CN108846803A - A kind of color rendition method based on yuv space - Google Patents
A kind of color rendition method based on yuv space Download PDFInfo
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- 238000004364 calculation method Methods 0.000 claims abstract description 8
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- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000000007 visual effect Effects 0.000 abstract description 3
- 238000004422 calculation algorithm Methods 0.000 description 8
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
Abstract
The present invention provides a kind of color rendition methods based on yuv space, include the following steps：Input picture-power consumption limit-histogram translates-exports image.The present invention independently realizes power consumption limit and color rendition, due to that will not cause color distortion during realizing power consumption limit, during realizing color rendition, not will lead to brightness change for no reason, substantially increases the performance of color rendition；Selective power consumption limit method based on the channel Y alleviates the contradiction reduced between power consumption and promotion visual effect；It is translated by UV histogram and realizes color rendition, due to only needing plus and minus calculation in translation motion, do not need the more complicated operation such as multiplication and division, the hardware-implemented cost of institute is reduced.
Description
Technical field
The present invention relates to a kind of color rendition methods based on yuv space, belong to field of image enhancement and consumer electronics
Technical field.
Background technique
Color rendition is one of common image enhancement technique, and object color seen by person is the true face of object
Color, color observed by human eye are not influenced by ambient light, and this phenomenon is called color constancy.But if without
The processing of color rendition method is crossed, image captured by camera will be affected by ambient light, and will generate colour cast.For example,
In the case that blue light is environment light, image will generate blue colour cast.Although traditional color rendition algorithm has reached color rendition
Effect, but color rendition performance is to be improved.
In addition, concern of the power problems increasingly by industrial circle and academia, present smart phone are general there are one
All over problem, that is, stand-by time is short.To find out its cause, being since screen end image shows that power consumption is larger.According to statistics, in intelligent hand
In the common consumer electronics product such as machine, tablet computer, image the power consumption of screen end display consumption account for the 50% of total power consumption with
On.
In order to solve the problems, such as this color rendition, many documents and patent propose related algorithm, such as document [R
Lukac.:New framework for automatic white balancing of digital camera
Images.Signal Processing.Vis.88 (3), 582-593 (2008)] in use gray world algorithm, this calculation
Algorithm fails when method encounters color single object；Document [Radu Ciprian Bilcu.:Multiframe Auto White
Balance.Signal Processing Letters, IEEE.Vis 18 (3), 165-168 (2011)] in white patch calculate
Method, encountering does not have the case where white area in image, algorithm failure；Such as application No. is 201610663149.7 Chinese patent public affairs
A kind of color rendition method based on histogram translation opened, which is that color rendition is realized on rgb space, is being counted
R, on the basis of G, B three channel histogram, using wherein some histogram as benchmark, other two histogram is translated to it, real
Existing color rendition, still, the translation of R, G, B three channel histogram will bring the large change of brightness, it is difficult to and keep brightness constant,
And any technology for being related to yuv space and restoring color is absolutely not mentioned in the patent；For another example Patent No.
A kind of color rendition method and device disclosed in 201410090284.8 Chinese patent, the patent are also real on rgb space
Existing color rendition, on the basis of counting R, G, B three channel histogram, using wherein some histogram as benchmark, in addition two
A histogram is matched to it, realizes color rendition, histogram matching operating process is complex, needs first to count some
The corresponding histogram cumulative area of grayscale, then 0-255 range find new histogram in it is big with above-mentioned area matched grayscale
Small, whole process will take a substantial amount of time, and efficiency of algorithm is to be improved.In addition, these traditional algorithm power consumptions are very big, hardware
That realizes is at high cost.
Summary of the invention
In order to solve the above technical problems, this is based on the present invention provides a kind of color rendition method based on yuv space
The color rendition method of yuv space is low in energy consumption, and can improve color rendition performance, to solve the power problems of color rendition.
The present invention is achieved by the following technical programs.
A kind of color rendition method based on yuv space provided by the invention, includes the following steps：
1. input picture：Input tape has the image of colour cast, by conversion formula, it is converted to YUV from RGB channel and is led to
Road；
2. power consumption limit：The channel Y in the channel YUV is subjected to power consumption limit；
3. histogram translates：The channel UV in the channel YUV is subjected to histogram translation；
4. exporting image：The channel YUV is converted back into RGB channel, obtains output image.
1. the step is divided into following steps：
(1.1) grayscale of R, G, B are obtained from each pixel unit of the image with colour cast；
(1.2) according to conversion formula, the image with colour cast is converted into yuv format image.
The conversion formula is：
Wherein, Y is luminance component, and U and V are color difference components, and G is green component, and B is blue component, and R is red component.
2. the step is divided into following steps：
(2.1) the luminance component Y in the channel Y is obtained；
(2.2) average brightness Y is calculated with luminance component Yav；
(2.3) scanning strip has the luminance component Y of each pixel unit in colour cast imaget；
(2.4) if luminance component YtLess than average brightness Yav, pixel unit is not handled, otherwise carries out power consumption limit
System, obtains new luminance component Y '.
The average brightness YavCalculation formula it is as follows：
Wherein, M is horizontal resolution, and N is vertical resolution ratio, and Y is luminance component.
The power consumption limit is divided into following steps：
(2.4.1) calculates intensity deviation amount Yoffset：
Wherein, YtFor the luminance component with each pixel unit in colour cast image, YavFor average brightness, YmaxFor the channel Y
In maximum brightness component, K is adjustment factor；
(2.4.2) adjusts intensity deviation amount Y by selecting the size of KoffsetSize, K is bigger, the journey of power consumption limit
It spends smaller.
The calculation formula of the new luminance component Y ' is as follows：
Y '=Yt-Yoffset；
Wherein, YtFor the luminance component with each pixel unit in colour cast image, YoffsetFor intensity deviation amount.
3. the step is divided into following steps：
(3.1) the average value U of UV channel histogram and U component is obtainedav, V component average value Vav；
(3.2) particular point is chosen, on the basis of particular point, histogram translation, the grayscale of the particular point are carried out to the channel UV
Value range is [16,239].
The histogram translation is one of following several translations：
A. toward big translation：If Uav> Vav, U histogram remains unchanged and as translation references, and V histogram is to U histogram
Translation, translational movement Uav-Vav, it otherwise being remained unchanged using V histogram and as translation references, U histogram is translated to V histogram,
Translational movement is Vav-Uav；
B. toward small translation：If Uav> Vav, V histogram remains unchanged and as translation references, and U histogram is to V histogram
Translation, translational movement Uav-Vav, it otherwise being remained unchanged using U histogram and as translation references, V histogram is translated to U histogram,
Translational movement is Vav-Uav；
C. it is translated toward centre：Calculate the midpoint mid=0.5 (V of UV histogramav+Uav), on the basis of this midpoint, UV is straight
Square figure is translated to it.
D. it is translated toward special value：The a certain numerical value between 16 to 239 is chosen as datum mark, U histogram and V histogram
Toward the point translation.
The step 4. in, be by the formula that the channel YUV converts back RGB channel：
Wherein, Y is luminance component, and U and V are color difference components, and G is green component, and B is blue component, and R is red component.
The beneficial effects of the present invention are：
(1) power consumption limit and color rendition are independently realized：By handling the channel Y of original image, realizes power consumption limit, pass through
The channel UV of original image is handled, realizes color rendition；Since color distortion will not be caused during realizing power consumption limit, in reality
During existing color rendition, it not will lead to brightness change for no reason, substantially increase the performance of color rendition；
(2) based on the high image quality power consumption limit in the channel Y:Selective power consumption limit method based on the channel Y alleviates reduction
Contradiction between power consumption and promotion visual effect；
(3) color rendition is realized by the translation of UV histogram：First count UV histogram, then the side translated by histogram
Method realizes that color rendition does not need the more complicated operation such as multiplication and division, so firmly due to only needing plus and minus calculation in translation motion
The cost that part is realized is reduced.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the grayscale image of the image with colour cast；
Fig. 3 is the Y channel histogram of Fig. 2；
Fig. 4 is that the image with colour cast carries out the grayscale image after power consumption limit；
Fig. 5 is the Y channel histogram of Fig. 4；
Fig. 6 is the UV histogram of the image with colour cast；
Fig. 7 is the UV histogram by the present invention treated image.
Specific embodiment
Be described further below technical solution of the present invention, but claimed range be not limited to it is described.
As described in Figure 1, a kind of color rendition method based on yuv space, includes the following steps：
1. input picture：Input tape has the image of colour cast, obtains from each pixel unit of the image with colour cast
R, it is converted to the channel YUV from RGB channel by conversion formula by the grayscale of G, B；The conversion formula is：
Wherein, Y is luminance component, and U and V are color difference components, and G is green component, and B is blue component, and R is red component；
2. power consumption limit：The channel Y in the channel YUV is subjected to power consumption limit, the luminance component Y in the channel Y is obtained first, uses
Luminance component Y calculates average brightness Yav, scanning strip has the luminance component Y of each pixel unit in colour cast image latertIf bright
Spend component YtLess than average brightness Yav, illustrate the luminance component of the pixel unit in average brightness hereinafter, at this moment in order to keep scheming
As information, pixel unit is not handled, otherwise illustrate the luminance component of the pixel unit more than average brightness, the pixel
Unit can cause biggish display power consumption, it is therefore desirable to carry out power consumption limit, obtain new luminance component Y '；The average brightness
YavCalculation formula it is as follows：
Wherein, M is horizontal resolution, and N is vertical resolution ratio, and Y is luminance component；
The calculation formula of the new luminance component Y ' is as follows：
Y '=Yt-Yoffset；
Wherein, YtFor the luminance component with each pixel unit in colour cast image, YoffsetFor intensity deviation amount；
Further, the power consumption limit is divided into following steps：
(1) intensity deviation amount Y is calculatedoffset：
Wherein, YtFor the luminance component with each pixel unit in colour cast image, YavFor average brightness, YmaxFor the channel Y
In maximum brightness component, K is adjustment factor, the value of K is 2,3,4,5,6,7,8,9,10, K it is bigger, then the journey of power consumption limit
Spend smaller, image information loss is also smaller；
(2) intensity deviation amount Y is adjusted by selecting the size of KoffsetSize, K is bigger, and the degree of power consumption limit is got over
It is small.
3. histogram translates：By in the channel YUV the channel UV carry out histogram translation, first acquisition UV channel histogram with
And the average value U of U componentav, V component average value Uav, particular point is then chosen, on the basis of particular point, the channel UV is carried out
Histogram translation, the grayscale value range of the particular point are [16,239]；
Further, the histogram translation is one of following several translations：
A. toward big translation：If Uav> Vav, U histogram remains unchanged and as translation references, and V histogram is to U histogram
Translation, translational movement Uav-Vav, it otherwise being remained unchanged using V histogram and as translation references, U histogram is translated to V histogram,
Translational movement is Vav-Uav；
B. toward small translation：If Uav> Vav, V histogram remains unchanged and as translation references, and U histogram is to V histogram
Translation, translational movement Uav-Vav, it otherwise being remained unchanged using U histogram and as translation references, V histogram is translated to U histogram,
Translational movement is Vav-Uav；
C. it is translated toward centre：Calculate the midpoint mid=0.5 (V of UV histogramav+Uav), on the basis of this midpoint, UV is straight
Square figure is translated to it.
D. it is translated toward special value：The a certain numerical value between 16 to 239 is chosen as datum mark, U histogram and V histogram
Toward the point translation.
4. exporting image：The channel YUV is converted back into RGB channel, obtains output image, formula is：
Wherein, Y is luminance component, and U and V are color difference components, and G is green component, and B is blue component, and R is red component.
Further, after power consumption limit, as shown in Figure 2-5, high gray partial pixel number is substantially reduced, display
Power consumption is effectively limited；After histogram translates, as shown in Figure 6 and Figure 7, the lap of UV histogram increases, effectively
Realize color rendition.
Embodiment
As described above, from R, G and B histogram overlapping area OA, luminance differenceAnd it judges in terms of power consumption PD tri-
The effect of color rendition, OA is bigger, and color rendition effect is better,Smaller color rendition effect is better, the smaller color rendition of PD
Effect is better.
By handling 20 width images, obtained OA value is shown in Table 1：
Table 1 is compared with traditional algorithm
The above are to the result obtained after 11 width image procossings, it is seen then that compared to GW, WP, HM, better effect of the present invention,
The average value of its OA is respectively than GW and WP high 17.8% and 50.1%, histogram overlapping area suitable with HM therefore of the invention
Larger, color rendition performance is excellent；AndAverage value lower than GW, WP and HM 44.8%, 70.0% and 55.6% respectively, phase
Than in original image, the brightness change of present invention processing gained image is minimum, hardly influences the light characteristic of image；Last function
Consume average value lower than GW, WP and HM 20.7%, 44.2% and 2.7% respectively of PD, it can be seen that the display power consumption that the present invention generates
It is low, it is suitable for the display driving of panel, is optimal according to above-mentioned, of the invention color rendition effect.
In conclusion the present invention is based on UV histograms to translate the method for realizing color rendition, low-power consumption is realized in yuv space
Power consumption limit and color rendition independent process since the two is independent of each other, are improved performance by color rendition, also in the channel Y reality
Selective current limit is showed, wherein an adjustability coefficients K is added, has reached at the compromise between power consumption and visual effect
Reason.
Claims (10)
1. a kind of color rendition method based on yuv space, it is characterised in that：Include the following steps：
1. input picture：Input tape has the image of colour cast, and by conversion formula, it is converted to the channel YUV from RGB channel；
2. power consumption limit：The channel Y in the channel YUV is subjected to power consumption limit；
3. histogram translates：The channel UV in the channel YUV is subjected to histogram translation；
4. exporting image：The channel YUV is converted back into RGB channel, obtains output image.
2. as described in claim 1 based on the color rendition method of yuv space, it is characterised in that：The step be 1. divided into
Lower step：
(1.1) grayscale of R, G, B are obtained from each pixel unit of the image with colour cast；
(1.2) according to conversion formula, the image with colour cast is converted into yuv format image.
3. as claimed in claim 2 based on the color rendition method of yuv space, it is characterised in that：The conversion formula is：
Wherein, Y is luminance component, and U and V are color difference components, and G is green component, and B is blue component, and R is red component.
4. as described in claim 1 based on the color rendition method of yuv space, it is characterised in that：The step be 2. divided into
Lower step：
(2.1) the luminance component Y in the channel Y is obtained；
(2.2) average brightness Y is calculated with luminance component Yav；
(2.3) scanning strip has the luminance component Y of each pixel unit in colour cast imaget；
(2.4) if luminance component YtLess than average brightness Yav, pixel unit is not handled, otherwise carries out power consumption limit,
Obtain new luminance component Y '.
5. as claimed in claim 4 based on the color rendition method of yuv space, it is characterised in that：The average brightness Yav's
Calculation formula is as follows：
Wherein, M is horizontal resolution, and N is vertical resolution ratio, and Y is luminance component.
6. as claimed in claim 4 based on the color rendition method of yuv space, it is characterised in that：The power consumption limit is divided into
Following steps：
(2.4.1) calculates intensity deviation amount Yoffset：
Wherein, YtFor the luminance component with each pixel unit in colour cast image, YavFor average brightness, YmaxFor in the channel Y
Maximum brightness component, K are adjustment factor；
(2.4.2) adjusts intensity deviation amount Y by selecting the size of KoffsetSize, K is bigger, and the degree of power consumption limit is got over
It is small.
7. as claimed in claim 4 based on the color rendition method of yuv space, it is characterised in that：The new luminance component
The calculation formula of Y ' is as follows：
Y '=Yt-Yoffset；
Wherein, YtFor the luminance component with each pixel unit in colour cast image, YoffsetFor intensity deviation amount.
8. as described in claim 1 based on the color rendition method of yuv space, it is characterised in that：The step be 3. divided into
Lower step：
(3.1) the average value U of UV channel histogram and U component is obtainedav, V component average value Vav；
(3.2) particular point is chosen, on the basis of particular point, histogram translation, the grayscale value of the particular point are carried out to the channel UV
Range is [16,239].
9. as claimed in claim 8 based on the color rendition method of yuv space, it is characterised in that：The histogram translates
One of several translations below：
A. toward big translation：If Uav> Vav, U histogram remains unchanged and as translation references, and V histogram is translated to U histogram,
Translational movement is Uav-Vav, otherwise remained unchanged using V histogram and as translation references, U histogram is translated to V histogram, translation
Amount is Vav-Uav；
B. toward small translation：If Uav> Vav, V histogram remains unchanged and as translation references, and U histogram is translated to V histogram,
Translational movement is Uav-Vav, otherwise remained unchanged using U histogram and as translation references, V histogram is translated to U histogram, translation
Amount is Vav-Uav；
C. it is translated toward centre：Calculate the midpoint mid=0.5 (V of UV histogramav+Uav), on the basis of this midpoint, UV histogram
It is translated to it.
D. it is translated toward special value：Choose a certain numerical value between 16 to 239 and be used as datum mark, U histogram and V histogram toward this
Point translation.
10. as described in claim 1 based on the color rendition method of yuv space, it is characterised in that：The step 4. in, will
The formula that the channel YUV converts back RGB channel is：
Wherein, Y is luminance component, and U and V are color difference components, and G is green component, and B is blue component, and R is red component.
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Application publication date: 20181120 |