WO2021136607A1 - Saut de transformée en codage et décodage vidéo - Google Patents

Saut de transformée en codage et décodage vidéo Download PDF

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Publication number
WO2021136607A1
WO2021136607A1 PCT/EP2020/078470 EP2020078470W WO2021136607A1 WO 2021136607 A1 WO2021136607 A1 WO 2021136607A1 EP 2020078470 W EP2020078470 W EP 2020078470W WO 2021136607 A1 WO2021136607 A1 WO 2021136607A1
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WIPO (PCT)
Prior art keywords
prediction
sample filtering
intra
reference sample
transform
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PCT/EP2020/078470
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English (en)
Inventor
Saverio BLASI
Gosala KULUPANA
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British Broadcasting Corporation
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Publication date
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Publication of WO2021136607A1 publication Critical patent/WO2021136607A1/fr

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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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • 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
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • 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
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
    • 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
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop

Definitions

  • the present disclosure relates to video coding and decoding.
  • Digital video can be encoded for transport and/or storage. This can have efficiency advantage, in terms of demand for channel bandwidth, storage requirements, and error detection and/or correction.
  • Video compression techniques involve taking blocks of video data, and employing a variety of approaches to take advantage of redundancy.
  • intra-prediction is a spatial approach, which involves encoding a video block with reference to another (predictive) video block in the same frame of video data.
  • inter prediction is a temporal approach, involving encoding a video block of a video frame with reference to a corresponding (predictive) block of another frame of the video data.
  • residual data with reference to the predictive block.
  • residuals can be further encoded, such as by transformation from the pixel domain to a transform domain. This results in residual transform coefficients which can be then be quantised for further encoding, such as by entropy encoding, to produce a highly compressed data set.
  • Figure 1 is a schematic representation of a communications network in accordance with an embodiment
  • Figure 2 is a schematic representation of an emitter of the communications network of figure 1 ;
  • Figure 3 is a diagram illustrating an encoder implemented on the emitter of figure 2;
  • Figure 4 is a flow diagram of a prediction process performed at a prediction module of the encoder of figure 3;
  • Figure 5 is a schematic representation of a receiver of the communications network of figure 1 ;
  • Figure 6 is a diagram illustrating a decoder implemented on the receiver of figure 4.
  • Figure 7 is a flow diagram of a prediction process performed at a prediction module of the decoder of figure 6.
  • VVC Versatile Video Coding
  • JVET Joint Video Experts Team
  • ISO/I EC JTC 1 a united video expert team of the MPEG working group of ISO/I EC JTC 1 and the VCEG working group of ITU-T.
  • residual signals of intra predicted blocks can be compressed using different techniques.
  • Such techniques can be categorized in three main options:
  • DCT discrete cosine transformation
  • RRC Regular Residual Coding
  • Category 3 Skip the DCT based transform operations (i.e., use Transform Skip) on residual blocks, followed by quantisation, apply BDPCM (Block-DPCM) prediction on quantized residuals, and finally apply Transform Skip Residual Coding (TSRC) While the above categories refer to ways to compress the residuals that are obtained by subtracting a prediction from an original block, from the perspective of the VVC draft standard specifications, the usage of each of the three above categories has a direct effect on the way the prediction itself is computed. In other words, at the decoder side, if it is detected that one of the above three categories is to be used to decompress the coefficients into residuals, then, this consequently implies that the prediction step happens in different ways.
  • TSRC Transform Skip Residual Coding
  • the appropriate category can be inferred based on whether or not the corresponding residual block is Transform skipped, and the BDPCM type.
  • a block is BDPCM coded, its transform type is inferred to be Transform skip whereas for non-BDPCM blocks, a separate flag is signalled to indicate whether the block is transform skipped or not.
  • a technique called reference sample filtering can be applied to the reference samples prior to performing the intra-prediction operation.
  • the filtering may be applied, or not, as the case may be, depending on whether the block belongs to one of the three categories above.
  • PDPC Position Dependent Prediction Combination
  • category 2 and 3 blocks are effectively handled the same way.
  • This has an advantage in terms of simplifying the implementation of an encoder and a decoder, in that two categories of blocks are effectively treated the same way. This can also bring coding efficiency gains.
  • variable refFilterFlag is derived as follows: If predModelntra is equal to one of the following values: 0, -14, -12, -10, -6, 2, 34, 66, 12, 16, 18, 80, then refFilterFlag is set equal to 1.
  • refFilterFlag is set equal to 0.
  • nTbW is greater than or equal to 4 and nTbH is greater than or equal to 4 or cldx is not equal to 0
  • - refldx is equal to 0 or cldx is not equal to 0
  • the above arrangement can be implemented in video communication network, designed to process a video presentation by encoding techniques, enabling it to be transmitted (or stored) for decoding by a playback device.
  • an aspect of the present disclosure enables the signalling of transform skip in a bitstream, in respect of which a decoder is configured, on the basis that transform skip is enabled, to suppress reference sample filtering and/or PDPC. If transform skip is disabled, then the decoder is able to invoke RSF and PDPC as required.
  • FIG 1 an arrangement is illustrated comprising a schematic video communication network 10, in which an emitter 20 and a receiver 30 are in communication via a communications channel 40.
  • the communications channel 40 may comprise a satellite communications channel, a cable network, a ground-based radio broadcast network, a POTS-implemented communications channel, such as used for provision of internet services to domestic and small business premises, fibre optic communications systems, or a combination of any of the above and any other conceivable communications medium.
  • the disclosure also extends to communication, by physical transfer, of a storage medium on which is stored a machine readable record of an encoded bitstream, for passage to a suitably configured receiver capable of reading the medium and obtaining the bitstream therefrom.
  • a suitably configured receiver capable of reading the medium and obtaining the bitstream therefrom.
  • DVD digital versatile disk
  • the following description focuses on signal transmission, such as by electronic or electromagnetic signal carrier, but should not be read as excluding the aforementioned approach involving storage media.
  • the emitter 20 is a computer apparatus, in structure and function. It may share, with general purpose computer apparatus, certain features, but some features may be implementation specific, given the specialised function for which the emitter 20 is to be put. The reader will understand which features can be of general purpose type, and which may be required to be configured specifically for use in a video emitter.
  • the emitter 20 thus comprises a graphics processing unit (GPU) 202 configured for specific use in processing graphics and similar operations.
  • the emitter 20 also comprises one or more other processors 204, either generally provisioned, or configured for other purposes such as mathematical operations, audio processing, managing a communications channel, and so on.
  • An input interface 206 provides a facility for receipt of user input actions. Such user input actions could, for instance, be caused by user interaction with a specific input unit including one or more control buttons and/or switches, a keyboard, a mouse or other pointing device, a speech recognition unit enabled to receive and process speech into control commands, a signal processor configured to receive and control processes from another device such as a tablet or smartphone, or a remote-control receiver.
  • a specific input unit including one or more control buttons and/or switches, a keyboard, a mouse or other pointing device, a speech recognition unit enabled to receive and process speech into control commands, a signal processor configured to receive and control processes from another device such as a tablet or smartphone, or a remote-control receiver.
  • an output interface 214 is operable to provide a facility for output of signals to a user or another device. Such output could include a display signal for driving a local video display unit (VDU) or any other device.
  • VDU local video display unit
  • a communications interface 208 implements a communications channel, whether broadcast or end-to-end, with one or more recipients of signals.
  • the communications interface is configured to cause emission of a signal bearing a bitstream defining a video signal, encoded by the emitter 20.
  • the processors 204 and specifically for the benefit of the present disclosure, the GPU 202, are operable to execute computer programs, in operation of the encoder. In doing this, recourse is made to data storage facilities provided by a mass storage device 208 which is implemented to provide large-scale data storage albeit on a relatively slow access basis, and will store, in practice, computer programs and, in the current context, video presentation data, in preparation for execution of an encoding process.
  • a Read Only Memory (ROM) 210 is preconfigured with executable programs designed to provide the core of the functionality of the emitter 20, and a Random Access Memory 212 is provided for rapid access and storage of data and program instructions in the pursuit of execution of a computer program.
  • ROM Read Only Memory
  • Figure 3 shows a processing pipeline performed by an encoder implemented on the emitter 20 by means of executable instructions, on a data file representing a video presentation comprising a plurality of frames for sequential display as a sequence of pictures.
  • the data file may also comprise audio playback information, to accompany the video presentation, and further supplementary information such as electronic programme guide information, subtitling, or metadata to enable cataloguing of the presentation.
  • the processing of these aspects of the data file are not relevant to the present disclosure.
  • the current picture or frame in a sequence of pictures is passed to a partitioning module 230 where it is partitioned into rectangular blocks of a given size for processing by the encoder. This processing may be sequential or parallel. The approach may depend on the processing capabilities of the specific implementation.
  • Each block is then input to a prediction module 232, which seeks to discard temporal and spatial redundancies present in the sequence and obtain a prediction signal using previously coded content.
  • Information enabling computation of such a prediction is encoded in the bitstream. This information should comprise sufficient information to enable computation, including the possibility of inference at the receiver of other information necessary to complete the prediction.
  • the prediction signal is subtracted from the original signal to obtain a residual signal.
  • This is then input to a transform module 234, which attempts to further reduce spatial redundancies within a block by using a more suitable representation of the data.
  • transform skip may instead be implemented. Employment of transform skip, may be signalled in the bitstream.
  • the resulting signal is then typically quantised by quantisation module 236, and finally the resulting data formed of the coefficients and the information necessary to compute the prediction for the current block is input to an entropy coding module 238 makes use of statistical redundancy to represent the signal in a compact form by means of short binary codes.
  • transform skip residual coding TSRC
  • bitstream of block information elements can be constructed for transmission to a receiver or a plurality of receivers, as the case may be.
  • the bitstream may also bear information elements which apply across a plurality of block information elements and are thus held in bitstream syntax independent of block information elements. Examples of such information elements include configuration options, parameters applicable to a sequence of frames, and parameters relating to the video presentation as a whole.
  • the prediction module 232 will now be described in further detail, with reference to figure 4. As will be understood, this is but an example, and other approaches, within the scope of the present disclosure and the appended claims, could be contemplated.
  • the prediction module 232 is configured to determine, for a given block of luma or chroma samples partitioned from a frame, whether intra-prediction is to be employed and, if so, which of a plurality of predetermined intra-prediction modes is to be used. The prediction module then applies the selected mode of intra-prediction, if applicable, and then determines a prediction, on the basis of which residuals can then be generated as previously noted.
  • the prediction employed is signalled in the bitstream, for receipt and interpretation by a suitably configured decoder. The encoder will signal on the bitstream information to enable a decoder to determine which mode has been used
  • the encoder avails itself of information from prior predictions, in constructing a prediction for a present block.
  • the encoder may combine the knowledge from inter-prediction, i.e. from a prior frame, and intra-prediction, i.e. from another block in the same frame.
  • the present embodiment is concerned with the way of computing the intra-prediction dependant on whether or not the corresponding residual block is Transform skipped.
  • step S102 This is done by determining (step S102) which of three approaches are to be taken to the intra-prediction process and the subsequent transform process.
  • the appropriate category is inferred based on whether or not the corresponding residual block is Transform skipped, and the BDPCM type.
  • a block is BDPCM coded, its transform type is inferred to be Transform skip. Otherwise, for other non-BDPCM blocks, a separate flag may be signalled to indicate whether the block is transform skipped or not.
  • category 1 intra-prediction involves application of reference sample filtering (RSF) (step S104) as appropriate. Categories 2 and 3, which implicate transform skip, do not involve these two steps. Then the intra-prediction operation is applied (step S106) followed by application of PDPC (step S108).
  • the PDPC may only be applied for category 1 prediction blocks whereas for categories 2 and 3, no PDPC operation is applied. In essence, this implies that intra-prediction in Transform skipped residual blocks are done without reference sample filtering and/or without invoking PDPC operations.
  • the structural architecture of the receiver is illustrated in figure 5. It has the elements of being a computer implemented apparatus.
  • the receiver 30 thus comprises a graphics processing unit 302 configured for specific use in processing graphics and similar operations.
  • the receiver 30 also comprises one or more other processors 304, either generally provisioned, or configured for other purposes such as mathematical operations, audio processing, managing a communications channel, and so on.
  • the receiver 30 may be implemented in the form of a set top box, a hand held personal electronic device, a personal computer, or any other device suitable for the playback of video presentations.
  • An input interface 306 provides a facility for receipt of user input actions. Such user input actions could, for instance, be caused by user interaction with a specific input unit including one or more control buttons and/or switches, a keyboard, a mouse or other pointing device, a speech recognition unit enabled to receive and process speech into control commands, a signal processor configured to receive and control processes from another device such as a tablet or smartphone, or a remote-control receiver.
  • a specific input unit including one or more control buttons and/or switches, a keyboard, a mouse or other pointing device, a speech recognition unit enabled to receive and process speech into control commands, a signal processor configured to receive and control processes from another device such as a tablet or smartphone, or a remote-control receiver.
  • an output interface 314 is operable to provide a facility for output of signals to a user or another device. Such output could include a television signal, in suitable format, for driving a local television device.
  • a communications interface 308 implements a communications channel, whether broadcast or end-to-end, with one or more recipients of signals.
  • the communications interface is configured to cause emission of a signal bearing a bitstream defining a video signal, encoded by the receiver 30.
  • the processors 304 and specifically for the benefit of the present disclosure, the GPU 302, are operable to execute computer programs, in operation of the receiver. In doing this, recourse is made to data storage facilities provided by a mass storage device 308 which is implemented to provide large-scale data storage albeit on a relatively slow access basis, and will store, in practice, computer programs and, in the current context, video presentation data, resulting from execution of an receiving process.
  • a Read Only Memory (ROM) 310 is preconfigured with executable programs designed to provide the core of the functionality of the receiver 30, and a Random Access Memory 312 is provided for rapid access and storage of data and program instructions in the pursuit of execution of a computer program.
  • Figure 6 shows a processing pipeline performed by a decoder implemented on the receiver 20 by means of executable instructions, on a bitstream received at the receiver 30 comprising structured information from which a video presentation can be derived, comprising a reconstruction of the frames encoded by the encoder functionality of the emitter 20.
  • the decoding process illustrated in figure 6 aims to reverse the process performed at the encoder. The reader will appreciate that this does not imply that the decoding process is an exact inverse of the encoding process.
  • a received bit stream comprises a succession of encoded information elements, each element being related to a block.
  • a block information element is decoded in an entropy decoding module 330 to obtain a block of coefficients and the information necessary to compute the prediction for the current block.
  • the block of coefficients is typically de- quantised in dequantisation module 332 and typically inverse transformed to the spatial domain by transform module 334, unless transform skip is signalled to the decoder.
  • a prediction signal is generated as before, from previously decoded samples from current or previous frames and using the information decoded from the bit stream, by prediction module 336.
  • a reconstruction of the original picture block is then derived from the decoded residual signal and the calculated prediction block in the reconstruction block 338.
  • the prediction module 336 is responsive to information, on the bitstream, signalling the use of intra-prediction and, if such information is present, reading from the bitstream information which enables the decoder to determine which intra-prediction mode has been employed and thus which prediction technique should be employed in reconstruction of a block information sample.
  • intra-prediction is established by virtue of identification of the block as one of three categories.
  • picture blocks can be reconstructed into frames which can then be assembled to produce a video presentation for playback.
  • the decoder functionality of the receiver 30 extracts from the bitstream a succession of block information elements, as encoded by the encoder facility of the emitter 20, defining block information and accompanying configuration information.
  • the decoder avails itself of information from prior predictions, in constructing a prediction for a present block.
  • the decoder may combine the knowledge from inter-prediction, i.e. from a prior frame, and intra-prediction, i.e. from another block in the same frame.
  • the present embodiment is concerned with the way of computing the intra-prediction dependant on whether or not the corresponding residual block is Transform skipped.
  • step S202 This is done by determining (step S202) which of three approaches are to be taken to the intra-prediction process and the implied transform process.
  • the appropriate category is inferred based on whether or not the corresponding residual block is Transform skipped, and the BDPCM type.
  • a block is BDPCM coded, its transform type is inferred to be Transform skip. Otherwise, for other non-BDPCM blocks, a separate flag is signalled to indicate whether the block is transform skipped or not.
  • category 1 intra-prediction involves application of reference sample filtering (RSF) (step S204) as appropriate. Categories 2 and 3, which implicate transform skip, do not involve this step.
  • RSF reference sample filtering

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Abstract

La saut de transformée est signalé dans un flux binaire et un décodeur est configuré, sur la base de la capacité de transformée, pour supprimer le filtrage d'échantillon de référence (RSF) et la PDPC. Si le saut de transformée est désactivé, alors le décodeur peut appeler le RSF et la PDPC selon les besoins.
PCT/EP2020/078470 2020-01-03 2020-10-09 Saut de transformée en codage et décodage vidéo WO2021136607A1 (fr)

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GB2000066.7A GB2590729A (en) 2020-01-03 2020-01-03 Transform skip in video coding and decoding
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WO2021172910A1 (fr) * 2020-02-25 2021-09-02 엘지전자 주식회사 Procédé de décodage d'image lié à un codage résiduel, et dispositif associé

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WO2015010037A1 (fr) * 2013-07-19 2015-01-22 Qualcomm Incorporated Désactivation du filtrage de prédiction intra-trame
WO2018165397A1 (fr) * 2017-03-10 2018-09-13 Qualcomm Incorporated Drapeau d'intra-filtrage dans un codage vidéo

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WO2015010037A1 (fr) * 2013-07-19 2015-01-22 Qualcomm Incorporated Désactivation du filtrage de prédiction intra-trame
WO2018165397A1 (fr) * 2017-03-10 2018-09-13 Qualcomm Incorporated Drapeau d'intra-filtrage dans un codage vidéo

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BLASI S ET AL: "Aligning intra-prediction of TS blocks with BDPCM", no. JVET-Q0556, 11 January 2020 (2020-01-11), XP030223879, Retrieved from the Internet <URL:http://phenix.int-evry.fr/jvet/doc_end_user/documents/17_Brussels/wg11/JVET-Q0556-v4.zip JVET-Q0556-Aligning intra-prediction of TS blocks with BDPCM/JVET-Q0556-Aligning intra-prediction of TS blocks with BDPCM.docx> [retrieved on 20200111] *
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