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WO2013056577A1 - Encodeur et décodeur de mode de prédiction de trames intra, procédé correspondant et dispositif électronique associé - Google Patents

Encodeur et décodeur de mode de prédiction de trames intra, procédé correspondant et dispositif électronique associé Download PDF

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Publication number
WO2013056577A1
WO2013056577A1 PCT/CN2012/078620 CN2012078620W WO2013056577A1 WO 2013056577 A1 WO2013056577 A1 WO 2013056577A1 CN 2012078620 W CN2012078620 W CN 2012078620W WO 2013056577 A1 WO2013056577 A1 WO 2013056577A1
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intra prediction
prediction mode
reference pixel
current block
mode
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English (en)
Chinese (zh)
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宋秀娟
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ZTE Corp
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ZTE Corp
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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
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H04N19/463—Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission
    • 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

Definitions

  • Intra prediction mode encoder decoder, method and electronic device thereof
  • the present invention relates to the field of video communication technologies, and in particular, to an intra prediction mode encoder, a decoder, a method thereof, and an electronic device.
  • H.264/AVC International Telecommunication Union Telecommunication Standards
  • ITU-T International Telecommunication Union Telecommunication Standards
  • ISO/IEC International Organization for Standardization/International Electrotechnical Commission
  • H.264/AVC was developed in cooperation with these two standardization organizations. The purpose is to adapt to the ever-increasing demands of various business services for the compression ratio of moving images, and to enable the encoded video data to be used in various network environments. transmission.
  • the intra prediction technique used by H.264/AVC can effectively improve the intra prediction coding efficiency.
  • 16x16 blocks use 4 intra prediction modes
  • 8x8 blocks and 4x4 blocks use 9 intra prediction modes.
  • the four intra prediction modes of the 16x16 block use 2 bits for the equal length coding.
  • the intra prediction direction coding of 8x8 blocks and 4x4 blocks uses the following method:
  • Step 1 Obtain the most probable prediction mode (MPM) of the current block according to the intra prediction direction of the neighboring block.
  • MPM most probable prediction mode
  • Step 2 If the current block uses the same intra prediction mode as the MPM, use the 1 bit flag to identify "the current block uses the intra prediction mode of the MPM" and the encoding process ends; otherwise, skip to step 3.
  • Step 3 Encode a 1-bit flag that identifies "the current block does not use MPM's intra prediction mode".
  • Step 4 Remove the MPM from the intra prediction mode list, then sort the remaining intra prediction modes and assign equal length code words to each mode, and correspond to the currently used intra prediction mode.
  • the code word is written to the code stream and the encoding process ends.
  • intra prediction calculates an intra prediction value of each pixel point in a current block using a restored value of a coded pixel point in a neighboring block. If some of the reference pixels in the neighboring block are not available, some of the corresponding intra prediction modes will inevitably not be used. For example, if adjacent pixels on a boundary are not available, the intra prediction mode using adjacent pixels on the boundary will not be used.
  • a mapping code table is generated for all intra prediction modes except for all or MPM, and is encoded, which results in a large coding overhead.
  • the technical problem to be solved by the embodiments of the present invention is to provide an intra prediction mode encoder, a decoder, a method thereof, and an electronic device, which remove a prediction mode that is inevitably unavailable according to the availability of reference pixels of neighboring blocks, thereby reducing intra prediction.
  • Mode encoding overhead is to provide an intra prediction mode encoder, a decoder, a method thereof, and an electronic device, which remove a prediction mode that is inevitably unavailable according to the availability of reference pixels of neighboring blocks, thereby reducing intra prediction.
  • An intra prediction mode coding method comprising:
  • the intra prediction mode that the current block is inevitably used in the encoding process is removed from all the intra prediction modes, and the available intra prediction mode is obtained;
  • the intra prediction mode of the current block is encoded according to the generated mapping code table.
  • the intra prediction mode that the current block is inevitably not used in the encoding process is removed from all the intra prediction modes, and the available intra prediction is obtained.
  • the steps of the pattern include:
  • the neighboring block uses the restricted intra prediction mode
  • the block in which the intra prediction reference pixel is located uses a non-intra prediction mode, or the intra prediction reference pixel is not in the same slice as the current block, Or if the intra prediction reference pixel does not exist, it is determined that the intra prediction reference pixel is not available; when the neighboring block does not use the restricted intra prediction mode, if the intra prediction reference pixel is not the same as the current block If the slice or the intra prediction reference pixel does not exist, then the intra prediction parameter is determined. The test pixel is not available.
  • the case where the intra prediction reference pixel does not exist includes: the current block is located at an image boundary.
  • An intra prediction mode decoding method comprising:
  • the intra prediction mode that the current block is inevitably used in the encoding process is removed from all the intra prediction modes, and the available intra prediction mode is obtained;
  • the current block is decoded according to the determined intra prediction mode.
  • the intra prediction mode that the current block is inevitably not used in the encoding process is removed from all the intra prediction modes, and the available intra prediction is obtained.
  • the steps of the pattern include:
  • the neighboring block uses the restricted intra prediction mode
  • the block in which the intra prediction reference pixel is located uses a non-intra prediction mode, or the intra prediction reference pixel is not in the same slice as the current block, Or if the intra prediction reference pixel does not exist, it is determined that the intra prediction reference pixel is not available; when the neighboring block does not use the restricted intra prediction mode, if the intra prediction reference pixel is not the same as the current block If the slice, or the intra prediction reference pixel does not exist, it is determined that the intra prediction reference pixel is not available.
  • An encoder the encoder includes a determining module, a generating module, and an encoding module, where: the determining module is configured to: determine, according to the availability of an intra-predicted reference pixel in a neighboring block, that the current block encoding process is inevitably Intra prediction mode used;
  • the generating module is configured to: according to the current block encoding process determined by the determining module However, the intra prediction mode that is not used removes the intra prediction mode that the current block must not use during the encoding process from all intra prediction modes, obtains an available intra prediction mode, and assigns an index number to the available intra prediction mode, and Generating a mapping code table between the index number and the codeword;
  • the encoding module is configured to: encode the current block intra prediction mode according to the mapping code table generated by the generating module.
  • the determining module is configured to determine an intra prediction mode that is inevitably not used in the current block coding process according to the availability of the intra prediction reference pixel in the neighboring block in the following manner:
  • the neighboring block uses the restricted intra prediction mode
  • the block in which the intra prediction reference pixel is located uses the non-intra prediction mode, or the intra prediction reference pixel is not in the same slice or frame as the current block, Determining that the reference pixel is not present, determining that the intra prediction reference pixel is not available;
  • the intra prediction reference pixel is determined. The point is not available.
  • a decoder comprising a determining unit, a generating unit, a first decoding unit and a second decoding unit, wherein: the determining unit is configured to: determine according to availability of intra prediction reference pixel points in neighboring blocks An intra prediction mode that is inevitably not used in the current block encoding process;
  • the generating unit is configured to: remove, according to the intra prediction mode that is not used in the current block coding process determined by the determining module, the intra prediction that the current block is inevitably not used in the encoding process from all the intra prediction modes. a mode, obtaining an available intra prediction mode, assigning an index number to an available intra prediction mode, and generating a mapping code table between the index number and the code word;
  • the first decoding unit is configured to: convert the input codeword into an intra prediction mode index sequence according to the mapping code table generated by the generating unit, and determine an intra prediction mode used by the current block; the second decoding unit Set to: decode the current block according to the determined intra prediction mode.
  • the determining unit is configured to determine an intra prediction mode that is inevitably not used in the current block coding process according to the availability of the intra prediction reference pixel in the neighboring block in the following manner:
  • the neighboring block uses the restricted intra prediction mode, if the block in which the intra prediction reference pixel is located uses the non-intra prediction mode, or the intra prediction reference pixel is not in the same slice or frame as the current block, Determining that the reference pixel is not present, determining that the intra prediction reference pixel is not available;
  • the intra prediction reference pixel is determined. The point is not available.
  • An electronic device comprising: any of the encoders described above, and/or any of the decoders described above.
  • the intra prediction mode that is inevitably unavailable is removed from all intra prediction modes, the prediction mode index table is cropped, and the prediction mode index sequence number is adjusted.
  • the prediction mode index number is encoded by using the unequal length code, thereby reducing the intra prediction mode coding overhead.
  • FIG. 1 is a schematic flowchart of an intra prediction mode encoding method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of an intra prediction mode decoding method according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of an intra prediction mode of a 16x16 block
  • Figure 4 is a schematic diagram of the intra prediction modes of 8x8 blocks and 4x4 blocks. Preferred embodiment of the invention
  • the present embodiment provides an intra prediction mode coding method, which uses the following technical solution: According to the availability of intra prediction reference pixel points in neighboring blocks of the current block, all intra prediction is performed. In the mode, the intra prediction mode that the current block is inevitably not used in the encoding process is removed, and the available intra prediction mode is obtained;
  • the current block intra prediction mode is encoded according to the generated mapping code table.
  • the neighboring block uses a restricted intra prediction mode (refer to an encoding mode of a reference block where an intra prediction reference pixel is located must be a specified frame) Intra prediction mode) (PPS::constrained_intra_pred_flag value is 1), if the block in which the intra prediction reference pixel is located uses a non-intra prediction mode (such as inter prediction mode, etc.), or an intra prediction reference pixel Determining that the intra prediction reference pixel is not available, if the current block is not in the same slice, or the intra prediction reference pixel does not exist (as in the case where the current block is located at the image boundary);
  • the neighboring block does not use the restricted intra prediction mode (PPS::constrained_intra_pred_flag value is 0)
  • PPS::constrained_intra_pred_flag value 0
  • the intra prediction reference pixel is not in the same slice as the current block, or the intra prediction reference If the pixel does not exist (as in the case where the current block is located at the edge of the image), it is determined that the intra-predicted reference pixel is not available.
  • the embodiment further provides an intra prediction mode decoding method, which uses the following technical solutions:
  • the intra prediction mode that the current block is inevitably used in the encoding process is removed from all the intra prediction modes, and the available intra prediction mode is obtained;
  • the current block is decoded according to the determined intra prediction mode.
  • the intra prediction mode coding method in this embodiment mainly includes the following steps: Step 1: Determine the availability of intra prediction reference pixel points in adjacent blocks;
  • Step 2 removing an intra prediction mode that is inevitably not used according to the availability of the intra prediction reference pixel
  • the intra prediction mode that is inevitably not used in the encoding process can be obtained according to the relevant standard protocol.
  • Step 3 assign an index sequence number to the available intra prediction mode, and generate a mapping code table between the index sequence number and the codeword;
  • Step 4 encode the current block intra prediction mode according to the generated mapping code table.
  • the intra prediction mode decoding method in this embodiment mainly includes the following steps: Step 1: Determine the availability of an intra prediction reference pixel in a neighboring block;
  • Step 2 removing an intra prediction mode that is inevitably not used according to the availability of the intra prediction reference pixel
  • Step 3 assign an index sequence number to the available intra prediction mode, and generate a mapping code table between the index sequence number and the codeword;
  • Step 4 Convert the input codeword into an intra prediction mode index number according to the generated mapping code table, and determine an intra prediction mode used by the current block.
  • Step 5 Decode the current block according to the determined intra prediction mode.
  • the embodiment provides an encoder, where the encoder includes: a determining module, a generating module, and an encoding module, where The determining module is configured to: determine, according to availability of intra prediction reference pixel points in the neighboring block, an intra prediction mode that is inevitably not used in the current block encoding process;
  • the generating module is configured to: remove, according to the intra prediction mode that is not used in the current block coding process determined by the determining module, from all the intra prediction modes, remove the intra prediction that the current block is inevitably not used in the encoding process.
  • Mode obtaining an available intra prediction mode, assigning an index number to an available intra prediction mode, and generating a mapping code table between the index number and the code word;
  • the encoding module is configured to: encode the current block intra prediction mode according to the mapping code table generated by the generating module.
  • the determining module is configured to determine the availability of the intra prediction reference pixel in the following manner:
  • the neighboring block uses the restricted intra prediction mode
  • the block in which the intra prediction reference pixel is located uses the non-intra prediction mode, or the intra prediction reference pixel is not in the same slice or frame as the current block, Determining that the reference pixel is not present, determining that the intra prediction reference pixel is not available;
  • the intra prediction reference pixel is determined. The point is not available.
  • the present embodiment provides a decoder, where the decoder includes: a determining unit, a generating unit, a first decoding unit, and a second decoding unit, where
  • the determining unit is configured to: determine an intra prediction mode that is inevitably not used in the current block encoding process according to availability of intra prediction reference pixel points in the neighboring block;
  • the generating unit is configured to: remove, according to the intra prediction mode that is not used in the current block coding process determined by the determining module, the intra prediction that the current block is inevitably not used in the encoding process from all the intra prediction modes. a mode, obtaining an available intra prediction mode, assigning an index number to an available intra prediction mode, and generating a mapping code table between the index number and the code word;
  • the first decoding unit is configured to: convert the input codeword into an intra prediction mode index sequence according to the mapping code table generated by the generating unit, and determine an intra prediction mode used by the current block;
  • the second decoding unit is configured to: decode the current block according to the determined intra prediction mode.
  • the determining unit is configured to determine the availability of the intra prediction reference pixel in the following manner:
  • the neighboring block uses the restricted intra prediction mode
  • the block in which the intra prediction reference pixel is located uses the non-intra prediction mode, or the intra prediction reference pixel is not in the same slice or frame as the current block, Determining that the reference pixel is not present, determining that the intra prediction reference pixel is not available;
  • the intra prediction reference pixel is determined. The point is not available.
  • the embodiment provides an electronic device, where the electronic device includes an encoder in a transmitting end, and the encoder can encode an intra prediction mode by using a specific implementation process in the foregoing Embodiment 1, and the specific composition can be implemented by using the foregoing implementation.
  • the description in the third example will not be repeated here.
  • the electronic device may further include a decoder in the receiving end, and the decoding is implemented according to the method provided in the foregoing embodiment.
  • the specific composition of the decoder may be described in the foregoing Embodiment 4, and details are not described herein again. .
  • the electronic device of this embodiment may be a related code stream generating device and a receiving and playing device in a video communication application, for example, a mobile phone, a computer, a server, a set top box, a portable mobile terminal, a digital television, a digital camera, and the like.
  • the sending end is configured to: send video information
  • the receiving end is configured to: receive video information.
  • the above embodiments may be used arbitrarily in combination or separately.
  • This example mainly describes the intra prediction mode coding method of 16x16 blocks.
  • the encoding process is as follows: As shown in Figure 3, there are four 16x16 intra prediction modes: 0 (Vertical), 1 (Horizontal), 2 (DC), 3 ( Plane ).
  • the intra mode code code table is as shown in Table 1 below:
  • the intra mode code code table is as shown in Table 2 below:
  • the encoder determines the used mapping code table according to the above situation, and encodes the intra prediction mode.
  • This example mainly describes the intra-pre-measurement mode coding method of 8x8 block and 4x4 block.
  • the encoding process is as follows:
  • 4x4 intra prediction is taken as an example here.
  • the 8x8 intra prediction method is the same.
  • the pixel points eight, B, C, D, E, F, G, H, and M in the figure are referred to as "upper adjacent"
  • pixels Points I, J, K, and L are called left adjacent intra prediction reference pixels (referred to as "left adjacent”).
  • the intra mode code table is as shown in Table 3 below:
  • the intra mode code table can be as shown in Table 4 below. : Table 4
  • the intra mode code table is as shown in Table 5 below:
  • the encoder determines the used code table according to the above situation, and encodes the intra prediction mode.
  • This example mainly describes the intra-pre-measurement mode decoding method of 16x16 blocks.
  • the decoding process is as follows: With reference to Figure 3, if both pixels in H and V are available, the existing intra prediction mode coding method of H.264/AVC is used.
  • the intra mode code code table is as shown in Table 6 below:
  • the decoder determines the used code table according to the above situation, maps the codeword obtained by analyzing the code stream into an intra mode index number, and further obtains the used intra mode according to the code table mapping.
  • the decoder encodes the current block according to the resulting intra mode.
  • This example mainly describes the intra-pre-measurement mode decoding method for 8x8 and 4x4 blocks. Since the 8x8 intra prediction mode is the same as the intra prediction direction corresponding to the 9 prediction modes used in the 4x4 intra prediction mode, here, 4x4
  • the intra prediction is taken as an example to illustrate the decoding method of the intra mode.
  • the intra mode decoding method of 8x8 intra prediction is the same.
  • the decoding process is as follows:
  • the intra mode code table is as shown in Table 8 below:
  • the intra mode code table can be as shown in Table 9 below. : Table 9
  • the intra mode code code table is as shown in Table 10 below:
  • the decoder determines the used code table according to the above situation, maps the codeword obtained by analyzing the code stream into an intra mode index number, and further obtains the used intra mode according to the code table mapping.
  • the decoder encodes the current block according to the resulting intra mode.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the embodiment of the present invention removes an intra prediction mode that is inevitably unavailable from all intra prediction modes, and performs clipping on the prediction mode index table to adjust the prediction mode.
  • the sequence number is indexed, and the prediction mode index sequence number is encoded by using the unequal length code, thereby reducing the intra prediction mode coding overhead. Therefore, the present invention has strong industrial applicability.

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Abstract

La présente invention se rapporte à un encodeur et à un décodeur de mode de prédiction de trames Intra. L'invention se rapporte d'autre part à un procédé correspondant et à un dispositif électronique associé. Le procédé de codage selon l'invention comprend les étapes suivantes, consistant : sur la base de la disponibilité d'un point de pixel de référence pour une prédiction de trames Intra dans un bloc adjacent à un bloc actuel, à supprimer, de tous les modes de prédiction de trames Intra, un mode de prédiction de trames Intra qui n'est pas utilisé par le bloc actuel durant un processus de codage, de sorte à obtenir des modes de prédiction de trames Intra disponibles ; à allouer des nombres indices aux modes de prédiction de trames Intra disponibles, et à générer une table de codes de mise en correspondance des nombres indices et de mots de code ; et à encoder les modes de prédiction de trames Intra du bloc actuel conformément à la table de codes de mise en correspondance générée. Dans la solution technique décrite dans la présente invention, le mode de prédiction de trames Intra qui n'est pas utilisé est supprimé sur la base de la disponibilité du point de pixel de référence dans le bloc adjacent. Ceci permet ainsi de réduire la charge de données utiles nécessaire au codage des modes de prédiction de trames Intra.
PCT/CN2012/078620 2011-10-20 2012-07-13 Encodeur et décodeur de mode de prédiction de trames intra, procédé correspondant et dispositif électronique associé Ceased WO2013056577A1 (fr)

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KR102327944B1 (ko) 2016-12-23 2021-11-17 후아웨이 테크놀러지 컴퍼니 리미티드 미리 결정된 방향성 인트라 예측 모드들의 세트로부터 방향성 인트라 예측 모드를 제거하기 위한 인트라 예측 장치
CN110650337B (zh) 2018-06-26 2022-04-01 中兴通讯股份有限公司 一种图像编码方法、解码方法、编码器、解码器及存储介质
WO2020013497A1 (fr) * 2018-07-13 2020-01-16 엘지전자 주식회사 Procédé et dispositif de décodage d'image faisant appel à des information de prédiction intra dans un système de codage d'image
CN110072112B (zh) 2019-03-12 2023-05-12 浙江大华技术股份有限公司 帧内预测方法、编码器及存储装置
EP3886435A4 (fr) 2019-06-25 2022-01-26 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé de mappage, codeur, décodeur et support de stockage informatique
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