WO2020140242A1 - 视频处理方法和装置 - Google Patents

视频处理方法和装置 Download PDF

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Publication number
WO2020140242A1
WO2020140242A1 PCT/CN2019/070306 CN2019070306W WO2020140242A1 WO 2020140242 A1 WO2020140242 A1 WO 2020140242A1 CN 2019070306 W CN2019070306 W CN 2019070306W WO 2020140242 A1 WO2020140242 A1 WO 2020140242A1
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Prior art keywords
current block
reference frame
block
list
motion vector
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PCT/CN2019/070306
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English (en)
French (fr)
Inventor
王苏红
郑萧桢
王苫社
马思伟
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北京大学
深圳市大疆创新科技有限公司
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Application filed by 北京大学, 深圳市大疆创新科技有限公司 filed Critical 北京大学
Priority to PCT/CN2019/070306 priority Critical patent/WO2020140242A1/zh
Priority to CN202311024533.9A priority patent/CN116866605A/zh
Priority to CN201980004606.3A priority patent/CN111164976A/zh
Priority to CN201980009160.3A priority patent/CN111630860A/zh
Priority to PCT/CN2019/130881 priority patent/WO2020140916A1/zh
Priority to CN201980009017.4A priority patent/CN111630861B/zh
Priority to CN202110897611.0A priority patent/CN113453015B/zh
Priority to KR1020217021168A priority patent/KR20210094089A/ko
Priority to CN202110896384.XA priority patent/CN113507612B/zh
Priority to EP19907744.7A priority patent/EP3908002A4/en
Priority to JP2021537058A priority patent/JP7328337B2/ja
Priority to PCT/CN2019/130869 priority patent/WO2020140915A1/zh
Priority to CN202110501154.9A priority patent/CN113194314B/zh
Publication of WO2020140242A1 publication Critical patent/WO2020140242A1/zh
Priority to US17/365,871 priority patent/US20210337232A1/en
Priority to JP2023121689A priority patent/JP2023139221A/ja

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    • 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
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    • H04N19/172—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 picture, frame or field
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    • 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
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    • H04N19/577—Motion compensation with bidirectional frame interpolation, i.e. using B-pictures

Definitions

  • the present application relates to the field of video encoding and decoding, and more specifically, to a video processing method and device.
  • the video encoding process includes the inter prediction process.
  • the modes of inter prediction include merge mode and non-merge mode. In merge mode, it is usually necessary to construct the merge mode motion vector candidate list first, and select the motion vector of the current block from the merge mode motion vector candidate list.
  • the current block may also be called a current coding unit (CU).
  • the inter-frame prediction method introduces alternative/advanced temporal motion vector prediction (ATMVP) technology.
  • ATMVP alternative/advanced temporal motion vector prediction
  • the current block is divided into multiple sub-blocks, and the motion information of the sub-blocks is calculated.
  • the ATMVP technology aims to introduce motion vector prediction at the sub-block level to improve the overall encoding performance of the video.
  • the process of using ATMVP technology to find the motion information of the sub-block of the current block is relatively complicated, and there are some redundant operations.
  • the present application provides a video processing method and device, which can simplify codec operations.
  • a video processing method including: obtaining a reference frame list of a current block, the reference frame list of the current block including a first reference frame list and a second reference frame list; according to the reference frame of the current block List to determine a target reference frame list, the target reference frame list being one of the first reference frame list and the second reference frame list; when determining the current block according to the target reference frame list of the current block Domain motion vector; determining the motion information of the sub-block of the current block according to the time domain motion vector; performing inter prediction on the current block according to the motion information of the sub-block of the current block.
  • a video processing device including: a memory for storing code; a processor for executing the code stored in the memory to perform the following operations: obtaining a reference frame list of the current block, the current The reference frame list of the block includes a first reference frame list and a second reference frame list; a target reference frame list is determined according to the reference frame list of the current block, and the target reference frame list is the first reference frame list and all One of the second reference frame lists; determining the time domain motion vector of the current block according to the target reference frame list of the current block; determining the motion information of the sub-blocks of the current block according to the time domain motion vector; The motion information of the sub-blocks of the current block performs inter prediction on the current block.
  • a computer-readable storage medium is provided on which instructions for performing the method of the first aspect are stored.
  • a computer program product including instructions for performing the method of the first aspect.
  • codec operations can be simplified.
  • Figure 1 is a flow chart of constructing affiliate list.
  • FIG. 2 is a schematic diagram of surrounding blocks of the current block.
  • FIG. 3 is a flow chart of the ATMVP implementation process.
  • FIG. 4 is an exemplary diagram of a manner of acquiring motion information of sub-blocks of the current block.
  • FIG. 5 is a schematic flowchart of a video processing method provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a video processing device provided by an embodiment of the present application.
  • This application can be applied to a variety of video coding standards, such as H.264, high efficiency video coding (HEVC), universal video coding (versatile video coding, VVC), audio and video coding standard (audio video coding standard, AVS), AVS+, AVS2 and AVS3 etc.
  • video coding standards such as H.264, high efficiency video coding (HEVC), universal video coding (versatile video coding, VVC), audio and video coding standard (audio video coding standard, AVS), AVS+, AVS2 and AVS3 etc.
  • the video coding process mainly includes prediction, transformation, quantization, entropy coding, loop filtering and other parts.
  • Prediction is an important part of mainstream video coding technology. Prediction can be divided into intra prediction and inter prediction. Inter prediction can be achieved through motion compensation. The following is an example of the motion compensation process.
  • the coding region may also be called a coding tree unit (CTU).
  • the size of the CTU may be, for example, 64 ⁇ 64 or 128 ⁇ 128 (units are pixels, and the units will be omitted for similar descriptions hereinafter).
  • Each CTU can be divided into square or rectangular image blocks.
  • the image block may also be referred to as a coding unit (CU).
  • CU coding unit
  • the current CU to be encoded will be referred to as a current block.
  • a similar block of the current block can be found from the reference frame (which may be a reconstructed frame near the time domain) as the prediction block of the current block.
  • the relative displacement between the current block and the similar block is called a motion vector (motion vector, MV).
  • the process of finding a similar block in the reference frame as the prediction block of the current block is motion compensation.
  • Inter prediction modes include merge mode and non-merge mode.
  • the motion vector (MV) of the image block is the motion vector prediction (motion vector prediction (MVP) of the image block. Therefore, for the merge mode, the MVP index and reference frame are transmitted in the code stream Just index.
  • the non-merge mode not only needs to transmit the MVP and the reference frame index in the code stream, but also needs to transmit the motion vector difference (MVD) in the code stream.
  • the traditional motion vector uses a simple translation model, that is, the motion vector of the current block represents the relative displacement between the current block and the reference block. This type of motion vector is difficult to accurately describe the more complex motion conditions in the video, such as zoom, rotation, perspective, etc.
  • affine models affine models
  • the affine model uses the motion vectors of two or three control points (CP) of the current block to describe the affine sports field of the current block.
  • the two control points may be, for example, the upper left corner point and the upper right corner point of the current block; the three control points may be, for example, the upper left corner point, the upper right corner point, and the lower left corner point of the current block.
  • the affine model is combined with the merge mode mentioned above to form the affine merge mode.
  • the ordinary merge mode motion vector candidate list (merge, candidate list) records the MVP of the image block
  • the affine merge mode motion vector candidate list (affine, merge, candidate, list) records the control point motion vector prediction (control point motion vector prediction) vector (prediction, CPMVP).
  • the affine merge mode does not need to add MVD in the code stream, but directly uses CPMVP as the CPMV of the current block.
  • the construction of the affine mergecandidate list of the current block is one of the important processes of the affine merge mode.
  • Figure 1 shows a possible construction of the affine merge candidate list (affine fusion candidate list).
  • Step S110 Insert ATMVP in the affiliate merged list of the current block.
  • ATMVP contains the motion information of the sub-blocks of the current block.
  • the affiliate merge list will insert the motion information of the sub-block of the current block, so that the affiliate mode can perform motion compensation at the sub-block level, thereby improving the overall encoding performance of the video.
  • the motion information includes a combination of one or more of the following information: motion vector; motion vector difference; reference frame index value; reference direction of inter prediction; information of image block using intra coding or inter coding; image block The division mode.
  • step S120 the inherited affiliates are inserted in the affiliate candidate list.
  • step S130 it is judged whether the number of affiliated candidates in the affiliate merged list is less than a preset value.
  • step S140 If the number of affine candidates in the affine mergecandidate list has reached the preset value, the process of FIG. 1 is ended; if the number of affine candidates in the affine mergecandidate list is less than the preset value, proceed to step S140.
  • step S140 the constructed affiliated candidates are inserted into the affiliated candidate list.
  • step S150 it is judged whether the number of affiliates in the affiliate merged list is less than the preset value.
  • step S160 If the number of affiliate candidates in the affiliate merged list has reached the preset value, the process of FIG. 1 is ended; if the number of affiliate candidates in the affiliate merged list is less than the preset value, continue to step S160.
  • step S160 a 0 vector is inserted into the affine mergecandidate list.
  • step S110 in FIG. 1 will be described in detail with reference to FIG. 3 below.
  • the implementation of the ATVMP technology that is, the method of acquiring the motion information of the sub-block of the current block can be roughly divided into two steps: steps S310 and S320.
  • step S310 a corresponding block (corresponding block) in the reference frame of the current block is determined.
  • the frame used for acquiring motion information in the current frame (the frame where the current block is located) is called a co-located picture.
  • the co-located frame of the current frame is set when the slice is initialized.
  • the first reference frame list may be a forward reference frame list or a reference frame list that includes the first group of reference frames.
  • the first group of reference frames includes reference frames in time sequence before and after the current frame.
  • the first frame in the first reference frame list of the current block is usually set as the co-located frame of the current frame.
  • the corresponding block of the current block in the reference frame is determined by a temporal motion vector (tempMV). Therefore, in order to obtain the corresponding block of the current block in the reference frame, the time-domain motion vector needs to be derived first.
  • tempMV temporal motion vector
  • forward prediction and bidirectional prediction are taken as examples to explain the derivation process of the time-domain motion vector.
  • the number of reference frame lists (also referred to as reference lists or reference image lists) of the current block is 1.
  • the reference frame list of the current block may be called a first reference frame list (reference list 0).
  • the first reference frame list may be a forward reference frame list.
  • the co-located frame of the current frame is usually set as the first frame in the first reference frame list.
  • the current motion vector candidate list can be scanned first (the motion vector candidate list can be constructed based on the motion vectors of the image blocks of 4 adjacent positions in the spatial domain), and the motion vector candidate list The first candidate motion vector is used as the initial time domain motion vector. Then, the first reference frame list of the current block is scanned.
  • the first candidate motion vector can be used as the time domain motion vector; if the first If the reference frame of a candidate motion vector is different from the co-located frame of the current frame, you can set the time domain motion vector to 0 vector and stop scanning.
  • the number of reference frame lists of the current block is 2, which includes the first reference frame list (reference list 0) and the second reference frame list (reference list 1).
  • the first reference frame list may be a forward reference frame list
  • the second reference frame list may be a backward reference frame list.
  • the current motion vector candidate list can be scanned first, and the first candidate motion vector in the motion vector candidate list can be used as the initial time domain motion vector.
  • first scan a reference frame list (may be the first reference frame list or the second reference frame list) in the current reference direction of the current block, if the reference frame of the first candidate motion vector and the current frame If the co-located frame is the same, the first candidate motion vector can be used as the time-domain motion vector; if the reference frame of the first candidate motion vector is different from the co-located frame of the current frame, continue scanning in the other reference direction of the current block List of reference frames.
  • both the first reference frame list and the second reference frame list may include reference frames before and after the current frame in chronological order.
  • the bidirectional prediction refers to the first reference frame list. A reference frame with a different reference direction is selected from the second reference frame list.
  • the scanning order of the first reference frame list and the second reference frame list can be determined according to the following rules:
  • the second reference frame list is scanned first; otherwise, the first frame is scanned first.
  • the current frame adopts a low delay (low delay) coding mode to indicate that the playback sequence of the reference frame of the current frame in the video sequence is before the current frame; the co-located frame of the current frame is set to the first in the second reference frame list
  • One frame may indicate that the quantization step of the first slice of the first reference frame list of the current frame is smaller than the quantization step of the first slice of the second reference frame list.
  • the time-domain motion vector can be used to find the corresponding block of the current block in the reference frame.
  • step S320 according to the corresponding block of the current block, the motion information of the sub-block of the current block is acquired.
  • the current block may be divided into multiple sub-blocks, and then the motion information of the sub-blocks in the corresponding block is determined. It is worth noting that for each sub-block, the motion information of the corresponding block can be determined by the smallest motion information storage unit where it is located.
  • the motion information includes a combination of one or more of the following information: motion vector; motion vector difference; reference frame index value; reference direction of inter prediction; information of image block using intra coding or inter coding; image block The division mode.
  • the reference frames in the first reference frame list and the second reference frame list will have certain The degree of overlap, therefore, in the process of acquiring the time domain motion vector, there will be redundant operations on the scanning process of the two reference frame lists.
  • FIG. 5 is a schematic flowchart of a video processing method provided by an embodiment of the present application. The method of FIG. 5 can be applied to the encoding side and also to the decoding side.
  • a reference frame list of the current block is obtained.
  • the reference frame list of the current block includes a first reference frame list and a second reference frame list.
  • the current block may also be called the current CU.
  • the reference frame list of the current block includes a first reference frame list and a second reference frame list, indicating that the current block is to perform bidirectional prediction between frames.
  • the first reference frame list may be a forward reference frame list, or may be a reference frame list containing a first group of reference frames.
  • the first group of reference frames includes reference frames in time sequence before and after the current frame.
  • the second reference frame list may be a backward reference frame list, or a reference frame list containing a second group of reference frames, the second group of reference frames including the time sequence before the current frame And subsequent reference frames.
  • both the first reference frame list and the second reference frame list may include reference frames before and after the current frame in chronological order.
  • the bidirectional prediction may refer to the first reference frame list and Reference frames with different reference directions are selected in the second reference frame list.
  • step S520 the target reference frame list is determined according to the reference frame list of the current block.
  • the target reference frame list is one of the first reference frame list and the second reference frame list.
  • the target reference frame list can be selected randomly or according to certain rules. For example, it can be selected according to the following rule: if the current frame where the current block is located adopts the low-latency encoding mode, and the co-located frame of the current frame is the first frame in the second reference frame list, the second reference frame list is determined as the target reference Frame list; and/or if the current frame where the current block is located does not adopt the low-latency encoding mode or the co-located frame of the current frame is not the first frame in the second reference frame list, determine the first reference frame list as the target reference frame list .
  • step S530 the time domain motion vector of the current block is determined according to the target reference frame list of the current block.
  • the embodiment of the present application determines the time domain motion vector of the current block according to one reference frame list in the first reference frame list and the second reference frame list. In other words, regardless of whether the time-domain motion vector can be derived from the target reference frame list, the scanning is stopped after the target reference frame list is scanned. In other words, the time-domain motion vector of the current block can be determined only from the target reference frame list.
  • the first candidate motion vector can be selected from the current motion vector candidate list (the motion vector candidate list can be constructed based on the motion vectors of image blocks at four adjacent positions in the spatial domain); find it from the target reference frame list
  • the scanning is also stopped, instead of continuing to scan another reference frame list of the current block as described in the embodiment of FIG. 3, in this case, the 0 vector can be used as Time domain motion vector of the current block.
  • step S540 the motion information of the sub-block of the current block is determined according to the time-domain motion vector.
  • the corresponding block of the current block in the reference frame may be determined according to the time-domain motion vector.
  • the motion information of the sub-block of the current block may be determined according to the corresponding block of the current block in the reference frame.
  • the motion information includes a combination of one or more of the following information: motion vector; motion vector difference; reference frame index value; reference direction of inter prediction; information of image block using intra coding or inter coding; image block The division mode.
  • Step S540 can be implemented with reference to step S320 in the foregoing, which will not be described in detail here.
  • step S550 the current block is inter-predicted according to the motion information of the sub-block of the current block.
  • step S550 may include: performing inter prediction according to the motion information of the sub-block of the current block in units of the sub-block of the current block.
  • the motion information of the sub-blocks of the current block can be inserted into the current block’s affiliated merges list as ATMVP, and then the complete affine can be constructed as shown in steps S120 to S160 in FIG. 1. mergecandidateslist. Then, the candidate motion vectors in the affiliate candidate list can be used to perform inter prediction on the current block to determine the optimal candidate motion vector.
  • step S550 can be performed with reference to related technologies, which is not limited in the embodiments of the present application.
  • the embodiment of the present application can simplify the operation of the codec by limiting the number of reference frame lists that need to be scanned in the bidirectional prediction process.
  • step S550 when the method of FIG. 5 is applied to the encoding end and the decoding end, respectively, the inter prediction process for the current block described in step S550 may be different.
  • performing inter prediction on the current block may include: determining the prediction block of the current block; and calculating the residual block of the current block according to the original block and the prediction block of the current block.
  • performing inter prediction on the current block may include: determining the prediction block and the residual block of the current block; calculating the current block's current block according to the prediction block and the residual block of the current block Reconstruct the block.
  • FIG. 6 is a schematic structural diagram of a video processing device provided by an embodiment of the present application.
  • the device 60 in FIG. 6 includes: a memory 62 and a processor 64.
  • the memory 62 may be used to store codes.
  • the processor 64 may be used to execute the code stored in the memory to perform the following operations: obtain a reference frame list of the current block, where the reference frame list of the current block includes a first reference frame list and a second reference frame list; A reference frame list of the current block to determine a target reference frame list, the target reference frame list being one of the first reference frame list and the second reference frame list; determined according to the target reference frame list of the current block Time-domain motion vectors of the current block; determining motion information of sub-blocks of the current block according to the time-domain motion vectors; inter-predicting the current block according to motion information of sub-blocks of the current block.
  • the determining the motion information of the sub-block of the current block according to the time domain motion vector includes: determining the corresponding block of the current block in the reference frame according to the time domain motion vector; The corresponding block of the current block in the reference frame determines the motion information of the sub-block of the current block.
  • the determining the target reference frame list according to the reference frame list of the current block includes: if the current frame where the current block is located adopts a low-latency encoding mode, and the co-located frame of the current frame is The first frame in the second reference frame list, determining the second reference frame list as the target reference frame list; and/or if the current frame where the current block is located does not adopt the low-latency encoding mode or all The co-located frame of the current frame is not the first frame in the second reference frame list, and the first reference frame list is determined as the target reference frame list.
  • the first reference frame list may be a forward reference frame list, or may be a reference frame list including the first group of reference frames.
  • the first group of reference frames includes reference frames in time sequence before and after the current frame.
  • the second reference frame list may be a backward reference frame list, or a reference frame list containing a second group of reference frames, the second group of reference frames including the time sequence before the current frame And subsequent reference frames.
  • both the first reference frame list and the second reference frame list may include reference frames before and after the current frame in chronological order.
  • the bidirectional prediction may refer to the first reference frame list and Reference frames with different reference directions are selected in the second reference frame list.
  • the determining the time domain motion vector of the current block according to the target reference frame list of the current block includes: selecting the first candidate motion vector from the current motion vector candidate list; and referencing from the target Look up the reference frame of the first candidate motion vector in the frame list; when the reference frame of the first candidate motion vector is the same as the co-located frame of the current block, determine the first candidate motion vector as The time domain motion vector.
  • the determining the time-domain motion vector of the current block according to the target reference frame list of the current block further includes: when the reference frame of the first candidate motion vector is different from the co-located frame of the current block , The time domain motion vector is determined to be a 0 vector.
  • the inter prediction of the current block includes: determining a prediction block of the current block; and calculating a residual block of the current block according to the original block and the prediction block of the current block.
  • the inter prediction of the current block includes: determining the prediction block and the residual block of the current block; calculating the current block's current block according to the prediction block and the residual block of the current block Reconstruct the block.
  • the inter prediction of the current block according to the motion information of the sub-block of the current block may include: according to the motion information of the sub-block of the current block in the unit of the sub-block of the current block Perform inter prediction.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmit to another website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more available medium integrated servers, data centers, and the like.
  • the available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, digital video disc (DVD)), or semiconductor media (eg, solid state disk (SSD)), etc. .
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

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Abstract

提供一种视频处理方法和装置，该方法包括：获取当前块的参考帧列表，当前块的参考帧列表包括第一参考帧列表和第二参考帧列表；根据当前块的参考帧列表，确定目标参考帧列表，目标参考帧列表为第一参考帧列表和第二参考帧列表之一；根据当前块的目标参考帧列表确定当前块的时域运动矢量；根据时域运动矢量确定当前块的子块的运动信息；根据当前块的子块的运动信息对当前块进行帧间预测。通过限制双向预测过程中需要扫描的参考帧列表的数量，可以简化编解码操作。

Description

视频处理方法和装置
版权申明
本专利文件披露的内容包含受版权保护的材料。该版权为版权所有人所有。版权所有人不反对任何人复制专利与商标局的官方记录和档案中所存在的该专利文件或者该专利披露。
技术领域
本申请涉及视频编解码领域，并且更为具体地，涉及一种视频处理方法和装置。
背景技术
视频编码过程包括帧间预测过程。帧间预测的模式包括merge模式和非merge模式。merge模式下，通常需要先构建merge模式的运动矢量候选列表，并从merge模式的运动矢量候选列表中选取当前块的运动矢量。当前块也可称为当前编码单元(coding unit，CU)。
随着编码技术的发展，帧间预测方式引入了可选/高级时域运动矢量预测(alternative/advanced temporal motion vector prediction，ATMVP)技术。在ATMVP技术中，当前块会被划分成多个子块，并计算子块的运动信息。ATMVP技术旨在引入子块级别的运动矢量预测，以提升视频的整体编码性能。
对于帧间的双向预测模式，利用ATMVP技术寻找当前块的子块的运动信息的过程比较复杂，存在一些冗余操作。
发明内容
本申请提供一种视频处理方法和装置，能够简化编解码操作。
第一方面，提供一种视频处理方法，包括：获取当前块的参考帧列表，所述当前块的参考帧列表包括第一参考帧列表和第二参考帧列表；根据所述当前块的参考帧列表，确定目标参考帧列表，所述目标参考帧列表为所述第一参考帧列表和所述第二参考帧列表之一；根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量；根据所述时域运动矢量确定所述当前块 的子块的运动信息；根据所述当前块的子块的运动信息对所述当前块进行帧间预测。
第二方面，提供一种视频处理装置，包括：存储器，用于存储代码；处理器，用于执行所述存储器中存储的代码，以执行如下操作：获取当前块的参考帧列表，所述当前块的参考帧列表包括第一参考帧列表和第二参考帧列表；根据所述当前块的参考帧列表，确定目标参考帧列表，所述目标参考帧列表为所述第一参考帧列表和所述第二参考帧列表之一；根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量；根据所述时域运动矢量确定所述当前块的子块的运动信息；根据所述当前块的子块的运动信息对所述当前块进行帧间预测。
第三方面，提供一种计算机可读存储介质，其上存储有用于执行第一方面中的方法的指令。
第四方面，提供一种计算机程序产品，包含用于执行第一方面中的方法的指令。
通过限制双向预测过程中的需要扫描的参考帧列表的数量，可以简化编解码操作。
附图说明
图1是构造affine merge candidate list的流程图。
图2是当前块的周围块的示意图。
图3是ATMVP的实现过程的流程图。
图4是当前块的子块的运动信息的获取方式的示例图。
图5是本申请实施例提供的视频处理方法的流程示意图。
图6是本申请实施例提供的视频处理装置的结构示意图。
具体实施方式
本申请可应用于多种视频编码标准，如H.264，高效率视频编码(high efficiency video coding，HEVC)，通用视频编码(versatile video coding，VVC)，音视频编码标准(audio video coding standard，AVS)，AVS+，AVS2以及AVS3等。
视频编码过程主要包括预测、变换、量化、熵编码、环路滤波等部分。 预测是主流视频编码技术的重要组成部分。预测可以分为帧内预测和帧间预测。帧间预测可以通过运动补偿的方式来实现。下面对运动补偿过程进行举例说明。
例如，对于一帧图像，可以先将其划分成一个或多个编码区域。该编码区域也可称为编码树单元(coding tree unit，CTU)。CTU的尺寸例如可以是64×64，也可以是128×128(单位为像素，后文的类似描述均省略单位)。每个CTU可以划分成方形或矩形的图像块。该图像块也可称为编码单元(coding unit，CU)，后文会将待编码的当前CU称为当前块。
在对当前块进行帧间预测时，可以从参考帧(可以是时域附近的已重构帧)中寻找当前块的相似块，作为当前块的预测块。当前块与相似块之间的相对位移称为运动矢量(motion vector，MV)。在参考帧中寻找相似块作为当前块的预测块的过程即为运动补偿。
帧间预测模式包括merge模式和非merge模式。在merge模式中，图像块的运动矢量(motion vector，MV)即为图像块的运动矢量预测(motion vector prediction,MVP)，因此，对于merge模式，在码流中传输MVP的索引及参考帧的索引即可。相比而言，非merge模式不但需要在码流中传输MVP和参考帧的索引，还需要在码流中传输运动矢量差值(motion vector difference，MVD)。
传统的运动矢量采用的是简单的平移模型，即当前块的运动矢量代表的是当前块与参考块之间的相对位移。这种类型的运动矢量难以准确描述视频中的更为复杂的运动情况，如缩放、旋转、透视等。为了能够描述更为复杂的运动情况，相关编解码标准中引入了仿射模型(affine模型)。仿射模型利用当前块的两个或三个控制点(control point，CP)的运动矢量描述当前块的仿射运动场。该两个控制点例如可以是当前块的左上角点和右上角点；该三个控制点例如可以是当前块的左上角点，右上角点和左下角点。
将仿射模型与前文提及的merge模式结合在一起，即形成affine merge模式。普通merge模式的运动矢量候选列表(merge candidate list)中记录的是图像块的MVP，而affine merge模式的运动矢量候选列表(affine merge candidate list)中记录的是控制点运动矢量预测(control point motion vector prediction，CPMVP)。与普通merge模式类似，affine merge模式无需在码流中添加MVD，而是直接将CPMVP作为当前块的CPMV。
当前块的affine mergecandidate list的构造是affine merge模式的重要过程之一。图1示出了affine mergecandidate list(仿射融合候选列表)的一种可能的构造方式。
步骤S110，在当前块的affine mergecandidate list中插入ATMVP。
ATMVP包含的是当前块的子块的运动信息。换句话说，采用ATMVP技术时，affine merge candidate list会插入当前块的子块的运动信息，使得affine merge模式能够在子块这一级别进行运动补偿，从而提升视频的整体编码性能。下文会结合图3，对步骤S110的实现方式进行详细描述，此处暂不详述。
所述运动信息包括以下一种或多种信息的组合：运动矢量；运动矢量差值；参考帧索引值；帧间预测的参考方向；图像块采用帧内编码或帧间编码的信息；图像块的划分模式。
步骤S120，在affine mergecandidate list中插入继承的affine candidates。
例如，如图2所示，可以按照A1->B1->B0->A0->B2的顺序扫描当前块的周围块，将采用affine merge模式的周围块的CPMV作为当前块的affine candidates，插入当前块的affine mergecandidate list。
步骤S130，判断affine mergecandidate list中的affine candidates的数量是否小于预设值。
如果affine mergecandidate list中的affine candidates的数量已达到预设值，结束图1的流程；如果affine mergecandidate list中的affine candidates的数量小于预设值，继续执行步骤S140。
步骤S140，在affine mergecandidate list中插入构造的affine candidates。
例如，可以将当前块的周围块的运动信息进行组合，以构造出新的affine candidates，并将构造生成的affine candidates插入affine mergecandidate list。
步骤S150，判断affine mergecandidate list中的affine candidates的数量是否小于预设值。
如果affine mergecandidate list中的affine candidates的数量已达到预设值，结束图1的流程；如果affine mergecandidate list中的affine candidates的数量小于预设值，继续执行步骤S160。
在步骤S160，在affine mergecandidate list中插入0矢量。
换句话说，使用0矢量填充(padding)affine mergecandidate list，使其 达到预设值。
下面结合图3，对图1中的步骤S110的实现方式进行详细地举例说明。
如图3所示，ATVMP技术的实现方式，即当前块的子块的运动信息的获取方式大致可以分为两步：步骤S310和S320。
在步骤S310，确定当前块的参考帧中的对应块(corresponding block)。
在目前的ATMVP技术中，当前帧(当前块所在的帧)的用于获取运动信息的帧被称为同位帧(co-located picture)。当前帧的同位帧会在slice(条带)初始化时设置。以前向预测为例，第一参考帧列表可以是前向参考帧列表，也可以是包含了第一组参考帧的参考帧列表。所述第一组参考帧中包括了时间顺序在当前帧之前及之后的参考帧。在slice初始化时，通常会将当前块的第一参考帧列表中的第一帧设置为当前帧的同位帧。
当前块在参考帧中的对应块是通过一个时域运动矢量(temp MV)来确定的。因此，为了得到当前块在参考帧中的对应块，需要先推导该时域运动矢量。下面分别以前向预测和双向预测为例，对时域运动矢量的推导过程进行说明。
对于前向预测而言，当前块的参考帧列表(也可称为参考列表或参考图像列表)的个数为1。当前块的参考帧列表可以称为第一参考帧列表(reference list 0)。在一种场景中，该第一参考帧列表可以为前向参考帧列表。当前帧的同位帧通常被设置为第一参考帧列表中的第一帧。在推导时域运动矢量的过程中，可以先扫描当前的运动矢量候选列表(该运动矢量候选列表可以基于空域4个相邻位置的图像块的运动矢量构建)，将该运动矢量候选列表中的第一个候选运动矢量作为初始的时域运动矢量。然后，扫描当前块的第一参考帧列表，如果该第一个候选运动矢量的参考帧与当前帧的同位帧相同，则可以将该第一个候选运动矢量作为时域运动矢量；如果该第一个候选运动矢量的参考帧与当前帧的同位帧不同，则可以将时域运动矢量设置为0矢量，并停止扫描。
对于双向预测而言，当前块的参考帧列表的个数为2，即包括第一参考帧列表(reference list 0)和第二参考帧列表(reference list 1)。其中在一种场景中，第一参考帧列表可以是前向参考帧列表，第二参考帧列表可以是后向参考帧列表。与前向预测类似，在推导时域运动矢量的过程中，可以先扫描当前的运动矢量候选列表，将该运动矢量候选列表中的第一个候选运动矢 量作为初始的时域运动矢量。然后，先扫描当前块的当前参考方向上的一个参考帧列表(可能是第一参考帧列表，也可能是第二参考帧列表)，如果该第一个候选运动矢量的参考帧与当前帧的同位帧相同，则可以将该第一个候选运动矢量作为时域运动矢量；如果该第一个候选运动矢量的参考帧与当前帧的同位帧不同，则继续扫描当前块的另一参考方向上的参考帧列表。同样地，如果第一个候选运动矢量在该另一参考帧列表中的参考帧与当前帧的同位帧相同，则可以将该第一个候选运动矢量作为时域运动矢量；如果该第一个候选运动矢量的参考帧与当前帧的同位帧不同，则可以将时域运动矢量设置为0矢量，并停止扫描。需要注意的是，在另外一些场景中，第一参考帧列表和第二参考帧列表都可以包含时间顺序在当前帧之前及之后的参考帧，所述的双向预测是指从第一参考帧列表和第二参考帧列表中选择了参考方向不同的参考帧。
对于双向预测而言，第一参考帧列表和第二参考帧列表的扫描顺序可以按照如下规则确定：
当当前帧采用的是低时延(low delay)编码模式，且当前帧的同位帧被设置为第二参考帧列表中的第一帧，则先扫描第二参考帧列表；否则，先扫描第一参考帧列表。
其中，当前帧采用低时延(low delay)编码模式可表示当前帧的参考帧在视频序列中的播放顺序均处于当前帧之前；当前帧的同位帧被设置为第二参考帧列表中的第一帧可表示当前帧的第一参考帧列表的第一个slice的量化步长小于第二参考帧列表的第一个slice的量化步长。
在推导出时域运动矢量之后，即可利用该时域运动矢量在参考帧中找到当前块的对应块。
在步骤S320，根据当前块的对应块，获取当前块的子块的运动信息。
如图4所示，可以将当前块划分成多个子块，然后确定子块在对应块中的运动信息。值得注意的是，对于每个子块而言，对应块的运动信息可以由其所在的最小运动信息存储单位确定。
所述运动信息包括以下一种或多种信息的组合：运动矢量；运动矢量差值；参考帧索引值；帧间预测的参考方向；图像块采用帧内编码或帧间编码的信息；图像块的划分模式。
从图3描述的ATMVP的实现过程可以看出，对于双向预测而言，最坏 的情况是：在推导时域运动矢量的过程中，对两个参考帧列表均进行扫描，仍然没有导出符合条件的时域运动矢量，在这种情况下，对于两个参考帧列表的扫描是冗余的。
此外，在双向预测中，如果当前帧的编码模式为低时延模式(low delay B)或随机访问模式(random access)，第一参考帧列表与第二参考帧列表中的参考帧会有一定程度上的重叠，因此，在获取时域运动矢量的过程中，对两个参考帧列表的扫描过程会存在冗余操作。
因此，相关技术针对双向预测提供的时域运动矢量推导方案比较复杂，存在改善的空间。
下面结合图5，对本申请实施例进行详细描述。
图5是本申请实施例提供的视频处理方法的示意性流程图。图5的方法可应用于编码端，也可应用于解码端。
在步骤S510，获取当前块的参考帧列表，当前块的参考帧列表包括第一参考帧列表和第二参考帧列表。
当前块也可称为当前CU。当前块的参考帧列表包括第一参考帧列表和第二参考帧列表，表示当前块要执行的是帧间的双向预测。
可选地，所述第一参考帧列表可以为前向参考帧列表，也可以是包含了第一组参考帧的参考帧列表。所述第一组参考帧中包括了时间顺序在当前帧之前及之后的参考帧。
可选地，所述第二参考帧列表可以为后向参考帧列表，也可以是包含了第二组参考帧的参考帧列表，所述第二组参考帧中包括了时间顺序在当前帧之前及之后的参考帧。
需要注意的是，在一些场景中，第一参考帧列表和第二参考帧列表都可以包含时间顺序在当前帧之前及之后的参考帧，所述的双向预测可以指从第一参考帧列表和第二参考帧列表中选择了参考方向不同的参考帧。
在步骤S520，根据当前块的参考帧列表，确定目标参考帧列表。
目标参考帧列表为第一参考帧列表和第二参考帧列表之一。该目标参考帧列表可以随机选取，也可以按照一定的规则选取。例如，可以按照如下规则选取：如果当前块所在的当前帧采用低延时编码模式、且当前帧的同位帧为第二参考帧列表中的第一帧，将第二参考帧列表确定为目标参考帧列表；和/或如果当前块所在的当前帧未采用低延时编码模式或当前帧的同位帧不 是第二参考帧列表中的第一帧，将第一参考帧列表确定为目标参考帧列表。
在步骤S530，根据当前块的目标参考帧列表确定当前块的时域运动矢量。
在双向预测过程中，本申请实施例根据第一参考帧列表和第二参考帧列表中的一个参考帧列表确定当前块的时域运动矢量。换句话说，无论是否能够从目标参考帧列表中推导出时域运动矢量，在扫描完目标参考帧列表之后，即停止扫描。换句话说，可以仅根据目标参考帧列表确定当前块的时域运动矢量。
举例说明，可以先从当前的运动矢量候选列表(该运动矢量候选列表可以基于空域4个相邻位置的图像块的运动矢量构建)中选取第一个候选运动矢量；从目标参考帧列表中查找第一个候选运动矢量的参考帧；当第一个候选运动矢量的参考帧与当前块的同位帧相同时，可以将第一个候选运动矢量确定为时域运动矢量；当第一个候选运动矢量的参考帧与当前块的同位帧不同时，也停止扫描，而不像图3实施例中描述的那样继续扫描当前块的另一参考帧列表，在这种情况下，可以将0矢量作为当前块的时域运动矢量。
在步骤S540，根据时域运动矢量确定当前块的子块的运动信息。
例如，可以根据时域运动矢量确定当前块在参考帧中的对应块。然后，可以根据当前块在参考帧中的对应块确定当前块的子块的运动信息。所述运动信息包括以下一种或多种信息的组合：运动矢量；运动矢量差值；参考帧索引值；帧间预测的参考方向；图像块采用帧内编码或帧间编码的信息；图像块的划分模式。步骤S540可以参照上文中的步骤S320实现，此处不再详述。
在步骤S550，根据当前块的子块的运动信息对当前块进行帧间预测。
作为一个示例，步骤S550可以包括：以当前块的子块为单位根据当前块的子块的运动信息进行帧间预测。
例如，可以像图1所示的那样，将当前块的子块的运动信息作为ATMVP插入当前块的affine merge candidates list中，然后按照图1中的步骤S120至步骤S160那样，构造出完整的affine merge candidates list。接着，可以利用该affine merge candidates list中的候选运动矢量，对当前块进行帧间预测，以确定最优的候选运动矢量。步骤S550的详细实现方式可以参照相关技术执行，本申请实施例对此并不限定。
本申请实施例通过限制双向预测过程中需要扫描的参考帧列表的数量，可以简化编解码端的操作。
可以理解的是，图5的方法分别应用于编码端和解码端时，步骤S550描述的对当前块的帧间预测过程会有所差异。例如，当图5的方法应用于编码端时，对当前块进行帧间预测可以包括：确定当前块的预测块；根据当前块的原始块和预测块，计算当前块的残差块。又如，当图5的方法应用于解码端时，对当前块进行帧间预测可以包括：确定当前块的预测块和残差块；根据当前块的预测块和残差块，计算当前块的重构块。
上文结合图1至图5，详细描述了本申请的方法实施例，下面结合图6，详细描述本申请的装置实施例。应理解，方法实施例的描述与装置实施例的描述相互对应，因此，未详细描述的部分可以参见前面方法实施例。
图6是本申请实施例提供的视频处理装置的示意性结构图。图6的装置60包括：存储器62和处理器64。
存储器62可用于存储代码。
处理器64可用于执行所述存储器中存储的代码，以执行如下操作：获取当前块的参考帧列表，所述当前块的参考帧列表包括第一参考帧列表和第二参考帧列表；根据所述当前块的参考帧列表，确定目标参考帧列表，所述目标参考帧列表为所述第一参考帧列表和所述第二参考帧列表之一；根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量；根据所述时域运动矢量确定所述当前块的子块的运动信息；根据所述当前块的子块的运动信息对所述当前块进行帧间预测。
可选地，所述根据所述时域运动矢量确定所述当前块的子块的运动信息，包括：根据所述时域运动矢量确定所述当前块在参考帧中的对应块；根据所述当前块在所述参考帧中的对应块确定所述当前块的子块的运动信息。
可选地，所述根据所述当前块的参考帧列表，确定目标参考帧列表，包括：如果所述当前块所在的当前帧采用低延时编码模式、且所述当前帧的同位帧为所述第二参考帧列表中的第一帧，将所述第二参考帧列表确定为所述目标参考帧列表；和/或如果所述当前块所在的当前帧未采用低延时编码模式或所述当前帧的同位帧不是所述第二参考帧列表中的第一帧，将所述第一参考帧列表确定为所述目标参考帧列表。
可选地，所述第一参考帧列表可以为前向参考帧列表，也可以是包含了 第一组参考帧的参考帧列表。所述第一组参考帧中包括了时间顺序在当前帧之前及之后的参考帧。
可选地，所述第二参考帧列表可以为后向参考帧列表，也可以是包含了第二组参考帧的参考帧列表，所述第二组参考帧中包括了时间顺序在当前帧之前及之后的参考帧。
需要注意的是，在一些场景中，第一参考帧列表和第二参考帧列表都可以包含时间顺序在当前帧之前及之后的参考帧，所述的双向预测可以指从第一参考帧列表和第二参考帧列表中选择了参考方向不同的参考帧。
可选地，所述根据当前块的目标参考帧列表确定所述当前块的时域运动矢量，包括：从所述当前的运动矢量候选列表中选取第一个候选运动矢量；从所述目标参考帧列表中查找所述第一个候选运动矢量的参考帧；当所述第一个候选运动矢量的参考帧与所述当前块的同位帧相同时，将所述第一个候选运动矢量确定为所述时域运动矢量。
可选地，所述根据当前块的目标参考帧列表确定所述当前块的时域运动矢量，还包括：当所述第一个候选运动矢量的参考帧与所述当前块的同位帧不同时，将所述时域运动矢量确定为0矢量。
可选地，所述对所述当前块进行帧间预测，包括：确定所述当前块的预测块；根据所述当前块的原始块和预测块，计算所述当前块的残差块。
可选地，所述对所述当前块进行帧间预测，包括：确定所述当前块的预测块和残差块；根据所述当前块的预测块和残差块，计算所述当前块的重构块。
可选地，所述根据所述当前块的子块的运动信息对所述当前块进行帧间预测可以包括：以所述当前块的子块为单位根据所述当前块的子块的运动信息进行帧间预测。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其他任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如， 所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如数字视频光盘(digital video disc，DVD))、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (16)

  1. 一种视频处理方法，其特征在于，包括：
    获取当前块的参考帧列表，所述当前块的参考帧列表包括第一参考帧列表和第二参考帧列表；
    根据所述当前块的参考帧列表，确定目标参考帧列表，所述目标参考帧列表为所述第一参考帧列表和所述第二参考帧列表之一；
    根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量；
    根据所述时域运动矢量确定所述当前块的子块的运动信息；
    根据所述当前块的子块的运动信息对所述当前块进行帧间预测。
  2. 根据权利要求1所述的方法，其特征在于，所述根据所述时域运动矢量确定所述当前块的子块的运动信息，包括：
    根据所述时域运动矢量确定所述当前块在参考帧中的对应块；
    根据所述当前块在所述参考帧中的对应块确定所述当前块的子块的运动信息。
  3. 根据权利要求1或2所述的方法，其特征在于，所述根据所述当前块的参考帧列表，确定目标参考帧列表，包括：
    如果所述当前块所在的当前帧采用低延时编码模式、且所述当前帧的同位帧为所述第二参考帧列表中的第一帧，将所述第二参考帧列表确定为所述目标参考帧列表；和/或
    如果所述当前块所在的当前帧未采用低延时编码模式或所述当前帧的同位帧不是所述第二参考帧列表中的第一帧，将所述第一参考帧列表确定为所述目标参考帧列表。
  4. 根据权利要求1-3中任一项所述的方法，其特征在于，所述根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量，包括：
    从所述当前的运动矢量候选列表中选取第一个候选运动矢量；
    从所述目标参考帧列表中查找所述第一个候选运动矢量的参考帧；
    当所述第一个候选运动矢量的参考帧与所述当前块的同位帧相同时，将所述第一个候选运动矢量确定为所述时域运动矢量。
  5. 根据权利要求4所述的方法，其特征在于，所述根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量，还包括：
    当所述第一个候选运动矢量的参考帧与所述当前块的同位帧不同时，将 所述时域运动矢量确定为0矢量。
  6. 根据权利要求1-5中任一项所述的方法，其特征在于，所述对所述当前块进行帧间预测，包括：
    确定所述当前块的预测块；
    根据所述当前块的原始块和预测块，计算所述当前块的残差块。
  7. 根据权利要求1-5中任一项所述的方法，其特征在于，所述对所述当前块进行帧间预测，包括：
    确定所述当前块的预测块和残差块；
    根据所述当前块的预测块和残差块，计算所述当前块的重构块。
  8. 根据权利要求1-7中任一项所述的方法，其特征在于，所述根据所述当前块的子块的运动信息对所述当前块进行帧间预测，包括：
    以所述当前块的子块为单位根据所述当前块的子块的运动信息进行帧间预测。
  9. 一种视频处理装置，其特征在于，包括：
    存储器，用于存储代码；
    处理器，用于执行所述存储器中存储的代码，以执行如下操作：
    获取当前块的参考帧列表，所述当前块的参考帧列表包括第一参考帧列表和第二参考帧列表；
    根据所述当前块的参考帧列表，确定目标参考帧列表，所述目标参考帧列表为所述第一参考帧列表和所述第二参考帧列表之一；
    根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量；
    根据所述时域运动矢量确定所述当前块的子块的运动信息；
    根据所述当前块的子块的运动信息对所述当前块进行帧间预测。
  10. 根据权利要求9所述的装置，其特征在于，所述根据所述时域运动矢量确定所述当前块的子块的运动信息，包括：
    根据所述时域运动矢量确定所述当前块在参考帧中的对应块；
    根据所述当前块在所述参考帧中的对应块确定所述当前块的子块的运动信息。
  11. 根据权利要求9或10所述的装置，其特征在于，所述根据所述当前块的参考帧列表，确定目标参考帧列表，包括：
    如果所述当前块所在的当前帧采用低延时编码模式、且所述当前帧的同 位帧为所述第二参考帧列表中的第一帧，将所述第二参考帧列表确定为所述目标参考帧列表；和/或
    如果所述当前块所在的当前帧未采用低延时编码模式或所述当前帧的同位帧不是所述第二参考帧列表中的第一帧，将所述第一参考帧列表确定为所述目标参考帧列表。
  12. 根据权利要求9-11中任一项所述的装置，其特征在于，所述根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量，包括：
    从所述当前的运动矢量候选列表中选取第一个候选运动矢量；
    从所述目标参考帧列表中查找所述第一个候选运动矢量的参考帧；
    当所述第一个候选运动矢量的参考帧与所述当前块的同位帧相同时，将所述第一个候选运动矢量确定为所述时域运动矢量。
  13. 根据权利要求12所述的装置，其特征在于，所述根据所述当前块的目标参考帧列表确定所述当前块的时域运动矢量，还包括：
    当所述第一个候选运动矢量的参考帧与所述当前块的同位帧不同时，将所述时域运动矢量确定为0矢量。
  14. 根据权利要求9-13中任一项所述的装置，其特征在于，所述对所述当前块进行帧间预测，包括：
    确定所述当前块的预测块；
    根据所述当前块的原始块和预测块，计算所述当前块的残差块。
  15. 根据权利要求9-13中任一项所述的装置，其特征在于，所述对所述当前块进行帧间预测，包括：
    确定所述当前块的预测块和残差块；
    根据所述当前块的预测块和残差块，计算所述当前块的重构块。
  16. 根据权利要求9-15中任一项所述的装置，其特征在于，所述根据所述当前块的子块的运动信息对所述当前块进行帧间预测，包括：
    以所述当前块的子块为单位根据所述当前块的子块的运动信息进行帧间预测。
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