WO2015113510A1 - Method and apparatus for adaptive motion vector precision - Google Patents

Method and apparatus for adaptive motion vector precision Download PDF

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WO2015113510A1
WO2015113510A1 PCT/CN2015/071854 CN2015071854W WO2015113510A1 WO 2015113510 A1 WO2015113510 A1 WO 2015113510A1 CN 2015071854 W CN2015071854 W CN 2015071854W WO 2015113510 A1 WO2015113510 A1 WO 2015113510A1
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precision
current
adaptive
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French (fr)
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Tzu-Der Chuang
Ching-Yeh Chen
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MediaTek Inc
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MediaTek Inc
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Priority to EP15743708.8A priority patent/EP3085085A4/en
Priority to CN201580003698.5A priority patent/CN105874789B/zh
Priority to US15/111,296 priority patent/US10924746B2/en
Publication of WO2015113510A1 publication Critical patent/WO2015113510A1/en
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Priority to US17/147,298 priority patent/US11546613B2/en
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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
    • H04N19/169—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
    • 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
    • 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
    • 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
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame 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
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • 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
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/523—Motion estimation or motion compensation with sub-pixel accuracy

Definitions

  • the present invention relates to using adaptive motion vector precision for video data.
  • the present invention relates to techniques to improve the performance of video coding by selectively enabling or disabling adaptive motion vector precision for certain types of video data.
  • the present invention also relates to signaling method for the adaptive motion vector precision.
  • High Efficiency Video Coding is a new coding standard that has been developed in recent years.
  • the fixed-size macroblock of H. 264/AVC is replaced by a flexible block, named coding unit (CU) .
  • Pixels in the CU share the same coding parameters to improve coding efficiency.
  • a CU may begin with a largest CU (LCU) , which is also referred as coded tree unit (CTU) in HEVC.
  • CTU coded tree unit
  • prediction unit PU
  • the HEVC extensions include range extensions (RExt) which target at non-4: 2: 0 color formats, such as 4: 2: 2 and 4: 4: 4, and higher bit-depths video such as 12, 14 and 16 bits per sample.
  • RExt range extensions
  • One of the likely applications utilizing RExt is screen sharing, over wired-or wireless-connection. Due to specific characteristics of screen contents, coding tools have been developed and demonstrate significant gains in coding efficiency.
  • the color index coding (a.k.a. major color based coding) techniques represent block of pixels using indices to the palette (major colors) , and encode the palette and the indices by exploiting spatial redundancy.
  • HEVC the sub-pixel motion estimation/motion compensation (ME/MC) is applied.
  • the motion vector (MV) precision is in quarter-pixel accuracy.
  • advanced motion vector prediction has been developed for HEVC, where motion candidates can be derived from spatial and temporal neighboring blocks according to motion vector competition at both the encoder and decoder sides. If a current motion vector is the same as a motion candidate, the encoder may signal the case that the current motion vector can be “merged” with the motion candidate without transmitting the motion information and the corresponding motion vector coding mode is termed as Merge mode.
  • the motion candidate may also be used as a predictor for the current motion vector.
  • the motion vector difference (MVD) between the current motion vector and a selected motion candidate is coded and this method is terms as advanced motion vector prediction (AMVP) .
  • AMVP advanced motion vector prediction
  • the MV predictors and MV differences are also in quarter-pixel accuracy.
  • the sub-pixel motion compensation (MC) is applied.
  • the sub-pixel MC is implemented using 8-tap DCTIF (discrete cosine transform (DCT) interpolation filter) for the luma component and 4-tap DCTIF for the chroma component.
  • DCTIF discrete cosine transform
  • a CU-level adaptive MV precision method has been disclosed by Li, et al. in JCTVC-Q0049 ( “RCE1: Adaptive MV Precision, ” Document of Joint Collaborative Team on Video Coding, JCTVC-Q0049, Mar. 2014) , where a CU-level flag is signaled to indicate whether all PUs in the CU use integer-precision MVs. If the flag is 1, the MV precision is in integer precision. In this case, the MV predictors for PUs are rounded to integer precision and MV differences are signaled in integer precision. If the flag is 0, the MV precision is in quarter-pixel precision.
  • the MV coding is the same as HEVC version 1 and sub-pixel motion compensation is allowed.
  • the adaptive MV precision is applied to all Inter CU.
  • the context formation of the CU-level flag requires the information of the coded adaptive MV precision flag of the upper CU, which results in a requirement of a line buffer to store this flag.
  • a method for coding a block of video data or a motion vector (MV) of the block of video data for a video coding system utilizing adaptive MV precision is disclosed, where at least two MV precisions for the MV is used for the block of video data.
  • whether to use or not to use the adaptive MV precision for a current block is determined according to a prediction mode of the current block, a partition type of the current block, or both. If the adaptive MV precision is used, for an encoder side, a current MV precision is determined for a current MV of the current block, and the current MV is encoded with the current MV precision.
  • a MV precision syntax element is parsed from a video bitstream or is inferred to determine a current MV precision for a current MV of the current block, and the current MV is decoded with the current MV precision. If the adaptive MV precision is not used, for an encoder side, the current MV is encoded with a finer MV precision. For a decoder side, the current MV is decoded with a finer MV precision.
  • the adaptive MV precision can be disabled for the current block if the current block is coded using a Merge mode.
  • the current block may correspond to a prediction unit (PU)
  • the adaptive MV precision can be disabled for the current coding unit (CU) if all PUs in the current CU are coded using the Merge mode.
  • the adaptive MV precision can be disabled for the current block if the current block corresponds to a 2Nx2N prediction unit (PU) .
  • the adaptive MV precision can be disabled for the current block if the current block corresponds to a 2Nx2N prediction unit (PU) coded in a Merge mode or a Skip mode.
  • a high-level adaptive MV precision flag can be signaled at a sequence level, picture level or slice level to enable or disable the adaptive MV precision for all blocks in a corresponding sequence, picture or slice according to the high-level adaptive MV precision flag.
  • a current MV precision syntax element can be further signaled at the encoder side or parsed at the decoder side to identify the current MV precision if the adaptive MV precision is used for the current block. Also a current adaptive MV precision flag can be signaled at the encoder side or parsed at the decoder side to indicate whether the adaptive MV precision is used for the current block.
  • the MV precision syntax element, the current adaptive MV precision flag, or both can be coded by context-based coding with only one context. Alternatively, the MV precision syntax element, the current adaptive MV precision flag, or both can be coded by context-based coding using context modeling based on information of one or more neighboring blocks, the current block, or both said one or more neighboring blocks and the current block.
  • the information of neighboring blocks may correspond to the MV precision of a left block, or the left block and an above block.
  • the current adaptive MV precision flag can be signaled at a slice-level, a CU-level (coding unit level) , or a PU-level (prediction unit level) for the current block if the adaptive MV precision is used for the current block and the current block corresponds to a CU or a PU.
  • the MV precision syntax element, the current adaptive MV precision flag, or both can be coded after all the PU syntax signaling when not all PUs in current CU are coded in merge mode.
  • the MV precision syntax element, the current adaptive MV precision flag, or both can be coded after the first non-merge mode PU.
  • the current MV precision can be inherited from a neighboring block. For example, if the current block is coded in a merge mode, the current MV precision can be inherited from the MV precision of a target merging block.
  • a MV predictor (MVP) for the current MV of the current block is rounded to the coarser granularity.
  • the current MV precision is associated with the MV precision of a MV difference (MVD) of the current MV and the current MV precision corresponds to a coarser granularity
  • the MVD is rounded to the coarser granularity and the MV precision of a MV predictor (MVP) for the current MV is unchanged.
  • MVP MV predictor
  • a value of a current adaptive MV precision flag for a current block is selected to indicate whether to use or not to use the adaptive MV precision for a current block according to a prediction mode of the current block, a partition type of the current block, or both. If the current adaptive MV precision flag indicates that the adaptive MV precision is used, a current MV precision is determined for a current MV of the current block, and the current MV is encoded at the current MV precision. If the current adaptive MV precision flag indicates that the adaptive MV precision is not used, the current MV is encoded at a finer MV precision.
  • Fig. 1 illustrates an exemplary flowchart for video encoding using adaptive motion vector precision according to an embodiment of the present invention.
  • Fig. 2 illustrates an exemplary flowchart for video decoding using adaptive motion vector precision according to an embodiment of the present invention.
  • Fig. 3 illustrates another exemplary flowchart for video encoding using adaptive motion vector precision according to an embodiment of the present invention.
  • MV precision various techniques to control the use of adaptive motion vector (MV) precision are disclosed.
  • the adaptive MV precision is turned off for some modes or coding conditions to improve performance or to reduce complexity/storage requirement.
  • MV fractional motion vector
  • HEVC High Efficiency Video Coding
  • a syntax element or a flag can be signaled at a slice-level, or PU-level to indicate whether the MV precision is integer pixel, half pixel, or quarter pixel.
  • a control flag at a higher-level syntax level such as a sequence-level flag (e.g., in sequence parameter set, SPS) , picture-level (e.g., in picture parameter set, PPS) or slice-level flag (e.g., slice-header) can be signaled to turned on/off the adaptive MV precision syntax.
  • a flag in the picture level may be used to indicate whether the adaptive MV precision is turned on or off for the picture. If the adaptive MV precision is turned off for the picture, all blocks (such as coding units or prediction units) within the picture will not use the adaptive MV precision. In this case, a fixed MV precision at a finer granularity such as quarter-pixel resolution will be used. If the adaptive MV precision is turned on for the picture, the blocks within the picture may determine whether to use the adaptive MV precision individually.
  • the MV precision syntax/flag can be coded using context-based coding and the context modeling can depend on the information of neighboring block (e.g., neighboring CU or neighboring PU) .
  • the context modeling depends on the MV precision of the left PU, the above PU or both the left and the above PU of the current block.
  • the context modelling of the MV precision syntax/flag depends on the above block, which implies the information associated with the row of above blocks has to be buffered.
  • the context modeling only depends on the MV precision of the left PU to remove the need for line buffer to store information associated with the row of above blocks.
  • the context modeling for the MV precision can also depend on the information of current block, such as the depth of current block.
  • the context modeling for the MV precision syntax/flag can depend on the partition type and prediction mode.
  • the context modeling for a Merge mode block can be different from other blocks.
  • the context modeling for 2Nx2N_Merge and 2Nx2N_SKIP block can be different from other blocks.
  • the context modeling for the MV precision only uses one context. This not only removes the need for a line buffer, but also reduces the complexity of context based coding.
  • the adaptive MV precision can be turned on/off or applied for certain types of blocks.
  • the adaptive MV precision can be turned on/off based on the partition type.
  • the adaptive MV precision can be signaled when the block partition is 2Nx2N.
  • the adaptive MV precision can be signaled when the block partition is non-2Nx2N.
  • the adaptive MV precision can be turned on/off based on the prediction mode.
  • the adaptive MV precision can be signaled when the block prediction mode is Merge mode.
  • the adaptive MV precision can be signaled when the block prediction mode is non-Merge mode or inter mode.
  • the adaptive MV precision is only applied for non-2Nx2N_Merge and non-2Nx2N_Skip blocks.
  • the adaptive MV precision flag can be signaled in the CU-level. Furthermore, the MV precision flag can be signaled upon determining the block to be non-2Nx2N_Merge or 2Nx2N_Skip block.
  • the adaptive MV precision is only applied to non-Merge blocks.
  • the adaptive MV precision flag can be signaled in the CU-level or PU-level. For example, if all PUs within a CU are coded in Merge mode, it implies that the adaptive MV precision is turned off and there is no need to signal the MV precision syntax/flag.
  • the MV precision syntax/flag will be signaled only if there is at least one non-Merge PU in the CU.
  • the MV precision syntax/flag can be coded after all the PU syntax signaling when not all PUs in current CU are coded in merge mode. Alternatively, the MV precision syntax/flag can be coded after the first non-merge mode PU.
  • the adaptive MV precision flag can be set to certain value, such as True or False, for certain types of blocks.
  • the adaptive MV precision flag can be set to True or False based on the partition type and/or prediction mode.
  • the adaptive MV precision flag is set to True or False when the block partition is 2Nx2N.
  • the adaptive MV precision flag can be set to True or False when the block partition is non-2Nx2N.
  • the adaptive MV precision flag can be set to True or False when the block prediction mode is Merge mode.
  • the adaptive MV precision flag can be set to True or False when the block prediction mode is non-Merge mode or inter mode.
  • the adaptive MV precision flag can be set to True or False for non-2Nx2N_Merge and non-2Nx2N_Skip blocks.
  • the MV precision for a current block can inherit the MV precision of a neighboring block. For example, if the prediction mode of the current block is Merge mode, the MV precision of the current block can inherit the MV precision of the target merging block. For example, if the current block is merged with the left block, the MV precision of the current block can inherit the MV precision of the left block.
  • the motion vector predictor can be rounded to the target granularity.
  • the MVP at the quarter pixel precision will be rounded to the integer precision.
  • the rounding process can round the value of a MV to a nearest integer.
  • the MVP will be rounded to the integer closer to zero. For example, 0.5 is rounded to 0, and -1.5 is rounded to -1.
  • the rounding can also always be rounded to the nearest integer closer to zero. For example, 0.75 is rounded to zero instead of 1.
  • the motion vector difference (MVD) coding syntax can also be changed. For example, if the MV precision is set to integer, the first two bins of MVD codeword corresponding to the abs_mvd_greater0_flag and abs_mvd_greater1_flag can be skipped, where the abs_mvd_greater0_flag specifies whether the absolute value of a motion vector component difference is greater than 0 and the abs_mvd_greater1_flag specifies whether the absolute value of a motion vector component difference is greater than 1.
  • the context modeling of the MVD coding syntax can be also changed.
  • the context models for syntax elements, abs_mvd_greater0_flag and abs_mvd_greater1_flag of different MV precision can use different sets of context models.
  • the MV precision syntax/flag is associated with the MVD.
  • the MV precision for MVD is set to a coarser granularity
  • the MVD precision can be set to integer and however, the MVP precision is unchanged. In other words, no rounding is applied to MVP.
  • the MV precision syntax/flag is associated with the MVP.
  • the MVP precision can be set to integer and however, the MVD precision is unchanged. In other words, the MVD precision is in a finer precision.
  • the MV information can be inherited from a spatial neighboring block or temporal collocated block without rounding to an integer pixel precision.
  • the MVs may be rounded during the motion compensation (MC) process of this Merge block.
  • the un-rounded MVs are stored and used as predictors for neighboring blocks, and the rounded MVs are used for MC of this Merge block.
  • the adaptive MV precision flag can be signaled after all the PU syntax signaling.
  • the adaptive MV precision flag will be transmitted only when the current CU is not coded in certain modes, such as 2Nx2N Skip/Merge mode, or all PUs in the current CU being Merge mode. Otherwise, the adaptive MV precision flag is inferred as False. Alternatively, the adaptive MV precision flag will be transmitted after the first non-merge mode PU.
  • Fig. 1 illustrates an exemplary flowchart for video encoding using adaptive motion vector precision according to an embodiment of the present invention.
  • the flowchart in Fig. 1 corresponds to encoding process of a block of video data or a motion vector (MV) of the block of video data for a video encoding system utilizing adaptive MV precision.
  • the system allows using at least two MV precisions for encoding the MV or encoding the block of video data.
  • the video data includes screen contents.
  • the MV is used to access reference data and information related to the MV is also encoded.
  • the system receives input data associated with a current block as shown in step 110.
  • the input data may include information related to the current block such as the motion vector, prediction mode, partition type, etc.
  • the information may be derived by other processing units of the encoder system and the input data may be retrieved from memory (e.g., computer memory, buffer (RAM or DRAM) or other media) or from a processor.
  • Whether to use or not to use the adaptive MV precision for the current block is determined according to a prediction mode of the current block, a partition type of the current block, or both as shown in step 120.
  • a test regarding whether the adaptive MV precision used is performed in step 130. If the result is “Yes” , step 140 is performed. If the result is “No” , step 150 is performed.
  • step 140 a current MV precision is determined for a current MV of the current block, and the current MV is encoded at the current MV precision.
  • the current MV is encoded at a finer MV precision.
  • Fig. 2 illustrates an exemplary flowchart for video decoding corresponding to the encoding system of Fig. 1 using adaptive motion vector precision according to an embodiment of the present invention.
  • Coded data for a current block is received in step 210.
  • Whether to use or not to use the adaptive MV precision for a current block is determined in step 220 according to a prediction mode of the current block, a partition type of the current block, or both derived from the coded data.
  • a test regarding whether the adaptive MV precision used is performed in step 230. If the result is “Yes” , step 240 is performed. If the result is “No” , step 250 is performed.
  • a MV precision syntax element is parsed from a video bitstream to determine a current MV precision for a current MV of the current block, and the current MV is decoded at the current MV precision.
  • the current MV is decoded at a finer MV precision.
  • Fig. 3 illustrates another exemplary flowchart for video encoding using adaptive motion vector precision according to an embodiment of the present invention.
  • the system receives input data associated with a current block as shown in step 310.
  • the input data may include information related to the current block such as the motion vector, prediction mode, partition type, etc.
  • the information may be derived by other processing units of the encoder system and the input data may be retrieved from memory (e.g., computer memory, buffer (RAM or DRAM) or other media) or from a processor.
  • a value of a current adaptive MV precision flag is selected for a current block to indicate whether to use or not to use the adaptive MV precision for a current block according to a prediction mode of the current block, a partition type of the current block, or both in step 320.
  • step 330 A test regarding whether the current adaptive MV precision flag indicates that the adaptive MV precision is used is performed in step 330. If the result is “Yes” , step 340 is performed. If the result is “No” , step 350 is performed. In step 340, a current MV precision is determined for a current MV of the current block, and the current MV is encoded at the current MV precision. In step 350, the current MV is encoded at a finer MV precision.
  • Embodiment of the present invention as described above may be implemented in various hardware, software codes, or a combination of both.
  • an embodiment of the present invention can be one or more electronic circuits integrated into a video compression chip or program code integrated into video compression software to perform the processing described herein.
  • An embodiment of the present invention may also be program code to be executed on a Digital Signal Processor (DSP) to perform the processing described herein.
  • DSP Digital Signal Processor
  • the invention may also involve a number of functions to be performed by a computer processor, a digital signal processor, a microprocessor, or field programmable gate array (FPGA) .
  • These processors can be configured to perform particular tasks according to the invention, by executing machine-readable software code or firmware code that defines the particular methods embodied by the invention.
  • the software code or firmware code may be developed in different programming languages and different formats or styles.
  • the software code may also be compiled for different target platforms.
  • different code formats, styles and languages of software codes and other means of configuring code to perform the tasks in accordance with the invention will not depart from the spirit and scope of the invention.

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PCT/CN2015/071854 2014-01-29 2015-01-29 Method and apparatus for adaptive motion vector precision Ceased WO2015113510A1 (en)

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BR112016017201-9A BR112016017201B1 (pt) 2014-01-29 2015-01-29 Método de codificação e decodificação para precisão adaptativa de vetor de movimento de um bloco de dados de vídeo
EP15743708.8A EP3085085A4 (en) 2014-01-29 2015-01-29 Method and apparatus for adaptive motion vector precision
CN201580003698.5A CN105874789B (zh) 2014-01-29 2015-01-29 利用自适应运动向量精度的方法
US15/111,296 US10924746B2 (en) 2014-01-29 2015-01-29 Method and apparatus for adaptive motion vector precision
US17/147,298 US11546613B2 (en) 2014-01-29 2021-01-12 Method and apparatus for adaptive motion vector precision

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US201461952917P 2014-03-14 2014-03-14
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US201461954171P 2014-03-17 2014-03-17
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112016017201B1 (pt) 2014-01-29 2023-09-26 Hfi Innovation Inc Método de codificação e decodificação para precisão adaptativa de vetor de movimento de um bloco de dados de vídeo
US10362336B2 (en) * 2014-03-25 2019-07-23 Qualcomm Incorporated Palette predictor signaling with run length code for video coding
US10412387B2 (en) * 2014-08-22 2019-09-10 Qualcomm Incorporated Unified intra-block copy and inter-prediction
EP3343922A4 (en) * 2015-08-24 2019-07-24 LG Electronics Inc. IMAGE PROCESSING METHOD BASED ON INTERPRETIVE MODE AND ASSOCIATED APPARATUS
US10812822B2 (en) * 2015-10-02 2020-10-20 Qualcomm Incorporated Intra block copy merge mode and padding of unavailable IBC reference region
EP3442232A4 (en) 2016-04-06 2019-12-04 KT Corporation METHOD AND DEVICE FOR PROCESSING A VIDEO SIGNAL
EP3264768A1 (en) * 2016-06-30 2018-01-03 Thomson Licensing Method and apparatus for video coding with adaptive motion information refinement
GB2599566B (en) * 2016-09-08 2022-10-05 V Nova Int Ltd Data processing apparatuses, methods, computer programs and computer-readable media
US11272207B2 (en) * 2017-06-12 2022-03-08 Futurewei Technologies, Inc. Selection and signaling of motion vector (MV) precisions
TWI723430B (zh) * 2018-06-19 2021-04-01 大陸商北京字節跳動網絡技術有限公司 不同精度的多個候選
US11057617B2 (en) 2018-08-03 2021-07-06 Tencent America LLC Method and apparatus for video coding
KR20200026758A (ko) * 2018-09-03 2020-03-11 한국전자통신연구원 영상 부호화/복호화 방법, 장치 및 비트스트림을 저장한 기록 매체
CN119071507A (zh) * 2018-09-11 2024-12-03 有限公司B1影像技术研究所 图像编码/解码方法和图像传输方法
TWI878243B (zh) 2018-09-19 2025-04-01 大陸商北京字節跳動網絡技術有限公司 視頻處理方法、視頻系統中的裝置及非暫時性電腦可讀介質
WO2020098809A1 (en) 2018-11-17 2020-05-22 Beijing Bytedance Network Technology Co., Ltd. Construction of affine candidates in video processing
CN113228675B (zh) 2018-12-21 2024-08-06 北京字节跳动网络技术有限公司 视频处理中的运动矢量比特深度
CN113196773B (zh) 2018-12-21 2024-03-08 北京字节跳动网络技术有限公司 具有运动矢量差的Merge模式中的运动矢量精度
JP7235877B2 (ja) * 2019-01-31 2023-03-08 北京字節跳動網絡技術有限公司 アフィンモード適応型動きベクトル解像度を符号化するためのコンテキスト
WO2020156517A1 (en) 2019-01-31 2020-08-06 Beijing Bytedance Network Technology Co., Ltd. Fast algorithms for symmetric motion vector difference coding mode
CN113647112B (zh) * 2019-03-11 2024-12-31 交互数字Vc控股公司 用于视频编码和解码的熵编解码
JP7241197B2 (ja) * 2019-03-18 2023-03-16 テンセント・アメリカ・エルエルシー ビデオ・コーディングのための方法及び装置
US11134275B2 (en) 2019-06-04 2021-09-28 Tencent America LLC Method and apparatus for performing primary transform based on filtering of blocks
WO2020263158A1 (en) 2019-06-24 2020-12-30 Telefonaktiebolaget Lm Ericsson (Publ) Signaling parameter value information in a parameter set to reduce the amount of data contained in an encoded video bitstream
WO2024186761A1 (en) * 2023-03-03 2024-09-12 Ofinno, Llc Method and apparatus for signaling predicted motion vector difference values

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1863289A2 (en) 2002-07-15 2007-12-05 Mitsubishi Denki Kabushiki Kaisha Apparatus and method for image coding and decoding and communication apparatus
US20120093226A1 (en) 2010-10-13 2012-04-19 Qualcomm Incorporated Adaptive motion vector resolution signaling for video coding
CN102783149A (zh) * 2010-02-19 2012-11-14 高通股份有限公司 用于视频译码的适应性运动分辨率
US20130182760A1 (en) * 2010-09-30 2013-07-18 Panasonic Corporation Image decoding method, image coding method, image decoding apparatus, image coding apparatus, program, and integrated circuit

Family Cites Families (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1441537A4 (en) * 2002-04-19 2006-06-07 Matsushita Electric Industrial Co Ltd METHOD FOR CALCULATING A MOTION VECTOR
JP4130783B2 (ja) * 2002-04-23 2008-08-06 松下電器産業株式会社 動きベクトル符号化方法および動きベクトル復号化方法
KR20050053297A (ko) * 2003-12-02 2005-06-08 학교법인 성균관대학 동영상 부호화 방법 및 장치
US20070002949A1 (en) * 2005-06-30 2007-01-04 Nokia Corporation Fast partial pixel motion estimation for video encoding
US8081682B1 (en) * 2005-10-13 2011-12-20 Maxim Integrated Products, Inc. Video encoding mode decisions according to content categories
US8149909B1 (en) * 2005-10-13 2012-04-03 Maxim Integrated Products, Inc. Video encoding control using non-exclusive content categories
US8170102B2 (en) * 2005-12-19 2012-05-01 Seiko Epson Corporation Macroblock homogeneity analysis and inter mode prediction
US8160150B2 (en) * 2007-04-10 2012-04-17 Texas Instruments Incorporated Method and system for rate distortion optimization
US8761261B1 (en) * 2008-07-29 2014-06-24 Marvell International Ltd. Encoding using motion vectors
KR101590511B1 (ko) * 2009-01-23 2016-02-02 에스케이텔레콤 주식회사 움직임 벡터 부호화/복호화 장치 및 방법과 그를 이용한 영상 부호화/복호화 장치 및 방법
EP2442569A1 (en) * 2009-06-09 2012-04-18 Sony Corporation Image processing device and method
WO2011046587A1 (en) * 2009-10-14 2011-04-21 Thomson Licensing Methods and apparatus for adaptive coding of motion information
TWI566586B (zh) * 2009-10-20 2017-01-11 湯姆生特許公司 一序列形象的現時區塊之寫碼方法和重建方法
TW201515445A (zh) * 2010-04-01 2015-04-16 Sony Corp 圖像處理方法
EP2580912B1 (en) * 2010-07-09 2017-01-25 Samsung Electronics Co., Ltd Method for decoding video by using block merging
US9241160B2 (en) * 2010-07-21 2016-01-19 Dolby Laboratories Licensing Corporation Reference processing using advanced motion models for video coding
US20120051431A1 (en) * 2010-08-25 2012-03-01 Qualcomm Incorporated Motion direction based adaptive motion vector resolution signaling for video coding
CN106412602B (zh) * 2010-09-02 2019-11-15 Lg电子株式会社 编码和解码视频的方法和使用该方法的装置
GB2483294B (en) * 2010-09-03 2013-01-02 Canon Kk Method and device for motion estimation of video data coded according to a scalable coding structure
US9532066B2 (en) * 2011-01-21 2016-12-27 Qualcomm Incorporated Motion vector prediction
JP5883431B2 (ja) * 2011-02-25 2016-03-15 パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ 画像符号化方法および画像復号化方法
PL4184918T3 (pl) * 2011-03-21 2024-06-10 Lg Electronics Inc. Sposób dekodowania wideo, sposób kodowania wideo, odczytywalny komputerowo cyfrowy nośnik zapisu oraz sposób transmisji danych dla wideo
WO2012134246A2 (ko) * 2011-04-01 2012-10-04 엘지전자 주식회사 엔트로피 디코딩 방법 및 이를 이용하는 디코딩 장치
JP5786478B2 (ja) * 2011-06-15 2015-09-30 富士通株式会社 動画像復号装置、動画像復号方法、及び動画像復号プログラム
US9131239B2 (en) * 2011-06-20 2015-09-08 Qualcomm Incorporated Unified merge mode and adaptive motion vector prediction mode candidates selection
KR101889101B1 (ko) * 2011-09-14 2018-08-17 세종대학교산학협력단 메모리 복사를 이용하여 영상을 복원하는 방법 및 장치
AU2012323631B2 (en) * 2011-10-11 2015-09-17 Mediatek Inc. Method and apparatus of motion and disparity vector derivation for 3D video coding and HEVC
EP2716047A4 (en) * 2011-10-19 2015-03-18 Mediatek Inc METHOD AND DEVICE FOR DERIVING MOTION VECTOR PREVIEW CANDIDATE SETS
US9883203B2 (en) * 2011-11-18 2018-01-30 Qualcomm Incorporated Adaptive overlapped block motion compensation
RU2628226C2 (ru) * 2011-12-16 2017-08-15 Сан Пэтент Траст Способ кодирования видеоизображений, устройство кодирования видеоизображений, способ декодирования видеоизображений, устройство декодирования видеоизображений и устройство кодирования/декодирования видеоизображений
US20130188715A1 (en) * 2012-01-09 2013-07-25 Qualcomm Incorporated Device and methods for merge list reordering in video coding
WO2013107931A1 (en) * 2012-01-19 2013-07-25 Nokia Corporation An apparatus, a method and a computer program for video coding and decoding
US9729873B2 (en) * 2012-01-24 2017-08-08 Qualcomm Incorporated Video coding using parallel motion estimation
FR2986395A1 (fr) * 2012-01-30 2013-08-02 France Telecom Codage et decodage par heritage progressif
US9325991B2 (en) * 2012-04-11 2016-04-26 Qualcomm Incorporated Motion vector rounding
US20130272409A1 (en) * 2012-04-12 2013-10-17 Qualcomm Incorporated Bandwidth reduction in video coding through applying the same reference index
US9277222B2 (en) * 2012-05-14 2016-03-01 Qualcomm Incorporated Unified fractional search and motion compensation architecture across multiple video standards
US9258562B2 (en) * 2012-06-13 2016-02-09 Qualcomm Incorporated Derivation of depth map estimate
US20130336406A1 (en) * 2012-06-14 2013-12-19 Qualcomm Incorporated Redundancy removal for merge/skip mode motion information candidate list construction
PL400344A1 (pl) * 2012-08-13 2014-02-17 Politechnika Poznanska Sposób wyznaczania predyktora wektora ruchu
JPWO2014051081A1 (ja) * 2012-09-28 2016-08-25 三菱電機株式会社 動画像符号化装置、動画像復号装置、動画像符号化方法及び動画像復号方法
CA2887452C (en) * 2012-10-09 2018-11-20 Mediatek Inc. Method and apparatus for motion information prediction and inheritance in video coding
WO2014075625A1 (en) * 2012-11-16 2014-05-22 Mediatek Inc. Method and apparatus of constrained disparity vector derivation in 3d video coding
US9106922B2 (en) * 2012-12-19 2015-08-11 Vanguard Software Solutions, Inc. Motion estimation engine for video encoding
US9800857B2 (en) * 2013-03-08 2017-10-24 Qualcomm Incorporated Inter-view residual prediction in multi-view or 3-dimensional video coding
US9491460B2 (en) * 2013-03-29 2016-11-08 Qualcomm Incorporated Bandwidth reduction for video coding prediction
US9432685B2 (en) * 2013-12-06 2016-08-30 Qualcomm Incorporated Scalable implementation for parallel motion estimation regions
US9749642B2 (en) * 2014-01-08 2017-08-29 Microsoft Technology Licensing, Llc Selection of motion vector precision
US10531116B2 (en) * 2014-01-09 2020-01-07 Qualcomm Incorporated Adaptive motion vector resolution signaling for video coding
BR112016017201B1 (pt) 2014-01-29 2023-09-26 Hfi Innovation Inc Método de codificação e decodificação para precisão adaptativa de vetor de movimento de um bloco de dados de vídeo

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1863289A2 (en) 2002-07-15 2007-12-05 Mitsubishi Denki Kabushiki Kaisha Apparatus and method for image coding and decoding and communication apparatus
CN102783149A (zh) * 2010-02-19 2012-11-14 高通股份有限公司 用于视频译码的适应性运动分辨率
US20130182760A1 (en) * 2010-09-30 2013-07-18 Panasonic Corporation Image decoding method, image coding method, image decoding apparatus, image coding apparatus, program, and integrated circuit
US20120093226A1 (en) 2010-10-13 2012-04-19 Qualcomm Incorporated Adaptive motion vector resolution signaling for video coding
CN103202016A (zh) * 2010-10-13 2013-07-10 高通股份有限公司 用于视频译码的自适应运动向量分辨率信令

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
AN J ET AL.: "Progressive MV Resolution", 6. JCT-VC MEETING; 97. MPEG MEETING; 14-7-2011 - 22-7-2011; TORINO; (JOINT COLLABORATIVE TEAM ON VIDEO CODING OF ISO/IEC JTC1/SC29/WG11 AND ITU-T SG.16, 1 July 2011 (2011-07-01), Retrieved from the Internet <URL:HTTP://WFTP3.ITU.INT/AV-ARCH/JCTVC-SITE>
CHUANG, TZU-DER ET AL.: "Non-RCE1: Simplification of RCE1 Test2", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/ IEC JTC 1/SC 29/WG 11, 17TH MEETING: VALENCIA, ES, 4 April 2014 (2014-04-04), XP030116002 *
CHUANG, TZU-DER ET AL.: "Non-RCEl: Simplification of RCE1 Test2", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/ IEC JTC 1/SC 29/WG 11, 17TH MEETING: VALENCIA, ES, 27 March 2014 (2014-03-27)
LI, XIANG ET AL.: "Adaptive MV precision for Screen Content Coding", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/ IEC JTC 1/SC 29/WG 11, 16TH MEETING: SAN JOSÉ, US, 17 January 2014 (2014-01-17), XP030115832 *
See also references of EP3085085A4
ZHOU, YOU ET AL.: "Motion Vector Resolution Control for Screen Content Coding", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 16TH MEETING: SAN JOSE, US
ZHOU, YOU ET AL.: "Motion Vector Resolution Control for Screen Content Coding", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11, 16TH MEETING: SAN JOSÉ, US, 17 January 2014 (2014-01-17), XP030115825 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11917168B2 (en) 2015-06-08 2024-02-27 Tongji University Image encoding and decoding methods, image processing device, and computer storage medium
CN116567213A (zh) * 2016-08-11 2023-08-08 Lx 半导体科技有限公司 编码/解码设备以及发送图像数据的设备
CN109792532B (zh) * 2016-10-04 2023-07-14 高通股份有限公司 用于视频译码的适应性运动向量精准度
CN109792532A (zh) * 2016-10-04 2019-05-21 高通股份有限公司 用于视频译码的适应性运动向量精准度
CN116567209A (zh) * 2016-10-19 2023-08-08 Sk电信有限公司 视频编码/解码设备和方法及非暂时性记录介质
WO2020050752A1 (en) * 2018-09-07 2020-03-12 Huawei Technologies Co., Ltd. Method and apparatus for interpolation filtering for intra- and inter-prediction in video coding
US12439040B2 (en) 2018-09-07 2025-10-07 Huawei Technologies Co., Ltd. Method and apparatus for interpolation filtering for intra- and inter-prediction in video coding
US11968362B2 (en) 2018-09-07 2024-04-23 Huawei Technologies Co., Ltd. Method and apparatus for interpolation filtering for intra- and inter-prediction in video coding
US11405612B2 (en) 2018-09-07 2022-08-02 Huawei Technologies Co., Ltd. Method and apparatus for interpolation filtering for intra- and inter-prediction in video coding
US11323697B2 (en) 2019-04-01 2022-05-03 Beijing Bytedance Network Technology Co., Ltd. Using interpolation filters for history based motion vector prediction
US11595641B2 (en) 2019-04-01 2023-02-28 Beijing Bytedance Network Technology Co., Ltd. Alternative interpolation filters in video coding
US11483552B2 (en) 2019-04-01 2022-10-25 Beijing Bytedance Network Technology Co., Ltd. Half-pel interpolation filter in inter coding mode
US11936855B2 (en) 2019-04-01 2024-03-19 Beijing Bytedance Network Technology Co., Ltd. Alternative interpolation filters in video coding
CN113711592A (zh) * 2019-04-01 2021-11-26 北京字节跳动网络技术有限公司 帧内块复制编码模式中的二分之一像素插值滤波器
CN113711592B (zh) * 2019-04-01 2024-06-28 北京字节跳动网络技术有限公司 帧内块复制编码模式中的二分之一像素插值滤波器
WO2020200235A1 (en) * 2019-04-01 2020-10-08 Beijing Bytedance Network Technology Co., Ltd. Half-pel interpolation filter in intra block copy coding mode
US11503288B2 (en) 2019-08-20 2022-11-15 Beijing Bytedance Network Technology Co., Ltd. Selective use of alternative interpolation filters in video processing
US12075038B2 (en) 2019-08-20 2024-08-27 Beijing Bytedance Network Technology Co., Ltd. Selective use of alternative interpolation filters in video processing

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