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WO2012097746A1 - Méthode et dispositif de codage-décodage - Google Patents

Méthode et dispositif de codage-décodage Download PDF

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Publication number
WO2012097746A1
WO2012097746A1 PCT/CN2012/070606 CN2012070606W WO2012097746A1 WO 2012097746 A1 WO2012097746 A1 WO 2012097746A1 CN 2012070606 W CN2012070606 W CN 2012070606W WO 2012097746 A1 WO2012097746 A1 WO 2012097746A1
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WIPO (PCT)
Prior art keywords
sub
reference pixel
block
image block
obtaining
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PCT/CN2012/070606
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English (en)
Chinese (zh)
Inventor
赖昌材
曹潇然
何芸
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Tsinghua University
Huawei Technologies Co Ltd
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Tsinghua University
Huawei Technologies Co Ltd
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Publication of WO2012097746A1 publication Critical patent/WO2012097746A1/fr
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding

Definitions

  • the present invention relates to video codec technology. Background technique
  • the basic principle of video coding compression is to remove redundancy as much as possible by using the correlation between airspace, time domain and codewords.
  • the current popular practice is to use a block-based hybrid video coding framework to implement video coding compression through steps such as prediction, transform, quantization, and entropy coding.
  • This coding framework shows a resilience, from the earliest MPEG-1 to the latest video coding standard H.264/AVC, and even the JCTVC working group (the joint working group established by MPEG and VECG) is developing the next generation.
  • the video coding compression standard HEVC still uses this block-based hybrid video coding framework.
  • Block-based spatial domain predictive coding techniques are generally used in video coding and decoding.
  • the basic principle is to divide the block to be coded into multiple sub-blocks, and then remove the spatial redundancy by using the correlation between the image block to be encoded and the adjacent block. That is, the sub-image block is predicted by using the adjacent block as a reference block.
  • image block division there is a division method in the industry in which a current coded image block is divided into sub-image blocks arranged in a horizontal direction and a vertical direction by parallel division lines, and then prediction is performed in units of these sub-image blocks.
  • prediction reference can be made to the newly introduced UDI prediction technology in the industry, and the 34 prediction modes are traversed from 45 sub-image blocks for prediction, and finally the prediction direction with the lowest rate distortion cost for the sub-image block is selected as The prediction direction of all the pixels in the current sub-image block, and the residual data of the corresponding generated sub-image block is obtained.
  • the process of prediction it is necessary to obtain a reference pixel value of the reference pixel according to the prediction mode, obtain a predicted pixel value of the sub-image block according to the reference pixel value, and further determine a code rate distortion cost under the current prediction mode.
  • the inventor found a problem in the implementation, that is, when using this method for prediction, since the sub-image blocks are sequentially arranged, the reference pixel points corresponding to each sub-image block are due to the difference in position.
  • the pixel values of the reference pixel points that can be used in prediction of all the sub-image blocks of the current coded image block are read into the reference pixel buffer, but some sub-image blocks are used.
  • the prediction only needs to refer to some reference pixels in the pixel buffer, which is easy to be messed up in the process of extracting these reference pixels. Order or error. Summary of the invention
  • the present invention provides an encoding method, including: dividing a current encoding object to obtain sub-image blocks arranged in a horizontal or vertical direction; obtaining an index value of the sub-image block, wherein the index value is used to represent Determining the ordering information of the sub-image block; obtaining, according to the index value, the size specification of the sub-image block, and the preset prediction mode, a reference pixel point required for the sub-image block to perform prediction, and obtaining the reference a reference pixel value of the pixel; predicting the sub-image block according to the reference pixel value and a preset prediction mode to obtain residual data; transforming, quantizing, and entropy encoding the residual data to obtain an encoding The remaining residual data; the division mode information of the current coding target, the coded residual data, and the prediction mode information of the sub-picture block are written into the code stream.
  • the present invention further provides a corresponding decoding method, including: parsing residual data from a code stream, a division mode of a current decoding object, and prediction mode information of a current decoding object; and the current decoding object according to the division mode information Dividing into sub-image blocks arranged in a horizontal direction or a vertical direction; obtaining an index value of the sub-image block, wherein the index value is used to represent ranking information of the sub-image block; according to the index value, Determining a size specification of the sub-image block, and the prediction mode, obtaining a reference pixel point required for prediction by the sub-image block, and obtaining a reference pixel value of the reference pixel point; according to the reference pixel value and the Residual data, obtaining reconstructed pixel values of the sub-image block.
  • the present invention also provides a codec device to which the codec method is applied.
  • FIG. 1 is a schematic diagram of an encoding method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a decoding method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of an encoding apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a decoding apparatus according to an embodiment of the present invention. detailed description
  • an embodiment of the present invention provides an encoding method, including:
  • Step 101 Divide the current coding object to obtain sub-image blocks arranged in a horizontal or vertical direction.
  • the current encoding object is divided into a plurality of sub-image blocks arranged in the horizontal direction by a plurality of vertical dividing lines, or the current encoding object is divided into a plurality of horizontal dividing lines and arranged in a plurality of vertical dividing lines.
  • Sub-image block In the embodiment of the present invention, the size specifications of the sequentially arranged sub-image blocks are the same.
  • Step 102 Obtain an index value of the sub-image block, where the index value is used to indicate ranking information of the sub-image block;
  • the current encoding object is divided into four sub-image blocks 0, 1, 2, 3, which are sequentially arranged, wherein "0, 1, 2, 3" are the index values of the sub-image blocks, and according to these index values
  • the sorting sequence of the sub-image block can also obtain the position information of the sub-image block according to the sorting sequence, for example, when the current encoding object is divided into four sub-image blocks 0, 1, 2, 3 arranged in the horizontal direction, the index A sub-image block with a value of 0 is on the left border of the current encoding object, and a sub-image block with an index value of 1 is adjacent to the sub-image block with an index value of 0, and the sub-image block with an index value of 3 is currently encoded.
  • the sub-image block with index value 2 is between sub-image blocks with index values of 1 and 3. From another perspective, the index value can also be used to represent the location information of the sub-image block.
  • Step 103 Obtain, according to the index value, a size specification of the sub-image block, and a preset prediction mode, a reference pixel that is needed when the sub-image block is predicted, and obtain a reference pixel of the reference pixel.
  • Determining, according to the index value, the size specification of the sub-image block, and the preset prediction mode, the reference pixel points required for the sub-image block to perform prediction include: according to a preset prediction mode and the sub a size specification of the image block, obtaining number information of the required reference pixel points; determining start position information of the reference pixel point according to the index value and the size specification of the sub image block; according to the reference pixel point The start position information and the number information obtain reference pixel points from the upper adjacent block, the upper right adjacent block, the left adjacent block, and the lower left adjacent block of the encoding object.
  • the angle of the prediction direction of the measurement mode is 225 degrees, and the angle of the prediction direction of the rightmost prediction mode is 45 degrees, and then the 34 prediction modes of the UDI prediction can be obtained according to the length and width of the sub-image block.
  • the adjacent block for reference of the current coding object is half of its upper adjacent block, upper right adjacent block, left adjacent block, and lower left adjacent block.
  • the reference pixel points of the sub-picture block include upper reference pixel points (sets;) from the upper adjacent block and the upper right adjacent block, and from the left adjacent block and the lower left adjacent block. Left reference pixel point (set).
  • the pixel points on the right boundary of the left adjacent block and the lower left adjacent block of the current encoding object according to the UDI prediction technology All of them need to be reference pixel points, and the pixel points within the predicted angle coverage of the prediction mode in the upper adjacent block and the upper right adjacent block of the current encoding object can be used as reference pixel points of the sub-image block.
  • the determining, according to the index value, the size specification of the sub-image block, and the preset prediction mode, the reference pixel points required for the sub-image block to perform prediction include: according to a preset prediction mode and a Determining a size specification of the sub-image block, obtaining number information of reference points in the upper adjacent block and the upper right adjacent block of the current encoding object; determining, according to the index value and the size specification of the sub-image block The starting position information of the reference pixel points of the upper adjacent block and the upper right adjacent block of the current encoding object; and the number information of the reference pixel points of the upper adjacent block and the upper right adjacent block of the current encoding object Starting position information, obtaining an upper reference pixel point of the sub-image block in an upper neighboring block and an upper right neighboring block of the current encoding object; according to a preset prediction mode, a left neighboring edge of the current encoding object Obtaining a left reference pixel of the sub-image block in the block and the lower left
  • the pixel points on the lower boundary of the upper adjacent block and the upper right adjacent block of the current encoding object according to the UDI prediction specification All of them need to be reference pixel points, and the pixel points within the prediction angle coverage of the prediction mode in the left adjacent block and the lower left adjacent block of the current encoding object can be used as reference pixel points of the sub-image block.
  • the determining, according to the index value, the size specification of the sub-image block, and the preset prediction mode, the reference pixel points required for the sub-image block to perform prediction include: according to a preset prediction mode and a Determining the size specification of the sub-image block, obtaining the left adjacent block and the lower left adjacent block of the current encoding object And determining, according to the index value and the size specification of the sub-image block, starting position information of reference pixel points of the left adjacent block and the lower left adjacent block of the current encoding object; Obtaining the number in the left neighboring block and the lower left neighboring block of the current encoding object according to the number information and the starting position information of the reference pixel points of the left neighboring block and the lower left neighboring block of the current encoding object a left reference pixel of the sub-image block; obtaining an upper reference pixel of the sub-image block in an upper adjacent block and an upper right adjacent block of the current encoding object according to a preset prediction mode, where Deriving the
  • the pixel value of the reference pixel point may be stored in the reference pixel buffer, in the process of prediction. Extract in order.
  • all the pixels adjacent to the current encoding object in the upper adjacent block, the upper right adjacent block, the left adjacent block, or the lower left adjacent block of the current encoding object may also be written. Into the cache, and then read according to the ordering relationship of the determined reference pixels in all the pixels.
  • Step 104 Perform prediction on the sub-image block according to the reference pixel value and a preset prediction mode, to obtain residual data.
  • Step 105 Perform transform, quantization, and entropy encoding on the residual data to obtain encoded residual data.
  • Step 106 Write the division mode information of the current coding target, the coded residual data, and the prediction mode information of the sub-image block into the code stream.
  • the dividing mode information is used to indicate a direction in which the current encoding object is divided. Specifically, whether the current encoding object is divided into sub-image blocks arranged in the horizontal direction or sub-parameters arranged in the vertical direction. Image block. As for the number of sub-picture blocks, a default value, such as four, may be set at the codec side, or the division direction information of the current coding object and the number of the sub-picture blocks may be simultaneously indicated by the division mode information.
  • the prediction mode information written in the code stream in step 106 mainly means that in the process of predicting the sub-image block, it is finally required to select a reference pixel value and a predicted pixel value obtained in a prediction mode with the lowest rate distortion cost.
  • the information of the prediction mode needs to be also written into the code stream, so that the decoding end can adopt the same prediction mode as the encoding end. Line decoding.
  • the reference pixel points required for prediction are explicitly predicted according to the preset prediction mode, the position and size specifications of the sub-image block in the prediction. In the prediction, only the reference pixel values need to be obtained according to the determined reference pixel points, thereby avoiding out-of-order or error occurrence.
  • an embodiment of the present invention further provides a decoding method corresponding to the foregoing encoding method, including:
  • Step 201 parsing the residual data, the division manner of the current decoding object, and the prediction mode information of the current decoding object from the code stream;
  • Step 202 Divide the current decoding object into sub-image blocks arranged in a horizontal direction or a vertical direction according to the division manner information;
  • Step 203 Obtain an index value of the sub-image block, where the index value is used to indicate ranking information of the sub-image block;
  • Step 204 Obtain, according to the index value, the size specification of the sub-image block, and the prediction mode, a reference pixel point required for prediction by the sub-image block, and obtain a reference pixel value of the reference pixel point. ;
  • Step 205 Obtain a reconstructed pixel value of the sub-image block according to the reference pixel value and the residual data.
  • the obtaining, according to the index value, the size specification of the sub-image block, and the prediction mode information, the reference pixel points required for the sub-image block to perform prediction include: a prediction mode and a size specification of the sub-image block, obtaining number information of required reference pixel points; determining start position information of the reference pixel point according to position information of the sub image block; according to the reference pixel
  • the start position information and the number information of the point, the reference pixel points are obtained from the upper adjacent block, the upper right adjacent block, the left adjacent block, and the lower left adjacent block of the decoding object.
  • the sub-image is confirmed according to the index value, the size specification of the sub-image block, and the prediction mode.
  • the reference pixel points required for the prediction of the block include: obtaining, according to the prediction mode and the size specification of the sub-image block, the number of reference points in the upper adjacent block and the upper right adjacent block of the current decoding object.
  • the reconstructed pixel value of the sub-image block includes: a reference pixel value according to the upper reference pixel point and the left reference pixel point, and the residual data Obtaining a reconstructed pixel value of the sub-image block.
  • the reference pixel required for the prediction includes: obtaining, according to the prediction mode and the size specification of the sub-image block, the number information of the reference points in the left adjacent block and the lower left adjacent block of the current decoding object; Determining, by the index value and the size specification of the sub-image block, determining start position information of reference pixel points of the left adjacent block and the lower left adjacent block of the current decoding object; according to the left adjacent block of the current decoding object Obtaining the number of reference pixel points and the start position information of the lower left adjacent block, obtaining the left reference pixel point of the sub image block in the left adjacent block and the lower left adjacent block of the current decoding object; The prediction mode is obtained by obtaining an upper reference pixel of the sub-image block in an upper adjacent block and an upper right adjacent block of the current decoding object.
  • the reconstructed pixel value of the sub-image block includes: a reference pixel value according to the upper reference pixel point and the left reference pixel point, and the residual data Obtaining a reconstructed pixel value of the sub-image block.
  • a dividing module 301 configured to divide the current encoding object to obtain sub-image blocks arranged in a horizontal or vertical direction;
  • the index value obtaining module 302 is configured to obtain an index value of the sub image block, where the index value is used to represent the sorting information of the sub image block;
  • a reference pixel value obtaining module 303 configured to obtain, according to the index value, a size specification of the sub image block, and a preset prediction mode, a reference pixel point required for the sub image block to perform prediction, and obtain the The reference pixel value of the reference pixel;
  • the residual data obtaining module 304 is configured to perform prediction on the sub-image block according to the reference pixel value and a preset prediction mode, obtain residual data, and transform, quantize, and entropy encode the residual data. To obtain the encoded residual data;
  • a code stream module 305 configured to divide mode information of the current coding object, and the coded residual The data, and prediction mode information of the sub-image block are written to the code stream.
  • the reference pixel value obtaining module 303 further includes:
  • a number obtaining sub-module configured to obtain, according to a preset prediction mode and a size specification of the sub-image block, quantity information of a required reference pixel point;
  • a location obtaining submodule configured to determine start position information of the reference pixel according to the index value and a size specification of the sub image block
  • a reference pixel obtaining submodule configured to use an upper neighboring block, an upper right adjacent block, a left adjacent block, and a lower left adjacent to the encoding object according to the starting position information and the number information of the reference pixel
  • the reference pixel is obtained in the block.
  • the number obtaining sub-module obtains the current according to a preset prediction mode and a size specification of the sub-image block.
  • the position obtaining submodule determining the upper of the current encoding object according to the index value and the size specification of the sub image block Start position information of reference pixels of the adjacent block and the upper right adjacent block; the reference pixel point obtaining sub-module according to the number of reference pixel points of the upper adjacent block and the upper right adjacent block of the current encoding object Information and starting position information, obtaining an upper reference pixel point of the sub-image block in an upper adjacent block and an upper right adjacent block of the current encoding object, and according to a preset prediction mode, in the current encoding object
  • the left reference pixel of the sub-image block is obtained in the left adjacent block and the lower left adjacent block.
  • the number obtaining sub-module obtains the left of the current encoding object according to a preset prediction mode and a size specification of the sub-image block.
  • the number information of the reference points in the adjacent block and the lower left adjacent block; the position obtaining submodule determines the left neighboring block and the lower left phase of the current encoding object according to the index value and the size specification of the sub image block
  • the upper reference pixel of the sub-image block is obtained in
  • an embodiment of the present invention further provides a decoding apparatus that uses the foregoing decoding method, and includes:
  • a parameter obtaining module 401 configured to parse the residual data from the code stream, a division manner of the current decoding object, and prediction mode information of the currently decoded object;
  • a dividing module 402 configured to divide the current decoding object into sub-image blocks arranged in a horizontal direction or a vertical direction according to the dividing mode information
  • An index value obtaining module 403, configured to obtain an index value of the sub-image block, where the index value is used to represent the sorting information of the sub-image block;
  • a reference pixel obtaining module 404 configured to obtain, according to the index value, a size specification of the sub-image block, and the prediction mode, a reference pixel point required for prediction by the sub-image block, and obtain the reference The reference pixel value of the pixel;
  • the reconstruction module 405 is configured to obtain, according to the reference pixel value and the residual data, a reconstructed pixel value of the sub-image block.
  • the reference pixel value obtaining module 404 further includes:
  • a number obtaining submodule configured to obtain, according to the prediction mode and a size specification of the sub image block, quantity information of a required reference pixel point
  • a location obtaining submodule configured to determine start position information of the reference pixel according to the index value and a size specification of the sub image block
  • a reference pixel obtaining submodule configured to use an upper neighboring block, an upper right adjacent block, a left neighboring block, and a lower left phase of the current decoding object according to the starting position information and the number information of the reference pixel point
  • the reference pixel is obtained in the neighboring block.
  • the number obtaining sub-module obtains the current decoding object according to the prediction mode and the size specification of the sub-image block.
  • the number information of the reference points in the upper adjacent block and the upper right adjacent block; the position obtaining submodule determines the upper adjacent block of the current decoding object according to the index value and the size specification of the sub image block And starting position information of the reference pixel of the upper right adjacent block; the reference pixel obtaining sub-module according to the number information of the reference pixel of the upper adjacent block and the upper right adjacent block of the current decoding object
  • Starting position information obtaining the sub-picture in an upper adjacent block and an upper right adjacent block of the current decoding object
  • a reference pixel point above the block, and a left reference pixel of the sub-image block are obtained in a left neighboring block and a lower left neighboring block of the current decoding object according to a prediction mode.
  • the reconstruction module 405 obtains
  • the number obtaining sub-module obtains the left neighboring block of the current decoding object according to the prediction mode and the size specification of the sub-image block. And the number information of the reference points in the lower left adjacent block; the location obtaining submodule determines, according to the index value and the size specification of the sub image block, the left adjacent block and the lower left adjacent block of the current decoding object Reference position information of the reference pixel; the reference pixel obtaining sub-module according to the number information and the starting position information of the reference pixel of the left adjacent block and the lower left adjacent block of the current decoding object, at the current Obtaining a left reference pixel point of the sub-image block in a left neighboring block and a lower left neighboring block of the decoding object, and obtaining an upper neighboring block and an upper right neighboring block of the current decoding object according to a prediction mode The reference pixel point above the sub-image block. Correspondingly, at this time, the
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

L'invention concerne une méthode de codage comprenant : la division de l'objet de codage et l'acquisition de blocs de sous-images disposés séquentiellement dans le sens horizontal et vertical; l'acquisition d'une valeur d'index des blocs de sous--images; en fonction de la valeur d'index, les dimensions des blocs de sous-images, et un modèle de prédiction prédéterminé, l'acquisitiond'un pixel de référence requis pendant la prédiction des blocs de sous-images et l'acquisition d'une valeur de pixel de référence; la prédiction des blocs de sous-images en fonction de la valeur de pixel de référence et du modèle de prédiction prédéterminé, et l'acquisition de données résiduelles; la transformation, la quantification et le codage entropique des données résiduelles pour acquérir les données résiduelles codées; et l'écriture dans un train de code des informations du mécanisme de division pour l'objet de codage courant, les données résiduelles codées, et les informations du modèle de prédiction pour les blocs de sous-images. L'utilisation de la méthode de codage-décodage divulguée dans la présente invention permet, pendant la prédiction, d'acquérir simplement la valeur de pixel de référence en fonction d'un pixel de référence confirmé, et d'empêcher ainsi un déréglage ou une erreur.
PCT/CN2012/070606 2011-01-20 2012-01-19 Méthode et dispositif de codage-décodage Ceased WO2012097746A1 (fr)

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