WO2021128277A1 - Procédé et appareil de filtrage à boucle adaptatif inter-composantes et dispositif de codage et de décodage vidéo - Google Patents

Procédé et appareil de filtrage à boucle adaptatif inter-composantes et dispositif de codage et de décodage vidéo Download PDF

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Publication number
WO2021128277A1
WO2021128277A1 PCT/CN2019/129168 CN2019129168W WO2021128277A1 WO 2021128277 A1 WO2021128277 A1 WO 2021128277A1 CN 2019129168 W CN2019129168 W CN 2019129168W WO 2021128277 A1 WO2021128277 A1 WO 2021128277A1
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WIPO (PCT)
Prior art keywords
adaptive loop
component
cross
loop filtering
chrominance
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PCT/CN2019/129168
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English (en)
Chinese (zh)
Inventor
姚杰
朱建清
数井君彦
Original Assignee
富士通株式会社
姚杰
朱建清
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Priority to PCT/CN2019/129168 priority Critical patent/WO2021128277A1/fr
Publication of WO2021128277A1 publication Critical patent/WO2021128277A1/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
    • H04N19/102—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
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock

Definitions

  • the embodiments of the present application relate to the technical field of video coding and decoding.
  • HEVC High Efficiency Video Coding
  • DF Deblocking filtering
  • SAO Sample Adaptive Offset filtering
  • ALF adaptive loop filtering
  • the loop filtering information from DF, SAO, and ALF can be provided to the entropy encoder and encoded into the bit stream. After the information is correctly restored at the decoding end, the quality of the video image can be improved.
  • CC-ALF Cross Component Adaptive Loop Filtering
  • VVC Versatile Video Coding
  • CC-ALF Cross Component Adaptive Loop Filtering
  • embodiments of the present application provide a cross-component adaptive loop filtering method, device, and video encoding and decoding equipment.
  • a cross-component adaptive loop filtering method including:
  • a cross-component adaptive loop filtering device including:
  • the filtering part performs adaptive loop filtering on the luminance component of the current sample, and uses the obtained filter output as the residual correction of the chrominance component of the current sample; wherein the difference between the current sample and the adjacent sample The brightness difference is limited to a preset range;
  • a correction part that corrects the chrominance component of the current sample based on the residual correction to obtain a filtered chrominance component.
  • a video encoding and decoding device including a memory and a processor, the memory stores a computer program, and the processor is configured to execute the computer program to implement the following operations:
  • One of the beneficial effects of the embodiments of the present application is: adaptive loop filtering is performed on the luminance component of the current sample, and the obtained filter output is used as the residual correction of the chrominance component of the current sample;
  • the brightness difference between adjacent samples is limited to a preset range.
  • Figure 1 is a schematic diagram of SAO, ALF and CC-ALF;
  • Figure 2 is an example diagram of CC-ALF using diamond filtering
  • Fig. 3 is a schematic diagram of a cross-component adaptive loop filtering method according to an embodiment of the present application
  • FIG. 4 is a schematic diagram of a cross-component adaptive loop filtering device according to an embodiment of the present application.
  • FIG. 5 is another schematic diagram of a cross-component adaptive loop filtering device according to an embodiment of the present application.
  • Fig. 6 is another schematic diagram of a video coding and decoding device according to an embodiment of the present application.
  • the terms “first”, “second”, etc. are used to distinguish different elements from the terms, but they do not indicate the spatial arrangement or chronological order of these elements. These elements should not be used by these terms. Limited.
  • the term “and/or” includes any and all combinations of one or more of the associated listed terms.
  • the terms “comprising”, “including”, “having” and the like refer to the existence of the stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.
  • FIG 1 is a schematic diagram of SAO, ALF and CC-ALF.
  • the luminance component filtered by SAO (represented by the luminance channel y below) is ALF (represented by ALF luminance in Fig. 1) and output The filtered luminance sample value.
  • the chrominance components filtered by SAO are ALF (indicated by ALF chrominance in Figure 1), and the filtered chrominance sample value I 1 is output And I 2 .
  • the output of the chroma channel can be expressed by the following formula:
  • O(x,y) represents the chroma sample value output by the chroma channel
  • I(x,y) represents the chroma sample value output by the ALF
  • ⁇ I i (x,y) represents the chroma channel output by the CC-ALF
  • the filtered chrominance sample value can be output through loop filtering.
  • CC-ALF uses the luminance component to correct the chrominance component.
  • CC-ALF uses a diamond filter on the luminance sample value, and outputs information from the filter at the same location to generate residual corrections ⁇ I 1 and ⁇ I 2 for the chrominance channel.
  • FIG 2 is a CC-ALF using an example of FIG rhombic filter, shown in Figure 2, e.g., CC-ALF may filter the 3 ⁇ 4 sample values, it may represent chrominance channels i of CC-ALF using the S i range. 2, the S i can comprise 8 sample values, where (x C, y C) denotes the present sample.
  • the residual correction of the chroma channel can be expressed by the following formula:
  • ⁇ I i (x,y) represents the residual correction of chroma channel i
  • S i represents the CC-ALF range of chroma channel i
  • I 0 (x C +x 0 ,y C +y 0 ) represents the sample (x C +x 0 ,y C +y 0 ) brightness value
  • c i (x 0 ,y 0 ) represents the weighting coefficient of CC-ALF for chroma channel i.
  • yCbCr is taken as an example for description, but the present application is not limited to this, for example, it can also be applied to other luminance channels and chrominance channels.
  • CC-ALF takes 3 ⁇ 4 diamond filtering as an example for description, but the application is not limited to this, for example, other filtering methods may also be used.
  • Fig. 3 is a schematic diagram of a cross-component adaptive loop filtering method according to an embodiment of the present application. As shown in Figure 3, the method includes:
  • the luminance component input in 301 may be a sample value after SAO filtering.
  • SAO filtering and ALF on the luminance component and the chrominance component please refer to the related technologies of SAO and ALF for details.
  • CC-ALF for details on how to perform CC-ALF, please refer to Figure 2 and related technologies.
  • Figure 3 above only schematically illustrates part of the relevant content of the embodiments of the present application, but the present application is not limited thereto.
  • the order of execution among various operations can be appropriately adjusted, and some other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of FIG. 3 above.
  • ⁇ I i (x, y) represents the residual correction of chroma channel i
  • (x C , y C ) represents the current sample
  • S i represents the CC-ALF range of chroma channel i
  • I 0 (x C , y C) represents the luminance value of the current sample
  • S i indicates the sample in addition to the current neighboring samples
  • I 0 (x C + x 0, y C + y 0) Represents the luminance value of adjacent samples (x C + x 0 , y C + y 0 );
  • c i (x 0 , y 0 ) represents the weight coefficient of CC-ALF for chrominance channel i.
  • a limiting function may be used to limit the brightness difference between the current sample and the adjacent sample within a preset range, and the filtering performed in this way may be referred to as non-linear CC-ALF.
  • the operation of limiting the brightness difference between the current sample and the adjacent sample in the CC-ALF to a preset range is simply referred to as limiting the CC-ALF.
  • the present application is not limited to the limiting function, and other implementation manners that limit the brightness difference between the current sample and the adjacent sample can be applied to the present application.
  • the limiting function is expressed as follows:
  • K is the limiting function
  • d is the input parameter
  • b is the preset limiting range.
  • this application is not limited to this, and other limiting functions can also be used.
  • the formula (3) can be transformed based on the limiting function. For example, the following formula is used to obtain the residual correction of the chrominance channel:
  • ⁇ I i (x,y) represents the residual correction of the chrominance channel i
  • I 0 (x C ,y C ) represents the brightness value of the current sample (x C ,y C )
  • I 0 (x C + x 0 , y C + y 0 ) represents the luminance value of the adjacent samples (x C + x 0 , y C + y 0 )
  • S i represents the CC-ALF range of the chrominance channel i
  • c i (x 0 , y 0 ) represents the weight coefficient of the CC-ALF of the chrominance channel i
  • K represents the limiting function
  • k(x 0 , y 0 ) represents the preset range.
  • k(x 0 , y 0 ) is a clipping parameter related to position (x 0 , y 0 ).
  • a limiting parameter can be specified for each filter coefficient. Through this adaptive limiting, the difference between the input sample value to be filtered and the adjacent input sample of the filter can be limited.
  • the encoder can perform optimization to find the best k(x 0 , y 0 ) related to the weight of each filter.
  • ALF is performed on the luminance component of the current sample, and the obtained filtered output is used as the residual correction of the chrominance component of the current sample; wherein the luminance difference between the current sample and adjacent samples is limited to the preset range Inside. It can improve the efficiency of CC-ALF and further improve the coding and decoding performance of chrominance components.
  • the above cross-component adaptive loop filtering method can be performed on the encoding end and/or the decoding end.
  • the encoding end can also encode the CC-ALF limiting information into the bit stream, so that the decoding end can perform better decoding based on the information, thereby further improving the encoding and decoding performance.
  • the limit value corresponding to the preset range may be preset. For example, only 4 fixed values may be used, and the limit value includes 1023, 201, 39, and 8. And these limit values can be correlated with the limit index, as shown in Table 1.
  • a diamond filter as an example of 3 ⁇ 4 S i may include eight sample values; thus each chrominance channel may correspond to up to seven limit value.
  • each chroma channel may correspond to more than 7 clipping values, or may also correspond to less than 7 clipping values.
  • indication information indicating whether to limit the CC-ALF may be incorporated into the bitstream.
  • the indication information may be represented by ccalf_cb_clip_flag or ccalf_cr_clip_flag.
  • the default value of ccalf_cb_clip_flag or ccalf_cr_clip_flag is, for example, 0 (false).
  • ccalf_cb_clip_flag is 0, which means that CC-ALF is not clipped
  • ccalf_cb_clip_flag 1, which means that CC-ALF is clipped
  • ccalf_cr_clip_flag is 0, which means that CC-ALF is not clipped
  • ccalf_cr_clip_flag is 1, which means that CC-ALF is clipped.
  • the clip index corresponding to the clip value of the preset range may be encoded into the bitstream.
  • the clip index may be represented by ccalf_cb_clip_idx or ccalf_cr_clip_idx.
  • the default value of ccalf_cb_clip_idx or ccalf_cr_clip_idx is 0, for example.
  • the index "0" (for example, using two-bit 00) can be programmed into the bitstream; if CC-ALF uses 201 for clipping, Then the index "1" (for example, using two bits of 01) can be incorporated into the bit stream; if CC-ALF uses 39 for clipping, then the index "2" (for example, using two bits of 10) can be incorporated into the bit stream. In the stream; if CC-ALF uses 8 for clipping, the index "3" (for example, using two bits of 11) can be encoded into the bit stream.
  • Table 2 exemplarily shows the syntax of the nonlinear CC-ALF of the embodiment of the present application.
  • Table 2 exemplarily describes the embodiments of the present application, but the present application is not limited thereto.
  • the encoding end has been schematically described above.
  • the decoding end can receive the bit stream accordingly and decode it accordingly.
  • the indication information indicating whether to limit the CC-ALF can be decoded from the bitstream.
  • the CC-ALF can be clipped according to the indication information and the index, So as to better perform loop filtering at the decoding end.
  • the index corresponding to the clip value of the preset range may be decoded from the bitstream.
  • the clip index ccalf_cb_clip_idx in the bitstream can be further obtained.
  • the index is "0" (for example, using two-bit 00)
  • CC-ALF is limited by 1023
  • the index is "1” (for example, using two-bit 01)
  • CC-ALF uses 201 for clipping
  • the index is “2” (for example, using two-bit 10)
  • CC-ALF uses 39 for clipping
  • the index is “3” (for example, using two-bit 11 )
  • adaptive loop filtering is performed on the luminance component of the current sample, and the obtained filter output is used as the residual correction of the chrominance component of the current sample; the difference between the current sample and the adjacent sample is The brightness difference is limited within the preset range.
  • the efficiency of CC-ALF can be improved, and the coding and decoding performance of chrominance components can be further improved.
  • FIG. 4 is a schematic diagram of a cross-component adaptive loop filter device according to an embodiment of the present application. As shown in FIG. 4, the cross-component adaptive loop filter device 400 includes:
  • the filtering unit 401 which performs adaptive loop filtering on the luminance component of the current sample, and uses the obtained filter output as the residual correction of the chrominance component of the current sample; wherein the current sample is between the adjacent samples
  • the brightness difference of is limited to a preset range
  • the correction unit 402 corrects the chrominance component of the current sample based on the residual correction to obtain the filtered chrominance component.
  • a limiting function is used to limit the brightness difference between the current sample and the adjacent sample within a preset range.
  • the limiting function is expressed as follows:
  • K is the limiting function
  • d is the input parameter
  • b is the preset limiting range.
  • the following formula is used to obtain the residual correction of the chrominance channel:
  • ⁇ I i (x,y) represents the residual correction of chroma channel i
  • I 0 (x C ,y C ) represents the brightness value of the current sample (x C ,y C )
  • I 0 (x C + x 0 , y C + y 0 ) represents the luminance value of the adjacent samples (x C + x 0 , y C + y 0 )
  • S i represents that the chrominance channel i performs the cross-component adaptive loop
  • the filtering range, c i (x 0 , y 0 ) represents the weight coefficient of the cross-component adaptive loop filtering performed by the chrominance channel i
  • K represents the limiting function
  • k(x 0 , y 0 ) Indicates the preset range.
  • the cross-component adaptive loop filtering device 400 further includes:
  • the encoding unit 403 encodes the instruction information indicating whether to limit the cross-component adaptive loop filtering into the bit stream.
  • the encoding unit 403 also encodes the index corresponding to the clip value of the preset range into the bitstream in the case of clipping the cross-component adaptive loop filtering.
  • FIG. 5 is another schematic diagram of the cross-component adaptive loop filtering device according to an embodiment of the present application.
  • the cross-component adaptive loop filtering device 500 includes: a filtering unit 501 and a correction unit 502; as described above.
  • the cross-component adaptive loop filtering device 500 further includes:
  • the decoding unit 503 decodes the instruction information indicating whether to limit the cross-component adaptive loop filter from the bit stream.
  • the decoding unit 503 also decodes the clip corresponding to the preset range from the bit stream when the indication information indicates that the cross-component adaptive loop filtering is to be clipped.
  • the index of the value is the index of the value.
  • the cross-component adaptive loop filtering uses a diamond filter
  • the chrominance channel includes Cb and Cr channels
  • the luminance channel includes a y channel.
  • each of the chrominance channels corresponds to a maximum of 7 clipping values; the clipping values include 1023, 201, 39, and 8.
  • the cross-component adaptive loop filtering device 400 or 500 may also include other components or modules.
  • FIG. 4 or 5 only exemplarily shows the connection relationship or signal direction between the various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned various components or modules may be implemented by hardware facilities such as a processor and a memory; the implementation of this application does not limit this.
  • adaptive loop filtering is performed on the luminance component of the current sample, and the obtained filter output is used as the residual correction of the chrominance component of the current sample; the difference between the current sample and the adjacent sample is The brightness difference is limited within the preset range.
  • the efficiency of CC-ALF can be improved, and the coding and decoding performance of chrominance components can be further improved.
  • the embodiments of the present application also provide a video encoding and decoding device, which performs image processing or video processing, and may be an encoder on the encoding end, a decoder on the decoding end, or a device including an encoder and a decoder. equipment.
  • Fig. 6 is a schematic diagram of a video encoding and decoding device according to an embodiment of the present application.
  • a video encoding and decoding device 600 may include: a processor 601 and a memory 602; the memory 602 is coupled to the processor 601.
  • the memory 602 can store various data; in addition, it also stores an information processing program 603, and the program 603 is executed under the control of the processor 601.
  • the functions of the cross-component adaptive loop filtering device 400 or 500 may be integrated into the processor 601.
  • the processor 601 may be configured to implement the cross-component adaptive loop filtering method as described in the embodiment of the first aspect.
  • the processor 601 may be configured to perform the following control: perform adaptive loop filtering on the luminance component of the current sample, and use the obtained filtered output as the residual correction of the chrominance component of the current sample; The luminance difference between the current sample and the adjacent sample is limited within a preset range; and the chrominance component of the current sample is corrected based on the residual correction to obtain a filtered chrominance component.
  • the video codec device 600 may further include: an input/output (I/O) device 604, a display 605, etc.; wherein the functions of the above-mentioned components are similar to those in the prior art, and will not be repeated here. It is worth noting that the video codec device 600 does not necessarily include all the components shown in FIG. 6; in addition, the video codec device 600 may also include components not shown in FIG. 6, such as a camera, Hard Disk Drive (HDD, Hard Disk Driver), etc.; refer to related technologies.
  • HDD Hard Disk Drive
  • the embodiments of the present application provide a computer-readable program, wherein when the program is executed in a video coding/decoding device or an electronic device, the program causes the electronic device to execute the cross-component autonomy described in the embodiment of the first aspect.
  • An embodiment of the present application provides a storage medium storing a computer-readable program, wherein the computer-readable program enables a video codec device or an electronic device to perform the cross-component adaptive loop filtering as described in the embodiment of the first aspect method.
  • the above devices and methods of this application can be implemented by hardware, or can be implemented by hardware combined with software.
  • This application relates to such a computer-readable program, when the program is executed by a logic component, the logic component can realize the above-mentioned device or constituent component, or the logic component can realize the above-mentioned various methods Or steps.
  • This application also relates to storage media used to store the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.
  • the method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two.
  • one or more of the functional block diagrams and/or one or more combinations of the functional block diagrams shown in the figure may correspond to each software module of the computer program flow or each hardware module.
  • These software modules can respectively correspond to the steps shown in the figure.
  • These hardware modules can be implemented by solidifying these software modules by using a field programmable gate array (FPGA), for example.
  • FPGA field programmable gate array
  • the software module can be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.
  • a storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be a component of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or a large-capacity flash memory device.
  • One or more of the functional blocks and/or one or more combinations of the functional blocks described in the drawings can be implemented as general-purpose processors, digital signal processors (DSPs) for performing the functions described in this application. ), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any appropriate combination thereof.
  • DSPs digital signal processors
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, or multiple micro-processing Processor, one or more microprocessors in communication with the DSP, or any other such configuration.

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Abstract

L'invention concerne un procédé et un appareil de filtrage à boucle adaptatif inter-composantes, ainsi qu'un dispositif de codage et de décodage vidéo. Le procédé comprend les étapes consistant à : effectuer un filtrage à boucle adaptatif sur une composante de luminance d'un échantillon actuel et considérer une sortie filtrée obtenue comme une correction résiduelle d'une composante de chrominance de l'échantillon actuel, une valeur de différence de luminance entre l'échantillon actuel et un échantillon adjacent étant limitée dans une plage prédéfinie ; et corriger la composante de chrominance de l'échantillon actuel sur la base de la correction résiduelle de façon à obtenir une composante de chrominance filtrée.
PCT/CN2019/129168 2019-12-27 2019-12-27 Procédé et appareil de filtrage à boucle adaptatif inter-composantes et dispositif de codage et de décodage vidéo WO2021128277A1 (fr)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
EP3297282A1 (fr) * 2016-09-15 2018-03-21 Thomson Licensing Procédé et appareil pour codage vidéo avec écrêtage adaptatif
CN109691102A (zh) * 2016-08-31 2019-04-26 高通股份有限公司 跨分量滤波器

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CN109691102A (zh) * 2016-08-31 2019-04-26 高通股份有限公司 跨分量滤波器
EP3297282A1 (fr) * 2016-09-15 2018-03-21 Thomson Licensing Procédé et appareil pour codage vidéo avec écrêtage adaptatif

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C.-Y. CHEN, A. SEGALL: "Description of Core Experiment 5 (CE5): Cross-component adaptive loop filtering", 16. JVET MEETING; 20191001 - 20191011; GENEVA; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-P2025 ; m51522, 12 October 2019 (2019-10-12), XP030218459 *
J. TAQUET (CANON), C. GISQUET (CANON), G. LAROCHE (CANON), P. ONNO (CANON),: "Non-linear Adaptive Loop Filter", 125. MPEG MEETING; 20190114 - 20190118; MARRAKECH; (MOTION PICTURE EXPERT GROUP OR ISO/IEC JTC1/SC29/WG11), no. m45655, 2 January 2019 (2019-01-02), XP030197953 *
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V. SEREGIN (QUALCOMM), C.-Y. CHEN (MEDIATEK),: "CE5: Summary Report on Adaptive Loop Filter", 14. JVET MEETING; 20190319 - 20190327; GENEVA; (THE JOINT VIDEO EXPLORATION TEAM OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16 ), no. JVET-N0025, 19 March 2019 (2019-03-19), XP030203579 *

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