CN106851274B - Differential quantization determination method for parameter determines system and video encoder - Google Patents
Differential quantization determination method for parameter determines system and video encoder Download PDFInfo
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- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
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- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
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Abstract
This application discloses a kind of differential quantization determination method for parameter, determine system and video encoder, wherein, differential quantization determination method for parameter is divided at least two regions to be encoded according to the size of discrete cosine transform coefficient block first, then the prediction quantization parameter for being located at the region to be encoded of the preset direction initial position at least two regions to be encoded is determined according to pre-arranged code rule, and its differential quantization parameter is determined according to the quantization parameter in the region to be encoded and prediction quantization parameter, the differential quantization parameter in remaining region to be encoded is finally successively calculated according to the quantization parameter in the region to be encoded for being located at the preset direction initial position at least two regions to be encoded.The method that a differential quantization parameter is determined to a discrete cosine transform coefficient block in compared to the prior art, differential quantization determination method for parameter is that discrete cosine transform coefficient block determines at least two differential quantization parameters, to realize the purpose for improving video coding efficiency.
Description
Technical field
This application involves technical field of image processing, more specifically to a kind of differential quantization determination method for parameter,
Determine system and video encoder.
Background technique
Quantization is reduction image code length under the premise of not reducing visual effect, is reduced unnecessary in recovery of vision
The operation of information is the core procedure in video coding process, in the discrete cosine transform (Discrete of mainstream now
Cosine Transform, DCT) hybrid predicting base video encoder in, image is divided into multiple images block and is compiled respectively
Code, during quantifying to described image block, the determination of the differential quantization parameter of each image block is to determine that video is compiled
The key of code efficiency.
In coding standard H.264 and earlier, image is divided into multiple images block in coding, carries out to image block pre-
It surveys, obtains prediction block, and prediction block and current image block are subtracted each other, obtain residual block, dct transform then is executed to residual block,
Obtain with an equal amount of discrete cosine transform coefficient block of original image block, finally to this discrete cosine transform coefficient block amount of progress
Change.The determination of differential quantization parameter of each discrete cosine transform coefficient block in quantization is joined using the quantization of current image block
The quantization parameter that a upper image block uses in several and coded sequence subtracts each other determining.H.265 coding standard is obtained to H.264 middle
The algorithm of the differential quantization parameter of each discrete cosine transform coefficient block is optimized, and with reference to Fig. 1, in Fig. 1, QPC is indicated
Current discrete cosine transform coefficient block to be encoded, QPT and QPL, which are respectively indicated, is located at current discrete cosine transform coefficient to be encoded
Block top and upper left discrete cosine transform coefficient block, in the difference for determining current discrete cosine transform coefficient block to be encoded
When quantization parameter, the average value of the quantization parameter of QPT and QPL is taken, and using the average value as described current to be encoded discrete remaining
The prediction quantization parameter of string transformation coefficient block, then by the quantization parameter of the current discrete cosine transform coefficient block to be encoded with
Its predict quantization parameter make it is poor, obtain it is described currently discrete cosine transform coefficient block to be encoded differential quantization parameter, no matter
And H.265 H.264 in coding standard, the quantization parameter of each discrete cosine transform coefficient block is determined by video encoder.
H.265 the value range of each discrete cosine transform coefficient block size is 4 pixels × -32 pixel of 4 pixel × 32 pixels in, including
Endpoint value, in H.264, discrete cosine transform coefficient block be only fixed size macro block (its size be 16 pixels ×
16 pixels) have more flexibility.H.265 coding standard is substantially reduced than the code rate of H.264 coding standard, makes video for network
The requirement of transmission speed substantially reduces.
But the method for video coding of mainstream all has that efficiency is lower now, how to improve video coding efficiency is
One of the direction that researcher makes great efforts.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of differential quantization determination method for parameter, determine system and
Video encoder, to realize the purpose for improving video coding efficiency.
To realize the above-mentioned technical purpose, the embodiment of the invention provides following technical solutions:
A kind of differential quantization determination method for parameter, the amount applied to discrete cosine transform coefficient block in image encoding process
Change process, comprising:
Be divided at least two regions to be encoded according to the size of the discrete cosine transform coefficient block, it is described at least
Two regions to be encoded are adjacent to each other, and arrange by preset direction, and the size at least two region to be encoded is by default side
To be incremented by；
It is determined according to pre-arranged code rule and is located at the preset direction initial position in described at least two regions to be encoded
Region to be encoded prediction quantization parameter, and according to the quantization parameter in the region to be encoded and prediction quantization parameter determine that it is poor
Quantization parameter；
According to the amount in the region to be encoded for being located at the preset direction initial position in described at least two regions to be encoded
Change parameter and calculates the differential quantization parameter in remaining region to be encoded by putting in order for preset direction.
Optionally, the size according to the discrete cosine transform coefficient block is divided at least two areas to be encoded
Domain includes:
Judge whether the size of the discrete cosine transform coefficient block is less than or equal to default size, if it is, by it
It is divided into the first region to be encoded and the second region to be encoded, wherein second region to be encoded is located at the preset direction
Initial position；If it is not, then being divided at least three regions to be encoded.
Optionally, when the discrete cosine transform coefficient block is divided into the first region to be encoded and the second region to be encoded
When, it is determined in described at least two regions to be encoded positioned at the preset direction initial position according to pre-arranged code rule wait compile
The prediction quantization parameter in code region, and its differential quantization is determined according to the quantization parameter in the region to be encoded and prediction quantization parameter
Parameter includes:
The prediction quantization parameter in the described second region to be encoded is determined according to pre-arranged code rule；
It is poor that the quantization parameter in the described second region to be encoded and the prediction quantization parameter are made, and obtains described second wait compile
The differential quantization parameter in code region.
Optionally, according to the area to be encoded for being located at preset direction position in fact in described at least two regions to be encoded
The quantization parameter in domain is calculated the differential quantization parameter in remaining region to be encoded and is included: by putting in order for preset direction
Using the quantization parameter in the described second region to be encoded as the prediction quantization parameter in the described first region to be encoded；
It is poor that the quantization parameter in the described first region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
Optionally, the value range of the differential quantization parameter in the described first region to be encoded is 0-6, including endpoint value.
Optionally, the quantization parameter in the described first region to be encoded is joined according to the differential quantization in the described first region to be encoded
Several value ranges and prediction quantization parameter determine.
Optionally, when the discrete cosine transform coefficient block is divided into three regions to be encoded, the discrete cosine becomes
Coefficient block is changed to be made of the arrange by preset direction the 5th region, the 4th region to be encoded and third region to be encoded to be encoded,
It is described according to pre-arranged code rule determine in described at least two regions to be encoded positioned at the preset direction initial position to
The prediction quantization parameter of coding region, and its difference component is determined according to the quantization parameter in the region to be encoded and prediction quantization parameter
Changing parameter includes:
The prediction quantization parameter in the 5th region to be encoded is determined according to pre-arranged code rule；
It is poor that the quantization parameter in the 5th region to be encoded and the prediction quantization parameter are made, and obtains the described 5th wait compile
The differential quantization parameter in code region.
Optionally, it is described according in described at least two regions to be encoded be located at the preset direction in fact position wait compile
The quantization parameter in code region is calculated the differential quantization parameter in remaining region to be encoded and is included: by putting in order for preset direction
Using the quantization parameter in the 5th region to be encoded as the prediction quantization parameter in the 4th region to be encoded；
It is poor that the quantization parameter in the 4th region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter；
Using the quantization parameter in the 4th region to be encoded as the prediction quantization parameter in third region to be encoded；
It is poor that the quantization parameter in third region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
A kind of determination system of differential quantization parameter, the amount applied to discrete cosine transform coefficient block in image encoding process
Change process, comprising:
Region division module, for according to the size of the discrete cosine transform coefficient block be divided at least two to
Coding region, at least two region to be encoded is adjacent to each other, and arranges by preset direction, at least two area to be encoded
The size in domain is incremented by by preset direction；
First coding module, for being determined in described at least two regions to be encoded according to pre-arranged code rule positioned at described
The prediction quantization parameter in the region to be encoded of preset direction initial position, and according to the quantization parameter in the region to be encoded and prediction
Quantization parameter determines its differential quantization parameter；
Second coding module, for according in described at least two regions to be encoded be located at the preset direction initial position
The quantization parameter in region to be encoded calculate the differential quantization parameter in remaining region to be encoded by putting in order for preset direction.
Optionally, the region division module is divided at least according to the size of the discrete cosine transform coefficient block
Two regions to be encoded specifically include:
Judge whether the size of the discrete cosine transform coefficient block is less than or equal to default size, if it is, by it
It is divided into the first region to be encoded and the second region to be encoded, wherein second region to be encoded is located at the preset direction
Initial position, if it is not, then being divided at least three regions to be encoded.
Optionally, when the discrete cosine transform coefficient block is divided into the first region to be encoded and the second region to be encoded
When, first coding module is specifically used for, and determines that the prediction in the described second region to be encoded quantifies according to pre-arranged code rule
Parameter, and the quantization parameter in the described second region to be encoded and prediction quantization parameter work is poor, described second is obtained wait compile
The differential quantization parameter in code region.
Optionally, second coding module is specifically used for, using the quantization parameter in the described second region to be encoded as institute
State the prediction quantization parameter in the first region to be encoded；
It is poor that the quantization parameter in the described first region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
Optionally, the value range of the differential quantization parameter in the described first region to be encoded is 0-6, including endpoint value.
Optionally, the quantization parameter in the described first region to be encoded is joined according to the differential quantization in the described first region to be encoded
Several value ranges and prediction quantization parameter determine.
Optionally, when the discrete cosine transform coefficient block is divided into three regions to be encoded, the discrete cosine becomes
Coefficient block is changed to be made of the arrange by preset direction the 5th region, the 4th region to be encoded and third region to be encoded to be encoded,
First coding module is specifically used for determining the prediction quantization parameter in the 5th region to be encoded according to pre-arranged code rule；
It is poor that the quantization parameter in the 5th region to be encoded and the prediction quantization parameter are made, and obtains the described 5th wait compile
The differential quantization parameter in code region.
Optionally, second coding module is specifically used for the quantization parameter in the 5th region to be encoded as described in
The prediction quantization parameter in the 4th region to be encoded；
It is poor that the quantization parameter in the 4th region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter；
Using the quantization parameter in the 4th region to be encoded as the prediction quantization parameter in third region to be encoded；
It is poor that the quantization parameter in third region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
A kind of video encoder, the determination system including differential quantization parameter as described in any one of the above embodiments.
It can be seen from the above technical proposal that the embodiment of the invention provides a kind of differential quantization determination method for parameter,
Determine system and video encoder, wherein the differential quantization determination method for parameter is first according to the discrete cosine transform
The size of coefficient block is divided at least two regions to be encoded, then determines described at least two according to pre-arranged code rule
It is located at the prediction quantization parameter in the region to be encoded of the preset direction initial position in region to be encoded, and to be encoded according to this
The quantization parameter and prediction quantization parameter in region determine its differential quantization parameter, finally according to described at least two regions to be encoded
In be located at the quantization parameter in region to be encoded of the preset direction initial position and calculate residue by putting in order for preset direction
The differential quantization parameter in region to be encoded.In compared to the prior art one can only be determined to a discrete cosine transform coefficient block
The method of differential quantization parameter is compared, and the differential quantization determination method for parameter can be according to the discrete cosine transform coefficient
The size of block be its determine at least two differential quantization parameters so that the differential quantization parameter can preferably with it is described discrete
Cosine transform coefficient block is matched, to realize the mesh for carrying out more preferably quantification treatment to the discrete cosine transform coefficient block
, and then improve the efficiency of Video coding.
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 schematic diagram of the positional relationship of discrete cosine transform coefficient block in the prior art；
Fig. 2 is a kind of flow diagram for differential quantization determination method for parameter that one embodiment of the application provides；
Fig. 3 is a kind of composition schematic diagram for discrete cosine transform coefficient block that one embodiment of the application provides；
Fig. 4 is a kind of composition schematic diagram for discrete cosine transform coefficient block that another embodiment of the application provides；
Fig. 5 is a kind of process signal for differential quantization determination method for parameter that another embodiment of the application provides
Figure；
Fig. 6 is a kind of process signal for differential quantization determination method for parameter that another embodiment of the application provides
Figure；
Fig. 7 is a kind of process signal for differential quantization determination method for parameter that the further embodiment of the application provides
Figure；
Fig. 8 is a kind of structural schematic diagram of the determination system for differential quantization parameter that one embodiment of the application provides.
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.
The embodiment of the present application provides a kind of differential quantization determination method for parameter, encodes as shown in Fig. 2, being applied to image
The quantizing process of discrete cosine transform coefficient block in the process, comprising:
S101: at least two regions to be encoded, institute are divided into according to the size of the discrete cosine transform coefficient block
It is adjacent to each other to state at least two regions to be encoded, and is arranged by preset direction, the size at least two region to be encoded is pressed
Preset direction is incremented by；
S102: determine that being located at the preset direction in described at least two regions to be encoded originates according to pre-arranged code rule
The prediction quantization parameter in the region to be encoded of position, and determined according to the quantization parameter in the region to be encoded and prediction quantization parameter
Its differential quantization parameter；
S103: according to the region to be encoded for being located at the preset direction initial position in described at least two regions to be encoded
Quantization parameter calculate the differential quantization parameter in remaining region to be encoded by putting in order for preset direction.
With reference to Fig. 3 and Fig. 4, arrow direction is the preset direction in figs. 3 and 4, more specifically, reference
Fig. 3, the preset direction are that the upper left endpoint SP of the discrete cosine transform coefficient block is directed toward the direction of bottom right endpoint DP.
It should be noted that the discrete cosine transform coefficient block refers to image block in the intermediate product of cataloged procedure, tool
Body, when being encoded to an image block, it is predicted first, obtains prediction block, and using the image block and be somebody's turn to do
Prediction block subtracts each other to obtain residual block, then carries out discrete cosine transform (Discrete corresponding with its size to residual block
Cosine Transform, DCT), to obtain the discrete cosine transform coefficient block.Finally to the discrete cosine transform coefficient
Block is quantified, and the differential quantization parameter of acquisition and quantized-dct coefficient coding are entered code stream.The application is implemented
Quantizing process of the differential quantization determination method for parameter that example provides aiming at the discrete cosine transform coefficient block.It is described
The size of discrete cosine transform coefficient block is identical with the size of initial image block, such as one by 32 pixels × 32 pixels figure
The size of discrete cosine transform coefficient block as block by above process transformation is also 32 pixels × 32 pixels.
Referring still to Fig. 3 and Fig. 4, Fig. 3 and Fig. 4 are the signal for passing through the discrete cosine transform coefficient block after dividing
Figure, in Fig. 3, the discrete cosine transform coefficient block is divided into two regions to be encoded, and respectively 11 and 12, in Fig. 4,
The discrete cosine transform coefficient block is divided into three regions to be encoded, respectively 13,14 and 15.Fig. 3 and Fig. 4 are only enumerated
The schematic diagram of two kinds of possible discrete cosine transform coefficient blocks after dividing, it is described discrete after dividing
Cosine transform coefficient block can also be made of four or five regions to be encoded, and to this and without limitation, specific view is real by the application
Depending on the situation of border.
Still by taking Fig. 3 and Fig. 4 as an example, in Fig. 3, the size in region 12 to be encoded is less than the size in region 11 to be encoded；
In Fig. 4, the size in region 15 to be encoded is less than the size in region 14 to be encoded, and the size in region 14 to be encoded is less than to be encoded
The size in region 13, its pixel quantity of the big little finger of toe in the region to be encoded.
It should also be noted that, positioned at the preset direction initial position wait compile at least two region to be encoded
Code region determines that, in order to reduce the code rate of the quantization parameter, the pre-arranged code rule is preferably according to pre-arranged code rule
H.265 coding rule.But in the other embodiments of the application, the pre-arranged code rule can also be H.264 coding rule
Or H.264 other coding rules before coding rule generates, the application to the specific type of the pre-arranged code rule not
It limits, specifically depending on actual conditions.
With reference to Fig. 3, in Fig. 3, at least two region to be encoded positioned at the preset direction initial position to
Coding region is region 12 to be encoded；In Fig. 4, the preset direction start bit is located at least two region to be encoded
The region to be encoded set is region 15 to be encoded.
In the present embodiment, compared to the prior art in can only determine a difference to a discrete cosine transform coefficient block
The method of quantization parameter is compared, and the differential quantization determination method for parameter can be according to the discrete cosine transform coefficient block
Size be its determine at least two differential quantization parameters so that the differential quantization parameter can preferably with the discrete cosine
Transformation coefficient block is matched, thus realize the purpose that more preferably quantification treatment is carried out to the discrete cosine transform coefficient block,
And then improve the efficiency of Video coding.
On the basis of the above embodiments, in one embodiment of the application, as shown in figure 5, it is described according to from
The size for dissipating cosine transform coefficient block is divided at least two regions to be encoded and includes:
S1011: judging whether the size of the discrete cosine transform coefficient block is less than or equal to default size, if so,
Then it is divided into the first region to be encoded and the second region to be encoded, wherein second region to be encoded is located at described pre-
Set direction initial position, if it is not, then being divided at least three regions to be encoded.
It should be noted that when the size of the discrete cosine transform coefficient block is smaller (being less than or equal to default size)
When, it is divided into more than two regions to be encoded and is not necessarily to, can't largely be promoted each wait compile in this way
The differential quantization parameter in code region and the matching degree in the region to be encoded, can't have very great help to code efficiency is promoted.
Therefore, when the size of the discrete cosine transform coefficient block is less than or equal to default size, it is to be encoded to be divided into first
Region and the second region to be encoded.
In addition, the value of the default size is 16 pixels × 16 pixels, in this Shen in one embodiment of the application
In other embodiments please, the default size can also be 12 pixels × 12 pixels or 24 pixels × 24 pixels, the application couple
The specific value of the default size and without limitation, specifically depending on actual conditions.
On the basis of the above embodiments, in another embodiment of the application, with reference to Fig. 3 and Fig. 6, when described discrete
It is described according to pre-arranged code rule when cosine transform coefficient block is divided into first region 11 and the second region 12 to be encoded to be encoded
Determine that the prediction quantization in the region to be encoded in described at least two regions to be encoded positioned at the preset direction initial position is joined
Number, and determine that its differential quantization parameter includes: according to the quantization parameter in the region to be encoded and prediction quantization parameter
S1021: the prediction quantization parameter in the described second region 12 to be encoded is determined according to pre-arranged code rule；
S1022: it is poor that the quantization parameter in the described second region 12 to be encoded and the prediction quantization parameter are made, described in acquisition
The differential quantization parameter in the second region 12 to be encoded.
Likewise, H.265 the pre-arranged code rule for carrying out coding use to the described second region 12 to be encoded is preferably compiled
Other coding rules of code rule but it is also possible to be H.264 coding rule or H.264 before coding rule generation.
Correspondingly, in the present embodiment, it is described according in described at least two regions to be encoded referring still to Fig. 3 and Fig. 6
Quantization parameter positioned at the region to be encoded of the preset direction initial position successively calculates the difference component in remaining region to be encoded
Changing parameter includes:
S1031: using the quantization parameter in the described second region 12 to be encoded as the prediction in the described first region 11 to be encoded
Quantization parameter；
S1032: it is poor that the quantization parameter in the described first region 11 to be encoded and prediction quantization parameter are made, and obtains its difference component
Change parameter.
On the basis of the above embodiments, in another embodiment of the application, with reference to Fig. 4 and Fig. 7, when described discrete
When cosine transform coefficient block is divided into three regions to be encoded, the discrete cosine transform coefficient block is by from left to bottom right successively
The region 15 to be encoded of the 5th of arrangement, the 4th region 14 to be encoded and third region 13 to be encoded are constituted, and the basis is default to be compiled
Code rule determines the prediction for being located at the region to be encoded of the preset direction initial position at least two region to be encoded
Quantization parameter, and determine that its differential quantization parameter includes: according to the quantization parameter in the region to be encoded and prediction quantization parameter
S1023: the prediction quantization parameter in the described 5th region 15 to be encoded is determined according to pre-arranged code rule；
S1024: it is poor that the quantization parameter in the described 5th region 15 to be encoded and the prediction quantization parameter are made, described in acquisition
The differential quantization parameter in the 5th region 15 to be encoded.
Likewise, H.265 the pre-arranged code rule for carrying out coding use to the described 5th region 15 to be encoded is preferably compiled
Other coding rules of code rule but it is also possible to be H.264 coding rule or H.264 before coding rule generation.
Correspondingly, in the present embodiment, it is described according in described at least two regions to be encoded referring still to Fig. 4 and Fig. 7
Quantization parameter positioned at the region to be encoded of the preset direction initial position successively calculates the difference component in remaining region to be encoded
Changing parameter includes:
S1033: using the quantization parameter in the described 5th region 15 to be encoded as the prediction in the described 4th region 14 to be encoded
Quantization parameter；
S1034: it is poor that the quantization parameter in the described 4th region 14 to be encoded and prediction quantization parameter are made, and obtains its difference component
Change parameter；
S1035: using the quantization parameter in the described 4th region 14 to be encoded as the prediction in third region 13 to be encoded
Quantization parameter；
S1036: it is poor that the quantization parameter in third region 13 to be encoded and prediction quantization parameter are made, and obtains its difference component
Change parameter.
On the basis of the above embodiments, in the preferred embodiment of the application, first region 11 to be encoded
Value range with the differential quantization parameter in third region 13 to be encoded is 0-6, including endpoint value.
In order to which quality of the video after coding considers that preset direction described in each discrete cosine transform coefficient block terminates
The region to be encoded (being the described first region 11 to be encoded in Fig. 3, be third region 13 to be encoded in Fig. 4) of position
The value range of differential quantization parameter need to set, in the other embodiments of the application, first region 11 to be encoded
Value range with the differential quantization parameter in third region 13 to be encoded can also be 0-3, including endpoint value or 0-4, including end
Point value.Specific value model of the application to the differential quantization parameter in the described first region 11 to be encoded and third region 13 to be encoded
It encloses and without limitation, specifically depending on actual conditions.
On the basis of the above embodiments, in another preferred embodiment of the application, first region to be encoded
11 quantization parameter is true according to the value range and prediction quantization parameter of the differential quantization parameter in the described first region 11 to be encoded
It is fixed；
The quantization parameter in the third region 13 to be encoded is according to the differential quantization parameter in third region 13 to be encoded
Value range and prediction quantization parameter determine.
Specifically, video encoder needs to guarantee each when determining its quantization parameter for each region to be encoded
The quantization parameter in the region to be encoded subtracts the difference that the differential quantization parameter that it predicts to obtain after quantization parameter is in setting
In the value range of quantization parameter.
Correspondingly, the embodiment of the present application also provides a kind of determination systems of differential quantization parameter to be applied to reference to Fig. 8
The quantizing process of discrete cosine transform coefficient block in image encoding process, comprising:
Region division module 100, for being divided at least two according to the size of the discrete cosine transform coefficient block
A region to be encoded, at least two region to be encoded is adjacent to each other, and arranges by preset direction, and described at least two wait compile
The size in code region is incremented by by preset direction；
First coding module 200 is located at for being determined in described at least two regions to be encoded according to pre-arranged code rule
The prediction quantization parameter in the region to be encoded of the preset direction initial position, and according to the quantization parameter in the region to be encoded and
Prediction quantization parameter determines its differential quantization parameter；
Second coding module 300, for being originated according in described at least two regions to be encoded positioned at the preset direction
The quantization parameter in the region to be encoded of position calculates the differential quantization ginseng in remaining region to be encoded by putting in order for preset direction
Number.
With reference to Fig. 3 and Fig. 4, arrow direction is the preset direction in figs. 3 and 4, more specifically, reference
Fig. 3, the preset direction are that the upper left endpoint SP of the discrete cosine transform coefficient block is directed toward the direction of bottom right endpoint DP.
It should be noted that the discrete cosine transform coefficient block refers to image block in the intermediate product of cataloged procedure, tool
Body, when being encoded to an image block, it is predicted first, obtains prediction block, and using the image block and be somebody's turn to do
Prediction block subtracts each other to obtain residual block, then carries out discrete cosine transform (Discrete corresponding with its size to residual block
Cosine Transform, DCT), to obtain the discrete cosine transform coefficient block.Finally to the discrete cosine transform coefficient
Block is quantified, and the differential quantization parameter of acquisition and quantized-dct coefficient coding are entered code stream.The application is implemented
Quantizing process of the determination system for the differential quantization parameter that example provides aiming at the discrete cosine transform coefficient block.It is described
The size of discrete cosine transform coefficient block is identical with the size of initial image block, such as one by 32 pixels × 32 pixels figure
The size of discrete cosine transform coefficient block as block by above process transformation is also 32 pixels × 32 pixels.
Referring still to Fig. 3 and Fig. 4, Fig. 3 and Fig. 4 are the signal for passing through the discrete cosine transform coefficient block after dividing
Figure, in Fig. 3, the discrete cosine transform coefficient block is divided into two regions to be encoded, and respectively 11 and 12, in Fig. 4,
The discrete cosine transform coefficient block is divided into three regions to be encoded, respectively 13,14 and 15.Fig. 3 and Fig. 4 are only enumerated
The schematic diagram of two kinds of possible discrete cosine transform coefficient blocks after dividing, it is described discrete after dividing
Cosine transform coefficient block can also be made of four or five regions to be encoded, and to this and without limitation, specific view is real by the application
Depending on the situation of border.
Still by taking Fig. 3 and Fig. 4 as an example, in Fig. 3, the size in region 12 to be encoded is less than the size in region 11 to be encoded；
In Fig. 4, the size in region 15 to be encoded is less than the size in region 14 to be encoded, and the size in region 14 to be encoded is less than to be encoded
The size in region 13, its pixel quantity of the big little finger of toe in the region to be encoded.
It should also be noted that, positioned at the preset direction initial position wait compile at least two region to be encoded
Code region determines that, in order to reduce the code rate of the quantization parameter, the pre-arranged code rule is preferably according to pre-arranged code rule
H.265 coding rule.But in the other embodiments of the application, the pre-arranged code rule can also be H.264 coding rule
Or H.264 other coding rules before coding rule generates, the application to the specific type of the pre-arranged code rule not
It limits, specifically depending on actual conditions.
With reference to Fig. 3, in Fig. 3, at least two region to be encoded positioned at the preset direction initial position to
Coding region is region 12 to be encoded；In Fig. 4, the preset direction start bit is located at least two region to be encoded
The region to be encoded set is region 15 to be encoded.
In the present embodiment, compared to the prior art in can only determine a difference to a discrete cosine transform coefficient block
The method of quantization parameter is compared, and the determination system of the differential quantization parameter can be according to the discrete cosine transform coefficient block
Size be its determine at least two differential quantization parameters so that the differential quantization parameter can preferably with the discrete cosine
Transformation coefficient block is matched, thus realize the purpose that more preferably quantification treatment is carried out to the discrete cosine transform coefficient block,
And then improve the efficiency of Video coding.
On the basis of the above embodiments, in one embodiment of the application, the region division module 100 is according to institute
The size for stating discrete cosine transform coefficient block is divided at least two regions to be encoded and specifically includes:
Judge whether the size of the discrete cosine transform coefficient block is less than or equal to default size, if it is, by it
It is divided into the first region 11 and the second region 12 to be encoded to be encoded, wherein second region 12 to be encoded is located at described pre-
Set direction initial position, if it is not, then being divided at least three regions to be encoded.
It should be noted that when the size of the discrete cosine transform coefficient block is smaller (being less than or equal to default size)
When, it is divided into more than two regions to be encoded and is not necessarily to, can't largely be promoted each wait compile in this way
The differential quantization parameter in code region and the matching degree in the region to be encoded, can't have very great help to code efficiency is promoted.
Therefore, when the size of the discrete cosine transform coefficient block is less than or equal to default size, it is to be encoded to be divided into first
Region 11 and the second region 12 to be encoded.
In addition, the value of the default size is 16 pixels × 16 pixels, in this Shen in one embodiment of the application
In other embodiments please, the default size can also be 12 pixels × 12 pixels or 24 pixels × 24 pixels, the application couple
The specific value of the default size and without limitation, specifically depending on actual conditions.
On the basis of the above embodiments, in another embodiment of the application, with reference to Fig. 3, when the discrete cosine
When transformation coefficient block is divided into first region 11 and the second region 12 to be encoded to be encoded, first coding module 200 is specific
For determining the prediction quantization parameter in the described second region 12 to be encoded according to pre-arranged code rule, and it is to be encoded by described second
It is poor that the quantization parameter in region 12 and the prediction quantization parameter are made, and obtains the differential quantization ginseng in second region 12 to be encoded
Number.
Likewise, H.265 the pre-arranged code rule for carrying out coding use to the described second region 12 to be encoded is preferably compiled
Other coding rules of code rule but it is also possible to be H.264 coding rule or H.264 before coding rule generation.
Correspondingly, in the present embodiment, referring still to Fig. 3, second coding module 300 is specifically used for, by described
Prediction quantization parameter of the quantization parameter in two regions 12 to be encoded as the described first region 11 to be encoded；
It is poor that the quantization parameter in the described first region 11 to be encoded and prediction quantization parameter are made, and obtains its differential quantization ginseng
Number.
On the basis of the above embodiments, in another embodiment of the application, with reference to Fig. 4, when the discrete cosine
When transformation coefficient block is divided into three regions to be encoded, the discrete cosine transform coefficient block from left to bottom right by being arranged successively
The 5th region 15 to be encoded, the 4th region 14 to be encoded and third region 13 to be encoded constitute, first coding module 200
Specifically for determining the prediction quantization parameter in the described 5th region 15 to be encoded according to pre-arranged code rule；
It is poor that the quantization parameter in the described 5th region 15 to be encoded and the prediction quantization parameter are made, acquisition the described 5th to
The differential quantization parameter of coding region 15.
Likewise, H.265 the pre-arranged code rule for carrying out coding use to the described 5th region 15 to be encoded is preferably compiled
Other coding rules of code rule but it is also possible to be H.264 coding rule or H.264 before coding rule generation.
Correspondingly, in the present embodiment, referring still to Fig. 4, second coding module 300 is specifically used for the described 5th
Prediction quantization parameter of the quantization parameter in region 15 to be encoded as the described 4th region 14 to be encoded；
It is poor that the quantization parameter in the described 4th region 14 to be encoded and prediction quantization parameter are made, and obtains its differential quantization ginseng
Number；
Quantify ginseng for the quantization parameter in the described 4th region 14 to be encoded as the prediction in third region 13 to be encoded
Number；
It is poor that the quantization parameter in third region 13 to be encoded and prediction quantization parameter are made, and obtains its differential quantization ginseng
Number.
On the basis of the above embodiments, in the preferred embodiment of the application, first region 11 to be encoded
Value range with the differential quantization parameter in third region 13 to be encoded is 0-6, including endpoint value.
In order to which quality of the video after coding considers that preset direction described in each discrete cosine transform coefficient block terminates
The region to be encoded (being the described first region 11 to be encoded in Fig. 3, be third region 13 to be encoded in Fig. 4) of position
The value range of differential quantization parameter need to set, in the other embodiments of the application, first region 11 to be encoded
Value range with the differential quantization parameter in third region 13 to be encoded can also be 0-3, including endpoint value or 0-4 include end
Point value.Specific value model of the application to the differential quantization parameter in the described first region 11 to be encoded and third region 13 to be encoded
It encloses and without limitation, specifically depending on actual conditions.
On the basis of the above embodiments, in another preferred embodiment of the application, first region to be encoded
11 quantization parameter is true according to the value range and prediction quantization parameter of the differential quantization parameter in the described first region 11 to be encoded
It is fixed；
The quantization parameter in the third region 13 to be encoded is according to the differential quantization parameter in third region 13 to be encoded
Value range and prediction quantization parameter determine.
Specifically, video encoder needs to guarantee each when determining its quantization parameter for each region to be encoded
The quantization parameter in the region to be encoded subtracts the difference that the differential quantization parameter that it predicts to obtain after quantization parameter is in setting
In the value range of quantization parameter.
Correspondingly, the embodiment of the present application also provides a kind of video encoder, including difference described in any of the above-described embodiment
The determination system of quantization parameter.
In conclusion the embodiment of the present application provides a kind of differential quantization determination method for parameter, determines system and video
Encoder, wherein the differential quantization determination method for parameter first will according to the size of the discrete cosine transform coefficient block
It is divided at least two regions to be encoded, then determines position in described at least two regions to be encoded according to pre-arranged code rule
Prediction quantization parameter in the region to be encoded of the preset direction initial position, and according to the quantization parameter in the region to be encoded
Its differential quantization parameter is determined with prediction quantization parameter, it is finally described default according to being located in described at least two regions to be encoded
The quantization parameter in the region to be encoded of direction initial position calculates the difference in remaining region to be encoded by putting in order for preset direction
Quantization parameter.In compared to the prior art a differential quantization parameter can only be determined to a discrete cosine transform coefficient block
Method is compared, and the differential quantization determination method for parameter can be that it is true according to the size of the discrete cosine transform coefficient block
Fixed at least two differential quantization parameters so that the differential quantization parameter can preferably with the discrete cosine transform coefficient block
It is matched, to realize the purpose for carrying out more preferably quantification treatment to the discrete cosine transform coefficient block, and then improves view
The efficiency of frequency coding.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
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 (17)
1. a kind of differential quantization determination method for parameter, which is characterized in that be applied to discrete cosine transform in image encoding process
The quantizing process of coefficient block, comprising:
At least two regions to be encoded are divided into according to the size of the discrete cosine transform coefficient block, described at least two
Region to be encoded is adjacent to each other, and arranges by preset direction, and the size at least two region to be encoded is passed by preset direction
Increase；
According to pre-arranged code rule determine in described at least two regions to be encoded positioned at the preset direction initial position to
The prediction quantization parameter of coding region, and its difference component is determined according to the quantization parameter in the region to be encoded and prediction quantization parameter
Change parameter；
According to the quantization ginseng in the region to be encoded for being located at the preset direction initial position in described at least two regions to be encoded
Number calculates the differential quantization parameter in remaining region to be encoded by putting in order for preset direction；
The amount according to the region to be encoded for being located at the preset direction initial position in described at least two regions to be encoded
Change parameter to be calculated the differential quantization parameter in remaining region to be encoded by putting in order for preset direction and included:
By putting in order for preset direction, the quantization parameter in a region to be encoded upper in described at least two regions to be encoded is made
For the prediction quantization parameter in next adjacent region to be encoded, so that next adjacent region to be encoded quantifies quantization parameter and prediction
Differential quantization parameter of the difference of parameter as next adjacent region to be encoded.
2. differential quantization determination method for parameter according to claim 1, which is characterized in that described according to described discrete remaining
The size of string transformation coefficient block is divided at least two regions to be encoded
Judge whether the size of the discrete cosine transform coefficient block is less than or equal to default size, if it is, being divided
For the first region to be encoded and the second region to be encoded, wherein second region to be encoded is located at rising for the preset direction
Beginning position；If it is not, then being divided at least three regions to be encoded.
3. differential quantization determination method for parameter according to claim 2, which is characterized in that when the discrete cosine transform
When coefficient block is divided into first region and the second region to be encoded to be encoded, described at least two are determined according to pre-arranged code rule
It is located at the prediction quantization parameter in the region to be encoded of the preset direction initial position in region to be encoded, and to be encoded according to this
The quantization parameter and prediction quantization parameter in region determine that its differential quantization parameter includes:
The prediction quantization parameter in the described second region to be encoded is determined according to pre-arranged code rule；
It is poor that the quantization parameter in the described second region to be encoded and the prediction quantization parameter are made, and obtains second area to be encoded
The differential quantization parameter in domain.
4. differential quantization determination method for parameter according to claim 3, which is characterized in that according to described at least two to
It is located at quantization parameter the putting in order by preset direction in the region to be encoded of the preset direction initial position in coding region
The differential quantization parameter for calculating remaining region to be encoded includes:
Using the quantization parameter in the described second region to be encoded as the prediction quantization parameter in the described first region to be encoded；
It is poor that the quantization parameter in the described first region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
5. differential quantization determination method for parameter according to claim 3, which is characterized in that first region to be encoded
The value range of differential quantization parameter be 0-6, including endpoint value.
6. differential quantization determination method for parameter according to claim 5, which is characterized in that first region to be encoded
Quantization parameter determined according to the value range and prediction quantization parameter of the differential quantization parameter in the described first region to be encoded.
7. differential quantization determination method for parameter according to claim 2, which is characterized in that when the discrete cosine transform
When coefficient block is divided into three regions to be encoded, the discrete cosine transform coefficient block by preset direction by being arranged the 5th wait compile
Code region, the 4th region to be encoded and third region to be encoded are constituted, described to determine described at least two according to pre-arranged code rule
It is located at the prediction quantization parameter in the region to be encoded of the preset direction initial position in a region to be encoded, and waits compiling according to this
The quantization parameter and prediction quantization parameter in code region determine that its differential quantization parameter includes:
The prediction quantization parameter in the 5th region to be encoded is determined according to pre-arranged code rule；
It is poor that the quantization parameter in the 5th region to be encoded and the prediction quantization parameter are made, and obtains the 5th area to be encoded
The differential quantization parameter in domain.
8. differential quantization determination method for parameter according to claim 7, which is characterized in that described at least two according to
Quantization parameter in a region to be encoded positioned at the region to be encoded of the preset direction initial position presses the arrangement of preset direction
The differential quantization parameter that sequence calculates remaining region to be encoded includes:
Using the quantization parameter in the 5th region to be encoded as the prediction quantization parameter in the 4th region to be encoded；
It is poor that the quantization parameter in the 4th region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter；
Using the quantization parameter in the 4th region to be encoded as the prediction quantization parameter in third region to be encoded；
It is poor that the quantization parameter in third region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
9. a kind of determination system of differential quantization parameter, which is characterized in that be applied to discrete cosine transform in image encoding process
The quantizing process of coefficient block, comprising:
Region division module, it is to be encoded for being divided at least two according to the size of the discrete cosine transform coefficient block
Region, at least two region to be encoded is adjacent to each other, and arranges by preset direction, at least two region to be encoded
Size is incremented by by preset direction；
First coding module is located at described preset for determining according to pre-arranged code rule in described at least two regions to be encoded
The prediction quantization parameter in the region to be encoded of direction initial position, and quantified according to the quantization parameter in the region to be encoded and prediction
Parameter determines its differential quantization parameter；
Second coding module, for according in described at least two regions to be encoded be located at the preset direction initial position to
The quantization parameter of coding region calculates the differential quantization parameter in remaining region to be encoded by putting in order for preset direction；
Second coding module is specifically used for putting in order by preset direction, in described at least two regions to be encoded
Prediction quantization parameter of the quantization parameter in one region to be encoded as next adjacent region to be encoded, so that next adjacent to be encoded
Region is using the difference of quantization parameter and prediction quantization parameter as the differential quantization parameter in next adjacent region to be encoded.
10. the determination system of differential quantization parameter according to claim 9, which is characterized in that the region division module
At least two regions to be encoded are divided into according to the size of the discrete cosine transform coefficient block to specifically include:
Judge whether the size of the discrete cosine transform coefficient block is less than or equal to default size, if it is, being divided
For the first region to be encoded and the second region to be encoded, wherein second region to be encoded is located at rising for the preset direction
Beginning position, if it is not, then being divided at least three regions to be encoded.
11. the determination system of differential quantization parameter according to claim 10, which is characterized in that when the discrete cosine becomes
When changing coefficient block and being divided into first region and the second region to be encoded to be encoded, first coding module is specifically used for, according to
Pre-arranged code rule determines the prediction quantization parameter in the described second region to be encoded, and by the quantization in the described second region to be encoded
It is poor that parameter and the prediction quantization parameter are made, and obtains the differential quantization parameter in second region to be encoded.
12. the determination system of differential quantization parameter according to claim 11, which is characterized in that second coding module
It is specifically used for, using the quantization parameter in the described second region to be encoded as the prediction quantization parameter in the described first region to be encoded；
It is poor that the quantization parameter in the described first region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
13. the determination system of differential quantization parameter according to claim 11, which is characterized in that first area to be encoded
The value range of the differential quantization parameter in domain is 0-6, including endpoint value.
14. the determination system of differential quantization parameter according to claim 13, which is characterized in that first area to be encoded
The quantization parameter in domain is determined according to the value range and prediction quantization parameter of the differential quantization parameter in the described first region to be encoded.
15. the determination system of differential quantization parameter according to claim 10, which is characterized in that when the discrete cosine becomes
When changing coefficient block and being divided into three regions to be encoded, the discrete cosine transform coefficient block by arranged by preset direction the 5th to
Coding region, the 4th region to be encoded and third region to be encoded are constituted, and first coding module is specifically used for according to default
Coding rule determines the prediction quantization parameter in the 5th region to be encoded；
It is poor that the quantization parameter in the 5th region to be encoded and the prediction quantization parameter are made, and obtains the 5th area to be encoded
The differential quantization parameter in domain.
16. the determination system of differential quantization parameter according to claim 15, which is characterized in that second coding module
Specifically for using the quantization parameter in the 5th region to be encoded as the prediction quantization parameter in the 4th region to be encoded；
It is poor that the quantization parameter in the 4th region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter；
Using the quantization parameter in the 4th region to be encoded as the prediction quantization parameter in third region to be encoded；
It is poor that the quantization parameter in third region to be encoded and prediction quantization parameter are made, and obtains its differential quantization parameter.
17. a kind of video encoder, which is characterized in that including such as the described in any item differential quantization parameters of claim 9-16
Determine system.
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| CN104412592A (en) * | 2012-06-26 | 2015-03-11 | 三菱电机株式会社 | Moving image encoding/decoding devices and methods |
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