CN106973277B - A kind of rgb format image turns the method and device of YUV420 format - Google Patents
A kind of rgb format image turns the method and device of YUV420 format Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
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- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
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Abstract
The method that rgb format image provided by the invention turns YUV420 format, the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed；By the R of pixel each in each blocks of pixels, G, B color component is mapped to linear space, the average value of each color component is sought in linear space, and each average value is mapped in 0~255 range of corresponding color component, obtain the R of each blocks of pixels, G, B corrects color component, it avoids in the prior art, since the value of each color component is not transformed into linear space, but directly the color component of pixel each in blocks of pixels is added to be averaging or fix, some pixel is selected to do sampled point, cause under VDI environment picture Key detail problem easy to be lost in CAD scene.Then the U component and V component that each blocks of pixels is calculated separately further according to R, G, B amendment color component, finally combine Y-component, obtain the image of YUV420 format, improve the display effect of image.
Description
Technical field
The present invention relates to image format conversion technical fields, more particularly to a kind of rgb format image turns YUV420 lattice
The method and device of formula.
Background technique
With the development of server and network, desktop virtual technology using more and more extensive, still, in extension process
In, virtualization technology also brings some new problems, especially shows in terms of the support to computer aided design software
It is particularly evident.
It is well known that computer aided design software is related to the complex works such as largely calculating, render, it is aobvious to generally require profession
Card is supported, such as the M4000 of NVIDIA (Chinese: tall and handsome to reach).VDI (full name in English: VirtualDesktop
Infrastructure) it is a kind of server- based computing model, is that the Remote Dynamic of the realization desktop system of enterprise-level is visited
Ask the scheme for supporting computer aided design software that video card is generally used to virtualize with data center's trustship technology, VDI, it is main at present
The video card virtualization scheme of stream is divided into hardware virtualization and GPU is shared.
Either using the scheme of the shared still GPU hardware virtualization of GPU, how is the image after will solving GPU rendering
The problem of transmission comes out, the image that Effective Pictures By A Computer comes out, mostly uses greatly sRGB standard, and RGB24 and RGB32 are its mainstreams
Rendering after image storage format, current VMWARE, Huawei, Citrix substantially use the encoding scheme based on H264,
When carrying out H264 coding, first have to rgb format is converted to YUV420 format.
The method that existing rgb format is converted to YUV420 format, under VDI environment, in CAD scene
Picture Key detail is easy to be lost, and display effect is poor.
Summary of the invention
In view of this, the present invention provides the method and devices that a kind of rgb format image turns YUV420 format, by each picture
Each color component of each pixel, is mapped to linear space, then be averaging in plain piecemeal, and by average value inverse mapping to accordingly
Color component 0~255 range in, obtain each amendment color component of each blocks of pixels, avoid area of computer aided
The problem of picture Key detail is lost in design scenario, improves display effect.
Specific technical solution is as follows:
A kind of method that rgb format image turns YUV420 format, comprising:
The blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed；
R, G, B of the coefficient according to as defined in preset standard and each pixel in the rgb format image to be processed
Color component calculates the Y-component of each pixel；
R, G, B color component of each pixel in each described blocks of pixels are mapped to linear space respectively, online
The average value of each color component in each blocks of pixels is sought in property space respectively, and each average value is mapped to
In 0~255 range of corresponding color component, R, G, B amendment color component of each blocks of pixels are respectively obtained；
Color component is corrected according to coefficient as defined in the preset standard and R, G, B of each blocks of pixels, point
The U component and V component for not calculating each blocks of pixels obtain YUV420 format in conjunction with the Y-component of each pixel
Image.
Preferably, when the rgb format image to be processed is RGB32 format, described by rgb format to be processed
Image segmentation is the blocks of pixels of multiple 2*2, before further include:
RGB24 format-pattern is converted by RGB32 format-pattern to be processed.
Preferably, described that R, G, B color component of each pixel in each described blocks of pixels are mapped to line respectively
Property space, comprising:
Respectively by R, G, B color component of each pixel in each described blocks of pixels divided by 255, obtaining range is 0
~1 floating number；
Each floating number is made into the power operation that power is gamma respectively, is obtained each in each described blocks of pixels
The linear value of R, G, B color component of pixel.
Preferably, the average value for seeking each color component in each blocks of pixels respectively in linear space,
Include:
When the linear value of each color component of each pixel is respectively R ', G ' and B ', each pixel point
The average value of each color component is respectively as follows: R in blockavg=(R1 '+R2 '+R3 '+R4 ')/4, Gavg=(G1 '+G2 '+G3 '+
G4 ')/4 and Bavg=(B1 '+B2 '+B3 '+B4 ')/4, the R1 ', R2 ', R3 ' and R4 ' are respectively in each blocks of pixels
The R color component linear value of each pixel, the G1 ', G2 ', G3 ' and G4 ' are respectively each picture in each blocks of pixels
The G color component linear value of element, the B1 ', B2 ', B3 ' and B4 ' are respectively the B face of each pixel in each blocks of pixels
Colouring component linear value.
Preferably, described that each average value is mapped in 0~255 range of corresponding color component, it respectively obtains
R, G, B of each blocks of pixels correct color component, comprising:
Table linear_2_gamma is defined, has t_size+1 index entry in table linear_2_gamma, t_size is positive
Integer, Xt_pos=Xavg/ (1/t_size), Xt_posCalculated result be rounded downwards, make Xt_posIn table linear_2_gamma
An index entry it is corresponding, wherein X be R color component, G color component or B color component, XavgFor the blocks of pixels X
The average value of color component；
Define linear_2_gamma [Xt_pos]=pow (Xt_pos/ t_size, 1/gamma) * 255, respectively by each institute
The average value for stating each color component in blocks of pixels is mapped in 0~255 range of corresponding color component, obtains each institute
State the mapping value of each color component in blocks of pixels；
The mapping value of each color component in each blocks of pixels is modified,Wherein, XreviseFor the amendment face of X
Colouring component.
Preferably, described that each average value is mapped in 0~255 range of corresponding color component, it respectively obtains
R, G, B of each blocks of pixels correct color component, comprising:
Each average value is made into the power operation that power is 1/gamma respectively, respectively obtains each described blocks of pixels
The mapping value of middle R, G, B color component；
The mapping value of R, G, B color component in each described blocks of pixels is taken multiplied by 255, and by calculated result respectively
Whole R, G, B the amendment color component for obtaining each blocks of pixels.
Preferably, the value of above-mentioned gamma is 2.2.
A kind of rgb format image turns the device of YUV420 format, comprising:
Cutting unit, for the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed；
First computing unit, in the coefficient according to as defined in preset standard and the rgb format image to be processed
Each pixel R, G, B color component, calculate the Y-component of each pixel；
Amending unit, for being respectively mapped to R, G, B color component of each pixel in each described blocks of pixels
Linear space seeks the average value of each color component in each blocks of pixels in linear space respectively, and each institute
It states average value to be mapped in 0~255 range of corresponding color component, respectively obtains R, G, B amendment of each blocks of pixels
Color component；
Second computing unit, for the coefficient according to as defined in the preset standard and each blocks of pixels R,
G, B corrects color component, calculates separately the U component and V component of each blocks of pixels, in conjunction with Y points of each pixel
Amount, obtains the image of YUV420 format.
Preferably, when the rgb format image to be processed is RGB32 format, described device further include:
Conversion unit, for converting RGB24 format-pattern for RGB32 format-pattern to be processed.
Preferably, the amending unit includes mapping subelement；
The mapping subelement, for respectively by R, G, B color component of each pixel in each described blocks of pixels
Divided by 255, the floating number that range is 0~1 is obtained；Each floating number is made into the power operation that power is gamma respectively, is obtained every
The linear value of R, G, B color component of each pixel in one blocks of pixels.
Preferably, the amending unit includes computation subunit；
The computation subunit, for when each pixel each color component linear value be respectively R ', G ' and
When B ', the average value of each color component is respectively as follows: R in each blocks of pixelsavg=(R1 '+R2 '+R3 '+R4 ')/4,
Gavg=(G1 '+G2 '+G3 '+G4 ')/4 and Bavg=(B1 '+B2 '+B3 '+B4 ')/4, the R1 ', R2 ', R3 ' and R4 ' are respectively
For the R color component linear value of each pixel in each blocks of pixels, the G1 ', G2 ', G3 ' and G4 ' are respectively each
The G color component linear value of each pixel in the blocks of pixels, the B1 ', B2 ', B3 ' and B4 ' are respectively each picture
The B color component linear value of each pixel in plain piecemeal.
Preferably, the amending unit includes the first inverse mapping subelement,
The first inverse mapping subelement has t_ in table linear_2_gamma for defining table linear_2_gamma
Size+1 index entry, t_size are positive integer, Xt_pos=Xavg/ (1t_size), Xt_posCalculated result be rounded downwards, make
Xt_posIt is corresponding with an index entry in table linear_2_gamma, wherein X is R color component, G color component or B color
Component, XavgFor the average value of the blocks of pixels X color component；Define linear_2_gamma [Xt_pos]=pow (Xt_pos/
T_size, 1gamma) * 255, the average value of each color component in each blocks of pixels is mapped to corresponding face respectively
In 0~255 range of colouring component, the mapping value of each color component in each blocks of pixels is obtained；To each picture
The mapping value of each color component is modified in plain piecemeal,Wherein, XreviseFor the amendment face of X
Colouring component.
Preferably, the amending unit includes the second inverse mapping subelement；
The second inverse mapping subelement, for each average value to be made the power operation that power is 1/gamma respectively, point
The mapping value of R, G, B color component in each described blocks of pixels is not obtained；Respectively by R in each described blocks of pixels,
G, the mapping value of B color component corrects face multiplied by 255, and by R, G, B that calculated result is rounded to obtain each blocks of pixels
Colouring component.
Compared with the existing technology, beneficial effects of the present invention are as follows:
Rgb format image provided by the invention turns the method and device of YUV420 format, by rgb format image to be processed
It is divided into the blocks of pixels of multiple 2*2；In the coefficient according to as defined in preset standard and the rgb format image to be processed
Each pixel R, G, B color component, calculate the Y-component of each pixel；It respectively will be in each described blocks of pixels
R, G, B color component of each pixel are mapped to linear space, seek respectively in linear space every in each blocks of pixels
The average value of a color component, and each average value is mapped in 0~255 range of corresponding color component, respectively
R, G, B to each blocks of pixels correct color component；It avoids in the prior art, due to not by each color component
Value be transformed into linear space, but directly the color component of pixel each in blocks of pixels is added and is averaging or fixed selects
Some pixel does sampled point, causes under VDI environment picture Key detail problem easy to be lost in CAD scene.So
The U component and V component for calculating separately each blocks of pixels further according to R, G, B amendment color component afterwards, finally combine Y-component, obtain
To the image of YUV420 format, the display effect of image is improved.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the method flow diagram that a kind of rgb format image disclosed by the embodiments of the present invention turns YUV420 format；
Fig. 2 is the apparatus structure schematic diagram that a kind of rgb format image disclosed by the embodiments of the present invention turns YUV420 format.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Inventor it has been investigated that, the method that two kinds of rgb format images existing in the prior art turn YUV420 format,
There is a problem of that picture Key detail is easy to be lost in CAD scene under VDI environment.
Wherein, a kind of prior art is the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed, respectively
Each color component of pixel each in each blocks of pixels is summed up into averaging, using average value as each pixel
The value of each color component of piecemeal, this method do not meet the perception characteristics of human vision, and the color of image distortion after conversion is tight
Weight.
Another prior art is the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed, in each picture
Down-sampling is carried out in each pixel in plain piecemeal and selects sampled point, using the value of each color component of sampled point as each
Apparent visual difference is not present in value of a blocks of pixels per each and every one color component, this implementation method in the processing of natural image
Not, be because the image of nature is mostly visually continuous, and when showing CAD image under VDI environment,
This method is not appropriate for, and converted images cross-color is serious.
In view of this, present embodiment discloses a kind of methods that rgb format image turns YUV420 format, referring to Fig. 1, institute
State method the following steps are included:
S101: the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed；
Specifically, rgb format image to be processed can be RGB32 format or RGB24 format.
RGB24 uses R, G, B three primary colors, i.e. Red Green Blue, each color component is indicated with 8, three components
Be added together is 24.RGB32 also adds 8 positions alpha, RGB32 other than 24 three primary colors that RGB24 includes
It can be converted with RGB equivalence.
It should be noted that when the rgb format image to be processed is RGB32 format, before S101 further include:
RGB24 format-pattern is converted by RGB32 format-pattern to be processed.
It is understood that including 4 pixels in the blocks of pixels of each 2*2.
S102: the coefficient according to as defined in preset standard and each pixel in the rgb format image to be processed
R, G, B color component calculates the Y-component of each pixel；
It should be noted that the preset standard can be ITU-R Recommendation BT.601 and ITU-R
The standards such as Recommendation BT.709, preset standard respectively provide Y, U, V component coefficient, each pixel include R,
G, tri- color components of B, according to ITU-R Recommendation BT.601 and ITU-R Recommendation BT.709
Etc. coefficient and tri- color components of R, G, B of each pixel in the rgb format image to be processed as defined in standards,
The Y-component for calculating each pixel, so not doing multiprocessing to Y-component, directly takes since Y-component is not related to down-sampling
Value.
S103: being mapped to linear space for R, G, B color component of each pixel in each described blocks of pixels respectively,
The average value of each color component in each blocks of pixels is sought respectively in linear space, and each average value is reflected
It is mapped in 0~255 range of corresponding color component, respectively obtains R, G, B amendment color component of each blocks of pixels；
Specifically, described be mapped to line for R, G, B color component of each pixel in each described blocks of pixels respectively
Property space, a kind of preferred embodiment are as follows:
Respectively by R, G, B color component of each pixel in each described blocks of pixels divided by 255, obtaining range is 0
~1 floating number；
Each floating number is made into the power operation that power is gamma respectively, is obtained each in each described blocks of pixels
The linear value of R, G, B color component of pixel.
It should be noted that R, G of each pixel, B component respectively correspond some value in 0~255 grade of brightness；
The value of gamma can be adjusted according to actual needs, it is preferred that the value range of gamma is (0,5), by many experiments
Verifying, 2.2 be the best value of gamma, and other values in (0,5) range can also be selected according to actual scene.
It should also be noted that, processing when being 0 for floating number can according to reality in the conversion process of picture format
To be adjusted according to the actual situation, in a kind of possible situation, floating number 0 is added into a smaller numerical value, this
The value range of numerical value is (0,1), 0.01 is generally taken, then floating number 0.01 is made the power operation that power is gamma, after image conversion
Display effect may more preferably.User can decide whether floating number 0 is smaller plus one according to actual test
Numerical value handled again.
Specifically, each pixel includes R color component, G color component and B color component, it is described in linear space
The average value for seeking each color component in each blocks of pixels respectively can be there are many method, wherein a kind of method are as follows:
When the linear value of each color component of each pixel is respectively R ', G ' and B ', each pixel point
The average value of each color component is respectively as follows: R in blockavg=(R1 '+R2 '+R3 '+R4 ')/4, Gavg=(G1 '+G2 '+G3 '+
G4 ')/4 and Bavg=(B1 '+B2 '+B3 '+B4 ')/4, the R1 ', R2 ', R3 ' and R4 ' are respectively in each blocks of pixels
The R color component linear value of each pixel, the G1 ', G2 ', G3 ' and G4 ' are respectively each picture in each blocks of pixels
The G color component linear value of element, the B1 ', B2 ', B3 ' and B4 ' are respectively the B face of each pixel in each blocks of pixels
Colouring component linear value.
Another method are as follows:
When the linear value of each color component of each pixel is respectively R ', G ' and B ', each pixel point
The average value of each color component is respectively as follows: in block
WithThe R1 ', R2 ', R3 '
It is respectively the R color component linear value of each pixel in each blocks of pixels, the G1 ', G2 ', G3 ' and G4 ' points with R4 '
Not Wei in each blocks of pixels each pixel G color component linear value, the B1 ', B2 ', B3 ' and B4 ' are respectively every
The B color component linear value of each pixel in a blocks of pixels.
Specifically, described be mapped to each average value in 0~255 range of corresponding color component, respectively obtain
R, G, B of each blocks of pixels correct color component, can be there are many method, and preferably a kind of the specific of method executes step
It is rapid as follows:
Table linear_2_gamma is defined, has t_size+1 index entry in table linear_2_gamma, t_size is positive
Integer, Xt_pos=Xavg/ (1/t_size), Xt_posCalculated result be rounded downwards, make Xt_posIn table linear_2_gamma
An index entry it is corresponding, wherein X be R color component, G color component or B color component, XavgFor the blocks of pixels X
The average value of color component；
Define linear_2_gamma [Xt_pos]=pow (Xt_pos/ t_size, 1/gamma) * 255, respectively by each institute
The average value for stating each color component in blocks of pixels is mapped in 0~255 range of corresponding color component, obtains each institute
State the mapping value of each color component in blocks of pixels；
The mapping value of each color component in each blocks of pixels is modified,Wherein, XreviseFor the amendment face of X
Colouring component.
It is illustrated so that t_size is 5 as an example, there is 6 index entries in table linear_2_gamma, R, G, B color component
Average value corresponds in table linear_2_gamma in [0,1], and the average value of R, G, B color component respectively corresponds 0,0.2,
0.4,0.6,0.8,1.0, then respective value of the average value of R, G, B color component in table linear_2_gamma is made into power respectively
The mapping of R, G, B color component in each described blocks of pixels is respectively obtained multiplied by 255 for the power operation of 1/gamma
Value, it may be assumed that
Linear_2_gamma [0]=pow (0,1/gamma) * 255；
Linear_2_gamma [1]=pow (0.2,1/gamma) * 255；
Linear_2_gamma [2]=pow (0.4,1/gamma) * 255；
Linear_2_gamma [3]=pow (0.6,1/gamma) * 255；
Linear_2_gamma [4]=pow (0.8,1/gamma) * 255；
Linear_2_gamma [5]=pow (1.0,1/gamma) * 255.
It should be noted that R, G of each pixel, B component respectively correspond some value in 0~255 grade of brightness；
The value of gamma can be adjusted according to actual needs, it is preferred that the value range of gamma is (0,5), by many experiments
Verifying, 2.2 be the best value of gamma, and other values in (0,5) range can also be selected according to actual scene.
Finally, being repaired using mapping value of the linear difference method R, G, B color component in each described blocks of pixels
Just.This modification method accuracy rate is high, keeps the display effect of image more preferable.
Another " is mapped to each average value in 0~255 range of corresponding color component, respectively obtains each
A kind of optional specific implementation procedure of R, G, B amendment color component of a blocks of pixels " is as follows:
Each average value is made into the power operation that power is 1/gamma respectively, respectively obtains each described blocks of pixels
The mapping value of middle R, G, B color component；
The mapping value of R, G, B color component in each described blocks of pixels is taken multiplied by 255, and by calculated result respectively
Whole R, G, B the amendment color component for obtaining each blocks of pixels.
It should be noted that R, G of each pixel, B component respectively correspond some value in 0~255 grade of brightness；
The value of gamma can be adjusted according to actual needs, it is preferred that the value range of gamma is (0,5), by many experiments
Verifying, 2.2 be the best value of gamma, and other values in (0,5) range can also be selected according to actual scene.
It should also be noted that, the rounding mode to round up can be used, rounding up or being rounded downwards is ok.Example
Such as: calculated result 1.6, calculated result can be rounded up is 2, or being rounded downwards is 1.
S104: according to coefficient as defined in the preset standard and R, G, B of each blocks of pixels amendment color point
Amount, the U component and V component for calculating separately each blocks of pixels obtain YUV420 in conjunction with the Y-component of each pixel
The image of format.
It should be noted that the preset standard in step S104 may be ITU-R Recommendation BT.601
With the standards such as ITU-R Recommendation BT.709.
The method that rgb format image provided in this embodiment turns YUV420 format, by rgb format image segmentation to be processed
For the blocks of pixels of multiple 2*2；It is each in the coefficient according to as defined in preset standard and the rgb format image to be processed
R, G, B color component of a pixel calculate the Y-component of each pixel；It respectively will be each in each described blocks of pixels
R, G, B color component of pixel are mapped to linear space, seek each face in each blocks of pixels respectively in linear space
The average value of colouring component, and each average value is mapped in 0~255 range of corresponding color component, it respectively obtains each
R, G, B of a blocks of pixels correct color component；It avoids in the prior art, due to not by the value of each color component
It is transformed into linear space, but directly the color component of pixel each in blocks of pixels is added to be averaging or fix and selects some
Pixel does sampled point, causes under VDI environment picture Key detail problem easy to be lost in CAD scene.Then again
The U component and V component that color component calculates separately each blocks of pixels are corrected according to R, G, B, Y-component is finally combined, obtains
The image of YUV420 format improves the display effect of image.
Referring to Fig. 2, disclosed rgb format image turns the method for YUV420 format, the present embodiment based on the above embodiment
A kind of corresponding device for disclosing rgb format image and turning YUV420 format, comprising:
It should be noted that when the rgb format image to be processed is RGB32 format, described device further include:
Conversion unit, for converting RGB24 format-pattern for RGB32 format-pattern to be processed.
If rgb format image to be processed is RGB24 format, directly carry out with the operation of lower unit:
Cutting unit 101, for the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed；
First computing unit 102 is used for the coefficient according to as defined in preset standard and the rgb format figure to be processed
R, G, B color component of each pixel as in calculate the Y-component of each pixel；
It should be noted that the preset standard can be ITU-R Recommendation BT.601 and ITU-R
The standards such as Recommendation BT.709, preset standard respectively provide Y, U, V component coefficient, each pixel include R,
G, tri- color components of B, according to ITU-R Recommendation BT.601 and ITU-R Recommendation BT.709
Etc. coefficient and tri- color components of R, G, B of each pixel in the rgb format image to be processed as defined in standards,
The Y-component for calculating each pixel, so not doing multiprocessing to Y-component, directly takes since Y-component is not related to down-sampling
Value.
Amending unit 103, for respectively mapping R, G, B color component of each pixel in each described blocks of pixels
To linear space, the average value of each color component in each blocks of pixels is sought respectively in linear space, and each
The average value is mapped in 0~255 range of corresponding color component, and R, G, the B for respectively obtaining each blocks of pixels are repaired
Positive color component；
Second computing unit 104, for the coefficient according to as defined in the preset standard and each blocks of pixels
R, G, B correct color component, the U component and V component of each blocks of pixels are calculated separately, in conjunction with the Y of each pixel
Component obtains the image of YUV420 format.
Specifically, the amending unit 103 includes mapping subelement, computation subunit and inverse mapping subelement, wherein meter
There are two types of implementations respectively for operator unit and inverse mapping subelement.
The mapping subelement, for respectively by R, G, B color component of each pixel in each described blocks of pixels
Divided by 255, the floating number that range is 0~1 is obtained；Each floating number is made into the power operation that power is gamma respectively, is obtained every
The linear value of R, G, B color component of each pixel in one blocks of pixels.
The computation subunit, for when each pixel each color component linear value be respectively R ', G ' and
When B ', the average value of each color component is respectively as follows: R in each blocks of pixelsavg=(R1 '+R2 '+R3 '+R4 ')/4,
Gavg=(G1 '+G2 '+G3 '+G4 ')/4 and Bavg=(B1 '+B2 '+B3 '+B4 ')/4, the R1 ', R2 ', R3 ' and R4 ' are respectively
The R color component linear value of each pixel in each blocks of pixels, the G1 ', G2 ', G3 ' and G4 ' are respectively each institute
The G color component linear value of each pixel in blocks of pixels is stated, the B1 ', B2 ', B3 ' and B4 ' are respectively each pixel
The B color component linear value of each pixel in piecemeal.
Another implementation of computation subunit are as follows:
When the linear value of each color component of each pixel is respectively R ', G ' and B ', each pixel point
The average value of each color component is respectively as follows: in block
WithThe R1 ', R2 ', R3 '
It is respectively the R color component linear value of each pixel in each blocks of pixels, the G1 ', G2 ', G3 ' and G4 ' points with R4 '
Not Wei in each blocks of pixels each pixel G color component linear value, the B1 ', B2 ', B3 ' and B4 ' are respectively every
The B color component linear value of each pixel in a blocks of pixels.
Two kinds of implementations of inverse mapping subelement use respectively the first inverse mapping subelement and the second inverse mapping subelement into
Row explanation.
First inverse mapping subelement has t_size+ in table linear_2_gamma for defining table linear_2_gamma
1 index entry, t_size are positive integer, Xt_pos=Xavg/ (1/t_size), Xt_posCalculated result be rounded downwards, make Xt_pos
It is corresponding with an index entry in table linear_2_gamma, wherein X is R color component, G color component or B color point
Amount, XavgFor the average value of the blocks of pixels X color component；Define linear_2_gamma [Xt_pos]=pow (Xt_pos/t_
Size, 1/gamma) * 255, the average value of each color component in each blocks of pixels is mapped to corresponding face respectively
In 0~255 range of colouring component, the mapping value of each color component in each blocks of pixels is obtained；To each picture
The mapping value of each color component is modified in plain piecemeal,Wherein, XreviseFor the amendment face of X
Colouring component.
Second inverse mapping subelement, for each average value to be made the power operation that power is 1/gamma respectively, respectively
The mapping value of R, G, B color component into blocks of pixels described in each；Respectively by R, G, B face in each described blocks of pixels
Calculated result is rounded to obtain R, G, B amendment color point of each blocks of pixels by the mapping value of colouring component multiplied by 255
Amount.
It should be noted that R, G of each pixel, B component respectively correspond some value in 0~255 grade of brightness；
The value of gamma can be adjusted according to actual needs, it is preferred that the value range of gamma is (0,5), by many experiments
Verifying, 2.2 be the best value of gamma, and other values in (0,5) range can also be selected according to actual scene.
Rgb format image disclosed in the present embodiment turns the device of YUV420 format, and amending unit 103 is by each blocks of pixels
In each pixel each color component, be mapped to linear space, then be averaging, and by average value inverse mapping to corresponding color
In 0~255 range of component, each amendment color component of each blocks of pixels is obtained, CAD field is avoided
The problem of picture Key detail is lost in scape, improves display effect.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (13)
1. a kind of method that rgb format image turns YUV420 format characterized by comprising
The blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed；
R, G, B color of the coefficient according to as defined in preset standard and each pixel in the rgb format image to be processed
Component calculates the Y-component of each pixel；
R, G, B color component of each pixel in each described blocks of pixels are mapped to linear space respectively, linear empty
Between seek the average value of each color component in each blocks of pixels respectively, and each average value is mapped to accordingly
In 0~255 range of color component, R, G, B amendment color component of each blocks of pixels are respectively obtained；
Color component is corrected according to coefficient as defined in the preset standard and R, G, B of each blocks of pixels, is counted respectively
The U component and V component for calculating each blocks of pixels obtain the figure of YUV420 format in conjunction with the Y-component of each pixel
Picture.
2. the method according to claim 1, wherein when the rgb format image to be processed is RGB32 format
When, in the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed, before further include:
RGB24 format-pattern is converted by RGB32 format-pattern to be processed.
3. the method according to claim 1, wherein described respectively by each picture in each described blocks of pixels
R, G, B color component of element are mapped to linear space, comprising:
Respectively by R, G, B color component of each pixel in each described blocks of pixels divided by 255, obtaining range is 0~1
Floating number；
Each floating number is made into the power operation that power is gamma respectively, obtains each pixel in each described blocks of pixels
R, G, B color component linear value.
4. the method according to claim 1, wherein described seek each pixel point in linear space respectively
The average value of each color component in block, comprising:
When the linear value of each color component of each pixel is respectively R ', G ' and B ', in each blocks of pixels
The average value of each color component is respectively as follows: Ravg=(R1 '+R2 '+R3 '+R4 ')/4, Gavg=(G1 '+G2 '+G3 '+G4 ')/4
And Bavg=(B1 '+B2 '+B3 '+B4 ')/4, the R1 ', R2 ', R3 ' and R4 ' are respectively each picture in each blocks of pixels
The R color component linear value of element, the G1 ', G2 ', G3 ' and G4 ' are respectively the G face of each pixel in each blocks of pixels
Colouring component linear value, the B1 ', B2 ', B3 ' and B4 ' are respectively the B color component of each pixel in each blocks of pixels
Linear value.
5. the method according to claim 1, wherein described be mapped to corresponding color point each average value
In 0~255 range of amount, R, G, B amendment color component of each blocks of pixels are respectively obtained, comprising:
Table linear_2_gamma is defined, has t_size+1 index entry in table linear_2_gamma, t_size is positive integer,
Xt_pos=Xavg/ (1/t_size), Xt_posCalculated result be rounded downwards, make Xt_posWith one in table linear_2_gamma
Index entry is corresponding, wherein X is R color component, G color component or B color component, XavgFor the blocks of pixels X color point
The average value of amount；
Define linear_2_gamma [Xt_pos]=pow (Xt_pos/ t_size, 1/gamma) * 255, respectively by each pixel
The average value of each color component is mapped in 0~255 range of corresponding color component in piecemeal, obtains each pixel
The mapping value of each color component in piecemeal；
The mapping value of each color component in each blocks of pixels is modified,Wherein, XreviseFor the amendment face of X
Colouring component.
6. the method according to claim 1, wherein described be mapped to corresponding color point each average value
In 0~255 range of amount, R, G, B amendment color component of each blocks of pixels are respectively obtained, comprising:
By each average value make respectively power be 1/gamma power operation, respectively obtain R in each described blocks of pixels,
G, the mapping value of B color component；
The mapping value of R, G, B color component in each described blocks of pixels is rounded multiplied by 255, and by calculated result respectively
R, G, B to each blocks of pixels correct color component.
7. according to the described in any item methods of claim 3,5,6, which is characterized in that the value range of the gamma be (0,
5)。
8. the device that a kind of rgb format image turns YUV420 format characterized by comprising
Cutting unit, for the blocks of pixels for being multiple 2*2 by rgb format image segmentation to be processed；
First computing unit, for each in the coefficient according to as defined in preset standard and the rgb format image to be processed
R, G, B color component of a pixel calculate the Y-component of each pixel；
Amending unit, for being respectively mapped to R, G, B color component of each pixel in each described blocks of pixels linearly
The average value of each color component in each blocks of pixels is sought in linear space in space respectively, and each described flat
Mean value is mapped in 0~255 range of corresponding color component, respectively obtains R, G, B amendment color of each blocks of pixels
Component；
Second computing unit, R, G, B for the coefficient according to as defined in the preset standard and each blocks of pixels are repaired
Positive color component, the U component and V component for calculating separately each blocks of pixels are obtained in conjunction with the Y-component of each pixel
To the image of YUV420 format.
9. device according to claim 8, which is characterized in that when the rgb format image to be processed is RGB32 format
When, described device further include:
Conversion unit, for converting RGB24 format-pattern for RGB32 format-pattern to be processed.
10. device according to claim 8, which is characterized in that the amending unit includes mapping subelement；
The mapping subelement, for respectively by R, G, B color component of each pixel in each described blocks of pixels divided by
255, obtain the floating number that range is 0~1；Each floating number is made into the power operation that power is gamma respectively, obtains each
The linear value of R, G, B color component of each pixel in the blocks of pixels.
11. device according to claim 8, which is characterized in that the amending unit includes computation subunit；
The computation subunit, for when the linear value of each color component of each pixel is respectively R ', G ' and B ',
The average value of each color component is respectively as follows: R in each blocks of pixelsavg=(R1 '+R2 '+R3 '+R4 ')/4, Gavg=
(G1 '+G2 '+G3 '+G4 ')/4 and Bavg=(B1 '+B2 '+B3 '+B4 ')/4, the R1 ', R2 ', R3 ' and R4 ' are respectively each
The R color component linear value of each pixel in the blocks of pixels, the G1 ', G2 ', G3 ' and G4 ' are respectively each picture
The G color component linear value of each pixel in plain piecemeal, the B1 ', B2 ', B3 ' and B4 ' are respectively each blocks of pixels
In each pixel B color component linear value.
12. device according to claim 8, which is characterized in that the amending unit includes the first inverse mapping subelement,
The first inverse mapping subelement has t_size+ in table linear_2_gamma for defining table linear_2_gamma
1 index entry, t_size are positive integer, Xt_pos=Xavg/ (1/t_size), Xt_posCalculated result be rounded downwards, make Xt_pos
It is corresponding with an index entry in table linear_2_gamma, wherein X is R color component, G color component or B color point
Amount, XavgFor the average value of the blocks of pixels X color component；Define linear_2_gamma [Xt_pos]=pow (Xt_pos/t_
Size, 1/gamma) * 255, the average value of each color component in each blocks of pixels is mapped to corresponding face respectively
In 0~255 range of colouring component, the mapping value of each color component in each blocks of pixels is obtained；
The mapping value of each color component in each blocks of pixels is modified,Wherein, XreviseFor the amendment face of X
Colouring component.
13. device according to claim 8, which is characterized in that the amending unit includes the second inverse mapping subelement；
The second inverse mapping subelement, for each average value to be made the power operation that power is 1/gamma respectively, respectively
The mapping value of R, G, B color component into blocks of pixels described in each；Respectively by R, G, B face in each described blocks of pixels
Calculated result is rounded to obtain R, G, B amendment color point of each blocks of pixels by the mapping value of colouring component multiplied by 255
Amount.
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