CN107918928A - A kind of color rendition method - Google Patents
A kind of color rendition method Download PDFInfo
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- CN107918928A CN107918928A CN201711105566.0A CN201711105566A CN107918928A CN 107918928 A CN107918928 A CN 107918928A CN 201711105566 A CN201711105566 A CN 201711105566A CN 107918928 A CN107918928 A CN 107918928A
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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
- G06T5/00—Image enhancement or restoration
- G06T5/40—Image enhancement or restoration by the use of histogram techniques
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10024—Color image
Abstract
The present invention provides a kind of color rendition method, comprises the following steps：Input original image；The grey decision-making of all pixels point of original image is multiplied by power constraint coefficient k；On the basis of the gray scale histogram for taking image Green passage, the gray scale histogram of red, blue channel gray scale histogram towards green channel is translated and drawn close；Establish compensation section, pixel of the grey decision-making in original image in compensation section is sampled, keep the grey decision-making of sampled pixel point constant, the grey decision-making for compensating rest of pixels point in section is translated by histogram translation algorithm, obtains the compensation of high gray area of absence pixel；Output image.The color rendition method of the present invention can be efficiently there will be the image progress color rendition processing of colour cast, while disclosure satisfy that requirement of the AMOLED display screens for low-power consumption；Used in algorithm be plus, subtraction, compared to using a large amount of multiplication and division methods traditional algorithm, have more low-power consumption, be easier to hardware realization, greatly reduce the complexity of algorithm.
Description
Technical field
The present invention relates to image processing field, more particularly to a kind of color rendition method.
Background technology
During the picture of AMOLED display screens is shown, color rendition, i.e. automatic white balance (Automatic White
Balance, AWB), it is a highly important function.
Color rendition algorithm is for correcting the important method recovered there are colour cast image, being widely used in various each
Among the digital equipment of sample.Under the irradiation of a variety of light sources, i.e., under different-colour, the color of target object will become
Change.It is seen that such a rule：Colour temperature is higher, photochromic more blue；Colour temperature is lower, it is photochromic will be more partially red.Wherein, in vain
The change of color object is the most notable.In order to reduce the target object color distortion as caused by light source and outside contamination as far as possible,
Color rendition algorithm needs to carry out colour correction to filmed image, to achieve the purpose that closest to preferable picture.
The most traditional algorithms using a large amount of multiplication and division methods of color rendition algorithm that some existing documents and patent propose,
Power consumption is high and is not easy to hardware realization.In daily life, we can also have found the mobile equipment very power consumption in hand, and move
The power consumption of product is mainly derived from screen display.Therefore, original image histogram how is efficiently handled so as to reach white balance
The power consumption that AMOLED display screens can be reduced while effect again is current urgent need problem to be solved.
The content of the invention
In view of the foregoing deficiencies of prior art, it is an object of the invention to provide a kind of color rendition method, it is used for
Solution handheld device power consumption is high, existing color rendition algorithm power consumption is high, is not easy to hardware realization and color rendition inefficient
The problem of.To achieve the above object, the present invention uses following scheme：A kind of color rendition method, suitable for AMOLED display screens,
The color rendition method includes at least：Input original image；The grey decision-making of all pixels point of original image is multiplied by power beam
Coefficient k is tied up, to limit image display power, wherein, k ∈ (0,1)；On the basis of the gray scale histogram for taking image Green passage,
The red gray scale histogram with gray scale histogram towards the green channel of blue channel is translated and drawn close, to increase overlapping area；
Compensation section is established, pixel of the grey decision-making in original image in compensation section is sampled according to its coordinate numbering, is sampled
Time interval is T, and the grey decision-making of sampled pixel point remains unchanged, and the grey decision-making for compensating rest of pixels point in section is put down by histogram
Move algorithm to be translated, to obtain the compensation of high gray area of absence pixel；Output image.
In one embodiment of the present invention, obtain power constraint coefficient k and include at least following steps：R, G are obtained respectively
With the grey decision-making summation of tri- kinds of Color Channels of B；The grey decision-making summation of tri- kinds of Color Channels of R, G and B is divided by two-by-two, draws three
Coefficient, wherein, using the greater as denominator, using smaller as molecule in each coefficient；Power is used as using the maximum in three coefficients
Fetter coefficient k.
In one embodiment of the present invention, the red grayscale Nogata with the gray scale histogram of blue channel to green channel
Figure translation motion includes：The grey scale average value of tri- kinds of Color Channels of R, G and B is obtained respectively；Respectively by red, blue channel grayscale
It is poor that the grey scale average value of average value and green channel is made, and the difference of red channel and the grey scale average value of green channel is denoted as the
The difference of the grey scale average value of one grayscale difference, blue channel and green channel is denoted as the second grayscale difference；Keep all pixels
The grey decision-making of point green channel is constant；It is poor that the grey decision-making of red channel and the first grayscale difference are made, and obtains red channel
New gray value；It is poor that the grey decision-making of blue channel and the second grayscale difference are made, and obtains the new grey decision-making of blue channel.
In one embodiment of the present invention, establishing the step of compensating section includes：With the grey scale average value of green channel
On the basis of, it is poor that red and blue channel grey scale average value is made with the grey scale average value of green channel respectively, by red channel
The 3rd grayscale difference is denoted as with the difference of the grey scale average value of green channel, the grey scale average value of blue channel and green channel
Difference is denoted as the 4th grayscale difference；End point values of the grayscale maximum of red channel as red channel compensation section are taken, take indigo plant
End point values of the grayscale maximum of chrominance channel as blue channel compensation section；By the grayscale maximum of red channel and described the
It is poor that three grayscale differences are made, and obtains the initial value in red channel compensation section；By the grayscale maximum of blue channel and the described 4th
It is poor that grayscale difference is made, and obtains the initial value in blue channel compensation section；Then red channel compensation section is expressed as：dR=[Rmax
(x,y)-(Ravg-Gavg), Rmax(x, y)], wherein, dRSection, R are compensated for red channelmax(x, y) is the grayscale of red channel
Maximum, RavgFor the grey scale average value of red channel, GavgFor the grey scale average value of green channel；Blue channel compensates interval table
It is shown as：dB=[Bmax(x,y)-(Bavg-Gavg), Bmax(x, y)], wherein, dBSection, B are compensated for blue channelmax(x, y) is indigo plant
The grayscale maximum of chrominance channel, BavgFor the grey scale average value of blue channel.
In one embodiment of the present invention, to the time of pixel point sampling of the grey decision-making in original image in compensation section
The value range for being spaced T is 3-5.
In one embodiment of the present invention, the color rendition method is based on programmable logic device FPGA and AMOLED
The association system of display screen is realized.
As described above, the color rendition method of the present invention, has the advantages that：
1st, image that can be efficiently there will be colour cast carries out color rendition processing, obtains being similar under the irradiation of normal light source
Image；
2nd, it disclosure satisfy that requirement of the AMOLED display screens to low-power consumption；
3rd, largely used in algorithm be plus, subtraction, compared to using a large amount of multiplication and division methods traditional algorithm, have it is lower
Power consumption, be easier to hardware realization, greatly reduces the complexity of algorithm.
Brief description of the drawings
Fig. 1 is shown as the flow diagram of color rendition method of the present invention.
Fig. 2 is shown as the gray scale histogram of original image blue channel.
Fig. 3 is shown as the gray scale histogram of image blue channel after being handled through histogram translation algorithm.
Fig. 4 is shown as the gray scale histogram of image blue channel after addition compensation mechanism.
Component label instructions
S1-S5 steps
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that in the case where there is no conflict, following embodiments and implementation
Feature in example can be mutually combined.
It should be noted that the diagram provided in following embodiments only illustrates the basic structure of the present invention in a schematic way
Think, though component count, shape and size when only display is with related component in the present invention rather than according to actual implementation in diagram
Draw, kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout kenel
It is likely more complexity.
The color rendition method of the present invention can be on the association system of programmable logic device FPGA and AMOLED display screens
Realize.Referring to Fig. 1, the flow diagram for color rendition method of the present invention.The color rendition method includes at least following
Step：
S1, equipment initialization, input original image；
S2, image display power limit：The grey decision-making of all pixels point of original image is multiplied by power constraint coefficient k,
To limit image display power, wherein, k ∈ (0,1), here, power constraint are the laggard of image input as preprocessing part
The capable first step, and the important embodiment of power consumption is reduced in algorithm；
S3, gray scale histogram translation：On the basis of the gray scale histogram for taking image Green passage, by red and blue channel
The gray scale histogram of gray scale histogram towards green channel translate and draw close, for increasing overlapping area；
S4, the compensation of high gray area of absence pixel：Compensation section is established, compensation section is sitting in grey decision-making in original image
Interior pixel is sampled according to its coordinate numbering, and sampling time interval T, the grey decision-making of sampled pixel point remains unchanged,
The grey decision-making of rest of pixels point is translated by histogram translation algorithm in compensation section, to obtain high gray area of absence pixel
The compensation of point；
Image after S5, output processing.
For AMOLED display screens, it is very crucial to reduce power consumption.In order to extend the service life of AMOLED display screens
And the usage time of supporting electronic equipment, in the case where not appreciably affecting its display effect, control its display power consumption
It is very important.Power constraint refers to sacrifice a small amount of image color vividness, to reach the method for significantly reducing power consumption.Will
The grey decision-making of all pixels point of original image is multiplied by a coefficient k, which be calculated according to the data of input picture
, and ensure k ∈ (0,1).
As an example, obtain comprising the following steps that for power constraint coefficient k：
1) the grey decision-making summation of tri- kinds of Color Channels of R, G and B is obtained respectively；
2) the grey decision-making summation of tri- kinds of Color Channels of R, G and B is divided by two-by-two, draws three coefficients, wherein, in each coefficient
Using the greater as denominator, using smaller as molecule；
3) power constraint coefficient k is used as using the maximum in three coefficients.
It should be noted that power constraint is as preprocessing part, it is the first step that image input carries out afterwards, and calculate
The important embodiment of power consumption is reduced in method.
Gray scale histogram translation is exactly on the basis of taking the gray scale histogram of green channel, by the red grayscale with blue channel
Histogram is drawn close towards it, to achieve the purpose that to increase overlapping area, obtains more preferable color rendition effect.
In an embodiment, gray scale histogram translation comprises the following steps that：
1) grey scale average value of tri- kinds of Color Channels of R, G and B is obtained respectively；
2) it is poor respectively to make red, blue channel grey scale average value and the grey scale average value of green channel, by red channel
The first grayscale difference is denoted as with the difference of the grey scale average value of green channel, the grey scale average value of blue channel and green channel
Difference is denoted as the second grayscale difference；
3) keep the grey decision-making of all pixels point green channel constant；By the grey decision-making of red channel and first grayscale
It is poor that difference is made, and obtains the new gray value of red channel；It is poor that the grey decision-making of blue channel and the second grayscale difference are made, and obtains
The new grey decision-making of blue channel.
During algorithm process, due to the passage compared to green channel average bigger, it will subtract a difference
Achieve the purpose that closer to green channel, therefore in high gray part, one piece of region will be vacated, which will in this region
There is no any pixel, while high gray part can more significantly influence the display effect of image compared to low grey exponent part.
By taking blue channel (assuming that average is more than green channel) as an example, the gray scale histogram and warp of original image blue channel are straight
The gray scale histogram of image blue channel is distinguished as shown in Figures 2 and 3 after square figure translation algorithm processing, it should be noted that
Abscissa in Fig. 2-Fig. 4 represents grey decision-making, and ordinate represents the ratio that grey decision-making accounts for the total grey decision-making of entire image.By right
Than finding with being apparent from because to left and the high gray area of absence that occurs.This has been indicated that by histogram
Image after translation algorithm is no any pixel in very big one piece of region of blue channel high gray, this may lead
Image after cause processing is less full in the color of high bright part.Therefore, in order to solve this problem, be to high gray vacancy
Area pixel point compensates.
First have to establish compensation section, comprise the following steps：
1) on the basis of the grey scale average value of green channel, by red and blue channel grey scale average value respectively with green
It is poor that the grey scale average value of passage is made, and the difference of red channel and the grey scale average value of green channel is denoted as the 3rd grayscale difference,
The difference of the grey scale average value of blue channel and green channel is denoted as the 4th grayscale difference；
2) end point values of the grayscale maximum of red channel as red channel compensation section are taken, take the grayscale of blue channel
End point values of the maximum as blue channel compensation section；
3) it is poor to make the grayscale maximum of red channel and the 3rd grayscale difference, obtains red channel compensation section
Initial value；It is poor that the grayscale maximum of blue channel and the 4th grayscale difference are made, and obtains the first of blue channel compensation section
Initial value；
4) then red channel compensation section is expressed as：
dR=[Rmax(x,y)-(Ravg-Gavg), Rmax(x, y)], wherein, dRSection, R are compensated for red channelmax(x, y) is
The grayscale maximum of red channel, RavgFor the grey scale average value of red channel, GavgFor the grey scale average value of green channel；
Blue channel compensation section is expressed as：
dB=[Bmax(x,y)-(Bavg-Gavg), Bmax(x, y)], wherein, dBSection, B are compensated for blue channelmax(x, y) is
The grayscale maximum of blue channel, BavgFor the grey scale average value of blue channel.
After completing the establishment to compensating section, the pixel in section is sitting in grey decision-making in original image according to its coordinate
Numbering is sampled, and the value range of the time interval T of sampling is 3-5, and especially, the tests determined sampling interval is preferably T
=4.The grey decision-making of sampled pixel point remains unchanged, and the grey decision-making of rest of pixels point is put down by histogram translation algorithm in section
Move.
Add compensation mechanism after image blue channel gray scale histogram as shown in Figure 4.It can be clearly seen that figure
In substantially in section [200,250], and have the covering of one part of pixel point, which enables to overlapping area
Bigger, can also make it that treatment effect is more preferable.
As described above, the present invention color rendition method can efficiently there will be colour cast image carry out color rendition at
Reason, obtains the image being similar under the irradiation of normal light source；It disclosure satisfy that requirement of the AMOLED display screens for low-power consumption；In algorithm
Largely use be plus, subtraction, compared to using a large amount of multiplication and division methods traditional algorithm, have more low-power consumption, be easier to hardware reality
It is existing, greatly reduce the complexity of algorithm.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (6)
1. a kind of color rendition method, suitable for AMOLED display screens, it is characterised in that the color rendition method at least wraps
Include：
Input original image；
The grey decision-making of all pixels point of original image is multiplied by power constraint coefficient k, to limit image display power, wherein, k
∈(0,1)；
On the basis of the gray scale histogram for taking image Green passage, by it is red with the gray scale histogram of blue channel towards green channel
Gray scale histogram translate and draw close, to increase overlapping area；
Compensation section is established, pixel of the grey decision-making in original image in compensation section is sampled according to its coordinate numbering,
Sampling time interval is T, and the grey decision-making of sampled pixel point remains unchanged, and the grey decision-making for compensating rest of pixels point in section presses Nogata
Figure translation algorithm is translated, to obtain the compensation of high gray area of absence pixel；
Output image.
2. color rendition method according to claim 1, it is characterised in that obtain power constraint coefficient k include at least with
Lower step：
The grey decision-making summation of tri- kinds of Color Channels of R, G and B is obtained respectively；
The grey decision-making summation of tri- kinds of Color Channels of R, G and B is divided by two-by-two, draws three coefficients, wherein, with larger in each coefficient
Person is denominator, using smaller as molecule；
Power constraint coefficient k is used as using the maximum in three coefficients.
3. color rendition method according to claim 1, it is characterised in that it is red with the gray scale histogram of blue channel to
The gray scale histogram translation motion of green channel includes：
The grey scale average value of tri- kinds of Color Channels of R, G and B is obtained respectively；
It is poor respectively to make red, blue channel grey scale average value and the grey scale average value of green channel, by red channel and green
The difference of the grey scale average value of passage is denoted as the first grayscale difference, and the difference of the grey scale average value of blue channel and green channel is remembered
For the second grayscale difference；
Keep the grey decision-making of all pixels point green channel constant；The grey decision-making of red channel and the first grayscale difference are made
Difference, obtains the new gray value of red channel；It is poor that the grey decision-making of blue channel and the second grayscale difference are made, and it is logical to obtain blueness
The new grey decision-making in road.
4. color rendition method according to claim 1, it is characterised in that the step of establishing compensation section includes：
On the basis of the grey scale average value of green channel, by red and blue channel grey scale average value respectively with green channel
It is poor that grey scale average value is made, and the difference of red channel and the grey scale average value of green channel is denoted as the 3rd grayscale difference, blueness is logical
The difference of the grey scale average value of road and green channel is denoted as the 4th grayscale difference；
End point values of the grayscale maximum of red channel as red channel compensation section are taken, take the grayscale maximum of blue channel
End point values as blue channel compensation section；
It is poor that the grayscale maximum of red channel and the 3rd grayscale difference are made, and obtains the initial of red channel compensation section
Value；It is poor that the grayscale maximum of blue channel and the 4th grayscale difference are made, and obtains the initial value in blue channel compensation section；
Then red channel compensation section is expressed as：
dR=[Rmax(x,y)-(Ravg-Gavg), Rmax(x, y)], wherein, dRSection, R are compensated for red channelmax(x, y) is red
The grayscale maximum of passage, RavgFor the grey scale average value of red channel, GavgFor the grey scale average value of green channel；
Blue channel compensation section is expressed as：
dB=[Bmax(x,y)-(Bavg-Gavg), Bmax(x, y)], wherein, dBSection, B are compensated for blue channelmax(x, y) is blueness
The grayscale maximum of passage, BavgFor the grey scale average value of blue channel.
5. color rendition method according to claim 1, it is characterised in that to grey decision-making in original image in compensation section
The value range of time interval T of pixel point sampling be 3-5.
6. color rendition method according to claim 1, it is characterised in that the color rendition method is based on programmable patrol
The association system for collecting device FPGA and AMOLED display screens is realized.
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| CN109102471A (en) * | 2018-07-20 | 2018-12-28 | 遵义师范学院 | A kind of low power image display driving method based on histogram modification |
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| CN113643194A (en) * | 2021-06-25 | 2021-11-12 | 陕西西宇无损检测有限公司 | Pseudo-color display method for high-gray-scale welding seam negative image |
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