
Shortcoming, or the problem of be only capable of obtaining black white image by full impregnated spectral filter, the purpose of the embodiment of the present invention is to provide
The treating method and apparatus that color image quality is lifted under a kind of low-light (level).
In order to reach the purpose of the present invention, the embodiment of the present invention is realized using following technical scheme：
The processing method that color image quality is lifted under a kind of low-light (level), including：
A, it is periodically switched and is deployed in the infrared fileter before imaging sensor and full impregnated spectral filter, and in real time
Corresponding infrared filtering image and the full impregnated light image of collection；
B, the image color information for obtaining the infrared filtering image, and obtain the brightness of image of the full impregnated light image
Information；
C, Data Fusion is carried out to described image monochrome information and image color information, export coloured image.
Preferably, the step of image color information for obtaining the infrared filtering image, includes：
B10, the view data that the infrared filtering image is converted to YCbCr format, wherein, the Y refers to infrared filtering
The luminance component of image, Cb refers to the chroma blue component of infrared filtering image, and Cr refers to the red chrominance component of infrared filtering image；
B11, the chroma blue component Cb and red chrominance component Cr for obtaining the YCbCr format view data, and will
It is used as image color information.
Preferably, the step of image luminance information for obtaining the full impregnated light image, includes：
B20, the average brightness Y for obtaining using following mathematical expression the full impregnated light imageavg：
Yavg=Ysum/n；
Wherein, YsumFor the brightness value sum of full impregnated light image all pixels point, n is the pixel number of full impregnated light image；
B21, judge the average brightness YavgWhether in default subject brightness range [Ytarget-Ythd,Ytarget+
Ythd] in, wherein, the YtargetFor preset target brightness value, the YthdTo preset fluctuating error value, if it is, going to step
B24, otherwise, performs next step；
B22, using following mathematical expression, and according to present intensity average value YavgWith target brightness value YtargetDifference set
Adjust step-length fstep：
B23, according to the regulation step-length fstepControl shutter exposure time, image sensor gain, and aperture change
Rate, with the regulation for the full impregnated light image brightness for realizing output, goes to step B20 afterwards；
B24, the acquisition average brightness YavgIn default subject brightness range [Ytarget-Ythd,Ytarget+Ythd] in
Full impregnated light image image luminance information.
Preferably, Data Fusion is carried out to described image monochrome information and image color information, exports cromogram
The step of picture, includes：
C1, described image monochrome information confirmed as to luminance component Y, and combine the blue color included in image color information
Spend the coloured image that component Cb and red chrominance component Cr synthesizes a YCbCr format.
Preferably, after all steps are performed, the processing method that color image quality is lifted under the low-light (level) is also wrapped
Include：
D, to the coloured image carry out white balance correction processing.
The processing unit that color image quality is lifted under a kind of low-light (level), including：
Optical filter handover module, the infrared fileter before imaging sensor and full impregnated are deployed in for being periodically switched
Spectral filter；
Image collection module, for infrared fileter and the filter of full impregnated spectrum to be periodically switched in optical filter handover module
During mating plate, corresponding infrared filtering image and full impregnated light image is gathered in real time；
Acquiring color information module, the image color information for obtaining the infrared filtering image；
Monochrome information acquisition module, the image luminance information for obtaining the full impregnated light image；
Data Fusion module, for being carried out to described image monochrome information and image color information at data fusion
Reason, exports coloured image.
Preferably, the acquiring color information module includes：
First converting unit, the view data for the infrared filtering image to be converted to YCbCr format, wherein, institute
The luminance component that Y refers to infrared filtering image is stated, Cb refers to the chroma blue component of infrared filtering image, and Cr refers to infrared filtering image
Red chrominance component；
Acquiring color information unit, the chroma blue component Cb for obtaining the YCbCr format view data and red
Chroma color component Cr, and as image color information.
Preferably, the monochrome information acquisition module includes：
First computing unit, the average brightness Y for obtaining the full impregnated light image using following mathematical expressionavg：
Yavg=Ysum/n；
Wherein, YsumFor the brightness value sum of full impregnated light image all pixels point, n is the pixel number of full impregnated light image；
Judging unit, for judging the average brightness YavgWhether in default subject brightness range [Ytarget-Ythd,
Ytarget+Ythd] in, wherein, the YtargetFor preset target brightness value, the Ythd is default fluctuating error value, if it is,
Acquiring color information order then is sent to monochrome information acquiring unit, otherwise controls the second computing unit that step-length f is adjustedstep
Calculating；
Second computing unit, for using following mathematical expression, and according to present intensity average value YavgWith target brightness value
YtargetDifference regulation step-length f is setstep：
Adjustment unit, for according to the regulation step-length fstepShutter exposure time, image sensor gain are controlled, and
Aperture rate of change, with the regulation for the full impregnated light image brightness for realizing output, controls the first computing unit to carry out brightness and is averaged afterwards
Value YavgCalculating；
Monochrome information acquiring unit, for obtaining the average brightness Y according to the acquiring color information orderavg
Default subject brightness range [Ytarget-Ythd,Ytarget+Ythd] in full impregnated light image image luminance information.
Preferably, the Data Fusion module includes：
Receiving unit, for obtaining described image monochrome information and image color information；
Fusion treatment unit, for described image monochrome information to be confirmed as into luminance component Y, and combines image color information
In the chroma blue component Cb that includes and red chrominance component Cr synthesize the coloured image of a YCbCr format.
Preferably, the processing unit that color image quality is lifted under the low-light (level) also includes：
White balance processing module, for carrying out white balance correction processing to the coloured image.
The present invention is deployed in the infrared fileter before imaging sensor and full impregnated spectral filtering by being periodically switched
Piece, and the monochrome information and color information of low light conditions hypograph are obtained by the image gathered successively respectively, then in conjunction with
The characteristics of both are under low light conditions synthesize new coloured image, it is possible to reduce the noise of low light conditions hypograph, simultaneously
The brightness of image is lifted, so as to obtain the preferable coloured image of quality under low-light (level) environment.
Brief description of the drawings
The flow signal for the processing method that Fig. 1 is lifted for color image quality under low-light (level) provided in an embodiment of the present invention
Figure；
The structural representation for the processing unit that Fig. 2 is lifted for color image quality under low-light (level) provided in an embodiment of the present invention
Figure.
The realization, functional characteristics and excellent effect of the object of the invention, below in conjunction with specific embodiment and accompanying drawing do into
The explanation of one step.
Embodiment
Technical scheme of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, so that this
The technical staff in field can be better understood from the present invention and can be practiced, but illustrated embodiment is not as the limit to the present invention
It is fixed.
There is colour cast or can not obtain in the image effect obtained for DV in the prior art under low-light (level) environment
Coloured image problem is obtained, in order under low-light (level) environment, obtain the higher coloured image of quality, it is an object of the invention to provide
The processing method that color image quality is lifted under a kind of low-light (level), core concept of the invention is：By periodically to deployment
Infrared fileter and full impregnated spectral filter before imaging sensor are switched by turns, and according under different optical filters
The black white image and coloured image respectively obtained obtain corresponding monochrome information and color information, is gathered twice in conjunction with front and rear
The coloured image that monochrome information and color information are synthesized, in some embodiments it is possible to the coloured image to the output again
White balance correction processing is carried out, the coloured image brightness obtained by the above method is higher, noise is less, can meet actual prison
Control the use requirement of environment.
Specifically, as shown in figure 1, the processing that color image quality is lifted under a kind of low-light (level) provided in an embodiment of the present invention
Method, comprises the following steps：
S10, it is periodically switched and is deployed in the infrared fileter before imaging sensor and full impregnated spectral filter, and in fact
When corresponding infrared filtering image and the full impregnated light image of collection；
S20, the image color information for obtaining the infrared filtering image, and the image of the acquisition full impregnated light image are bright
Spend information；
S30, Data Fusion is carried out to described image monochrome information and image color information, export coloured image.
In the present embodiment, in the step S10, the cycle can be by those skilled in the art according to practical application
Demand and be configured, such as the described cycle can be configured to：Infrared fileter and full impregnated spectral filter were entered in 1 second
25 switchings of row, 25 groups infrared filtering image and full impregnated light image is gathered with this.
In embodiments of the present invention, entered by one group infrared filtering image and the full impregnated light image respectively to front and rear collection
Row processing, after extracting its corresponding color information and monochrome information, then carries out Data Fusion, obtains final output
Coloured image, specifically refer to described below.
Include in the present embodiment, the step of the image color information for obtaining the infrared filtering image：
S201, the view data that the infrared filtering image is converted to YCbCr format；
For the infrared filtering image conversion of rgb format, YCbCr format can be converted into according to following transformational relation
View data：
Y=0.299R+0.587G+0.114B；
Cb=0.564(B-Y)；
Cr=0.713(R-Y)。
Wherein, the Y refers to the luminance component of infrared filtering image, and Cb refers to the chroma blue component of infrared filtering image, Cr
Refer to the red chrominance component of infrared filtering image, the red R component that R, G, B refer respectively to the infrared filtering image of rgb format is strong
Angle value, green G component intensity values, blue B component intensity level.
S202, the chroma blue component Cb and red chrominance component Cr for obtaining the YCbCr format view data, and will
It is used as image color information.
Include in the present embodiment, the step of the image luminance information for obtaining the full impregnated light image：
S203, the average brightness Y for obtaining using following mathematical expression the full impregnated light imageavg：
Yavg=Ysum/n；
Wherein, YsumFor the brightness value sum of full impregnated light image all pixels point, n is the pixel number of full impregnated light image；
S204, judge the average brightness YavgWhether in default subject brightness range [Ytarget-Ythd,Ytarget+
Ythd] in, wherein, the YtargetFor preset target brightness value, the YthdTo preset fluctuating error value, if it is, going to step
S207, otherwise, performs next step；
S205, using following mathematical expression, and according to present intensity average value YavgWith target brightness value YtargetDifference set
Put regulation step-length fstep, wherein, regulation step-length fstepIt is mainly used in regulation shutter exposure time, image sensor gain, and
Aperture rate of change, so that the accuracy and speed of the brightness regulation of image is all controlled in suitable scope：
S206, according to the regulation step-length fstepControl shutter exposure time, image sensor gain, and aperture change
Rate, with the regulation for the full impregnated light image brightness for realizing output, such as, for shutter exposure time exposuretimeCan be according under
Row formula is adjusted：
exposuretime=(1+fstep)exposuretime；
Afterwards, S203 is gone to step；
S207, the acquisition average brightness YavgIn default subject brightness range [Ytarget-Ythd,Ytarget+Ythd] in
Full impregnated light image image luminance information.
In the present embodiment, Data Fusion is carried out to described image monochrome information and image color information, output is color
The step of color image, includes：
S301, described image monochrome information confirmed as to luminance component Y, and combine the blueness included in image color information
Chromatic component Cb and red chrominance component Cr synthesizes the coloured image of a YCbCr format.
In the present embodiment, with continued reference to shown in Fig. 1, after all steps are performed, coloured image matter under the low-light (level)
The processing method of amount lifting also includes：
S40, to the coloured image carry out white balance correction processing.
In the present embodiment, for the white balance correction processing, can by being tested under different low-illumination scenes,
Data under preferable white balance under different-colour are obtained, is then counted and analyzed according to these data again and obtain R/G, B/
Distribution situations of the G under the conditions of different-colour（Presented for example in the form of distribution curve）.
For example, coloured image is divided into multiple small images, the R/G of each pixel in each small images, B/G are calculated
Value, then find out corresponding region in known R/G, B/G distribution curve, wherein, the most region of small images is made
For reference zone, so that R, G, channel B corresponding color gain value Rgain, Bgain, Ggain are obtained, then using following formula, and
According to the R, G, channel B of these yield value correcting colour images, R, G, channel B value R after being correctednew、GnewAnd Bnew。
Rnew=Rgain×R;
Gnew=Ggain×G;
Bnew=Bgain×B。
As shown in Fig. 2 the processing unit that color image quality is lifted under a kind of low-light (level) provided in an embodiment of the present invention, bag
Include：
Optical filter handover module 10, the infrared fileter before imaging sensor is deployed in and complete for being periodically switched
Saturating spectral filter；
Image collection module 20, for infrared fileter and full impregnated spectrum to be periodically switched in optical filter handover module
During optical filter, corresponding infrared filtering image and full impregnated light image is gathered in real time；
Acquiring color information module 30, the image color information for obtaining the infrared filtering image；
Monochrome information acquisition module 40, the image luminance information for obtaining the full impregnated light image；
Data Fusion module 50, for carrying out data fusion to described image monochrome information and image color information
Processing, exports coloured image.
In the present embodiment, the acquiring color information module 30 includes：
First converting unit 301, the view data for the infrared filtering image to be converted to YCbCr format, wherein,
The Y refers to the luminance component of infrared filtering image, and Cb refers to the chroma blue component of infrared filtering image, and Cr refers to infrared filtering image
Red chrominance component；
Acquiring color information unit 302, the chroma blue component Cb for obtaining the YCbCr format view data and
Red chrominance component Cr, and as image color information.
In the present embodiment, the monochrome information acquisition module 40 includes：
First computing unit 401, the average brightness Y for obtaining the full impregnated light image using following mathematical expressionavg：
Yavg=Ysum/n；
Wherein, YsumFor the brightness value sum of full impregnated light image all pixels point, n is the pixel number of full impregnated light image；
Judging unit 402, for judging the average brightness YavgWhether in default subject brightness range [Ytarget-
Ythd,Ytarget+Ythd] in, wherein, the YtargetFor preset target brightness value, the YthdTo preset fluctuating error value, if
It is then to send acquiring color information order to monochrome information acquiring unit 405, otherwise control the second computing unit 403 to be adjusted
Save step-length fstepCalculating；
Second computing unit 403, for using following mathematical expression, and according to present intensity average value YavgWith object brightness
Value YtargetDifference regulation step-length f is setstep：
Adjustment unit 404, for according to the regulation step-length fstepShutter exposure time, image sensor gain are controlled,
And aperture rate of change, with the regulation for the full impregnated light image brightness for realizing output, control the first computing unit 401 to carry out afterwards bright
Spend average value YavgCalculating；
Monochrome information acquiring unit 405, for obtaining the average brightness Y according to the acquiring color information orderavg
In default subject brightness range [Ytarget-Ythd,Ytarget+Ythd] in full impregnated light image image luminance information.
In the present embodiment, the Data Fusion module 50 includes：
Receiving unit 501, for obtaining described image monochrome information and image color information；
Fusion treatment unit 502, for described image monochrome information to be confirmed as into luminance component Y, and combines image color
The chroma blue component Cb and red chrominance component Cr included in information synthesizes the coloured image of a YCbCr format.
In the present embodiment, the processing unit that color image quality is lifted under the low-light (level) also includes：
White balance processing module 60, for carrying out white balance correction processing to the coloured image.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, be included within the scope of the present invention.
Claims (8)
1. the processing method that color image quality is lifted under a kind of low-light (level), it is characterised in that including：
A, it is periodically switched and is deployed in the infrared fileter before imaging sensor and full impregnated spectral filter, and gathers in real time
Corresponding infrared filtering image and full impregnated light image；
B, the image color information for obtaining the infrared filtering image, and obtain the brightness of image letter of the full impregnated light image
Breath；
C, Data Fusion is carried out to described image monochrome information and image color information, export coloured image；
Wherein, the step of image luminance information of the acquisition full impregnated light image includes：
B20, the average brightness Y for obtaining using following mathematical expression the full impregnated light imageavg：
Yavg=Ysum/n；
Wherein, YsumFor the brightness value sum of full impregnated light image all pixels point, n is the pixel number of full impregnated light image；
B21, judge the average brightness YavgWhether in default subject brightness range [Ytarget-Ythd,Ytarget+Ythd] in,
Wherein, the YtargetFor preset target brightness value, the YthdTo preset fluctuating error value, if it is, B24 is gone to step, it is no
Then, next step is performed；
B22, using following mathematical expression, and according to present intensity average value YavgWith target brightness value YtargetDifference set regulation
Step-length fstep：
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B23, according to the regulation step-length fstepShutter exposure time, image sensor gain, and aperture rate of change are controlled, with
The regulation of the full impregnated light image brightness of output is realized, B20 is gone to step afterwards；
B24, the acquisition average brightness YavgIn default subject brightness range [Ytarget-Ythd,Ytarget+Ythd] in it is complete
The image luminance information of printing opacity image.
2. the processing method that color image quality is lifted under low-light (level) as claimed in claim 1, it is characterised in that obtain described
The step of image color information of infrared filtering image, includes：
B10, the view data that the infrared filtering image is converted to YCbCr format, wherein, the Y refers to infrared filtering image
Luminance component, Cb refers to the chroma blue component of infrared filtering image, and Cr refers to the red chrominance component of infrared filtering image；
B11, the chroma blue component Cb and red chrominance component Cr for obtaining the YCbCr format view data, and made
For image color information.
3. the processing method that color image quality is lifted under low-light (level) as claimed in claim 1 or 2, it is characterised in that to institute
State image luminance information and image color information carries out Data Fusion, the step of exporting coloured image includes：
C1, the chroma blue for confirming as described image monochrome information to include in luminance component Y, and combination image color information divide
Measure the coloured image that Cb and red chrominance component Cr synthesizes a YCbCr format.
4. the processing method that color image quality is lifted under low-light (level) as claimed in claim 1, it is characterised in that performing institute
After having a step, in addition to：
D, to the coloured image carry out white balance correction processing.
5. the processing unit that color image quality is lifted under a kind of low-light (level), it is characterised in that including：
Optical filter handover module, the infrared fileter before imaging sensor and full impregnated spectrum are deployed in for being periodically switched
Optical filter；
Image collection module, for infrared fileter and full impregnated spectral filter to be periodically switched in optical filter handover module
When, corresponding infrared filtering image and full impregnated light image is gathered in real time；
Acquiring color information module, the image color information for obtaining the infrared filtering image；
Monochrome information acquisition module, the image luminance information for obtaining the full impregnated light image；
Data Fusion module, for carrying out Data Fusion to described image monochrome information and image color information,
Export coloured image；
Wherein, the monochrome information acquisition module includes：
First computing unit, the average brightness Y for obtaining the full impregnated light image using following mathematical expressionavg：
Yavg=Ysum/n；
Wherein, YsumFor the brightness value sum of full impregnated light image all pixels point, n is the pixel number of full impregnated light image；
Judging unit, for judging the average brightness YavgWhether in default subject brightness range [Ytarget-Ythd,
Ytarget+Ythd] in, wherein, the YtargetFor preset target brightness value, the YthdTo preset fluctuating error value, if it is,
Acquiring color information order is sent to monochrome information acquiring unit, otherwise controls the second computing unit that step-length f is adjustedstep's
Calculate；
Second computing unit, for using following mathematical expression, and according to present intensity average value YavgWith target brightness value Ytarget
Difference regulation step-length f is setstep：
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Adjustment unit, for according to the regulation step-length fstepControl shutter exposure time, image sensor gain, and aperture
Rate of change, with the regulation for the full impregnated light image brightness for realizing output, controls the first computing unit to carry out average brightness Y afterwardsavg
Calculating；
Monochrome information acquiring unit, for obtaining the average brightness Y according to the acquiring color information orderavgDefault
Subject brightness range [Ytarget-Ythd,Ytarget+Ythd] in full impregnated light image image luminance information.
6. the processing unit that color image quality is lifted under low-light (level) as claimed in claim 5, it is characterised in that the color
Data obtaining module includes：
First converting unit, the view data for the infrared filtering image to be converted to YCbCr format, wherein, the Y refers to
The luminance component of infrared filtering image, Cb refers to the chroma blue component of infrared filtering image, and Cr refers to the red of infrared filtering image
Chromatic component；
Acquiring color information unit, the chroma blue component Cb for obtaining the YCbCr format view data and red color
Component Cr is spent, and as image color information.
7. the processing unit that color image quality is lifted under the low-light (level) as described in claim 5 or 6, it is characterised in that described
Data Fusion module includes：
Receiving unit, for obtaining described image monochrome information and image color information；
Fusion treatment unit, is wrapped for described image monochrome information to be confirmed as into luminance component Y, and combined in image color information
The chroma blue component Cb and red chrominance component Cr contained synthesizes the coloured image of a YCbCr format.
8. the processing unit that color image quality is lifted under low-light (level) as claimed in claim 5, it is characterised in that also include：
White balance processing module, for carrying out white balance correction processing to the coloured image.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310578337.6A CN104661008B (en) | 2013-11-18 | 2013-11-18 | The treating method and apparatus that color image quality is lifted under low light conditions |
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| CN201310578337.6A CN104661008B (en) | 2013-11-18 | 2013-11-18 | The treating method and apparatus that color image quality is lifted under low light conditions |
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| Publication Number | Publication Date |
|---|---|
| CN104661008A CN104661008A (en) | 2015-05-27 |
| CN104661008B true CN104661008B (en) | 2017-10-31 |
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