CN105141966B - The context modeling method of conversion coefficient in video compress - Google Patents
The context modeling method of conversion coefficient in video compress Download PDFInfo
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Abstract
The context modeling method of conversion coefficient in video compress, the present invention relates to the context modeling technology of conversion coefficient.The present invention be in order to solve the problems, such as context modeling technology employed in HEVC cannot predictive transformation coefficient exactly statistical property.The present invention is in the context modeling procedure that current transform coefficient is bin0, bin1 or bin2, non-zero transform coefficient information in the positional information of current transform coefficient and the local template of current transform coefficient is used, also the code set of the transformation coefficient block of luminance component is divided using position of the conversion coefficient in code set at the same time, the transformation coefficient block of chromatic component is divided using position of the conversion coefficient in transformation coefficient block, finally realizes context modeling.The statistical property of conversion coefficient is more accurately predicted in the present invention, improves the compression efficiency of conversion coefficient.The present invention is applied to field of video encoding.
Description
Technical field
The present invention relates to the context modeling technology of conversion coefficient in video compression.
Background technology
In order to improve the compression efficiency of entropy coding in video compression system, context modeling technology is widely used for predicting
The statistical property of information source.Specifically, the context modeling procedure of source symbol includes：To the statistics of source symbol to be encoded
Characteristic is analyzed, unique using it, and multiple context states are designed for entropy coding；In an encoding process, entropy coder profit
With the value of encoded source symbol, i.e. contextual information, one of state is selected, and in this case to current to be encoded
Source symbol encoded.Wherein, a context state correspond to statistical property (i.e. bar of the information source in the case of a certain kind
Part probability distribution).That is, by context modeling technology, before current information source symbol is encoded, we accord with the information source
Number statistical property have one it is accurately expected, so as to improve code efficiency when entropy coding.
In current newest video compression standard HEVC, the size of transformation coefficient block can using value as 4x4,8x8,
16x16 and 32x32.In order to effectively encode a conversion coefficient all conversion coefficients in the block, transformation coefficient block is divided into
The code set of non-overlapping copies.Each code set correspond to the sub-block of a conversion coefficient 4x4 size in the block.That is, the change of 4x4
Change coefficient block and there was only a code set, the transformation coefficient block of 8x8 there are 4 code sets, and the transformation coefficient block of 16x16 there are 16 codings
Group, the transformation coefficient block of 32x32 have 64 code sets.After splitting in this manner to transformation coefficient block, a change
Conversion coefficient all in code set all in coefficient block and a code set is changed to carry out according to a given scanning sequency
Coding.It is exactly specifically to encode a binary character CSBF first and (correspond to the syntactic element coded_sub_ in HEVC
Block_flag) it is used to refer to whether present encoding group includes non-zero transform coefficient, if the CSBF of present encoding group is 1, i.e.,
Present encoding group includes non-zero transform coefficient, then encodes all conversion coefficients in present encoding group, otherwise handle next volume
Code character.
The coding of each conversion coefficient in each code set is realized by Multiple-Scan.It is exactly specifically,
In first time is scanned, for each conversion coefficient in present encoding group, one is used to indicate whether current transform coefficient is big
Binary character (we represent that it correspond to syntactic element significant_flag in HEVC with bin0) in 0 is compiled
Code is into code stream；In second scans, 0 conversion coefficient, a use are more than for each absolute value in present encoding group
In the absolute value of instruction current transform coefficient, whether more than 1 binary character, (we represent that it correspond to HEVC with bin1
Middle syntactic element coeff_abs_greater1_flag) it is coded into code stream；In third time scans, for present encoding
Each absolute value in group is more than 1 conversion coefficient, and whether an absolute value for being used to indicate current transform coefficient is more than the two of 2
Hex notation (we represent that it correspond to the syntactic element coeff_abs_greater2_flag in HEVC with bin2) quilt
Encode into code stream；In last twice sweep, being separately encoded the symbol of conversion coefficient and residue in present encoding group does not have
The value (correspond to syntactic element coeff_abs_level_remaining in HEVC) of coding.
In HEVC, the context of bin0 include current conversion coefficient to be encoded conversion coefficient position in the block (x,
Y), the scan mode scanIdx of current transform coefficient block and on the downside of the present encoding group and the CSBF of the code set on right side
(we use CSBF to valueLAnd CSBFRTo represent the value of the CSBF of downside code set and right side code set respectively).According to current
Conversion coefficient to be encoded, can be in the hope of the code set comprising current transform coefficient in conversion coefficient position (x, y) in the block
Position (xCG,yCG) and position (x of the current transform coefficient in present encoding groupInCG,yInCG).Therefore, for each transformation series
Number, the context modeling procedure of its bin0 are described as follows：
If currently to be encoded is luminance component：
If x+y is equal to 0,
Ctxbin0=0
If Size is equal to 4x4,
Ctxbin0=ctxIndMap [4*xInCG+yInCG]
If Size is equal to 8x8 and scanIdx is equal to SCAN_DIAG,
If Size is equal to 8x8 and scanIdx is not equal to SCAN_DIAG,
If Size is more than 8x8,
If currently to be encoded is chromatic component：
If x+y is equal to 0,
Ctxbin0=0
If Size is equal to 4x4,
Ctxbin0=ctxIndMap [4*xInCG+yInCG]
If Size is equal to 8x8,
Ctxbin0=9+ctxInc [4*xInCG+yInCG]
If Size is more than 8x8,
Ctxbin0=12+ctxInc [4*xInCG+yInCG]
Wherein according to CSBFLAnd CSBFRValue CtxInc can take ctxInc0, ctxInc1, ctxInc2And ctxInc3。
In HEVC, the context of bin1 include current conversion coefficient to be encoded conversion coefficient position in the block (x,
Y), whether comprising conversion coefficient of the absolute value more than 1, (we represent the context, i.e. c1=1 with c1 in previous code set
Represent that previous code set includes the conversion coefficient that absolute value is more than 1, it is big that c1=0 represents that previous code set does not include absolute value
In 1 conversion coefficient), and absolute value encoded in present encoding group is equal to 1 and absolute value is more than 1 conversion coefficient
(we represent that absolute value encoded in present encoding group is equal to 1 and absolute to number respectively with NumEqu1 and NumGre1
The number of conversion coefficient of the value more than 1)., can according to current conversion coefficient to be encoded in conversion coefficient position (x, y) in the block
In the hope of the position (x of the code set comprising current transform coefficientCG,yCG), therefore for each transformation series of present encoding group
Number, the context modeling procedure of its bin1 are described as follows：
If present encoding is luminance component：
If present encoding is chromatic component：
In HEVC, the context of bin2 include current conversion coefficient to be encoded conversion coefficient position in the block (x,
Y) and in previous code set whether it is more than 1 conversion coefficient comprising absolute value.Existed according to current conversion coefficient to be encoded
Conversion coefficient position (x, y) in the block, can be in the hope of the position (x of the code set comprising current transform coefficientCG,yCG), therefore it is right
In each conversion coefficient of present encoding group, the context modeling procedure of its bin2 can be described as follows：
If present encoding is luminance component：
If present encoding is chromatic component：
In HEVC, the context of bin1 includes whether previous code set has absolute value to be more than 1 conversion coefficient c1 and work as
The number NumEqu1 of conversion coefficient of the encoded absolute value equal to 1 and absolute value are more than 1 transformation series in preceding code set
Several number NumGre1.Using this context modeling method, with the progress of coding, there is provided the transformation series of contextual information
The distance of number and current transform coefficient can become larger, therefore the correlation between them can correspondingly diminish, and reduce the standard of context
True property.In addition, when encoding bin1, transformation coefficient block is divided into two regions, i.e., the coding in the upper left corner in transformation coefficient block
Group is a region, remaining code set is another region.For bin1, the region division side of this transformation coefficient block
Method cannot react the value distribution of bin1 exactly.
In HEVC, the context of bin2 includes the conversion coefficient for whether being more than 1 in previous code set comprising absolute value.
It is similar with the situation of bin1 in HEVC, with the progress of coding, there is provided the conversion coefficient and Current Transform of these contextual informations
The distance of coefficient can become larger, therefore the correlation between them can correspondingly diminish, and reduce the accuracy of context.
The content of the invention
The present invention is cannot predictive transformation coefficient exactly in order to solve context modeling technology employed in HEVC
Statistical property, and propose video compress in conversion coefficient context modeling method.
The context modeling method of conversion coefficient is realized according to the following steps in video compress：
Step 1：To the context modeling of bin0, wherein the bin0 is used for whether indicating current transform coefficient for one
Binary character more than 0；
For the bin0 of the conversion coefficient that is in (x, y) place context include current transform coefficient code set position
(xCG,yCG), position (x of the current transform coefficient in present encoding groupInCG,yInCG) and current transform coefficient localized mode
Plate LT(x,y)The number NumSigs of non-zero transform coefficient in the conversion coefficient covered, (x, y) is current transformation series to be encoded
Number is in the position of current transform coefficient block, LT(x,y)For positioned at the local template of the conversion coefficient at transformation coefficient block (x, y) place, root
Position (the x of the code set comprising current transform coefficient is tried to achieve according to (x, y)CG,yCG) and current transform coefficient in present encoding group
Position (xInCG,yInCG)；
If present encoding is luminance component：
If xCG+yCGEqual to 0, then
Ctxbin0=RegIdx*6+NumSigs (2)
If xCG+yCGMore than 0, then
Ctxbin0=RegIdx*6+NumSigs (4)
Regions of the RegIdx where current transform coefficient, Ctxbin0For the context of the bin0 of conversion coefficient to be encoded
Index；
If present encoding is chromatic component：Then
Ctxbin0=RegIdx*6+NumSigs (6)
Step 2：To the context modeling of bin1, wherein the bin1 is used to indicate the exhausted of current transform coefficient for one
Whether it is more than 1 binary character to value；
Include current conversion coefficient to be encoded current for the context of the bin1 for the conversion coefficient for being in (x, y) place
Encoded absolute value is more than 1 conversion coefficient number in the position (x, y) of transformation coefficient block and present encoding group
The number NumEqu1 of the conversion coefficient of NumGre1 and absolute value equal to 1；
If present encoding is luminance component：
If x+y is less than 3,
Otherwise, if x+y is less than 10,
Otherwise, x+y is greater than or equal to 10, then
The Ctxbin1For the context index of the bin1 of current conversion coefficient to be encoded；
If present encoding is chromatic component：
Step 3：To the context modeling of bin2, wherein the bin2 is used to indicate the exhausted of current transform coefficient for one
Whether it is more than 2 binary character to value；
For the bin2 of the conversion coefficient that is in (x, y) place context include it is encoded exhausted in present encoding group
Number NumGre2 to being worth the conversion coefficient of conversion coefficient number NumGre1 and absolute value more than 2 more than 1；
If present encoding is luminance component,
If NumGre2 is more than 0,
Ctxbin2=0 (11)
Otherwise, if NumGre1 is more than 0,
Ctxbin2=1 (12)
Otherwise,
Ctxbin2=2 (13)
Define Ctxbin2For the context index of the bin2 of current conversion coefficient to be encoded；
If present encoding is chromatic component：
If NumGre2 is more than 0,
Ctxbin2=0 (14)
Otherwise, if NumGre1 is more than 0,
Ctxbin2=1 (15)
Otherwise,
Ctxbin2=2 (16).
In HEVC, the context of bin0 only includes the positional information of current transform coefficient.But by transformation series
Several statistical properties are analyzed, it can be found that the Given information for those conversion coefficients being in around current transform coefficient also can
The value distribution of enough bin0 for predicting current transform coefficient well.Context modeling of the present invention to current transform coefficient bin0
Process employs non-zero transform coefficient in the positional information of current transform coefficient and the local template of current transform coefficient at the same time
Number is as context, and the code set using position of the conversion coefficient in code set to the transformation coefficient block of luminance component
(code set in the upper left corner is divided into 3 regions, remaining code set is divided into two regions) is divided, is existed using conversion coefficient
Position in transformation coefficient block divides the transformation coefficient block of chromatic component；The context of current transform coefficient bin1 is built
Mold process uses the absolute value in the local template of current transform coefficient at the same time more than 1 and absolute value is equal to 1 conversion coefficient
Number and the positional information of current transform coefficient utilize current transform coefficient in transformation coefficient block as context
Position divides transformation coefficient block；The part of current transform coefficient is used to the context modeling procedure of current transform coefficient bin2
In template absolute value be more than 1 and absolute value more than 2 conversion coefficient number be used as context, present invention uses more believe
The context as bin0, bin1, bin2 is ceased, the statistical property of conversion coefficient is more accurately predicted, improves conversion coefficient
Compression efficiency.Test result indicates that the present invention can save 0.82% code check, low latency coding under intraframe coding configuration
Configuration is lower can to save 0.17% code check, can save under random access coding configuration 0.44% code check.The present invention is suitable
For H.264/AVC, AVS, AVS2, the video compression system such as HEVC, VC-1.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention；
The local template schematic diagram that Fig. 2 is conversion coefficient x in the transformation coefficient block that size is 8x8.
Embodiment
Embodiment one：As shown in Figure 1, the context modeling method of conversion coefficient includes following step in video compress
Suddenly：
Step 1：To the context modeling of bin0, wherein the bin0 is used for whether indicating current transform coefficient for one
Binary character more than 0；
It is respectively W and H to define the width of current transform coefficient block and height, and the current conversion coefficient to be encoded of definition is being worked as
Preceding conversion coefficient position in the block is (x, y), and definition is positioned at the local template of the conversion coefficient at transformation coefficient block (x, y) place
LT(x,y), the conversion coefficient which is covered is by positioned at (x+1, y), (x+2, y), (x+1, y+1), (x, y+1) and (x, y
+ 2) the conversion coefficient composition at place, the transformation coefficient block middle position of 8x8 sizes are set to the local template signal of the conversion coefficient of (x, y)
Figure is as shown in Fig. 2, the local template LT of definition(x,y)The number of middle non-zero transform coefficient is NumSigs, can be in the hope of according to (x, y)
Position (the x of code set comprising current transform coefficientCG,yCG) and position (x of the current transform coefficient in present encoding groupInCG,
yInCG), the context of the bin0 of the conversion coefficient for being in (x, y) place includes the position of the code set of current transform coefficient
(xCG,yCG), position (x of the current transform coefficient in present encoding groupInCG,yInCG), and the localized mode of current transform coefficient
The number NumSigs of non-zero transform coefficient in the conversion coefficient that plate is covered；
If present encoding is luminance component：
If xCG+yCGEqual to 0, then
Ctxbin0=RegIdx*6+NumSigs (2)
If xCG+yCGMore than 0, then
Ctxbin0=RegIdx*6+NumSigs (4)
Regions of the RegIdx where current transform coefficient, Ctxbin0For the context of the bin0 of conversion coefficient to be encoded
Index；
If present encoding is chromatic component：Then
Ctxbin0=RegIdx*6+NumSigs (6)
When Ctx is calculatedbin0Afterwards, corresponding contextual information, luminance component are taken out from corresponding set of context
Different set of context is used with chromatic component；
Step 2：To the context modeling of bin1, wherein the bin1 is used to indicate the exhausted of current transform coefficient for one
Whether it is more than 1 binary character to value；
Include current conversion coefficient to be encoded current for the context of the bin1 for the conversion coefficient for being in (x, y) place
Encoded absolute value is more than 1 conversion coefficient number in the position (x, y) of transformation coefficient block and present encoding group
The number NumEqu1 of the conversion coefficient of NumGre1 and absolute value equal to 1；
If present encoding is luminance component：
If x+y is less than 3,
Otherwise, if x+y is less than 10,
Otherwise, x+y is greater than or equal to 10, then
The Ctxbin1For the context index of the bin1 of current conversion coefficient to be encoded；
If present encoding is chromatic component：
When Ctx is calculatedbin1Afterwards, corresponding contextual information, luminance component are taken out from corresponding set of context
Different set of context is used with chromatic component；
Step 3：To the context modeling of bin2, wherein the bin2 is used to indicate the exhausted of current transform coefficient for one
Whether it is more than 2 binary character to value；
For the bin2 of the conversion coefficient that is in (x, y) place context include it is encoded exhausted in present encoding group
Number NumGre2 to being worth the conversion coefficient of conversion coefficient number NumGre1 and absolute value more than 2 more than 1；
If present encoding is luminance component,
If NumGre2 is more than 0,
Ctxbin2=0 (11)
Otherwise, if NumGre1 is more than 0,
Ctxbin2=1 (12)
Otherwise,
Ctxbin2=2 (13)
Define Ctxbin2For the context index of the bin2 of current conversion coefficient to be encoded；
If present encoding is chromatic component：
If NumGre2 is more than 0,
Ctxbin2=0 (14)
Otherwise, if NumGre1 is more than 0,
Ctxbin2=1 (15)
Otherwise,
Ctxbin2=2 (16)
When Ctx is calculatedbin2Afterwards, corresponding contextual information, luminance component are taken out from corresponding set of context
Different set of context is used with chromatic component.The conversion coefficient that is obtained using modeling method carries out video compress.
Embodiment two：The present embodiment is different from the first embodiment in that：Utilize obtained context rope
Draw Ctxbin0, Ctxbin1And Ctxbin2Corresponding context is selected from corresponding set of context, you can obtain the context institute
The probability distribution of correspondent transform coefficient, or the probability distribution of bin0, bin1 and the bin2 of the conversion coefficient, share about 6
Collected works close, and correspond to bin0, bin1 and the bin2 of luminance component and bin0, bin1 and the bin2 of chromatic component respectively.This implementation
Mode is the Ctx to being obtained in embodiment onebin0, Ctxbin1And Ctxbin2Applied.
Embodiment three：The present embodiment is different from the first and the second embodiment in that：Utilize obtained conversion
Coefficient probability distribution, carries out conversion coefficient entropy coding, or utilizes the general of obtained bin0, bin1 and the bin2 of conversion coefficient
Rate is distributed carries out entropy coding to bin0, bin1 and the bin2 of conversion coefficient.Present embodiment is to being obtained in embodiment two
The conversion coefficient probability distribution arrived, or the probability distribution of bin0, bin1 and the bin2 of obtained conversion coefficient are applied.
Embodiment four：The context modeling method of conversion coefficient in a kind of video compress described in present embodiment
In corresponding video information, current conversion coefficient to be encoded is (x, y) in the position of current transform coefficient block；Positioned at conversion
The local template of the conversion coefficient at coefficient block (x, y) place is LT(x,y), the conversion coefficient which is covered is by positioned at (x+
1, y), (x+2, y), (x+1, y+1), the conversion coefficient composition at (x, y+1) and (x, y+2) place, local template LT(x,y)Middle non-zero becomes
The number for changing coefficient is NumSigs；Define the conversion coefficient number that absolute value encoded in present encoding group is more than 1
The number NumEqu1 of the conversion coefficient of NumGre1 and absolute value equal to 1；Define encoded absolute in present encoding group
The number of conversion coefficient of the value more than 2 is NumGre2.For the context of conversion coefficient in the video compress of above-mentioned video information
Modeling method is：
Step 1：The context index Ctx of the bin0 of calculation of transform coefficientsbin0, which can be real as follows
Apply：If present encoding be luminance component transformation coefficient block, according to current conversion coefficient to be encoded in conversion coefficient
Position (x, y) in the block, calculates the local template LT of the conversion coefficient(x,y)The number NumSigs of interior non-zero transform coefficient, at the same time
Calculate the position (x of the code set comprising current transform coefficientCG,yCG) and position of the current transform coefficient in present encoding group
(xInCG,yInCG)；Then (x is utilizedCG,yCG) and (xInCG,yInCG) region where current transform coefficient is calculated, which can be with
Realized using formula (1) and formula (3)；Finally, the context rope of current transform coefficient is calculated using RegIdx and NumSigs
Draw, which can be realized by formula (2) or formula (4).If present encoding be chromatic component transformation coefficient block,
The local template of the conversion coefficient is then calculated in conversion coefficient position (x, y) in the block according to current conversion coefficient to be encoded
LT(x,y)The number NumSigs of interior non-zero transform coefficient, it is then in the block in conversion coefficient using current conversion coefficient to be encoded
Position (x, y) calculates the region RegIdx where current transform coefficient, which can be realized using formula (5)；Finally, it is sharp
The context index of current transform coefficient is calculated with RegIdx and NumSigs, which can be realized by formula (6).
Step 2：The context index Ctx of the bin1 of calculation of transform coefficientsbin1, which can be real as follows
Apply：If present encoding be luminance component transformation coefficient block, using current transform coefficient in the position of current transform coefficient block
Put (x, y) and calculate conversion coefficient number NumGre1 of the absolute value encoded in present encoding group more than 1 and absolute value etc.
In the number NumEqu1 of 1 conversion coefficient；Then using current transform coefficient in the position (x, y) of current transform coefficient block and
NumEqu1 and NumGre1 calculates the context index of current transform coefficient, which can pass through formula (7), formula
(8) realized with formula (9).If present encoding be chromatic component conversion coefficient, using current transform coefficient current
The position (x, y) of transformation coefficient block calculates the conversion coefficient number that absolute value encoded in present encoding group is more than 1
The number NumEqu1 of the conversion coefficient of NumGre1 and absolute value equal to 1；Then calculated using NumEqu1 and NumGre1
The context index of current transform coefficient, the process can be realized by formula (10).
Step 3：The context index Ctx of the bin2 of calculation of transform coefficientsbin2, which can be real as follows
Apply：Calculated using current transform coefficient in the position (x, y) of current transform coefficient block encoded exhausted in present encoding group
Number NumGre2 to being worth the conversion coefficient of conversion coefficient number NumGre1 and absolute value more than 2 more than 1；Then utilize
NumGre1 and NumGre2 calculates the context index of current transform coefficient, and for luminance component, which can utilize formula
(11), formula (12), formula (13) realize that, for chromatic component, which can utilize formula (14), formula (15) and public affairs
Formula (16) is realized.
Step 4：Utilize obtained context index Ctxbin0, Ctxbin1And Ctxbin2Selected from corresponding set of context
Go out corresponding context, you can the bin0 of the probability distribution of conversion coefficient or the conversion coefficient corresponding to the context is obtained,
The probability distribution of bin1 and bin2.Share 6 set of context, correspond to respectively luminance component bin0, bin1 and bin2 and
Bin0, bin1 and the bin2 of chromatic component.
Step 5：Using the probability distribution of obtained conversion coefficient, entropy coding is carried out to conversion coefficient or is utilized to obtain
Conversion coefficient bin0, bin1 and bin2 probability distribution, to bin0, bin1 and bin2 carry out entropy coding.
1~table of table 3 gives the context modeling method used in the context modeling method and HEVC with BD-Rate and exists
The compression performance of different cycle tests is compared under different configuration conditions.
Table 1
| Cycle tests | BD-Bit Rate [%] |
| BasketballDrill@832x480 | -0.3 |
| BQMall@832x480 | -0.9 |
| PartyScene@832x480 | -0.6 |
| FourPeople@1280x720 | -1.2 |
| Johnny@1280x720 | -1.3 |
| KristenAndSara@1280x720 | -0.8 |
| Kimono@1920x1080 | -1.0 |
| ParkScene@1920x1080 | -0.6 |
| Cactus@1920x1080 | -0.7 |
| Average | -0.82 |
Table 1 is given under intraframe coding configuration, and context modeling method proposed by the present invention is built with the context in HEVC
The performance of mould method compares.There it can be seen that compared to the context modeling method in HEVC, context proposed by the present invention is built
The BD-Rate of mould method is -0.82%, that is to say, that under identical video quality, context modeling side proposed by the present invention
Method can save 0.82% code check.
Table 2
| Cycle tests | BD-Bit Rate [%] |
| BasketballDrill@832x480 | -0.1 |
| BQMall@832x480 | -0.6 |
| PartyScene@832x480 | -0.1 |
| FourPeople@1280x720 | -0.3 |
| Johnny@1280x720 | -0.3 |
| KristenAndSara@1280x720 | -0.1 |
| Kimono@1920x1080 | -0.1 |
| ParkScene@1920x1080 | 0.0 |
| Cactus@1920x1080 | 0.1 |
| Average | -0.17 |
Table 2 is given under low latency coding configuration, context modeling method proposed by the present invention and the context in HEVC
The performance of modeling method compares.There it can be seen that compared to the context modeling method in HEVC, context proposed by the present invention
The BD-Rate of modeling method is -0.17%, that is to say, that under identical video quality, context modeling proposed by the present invention
Method can save 0.17% code check.
Table 3
| Cycle tests | BD-Bit Rate [%] |
| BasketballDrill@832x480 | -0.3 |
| BQMall@832x480 | -0.9 |
| PartyScene@832x480 | -0.4 |
| FourPeople@1280x720 | -0.7 |
| Johnny@1280x720 | -0.3 |
| KristenAndSara@1280x720 | -0.2 |
| Kimono@1920x1080 | -0.7 |
| ParkScene@1920x1080 | -0.3 |
| Cactus@1920x1080 | -0.2 |
| Average | -0.44 |
Table 3 is given under random access coding configuration, upper and lower in context modeling method proposed by the present invention and HEVC
The performance of literary modeling method compares.There it can be seen that compared to the context modeling method in HEVC, it is proposed by the present invention upper and lower
The BD-Rate of literary modeling method is -0.44%, that is to say, that under identical video quality, context proposed by the present invention is built
Mould method can save 0.44% code check.
Claims (3)
1. the context modeling method of conversion coefficient in video compress, it is characterised in that the context modeling method include with
Lower step：
Step 1：To the context modeling of bin0, wherein the bin0 is used to indicate whether current transform coefficient is more than 0 for one
Binary character；
For the bin0 of the conversion coefficient that is in (x, y) place context include current transform coefficient code set position (xCG,
yCG), position (x of the current transform coefficient in present encoding groupInCG,yInCG) and current transform coefficient local template
LT(x,y)The number NumSigs of non-zero transform coefficient in the conversion coefficient covered, (x, y) is current conversion coefficient to be encoded
In the position of current transform coefficient block, LT(x,y)For positioned at the local template of the conversion coefficient at transformation coefficient block (x, y) place, according to
(x, y) tries to achieve the position (x of the code set comprising current transform coefficientCG,yCG) and current transform coefficient in present encoding group
Position (xInCG,yInCG)；
If present encoding is luminance component：
If xCG+yCGEqual to 0, then
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<mi>y</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo>&GreaterEqual;</mo>
<mn>2</mn>
<mi>a</mi>
<mi>n</mi>
<mi>d</mi>
<mi> </mi>
<msub>
<mi>x</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>y</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo><</mo>
<mn>5</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mn>2</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>x</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>y</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo>&GreaterEqual;</mo>
<mn>5</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
Ctxbin0=RegIdx*6+NumSigs (2)
If xCG+yCGMore than 0, then
<mrow>
<mi>Re</mi>
<mi>g</mi>
<mi>I</mi>
<mi>d</mi>
<mi>x</mi>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mn>3</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>x</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>y</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo><</mo>
<mn>4</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mn>4</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<msub>
<mi>x</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo>+</mo>
<msub>
<mi>y</mi>
<mrow>
<mi>I</mi>
<mi>n</mi>
<mi>C</mi>
<mi>G</mi>
</mrow>
</msub>
<mo>&GreaterEqual;</mo>
<mn>4</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
Ctxbin0=RegIdx*6+NumSigs (4)
Regions of the RegIdx where current transform coefficient, Ctxbin0For the context index of the bin0 of conversion coefficient to be encoded；
If present encoding is chromatic component：Then
<mrow>
<mi>Re</mi>
<mi>g</mi>
<mi>I</mi>
<mi>d</mi>
<mi>x</mi>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mn>0</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
<mo><</mo>
<mn>4</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mn>1</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mi>y</mi>
<mo>&GreaterEqual;</mo>
<mn>4</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
</mrow>
Ctxbin0=RegIdx*6+NumSigs (6)
Step 2：To the context modeling of bin1, wherein the bin1 is an absolute value for being used to indicate current transform coefficient
Whether 1 binary character is more than；
Include current conversion coefficient to be encoded in Current Transform for the context of the bin1 for the conversion coefficient for being in (x, y) place
Encoded absolute value is more than 1 conversion coefficient number NumGre1 in the position (x, y) of coefficient block and present encoding group
With the number NumEqu1 of conversion coefficient of the absolute value equal to 1；
If present encoding is luminance component：
If x+y is less than 3,
<mrow>
<msub>
<mi>Ctx</mi>
<mrow>
<mi>b</mi>
<mi>i</mi>
<mi>n</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>min</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>-</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>></mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>E</mi>
<mi>q</mi>
<mi>u</mi>
<mn>1</mn>
<mo>,</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>3</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>&le;</mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>7</mn>
<mo>)</mo>
</mrow>
</mrow>
Otherwise, if x+y is less than 10,
<mrow>
<msub>
<mi>Ctx</mi>
<mrow>
<mi>b</mi>
<mi>i</mi>
<mi>n</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>min</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>-</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>7</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>></mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>min</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>H</mi>
<mi>q</mi>
<mi>u</mi>
<mn>1</mn>
<mo>,</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>10</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>&le;</mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>8</mn>
<mo>)</mo>
</mrow>
</mrow>
Otherwise, x+y is greater than or equal to 10, then
<mrow>
<msub>
<mi>Ctx</mi>
<mrow>
<mi>b</mi>
<mi>i</mi>
<mi>n</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>min</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>-</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>14</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>></mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>min</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>H</mi>
<mi>q</mi>
<mi>u</mi>
<mn>1</mn>
<mo>,</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>17</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>&le;</mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>9</mn>
<mo>)</mo>
</mrow>
</mrow>
The Ctxbin1For the context index of the bin1 of current conversion coefficient to be encoded；
If present encoding is chromatic component：
<mrow>
<msub>
<mi>Ctx</mi>
<mrow>
<mi>b</mi>
<mi>i</mi>
<mi>n</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>min</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>-</mo>
<mn>1</mn>
<mo>,</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>></mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>min</mi>
<mrow>
<mo>(</mo>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>H</mi>
<mi>q</mi>
<mi>u</mi>
<mn>1</mn>
<mo>,</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mn>3</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>i</mi>
<mi>f</mi>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>N</mi>
<mi>u</mi>
<mi>m</mi>
<mi>G</mi>
<mi>r</mi>
<mi>e</mi>
<mn>1</mn>
<mo>&le;</mo>
<mn>0</mn>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>10</mn>
<mo>)</mo>
</mrow>
</mrow>
Step 3：To the context modeling of bin2, wherein the bin2 is an absolute value for being used to indicate current transform coefficient
Whether 2 binary character is more than；
Include absolute value encoded in present encoding group for the context of the bin2 for the conversion coefficient for being in (x, y) place
The number NumGre2 of the conversion coefficient of conversion coefficient number NumGre1 and absolute value more than 2 more than 1；
If present encoding is luminance component,
If NumGre2 is more than 0,
Ctxbin2=0 (11)
Otherwise, if NumGre1 is more than 0,
Ctxbin2=1 (12)
Otherwise,
Ctxbin2=2 (13)
Define Ctxbin2For the context index of the bin2 of current conversion coefficient to be encoded；
If present encoding is chromatic component：
If NumGre2 is more than 0,
Ctxbin2=0 (14)
Otherwise, if NumGre1 is more than 0,
Ctxbin2=1 (15)
Otherwise,
Ctxbin2=2 (16).
2. the context modeling method of conversion coefficient in video compress according to claim 1, it is characterised in that utilize
The context index Ctx arrivedbin0, Ctxbin1And Ctxbin2Corresponding context is selected from corresponding set of context, you can
To the probability distribution of conversion coefficient corresponding to the context, or the probability distribution of bin0, bin1 and the bin2 of the conversion coefficient,
Share 6 set of context, correspond to respectively bin0, bin1 and the bin2 of luminance component and the bin0 of chromatic component, bin1 and
bin2。
3. the context modeling method of conversion coefficient in video compress according to claim 2, it is characterised in that when obtaining
During the probability distribution of conversion coefficient corresponding to context, using obtained conversion coefficient probability distribution, entropy is carried out to conversion coefficient
Coding；When obtaining the probability distribution of bin0, bin1 and bin2 of conversion coefficient corresponding to context, obtained transformation series is utilized
The probability distribution of several bin0, bin1 and bin2 carries out entropy coding to bin0, bin1 and the bin2 of conversion coefficient.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1741616A (en) * | 2005-09-23 | 2006-03-01 | 联合信源数字音视频技术（北京）有限公司 | Adaptive entropy coding/decoding method based on context |
| EP2006839A2 (en) * | 2004-07-14 | 2008-12-24 | Agency for Science, Technology and Research | Context-based encoding and decoding of signals |
| CN102186087A (en) * | 2011-06-24 | 2011-09-14 | 哈尔滨工业大学 | Parallel non-zero coefficient context modeling method for binary arithmetic coding |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2006839A2 (en) * | 2004-07-14 | 2008-12-24 | Agency for Science, Technology and Research | Context-based encoding and decoding of signals |
| CN1741616A (en) * | 2005-09-23 | 2006-03-01 | 联合信源数字音视频技术（北京）有限公司 | Adaptive entropy coding/decoding method based on context |
| CN102186087A (en) * | 2011-06-24 | 2011-09-14 | 哈尔滨工业大学 | Parallel non-zero coefficient context modeling method for binary arithmetic coding |
Non-Patent Citations (1)
| Title |
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| 《A parallel context model for level information in CABAC》;Min Gao et;《2011 Visual Communications and Image Processing（VCIP）》;20111231;全文 * |
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