WO2012119463A1 - 变换系数的编码方法、变换系数的解码方法,和装置 - Google Patents
变换系数的编码方法、变换系数的解码方法,和装置 Download PDFInfo
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- WO2012119463A1 WO2012119463A1 PCT/CN2011/082597 CN2011082597W WO2012119463A1 WO 2012119463 A1 WO2012119463 A1 WO 2012119463A1 CN 2011082597 W CN2011082597 W CN 2011082597W WO 2012119463 A1 WO2012119463 A1 WO 2012119463A1
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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
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/117—Filters, e.g. for pre-processing or post-processing
-
- 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
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/129—Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
-
- 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
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
- H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
-
- 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
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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
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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
- H04N19/63—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets
- H04N19/64—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets characterised by ordering of coefficients or of bits for transmission
- H04N19/645—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets characterised by ordering of coefficients or of bits for transmission by grouping of coefficients into blocks after the transform
-
- 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
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/86—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving reduction of coding artifacts, e.g. of blockiness
-
- 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
- H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
- H04N19/91—Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
Definitions
- the present invention relates to the field of video processing technologies, and in particular, to a coding method of a transform coefficient, a decoding method of a transform coefficient, and an apparatus. Background technique
- entropy coding in video coding technology mainly uses run length coding and arithmetic coding, for example in
- the H.264 coding standard uses two kinds of entropy coding: Context Adaptive Variable Length Coder (CAVLC) and Context Adaptive Binary Arithmetic Coder (CABAC).
- CAVLC Context Adaptive Variable Length Coder
- CABAC Context Adaptive Binary Arithmetic Coder
- the correlation between the encoded information and the current information to be encoded is specifically: using the encoded information to construct a code table or a probability model of the currently encoded information, which is called context-based entropy coding.
- CABAC adopts the idea of arithmetic coding, and its coding performance is better than CAVLC, but the corresponding problem also brings about a large increase in complexity.
- HEVC High Efficiency Video Coding
- ⁇ Encoding a non-zero transform coefficient distribution; in this step, the entire transform coefficient block to be encoded is encoded using a preset scan order, also called: large scan mode, for example: large z-shape (zig-zag)
- a preset scan order also called: large scan mode, for example: large z-shape (zig-zag)
- the manner of the above-mentioned preset scanning sequence may also be a scanning sequence of a large vertical or a large horizontal mode, and a corresponding scanning sequence of a small vertical or small horizontal mode is used in subsequent sub-block encoding;
- each frequency point corresponds to a position in a map.
- the value at the map position is 0; when the frequency point is non-zero, the map is at the position
- the value is 1 and it is judged whether the current frequency is the last non-zero frequency. If yes, the value of the position is 11 (two 1s, not eleven), if not, then the value of this position is 10 (1 and 0, not ten).
- the process of encoding the map if 11 appears in the 0, 1 sequence of the map, it is determined that the coding of one transform coefficient block ends.
- C Encodes the absolute value of coefficeints greater than 1 in sub-block mode, using small zig-zag mode
- D encodes the sign of non-zero coefficeints in sub-block mode, using small zig-zag mode.
- the so-called sub-block mode takes 8x8 transform coefficient block as an example: first edit the upper left 4x4, then the upper right 4x4, then the lower left 4x4, and then the lower right 4x4, the above 4x4 transform coefficient block is the 8x8 transform coefficient block.
- the sub-blocks regarding the scanning order of the large/small zig-zag, as shown in Figs. 1A and 1B, respectively, each small square represents a frequency point, and the numbers in the squares represent the scanning order.
- the scan rules of the scan order of the large/small zig-zag are the same, except that the scan objects are different, so that the entire map of the transform coefficients, the significance map in step A, and the absolute value of the coded transform coefficients in steps B ⁇ D are obtained.
- level the process of encoding the sign of a non-zero transform coefficient is different from the scan order. Because the scanning sequence is different, in the process of performing step A and performing B ⁇ D encoding, the data needs to be read once, and the decoding end needs to perform two kinds of table checking methods corresponding to the two sequences, resulting in high codec efficiency overhead. low efficiency.
- step A if the transform coefficient block is relatively large, usually called a large transform unit, for example, the 32x32 significance map will be relatively large, so the burden of encoding a large significance map in the hardware design is large. Summary of the invention
- the technical problem to be solved by the embodiments of the present invention is to provide a coding method of transform coefficients, a decoding method of transform coefficients, and a device, which reduce coding and decoding overhead and improve coding and decoding efficiency.
- a transform coefficient encoding method including:
- the stored non-zero transform coefficient distribution and the last set of encoded non-zero transform coefficient distributions are encoded into the code stream, and after obtaining the absolute values of the last set of encoded transform coefficients and the sign of the non-zero transform coefficients, The absolute value of the stored transform coefficients and the sign of the non-zero transform coefficients and the absolute values of the last set of encoded transform coefficients and the sign of the non-zero transform coefficients are encoded into the code stream.
- a transform coefficient decoding method includes:
- a transform coefficient encoding apparatus includes:
- a coding unit configured to encode transform coefficients of the transform coefficient block according to a preset scan order, and each set of code sets a number of transform coefficients until the last set of the transform coefficient block is encoded;
- the absolute value of the encoded transform coefficient and the sign of the non-zero transform coefficient After the absolute value of the encoded transform coefficient and the sign of the non-zero transform coefficient, the absolute value of the stored transform coefficient and the sign of the non-zero transform coefficient and the absolute value of the last set of encoded transform coefficients and the non-zero transform
- the sign of the coefficient is programmed into the code stream
- a storage unit configured to store a non-zero transform coefficient distribution obtained by the coding unit, an absolute value of the transform coefficient, and a sign of the non-zero transform coefficient.
- a transform coefficient decoding apparatus includes:
- a decoding unit configured to parse a transform coefficient of the code stream according to a preset scan order, to obtain a distribution of non-zero transform coefficients; and parse the transform coefficient of the code stream with a transform coefficient greater than 1 according to a preset scan order, and the transform coefficient is greater than 1.
- An absolute value, a sign of a non-zero transform coefficient, and each of the set number of transform coefficients of the code stream is parsed.
- the scanning sequence of the encoding significance map is the same as the scanning sequence of the encoding level and the process of encoding the sign.
- the encoding process only needs to read the data once, and the decoding end only needs a sequential check.
- the table mode in addition, splits the significance map into smaller significance maps, thereby reducing the codec overhead and improving the encoding and decoding efficiency.
- Figure 1A is a schematic diagram of a large zig-zag scanning sequence
- Figure 1B is a schematic diagram of a small zig-zag scanning sequence
- FIG. 2 is a schematic flowchart of a method according to an embodiment of the present invention.
- FIG. 3 is a schematic flowchart of a method according to an embodiment of the present invention.
- FIG. 4 is a schematic structural diagram of an encoding apparatus according to an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of a decoding apparatus according to an embodiment of the present invention. detailed description
- a transform coefficient encoding method includes:
- the transform coefficient block in the embodiment of the present invention may be an 8x8 transform coefficient block, or may be a 32x32 transform coefficient block, or may be other size transform coefficient blocks, and the size of the transform coefficient block does not affect the implementation of the embodiment of the present invention.
- the embodiment of the invention is not limited thereto.
- the transform coefficients of the transform coefficient block are encoded, and the transform coefficients of the set number of codes are set to be: the non-zero transform coefficient distribution of the transform coefficient of the coded number is set, and the number of codes is set.
- the transform coefficient of the transform coefficient is greater than one, and the transform coefficient of the set number of transform coefficients is greater than the absolute value of one, and the sign of the non-zero transform coefficient of the set number of transform coefficients is encoded.
- the above stored location can be a cache.
- the above-mentioned set number of transform coefficients can be determined according to the size of the performance buffer of the processor, etc., and it is experimentally found that the above-mentioned set number is 16 to obtain better coding efficiency.
- the preset scanning sequence is a scanning order of a large scanning mode or a scanning sequence of a small scanning mode.
- the embodiment of the present invention gives an example in the subsequent embodiments. It is to be understood that the preset scanning sequence may be other, as long as the encoding end is associated with the decoding end, which is not limited in this embodiment of the present invention.
- the scanning sequence of the encoding significance map is the same as the scanning sequence of the encoding level and the process of encoding the sign.
- the encoding process only needs to read the data once, and the decoding end only needs a sequential check.
- the table mode in addition, splits the significance map into smaller significance maps, thereby reducing the codec overhead and improving the codec efficiency.
- a transform coefficient decoding method includes:
- the preset scanning order is the same as the scanning order preset by the encoding end.
- the protocol may be used, and the negotiation may be used.
- the preset scanning sequence may be a scan order of a large scan mode or a scan order of a small scan mode, and then the transform coefficients of the code stream are parsed according to a preset scan order to obtain a distribution of non-zero transform coefficients;
- the scan order analyzes the distribution of the transform coefficients of the code stream greater than 1, the absolute value of the transform coefficient greater than 1, and the sign of the non-zero transform coefficient, and the transform coefficients of the set number of parsing the code stream each time include:
- the scanning sequence of the encoding significance map is the same as the scanning sequence of the encoding level and the process of encoding the sign.
- the encoding process only needs to read the data once, and the decoding end only needs a sequential check.
- the table mode in addition, splits the significance map into smaller significance maps, thereby reducing the codec overhead and improving the encoding and decoding efficiency.
- an 8x8 transform coefficient block is used, and the number of transform coefficients per scan or parsing is 16 as an example.
- Example 1 Assume that the preset scanning order is a sweep mode. If the preset scan order is a zig-zag method, refer to FIG. 1A.
- the encoding side executes in order:
- the decoding end executes in order:
- the coding of the transform coefficients includes: a distribution of transform coefficients and a value of the transform coefficients, wherein the values of the transform coefficients include: an absolute value of the transform coefficients and a sign of the transform coefficients, and the absolute values of the transform coefficients include: a distribution of transform coefficients having a value greater than one ( Through this, it is actually known which absolute values of the non-zero transform coefficients are 1) and the absolute values of the transform coefficients whose values are greater than 1.
- Example 2 It is assumed that the preset scanning order is a small scanning mode. If the preset scanning order is a small z-shaped (zig-zag) method, refer to Figure IB.
- the encoding side executes in order:
- the significance map information contains the end of the map), encodes a map with coefficients greater than 1, then encodes an absolute value greater than 1, then encodes the sign of the non-zero coeffcients, buffers the level, sign information, and the resulting 16 coefficients.
- the level, sign is programmed into the stream.
- the decoding end executes in order:
- a transform coefficient encoding device as shown in FIG. 4, includes:
- a coding unit 401 configured to encode transform coefficients of the transform coefficient block according to a preset scan order, and set each set of transform coefficients to be encoded until the last set of the transform coefficient blocks is encoded;
- a set of codes is obtained, after obtaining the distribution of the non-zero transform coefficients of the last set of codes, The stored non-zero transform coefficient distribution and the last set of encoded non-zero transform coefficient distributions are encoded into the code stream, and the absolute values of the last set of encoded transform coefficients and the sign of the non-zero transform coefficients are obtained, and the stored The absolute value of the transform coefficient and the sign of the non-zero transform coefficient and the absolute value of the last set of encoded transform coefficients and the sign of the non-zero transform coefficient are encoded into the code stream;
- the storage unit 402 is configured to store a non-zero transform coefficient distribution obtained by the coding unit, an absolute value of the transform coefficient, and a sign of the non-zero transform coefficient.
- the foregoing coding unit 401 is configured to encode the transform coefficients of the transform coefficient block according to a preset scan order, including:
- the transform coefficients of the above-described transform coefficient block are encoded in accordance with a scan order of a small scan mode.
- the scanning sequence of the encoding significance map is the same as the scanning sequence of the encoding level and the process of encoding the sign.
- the encoding process only needs to read the data once, and the decoding end only needs a sequential check.
- the table mode in addition, splits the significance map into smaller significance maps, thereby reducing the codec overhead and improving the encoding and decoding efficiency.
- a transform coefficient decoding device as shown in FIG. 5, includes:
- the decoding unit 501 is configured to parse the transform coefficients of the code stream according to a preset scan order to obtain a distribution of non-zero transform coefficients; and parse the transform coefficient of the code stream with a transform coefficient greater than 1 according to a preset scan order, and the transform coefficient is greater than 1.
- the absolute value, the sign of the non-zero transform coefficient, and the above-described set number of transform coefficients of the above code stream are analyzed each time.
- the decoding unit 501 is specifically configured to: parse the code stream in a scan order of a large scan mode to obtain a distribution of non-zero transform coefficients; and analyze, in a scan order of a large scan mode, a transform coefficient of the code stream that is greater than one, The transform coefficient is greater than 1, an absolute value of the non-zero transform coefficient, and the transform coefficient of the set number of the code stream is parsed each time; or the decoding unit 501 is specifically configured to: scan order in a small scan manner Parsing the code stream to obtain a distribution of non-zero transform coefficients, and parsing a set number of transform coefficients of the code stream each time;
- the scanning sequence of the coding significance map, and the coding The process of the process of signing the sign of leveK is the same.
- the encoding process only needs to read the data once.
- the decoding end only needs a sequential look-up table.
- the significance map is split into smaller significance maps. Reduce codec overhead and improve codec efficiency.
- Video encoders, decoders are widely used in a variety of communication devices or electronic devices, such as: digital TV, set-top box, media gateway, mobile phone, wireless device, personal data assistant (PDA), handheld or portable computer, GPS receiver / navigator, camera, video player, camcorder, video recorder, surveillance equipment, video conferencing and video telephony equipment, etc.
- PDA personal data assistant
- Such devices include processors, memory, and interfaces for transmitting data.
- the video codec can be implemented directly by a digital circuit or chip such as a DSP (digital signal processor) or by a software code that drives a processor to execute the flow in the software code.
- DSP digital signal processor
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Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
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CA2829494A CA2829494C (en) | 2011-03-10 | 2011-11-22 | Method and apparatus for encoding and decoding transform coefficients |
JP2013556948A JP5881747B2 (ja) | 2011-03-10 | 2011-11-22 | 変換係数の符号化及び復号方法及び装置 |
EP16196991.0A EP3211897B1 (en) | 2011-03-10 | 2011-11-22 | Method and apparatus for encoding and decoding transform coefficients |
KR1020137025250A KR101654123B1 (ko) | 2011-03-10 | 2011-11-22 | 변환 계수 인코딩 및 디코딩 방법 및 장치 |
AU2011361374A AU2011361374B2 (en) | 2011-03-10 | 2011-11-22 | Method and apparatus for encoding and decoding transform coefficients |
RU2013145307/08A RU2565505C2 (ru) | 2011-03-10 | 2011-11-22 | Способ и устройство для кодирования и декодирования коэффициентов преобразования |
PL16196991T PL3211897T3 (pl) | 2011-03-10 | 2011-11-22 | Sposób i urządzenie do kodowania i dekodowania współczynników transformaty |
KR1020167023745A KR101688452B1 (ko) | 2011-03-10 | 2011-11-22 | 변환 계수 인코딩 및 디코딩 방법 및 장치 |
ES11860213.5T ES2623202T3 (es) | 2011-03-10 | 2011-11-22 | Procedimiento de codificación, procedimiento de descodificación y equipos para coeficientes de transformada |
EP11860213.5A EP2677750B1 (en) | 2011-03-10 | 2011-11-22 | Coding method, decoding method, and equipments for transform coefficients |
BR112013023141A BR112013023141B8 (pt) | 2011-03-10 | 2011-11-22 | método e aparelho para codificação e decodificação de coeficientes de transformada |
US14/021,782 US9571836B2 (en) | 2011-03-10 | 2013-09-09 | Method and apparatus for encoding and decoding with multiple transform coefficients sub-blocks |
AU2015210374A AU2015210374B2 (en) | 2011-03-10 | 2015-08-05 | Method and apparatus for encoding and decoding transform coefficients |
US15/391,810 US10165305B2 (en) | 2011-03-10 | 2016-12-27 | Encoding and decoding transform coefficient sub-blocks in same predetermine order |
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CN201110057694.9A CN102685503B (zh) | 2011-03-10 | 2011-03-10 | 变换系数的编码方法、变换系数的解码方法,和装置 |
CN201110057694.9 | 2011-03-10 |
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US14/021,782 Continuation US9571836B2 (en) | 2011-03-10 | 2013-09-09 | Method and apparatus for encoding and decoding with multiple transform coefficients sub-blocks |
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US (2) | US9571836B2 (zh) |
EP (2) | EP3211897B1 (zh) |
JP (1) | JP5881747B2 (zh) |
KR (2) | KR101654123B1 (zh) |
CN (1) | CN102685503B (zh) |
AU (2) | AU2011361374B2 (zh) |
BR (1) | BR112013023141B8 (zh) |
CA (1) | CA2829494C (zh) |
DK (1) | DK3211897T3 (zh) |
ES (2) | ES2732009T3 (zh) |
HU (1) | HUE043337T2 (zh) |
PL (1) | PL3211897T3 (zh) |
PT (1) | PT3211897T (zh) |
RU (2) | RU2565505C2 (zh) |
SI (1) | SI3211897T1 (zh) |
TR (1) | TR201907869T4 (zh) |
WO (1) | WO2012119463A1 (zh) |
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