WO2015103747A1 - Motion parameter hole filling - Google Patents
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- WO2015103747A1 WO2015103747A1 PCT/CN2014/070320 CN2014070320W WO2015103747A1 WO 2015103747 A1 WO2015103747 A1 WO 2015103747A1 CN 2014070320 W CN2014070320 W CN 2014070320W WO 2015103747 A1 WO2015103747 A1 WO 2015103747A1
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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
- H04N19/50—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
- H04N19/513—Processing of motion vectors
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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
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/436—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation using parallelised computational arrangements
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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
- H04N19/50—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
- H04N19/553—Motion estimation dealing with occlusions
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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
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
Definitions
- the invention relates generally to Three-Dimensional (3D) video processing.
- the present invention relates to methods for motion parameter hole filling for the sub-PU level inter-view motion prediction.
- 3D video coding is developed for encoding or decoding video data of multiple views simultaneously captured by several cameras. Since all cameras capture the same scene from different viewpoints, multi-view video data contains a large amount of inter-view redundancy. To exploit the inter-view redundancy, additional tools such as sub-PU based inter-view motion prediction (SPIVMP) have been integrated to conventional 3D-HEVC (High Efficiency Video Coding) codec.
- SPIVMP sub-PU based inter-view motion prediction
- the SPIVMP derives motion parameters of each sub-PU from the motion parameters of the corresponding reference block in the reference view. For the reference block that has unavailable motion parameters, one set of temporary motion parameters are stored and updated during SPIVMP process. For each sub-PU, if the reference block of the current sub-PU has available motion parameters, temporary motion parameters is updated with the motion parameters of the reference block. Otherwise, if the reference block does not have available motion parameters, the temporary motion parameters are copied to the current sub-PU. And this process is called the motion parameter hole filling process.
- the motion hole filling process uses temporary motion parameters for an unavailable reference sub-PU (motion hole).
- motion hole To fill the motion hole, SPIVMP process needs to find where the last available reference sub-PU position is. Therefore, the motion parameters of a motion hole are dependent on the sub-PU processing order, which is not friendly to parallel processing.
- ICT3V-G0120 a default motion parameter was proposed to fill the motion hole, which is the motion parameter of the reference block of center sub-PU in current PU. If that motion parameter is unavailable, zero motion vector and zero reference index for both reference picture list 0 and reference picture list 1 (if current slice is B slice) is used as the default motion parameter.
- FIG. 1 is a diagram illustrating the derivation of the default motion parameter.
- one default motion parameter is generated before processing any sub-PU. For each sub-PU within the current PU, if its corresponding reference block does not contain any available motion information, the default motion parameter is used for the sub-PU.
- the default motion parameter is used for motion hole filling and pruning. In this way, motion prediction for each sub-PU can be done in parallel and pruning of other candidates never needs to wait till all sub-PUs are motion predicted.
- the default motion parameter is the motion parameter of the reference block of center sub-PU in current PU as shown in Fig. 1, which is generated as follows:
- nPSW and nPSH are the width and height of the PU
- nSubPsW and nSubPsH are the width and height of the sub-PU.
- nPbW and nPbH specifying the width and the height, respectively, of the current prediction unit
- the motion vector mvLXInterView is set equal to ( 0, 0 ).
- the reference index refldxLXInterView is set equal to -1.
- nSbW and nSbH are derived as:
- the variable ivRefPic is set equal to the picture with Viewldx equal to refViewIdx in the current access unit.
- the derivation process for a temporal inter-view motion vector candidate as specified in subclause H.8.5.3.2.1 1 is invoked with the luma location ( xPb + xBlkCtr*nSbW, yPb + yBlkCtr * nSbH ), the variables nSbW and nSbH, the prediction list indication X, the view order index refViewIdx, and the disparity vector mvDisp as the inputs and the outputs are the flag spPredFlagLX[ xBlkCtr ][ yBlkCtr ], the motion vector spMvLX[ xBlkCtr ][ yBlkCtr ] and the reference index spRefldxLXf xBlkCtr ][ yBlkCtr ].
- variable curAvailableFlag is set equal to ( spRefIdxL0[ xBlkCtr ][ yBlkCtr ]
- curAvailableFlag is equal to 0, the whole decoding process specified in this subclause terminates.
- the variables nSbW and nSbH, the prediction list indication X, the view order index refViewIdx, and the disparity vector mvDisp as the inputs and the outputs are the flag spPredFlagLX[ xBlk ][ yBlk ], the motion vector spMvLX[ xBlk ][ yBlk ] and the reference index spRefIdxLX[ xBlk ][ yBlk ].
- variable curAvailableFlag is set equal to
- SubPbPredFlagLX, SubPbMvLX and SubPbRefldxLX are derived as specified in following:
- SubPbPredFlagLX[ xPb + x ] [ yPb + y ] spPredFlagLX[ x / nSb W ] [ y / nSb W ] (H- 170)
- SubPbMvLX[ xPb + x ] [ yPb + y ] spMvLX[ x / nSb W ] [ y / nSb W ] (H- 171 )
- SubPbRefIdxLX[ xPb + x ][ yPb + y ] spRefIdxLX[ x / nSbW ][ y / nSbW ] (H-172)
- the default motion parameter is the motion parameter of the reference block of one predefined sub-PU in current PU.
- This predefined sub-PU can be the center sub-PU as described above, or it can be another sub-PU.
- a second default motion parameter is used.
- the second default motion parameter is the motion parameter of the reference block of a second predefined sub-PU in current PU. This second predefined sub-PU should not be equal to the first predefined sub-PU.
- the sub-PU temporal inter-view motion vector candidate is set as unavailable.
- the process on how to get the default motion parameter depends on PU size or CU size.
- the process to get the default motion parameter is omitted if PU size is equal to smaller than 8x8.
- the process to get the default motion parameter is always done if PU size is equal to smaller than 8x8.
- an embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein.
- An embodiment of the present invention may also be program codes 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).
- 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 codes may be developed in different programming languages and different format or style.
- the software code may also be compiled for different target platform.
- 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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Abstract
A method of motion parameter hole filling is proposed. To make SPIVMP friendly to parallel processing, one default motion parameter is generated before processing any sub-PU. For each sub-PU within the current PU, if its corresponding reference block does not contain any available motion information, the default motion parameter is used for the sub-PU.
Description
MOTION PARAMETER HOLE FILLING
TECHNICAL FIELD
[0001] The invention relates generally to Three-Dimensional (3D) video processing. In particular, the present invention relates to methods for motion parameter hole filling for the sub-PU level inter-view motion prediction.
BACKGROUND
[0002] 3D video coding is developed for encoding or decoding video data of multiple views simultaneously captured by several cameras. Since all cameras capture the same scene from different viewpoints, multi-view video data contains a large amount of inter-view redundancy. To exploit the inter-view redundancy, additional tools such as sub-PU based inter-view motion prediction (SPIVMP) have been integrated to conventional 3D-HEVC (High Efficiency Video Coding) codec.
[0003]For the detailed information about coding tools in 3D-HEVC, one can refer to the document JCT3V-F1001_v4 which can be found at http://phenix.it- sudparis.eu/jct2/doc_end_user/documents/6_Geneva/wgl l/JCT3 V-F1001-v4.zip. The description for SPIVMP (can also be called as the sub-PU temporal inter-view motion vector candidate) is in the section H.8.5.3.2.16.
[0004] In current 3D-HEVC, the SPIVMP derives motion parameters of each sub-PU from the motion parameters of the corresponding reference block in the reference view. For the reference block that has unavailable motion parameters, one set of temporary motion parameters are stored and updated during SPIVMP process. For each sub-PU, if the reference block of the current sub-PU has available motion parameters, temporary motion parameters is updated with the motion parameters of the reference block. Otherwise, if the reference block does not have available motion parameters, the temporary motion parameters are copied to the current sub-PU. And this process is called the motion parameter hole filling process.
[0005] In the current 3D-HEVC, the motion hole filling process uses temporary motion parameters for an unavailable reference sub-PU (motion hole). To fill the motion hole, SPIVMP process needs to find where the last available reference sub-PU position is. Therefore, the motion parameters of a motion hole are dependent on the sub-PU processing order, which is not friendly to
parallel processing.
[0006] In ICT3V-G0120, a default motion parameter was proposed to fill the motion hole, which is the motion parameter of the reference block of center sub-PU in current PU. If that motion parameter is unavailable, zero motion vector and zero reference index for both reference picture list 0 and reference picture list 1 (if current slice is B slice) is used as the default motion parameter.
[0007] However, because the zero motion vector is not a reasonable default motion parameter, the method proposed in JCT3V-G0120 suffered a BD-rate loss.
[0008] In ICT3V-G0147, a default motion parameter was proposed to fill the motion hole, which is the motion parameter of the reference block of center pixel in current PU. If that motion parameter is unavailable, then the SPIVMP process is terminated, i.e., the sub-PU temporal inter- view motion vector candidate is marked as unavailable.
[0009] However, because the reference block of the center pixel in current PU may be different from any one of the reference blocks of all the sub-PUs, in the worst case, the proposed method in JCT3V-G0147 need to access one more reference block to derive the motion parameter.
SUMMARY
[0010]In light of the previously described problems, it is proposed to use a default motion parameter to fill the motion hole, which is the motion parameter of the reference block of center sub- PU in current PU as shown in Fig. 1. If that motion parameter is unavailable, then the SPIVMP process is terminated, i.e., the sub-PU temporal inter-view motion vector candidate is marked as unavailable. Apparently, the proposed method is a harmonization of JCT3V-G0120 and JCT3V- G0147. Therefore, the drawbacks in both JCT3V-G0120 and JCT3V-G0147 can be avoided.
[0011]Other aspects and features of the invention will become apparent to those with ordinary skill in the art upon review of the following descriptions of specific embodiments.
BRIEF DESCRIPTION OF DRAWINGS
[0012] The invention can be more fully understood by reading the subsequent description and examples with references made to the accompanying drawings, wherein:
[0013]Fig. 1 is a diagram illustrating the derivation of the default motion parameter.
DETAILED DESCRIPTION
[0014]The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
[0015] To make SPIVMP friendly to parallel processing, one default motion parameter is generated before processing any sub-PU. For each sub-PU within the current PU, if its corresponding reference block does not contain any available motion information, the default motion parameter is used for the sub-PU.
[0016] The default motion parameter is used for motion hole filling and pruning. In this way, motion prediction for each sub-PU can be done in parallel and pruning of other candidates never needs to wait till all sub-PUs are motion predicted.
[0017] The default motion parameter is the motion parameter of the reference block of center sub-PU in current PU as shown in Fig. 1, which is generated as follows:
[0018]If the block covering the center pixel ((nPSW/nSubPsW/2)*nSubPsW + nSubPsW/2, (nPSH/nSubPsH/2)*nSubPsH + nSubPsH/2) within the reference block (of the PU) has available motion parameter, the motion parameters of the block is used as the default set of motion parameters. Here, nPSW and nPSH are the width and height of the PU, and nSubPsW and nSubPsH are the width and height of the sub-PU.
[0019] Otherwise, the SPIVMP process is terminated.
[0020] Specifically, the subclause H.8.5.3.2.16 of the draft text JCT3V-F1001_v4 is modified as follows:
H.8.5.3.3 Derivation process for a sub prediction block temporal inter-view motion vector candidate
This process is not invoked when iv_mv_pred_fiag[ nuh_layer_id ] is equal to 0.
Inputs to this process are:
- a luma location ( xPb, yPb ) of the top-left luma sample of the current prediction unit relative to the top-left luma sample of the current picture,
- variables nPbW and nPbH specifying the width and the height, respectively, of the current prediction unit,
- a reference view index refViewIdx.
- a disparity vector mvDisp,
Outputs of this process are:
- the flags availableFlagLXInterView, with X in the range of 0 to 1, inclusive, specifying whether the temporal inter-view motion vector candidate is available,
- the temporal inter- view motion vector candidate mvLXInterView, with X in the range of 0 to 1, inclusive.
- the reference index refldxLXInterView, with X in the range of 0 to 1, inclusive, specifying a reference picture in the reference picture list RefPicListLX,
For X in the range of 0 to 1, inclusive, the following applies:
- The flag availableFlagLXInterView is set equal to 0.
- The motion vector mvLXInterView is set equal to ( 0, 0 ).
- The reference index refldxLXInterView is set equal to -1.
The variables nSbW and nSbH are derived as:
nSbW = nPbW / SubPbSize[ nuh_layer_id ] <= 1 ? nPbW : SubPbSize[ nuh_layer_id ] (H-157) nSbH = nPbH / SubPbSize[ nuh layer id ] <= 1 ? nPbH : SubPbSize[ nuh layer id ] (H-158) The variable ivRefPic is set equal to the picture with Viewldx equal to refViewIdx in the current access unit.
Set yBlkCtr equal to nPbH / nSbH / 2, and xBlkCtr equal to nPbW / nSbW / 2, the following applies:
- For X in the range of 0 to 1, inclusive, the derivation process for a temporal inter-view motion vector candidate as specified in subclause H.8.5.3.2.1 1 is invoked with the luma location ( xPb + xBlkCtr*nSbW, yPb + yBlkCtr * nSbH ), the variables nSbW and nSbH, the prediction list indication X, the view order index refViewIdx, and the disparity vector mvDisp as the inputs and the outputs are the flag spPredFlagLX[ xBlkCtr ][ yBlkCtr ], the motion vector spMvLX[ xBlkCtr ][ yBlkCtr ] and the reference index spRefldxLXf xBlkCtr ][ yBlkCtr ].
- The variable curAvailableFlag is set equal to ( spRefIdxL0[ xBlkCtr ][ yBlkCtr ] | | spRefldxL 1 [ xBlkCtr ][ yBlkCtr ] ).
- If curAvailableFlag is equal to 0, the whole decoding process specified in this subclause terminates.
- Otherwise, For X in the range of 0 to 1, inclusive, the following applies:
- mvLXInterView = spMvLX[ xBlkCtr ][ yBlkCtr ]
- refldxLXInterView = spRefIdxLX[ xBlkCtr ][ yBlkCtr ]
- availableFlagLXInterView = spPredFlagLX[ xBlkCtr ] [ yBlkCtr ]
For yBlk in the range of 0 to ( nPbH / nSbH - 1 ), inclusive, the following applies:
- For xBlk in the range of 0 to ( nPbW / nSbW - 1 ), inclusive, the following applies:
- For X in the range of 0 to 1, inclusive, the derivation process for a temporal inter-view motion vector candidate as specified in subclause H.8.5.3.2.1 1 is invoked with the luma location
( xPb + xBlk*nSbW, yPb + yBlk * nSbH ), the variables nSbW and nSbH, the prediction list indication X, the view order index refViewIdx, and the disparity vector mvDisp as the inputs and the outputs are the flag spPredFlagLX[ xBlk ][ yBlk ], the motion vector spMvLX[ xBlk ][ yBlk ] and the reference index spRefIdxLX[ xBlk ][ yBlk ].
- The variable curAvailableFlag is set equal to
( spRefIdxL0[ xBlk ][ yBlk ] | | spRefldxLl [ xBlk ][ yBlk ] ).
- If the curAvailableFlag is equal to 0, the following applies for X in the range of 0 to 1, inclusive:
spMvLX[ xBlk ] [ yBlk ] = spMvLX[ xBlkCtr ][ yBlkCtr ]
- spRefIdxLX[ xBlk ][ yBlk ] = spRefIdxLX[ xBlkCtr ][ yBlkCtr ]
spPredFlagLX[ xBlk ][ yBlk ] = spPredFlagLX[ xBlkCtr ][ yBlkCtr ]
For use in derivation processes of variables invoked later in the decoding process, the following assignments are made for x = 0.. nPbW - 1 and y = 0.. nPbH - 1 :
- For X in the range of 0 to 1, inclusive, the following applies:
- The variables SubPbPredFlagLX, SubPbMvLX and SubPbRefldxLX are derived as specified in following:
SubPbPredFlagLX[ xPb + x ] [ yPb + y ] = spPredFlagLX[ x / nSb W ] [ y / nSb W ] (H- 170) SubPbMvLX[ xPb + x ] [ yPb + y ] = spMvLX[ x / nSb W ] [ y / nSb W ] (H- 171 ) SubPbRefIdxLX[ xPb + x ][ yPb + y ] = spRefIdxLX[ x / nSbW ][ y / nSbW ] (H-172)
- The derivation process for chroma motion vectors in subclause 8.5.3.2.9 is invoked with SubPbMvLX[ xPb + x ][ yPb + y ] as input and the output is SubPbMvCLX[ xPb + x ][ yPb + y ].
[0021] In another embodiment, the default motion parameter is the motion parameter of the reference block of one predefined sub-PU in current PU. This predefined sub-PU can be the center sub-PU as described above, or it can be another sub-PU.
[0022] In another embodiment, if the motion parameter of the reference block of the predefined sub-PU in current PU is not available, a second default motion parameter is used. The second default motion parameter is the motion parameter of the reference block of a second predefined sub-PU in
current PU. This second predefined sub-PU should not be equal to the first predefined sub-PU.
[0023] In another embodiment, if the motion parameter of the reference block of the first and the second sub-PU in current PU are neither available, then the sub-PU temporal inter-view motion vector candidate is set as unavailable.
[0024] In another embodiment, the process on how to get the default motion parameter depends on PU size or CU size.
[0025] In another embodiment, the process to get the default motion parameter is omitted if PU size is equal to smaller than 8x8.
[0026] In another embodiment, the process to get the default motion parameter is always done if PU size is equal to smaller than 8x8.
[0027] The method described above can be used in a video encoder as well as in a video decoder. Embodiments of the method according to the present invention as described above may be implemented in various hardware, software codes, or a combination of both. For example, an embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein. An embodiment of the present invention may also be program codes to be executed on a Digital Signal Processor (DSP) to perform the processing described herein. 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 codes may be developed in different programming languages and different format or style. The software code may also be compiled for different target platform. However, 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.
[0028] The invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described examples are to be considered in all respects only as illustrative and not restrictive. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Claims
1. A method to perform the motion parameter hole filling.
2. The method as claimed in claim 1, wherein the motion parameter hole filling is used when the reference block of a sub-PU has no available motion parameter.
3. The method as claimed in claim 1, wherein a default motion parameter is used to fill the motion parameter hole.
4. The method as claimed in claim 3, wherein the default motion parameter is the motion parameter of the reference block of one of the sub-PU in current PU.
5. The method as claimed in claim 4, wherein the default motion parameter is the motion parameter of the reference block of the center sub-PU in current PU.
6. The method as claimed in claim 4, if the motion parameter of the reference block of the center sub-PU in current PU is not available, then the sub-PU temporal inter-view motion vector candidate is set as unavailable.
7. The method as claimed in claim 3, wherein the default motion parameter is also used as the representative motion parameter for pruning with other merge candidates in 3D-HEVC.
8. The method as claimed in claim 3, claim 4, claim 5, and claim 6 is shown in detail in the previous detailed description of the invention.
9. The method as claimed in 4, the center sub-PU could be the sub-PU located at the above- right, above-left, below-right, or below-left of the center point in the current PU.
10. The method as claimed in claim 1, when a sub-PU doesn't contain an available MV, it is replaced by the default motion parameter.
11. The method as claimed in claim 7, wherein the pruning process is depending on the sub- PU size. For example, when the sub-PU size is smaller than the PU size, the pruning process can be disabled.
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Cited By (1)
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| WO2020114404A1 (en) * | 2018-12-03 | 2020-06-11 | Beijing Bytedance Network Technology Co., Ltd. | Pruning method in different prediction mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020114404A1 (en) * | 2018-12-03 | 2020-06-11 | Beijing Bytedance Network Technology Co., Ltd. | Pruning method in different prediction mode |
| US11284068B2 (en) | 2018-12-03 | 2022-03-22 | Beijing Bytedance Network Technology Co., Ltd. | Indication method of maximum number of candidates |
| US11412212B2 (en) | 2018-12-03 | 2022-08-09 | Beijing Bytedance Network Technology Co., Ltd. | Partial pruning method for inter prediction |
| US11856185B2 (en) | 2018-12-03 | 2023-12-26 | Beijing Bytedance Network Technology Co., Ltd | Pruning method in different prediction mode |
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