WO2007080033A1 - Method and apparatus for constructing reference picture lists for scalable video - Google Patents

Method and apparatus for constructing reference picture lists for scalable video Download PDF

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Publication number
WO2007080033A1
WO2007080033A1 PCT/EP2006/069291 EP2006069291W WO2007080033A1 WO 2007080033 A1 WO2007080033 A1 WO 2007080033A1 EP 2006069291 W EP2006069291 W EP 2006069291W WO 2007080033 A1 WO2007080033 A1 WO 2007080033A1
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layer
list
picture
reference pictures
pictures
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English (en)
French (fr)
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Ying Chen
Edouard Francois
Kai Xie
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Thomson Licensing SAS
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Thomson Licensing SAS
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Priority to EP06819908A priority Critical patent/EP1972142B1/en
Priority to US12/087,553 priority patent/US8611412B2/en
Priority to JP2008548955A priority patent/JP5008094B2/ja
Priority to DE602006007179T priority patent/DE602006007179D1/de
Priority to CN2006800505175A priority patent/CN101356822B/zh
Publication of WO2007080033A1 publication Critical patent/WO2007080033A1/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
    • H04N19/50—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
    • H04N19/573—Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
    • 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
    • H04N19/169—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
    • H04N19/172—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
    • 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
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H04N19/31—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability in the temporal domain
    • 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
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
    • H04N19/33—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability in the spatial domain
    • 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
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
    • 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
    • H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
    • H04N19/895—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder in combination with error concealment

Definitions

  • This invention relates to a method and an apparatus for constructing reference picture lists for the spatial enhancement layer of scalable video.
  • pictures can be intra-coded (I-frame), predicted (P-frame) or bi-directionally predicted (B-frames) .
  • Prediction of P- and B-frames is based on previously encoded/decoded reference frames, and therefore reference picture lists are provided: P-frames have one list (listO), and B-frames have two lists (listO, listl). Since reference pictures are required for decoding other pictures, they are stored after their own decoding.
  • SVC provides reference picture list reordering (RPLR) .
  • RPLR reference picture list reordering
  • SVC spatialally scalable video coding
  • BL base layer
  • EL enhancement layers
  • EL UPDATE has just been removed from SVC, i.e. the EL has also hierarchical B-picture structure and temporally has very close syntax as the BL 1 .
  • EL reference picture list construction initialisation or RPLR
  • RPLR initialisation or RPLR
  • JSVM 2 addresses forced RPLR commands to specify the real reference picture lists, rather than just utilize the default reference picture list construction process defined in chapter 8.2.4.2 "Initialisation process for reference picture lists" of the AVC 3 specification and 8.2.4.2 of SVC working draft (WD).
  • BL frames with picture order count (POC) 2, 6, 10, 14, 18, 22, 26, 30 in the first GOP are in the highest temporal level and have the same frame_num, since they are coded with nal_ref_idc equal to 0 successively.
  • POC numbers correspond to the display order of the pictures, ie.
  • the RPLR commands for EL and BL of each frame/picture with POC 2(2m+l) are different.
  • the BL reference picture lists and the EL reference picture lists - that is: ref_idx_lx of the EL frame and the ref_idx_lx of BL frame corresponding to input frames with the same POC (or same display time) if these two values are the same - need to be matched.
  • Pictures are commonly also referred to as frames.
  • Fig.2 inter-layer prediction of reference picture lists.
  • the following example (cf. Fig.l) shows first conventional encoding/decoding.
  • the base layer frame rate is 15Hz and the enhancement layer frame rate is 30Hz.
  • GOP (group-of- pictures) size is equal to 16.
  • RefPicListO is ⁇ 4,0 ⁇ and RefPicListl is ⁇ 8,12,16 ⁇ , see Fig.l: frame 6 has frames 0 and 4 as possible references (ie. pictures of lower temporal level) that are previously displayed
  • POC 6
  • the RPLR commands for list 0 (BL) are:
  • the RPLR commands for list 1 (BL) are:
  • the RPLR commands for list 0 (EL) are:
  • the RPLR commands for list 1 (EL) are:
  • the solution according to the invention is to predict enhancement layer reference picture lists from the base layer reference picture lists.
  • the reference picture lists construction is made simpler by referring to POC values instead of referring to frame num values, and bits are saved.
  • a flag is introduced into the slice header to indicate such prediction. The flag needs only a simple reference picture list construction process for the spatial enhancement layer.
  • a method for encoding video pictures with a first, spatially lower layer or BL, and at least one second, spatially higher layer or EL, wherein frames are predicted or bi-directionally predicted from reference frames comprises indicating the reference frames for the second layer by referring to the reference frames for the first layer.
  • the method can be further specified in that an indication or flag is included in the signal, indicating that the second layer inherits the reference picture list of the f irst layer .
  • a method for decoding video pictures with a first, spatially lower layer or BL and at least one second, spatially higher layer or EL, wherein frames are predicted or bi-directionally predicted from reference frames comprises determining the reference frames for the second layer by evaluating the reference frame lists of the first layer.
  • the method for decoding can be further specified in that an indication is detected during decoding, wherein said determining the reference frames for the second layer is performed only upon said detection.
  • the methods for encoding or decoding can be further specified in that the indication refers to a slice of a picture .
  • the method for decoding can be further specified in that after a data loss detection a lost reference picture list of the spatially higher layer is reconstructed from a reference picture list of the spatially lower layer.
  • a corresponding apparatus for encoding video comprises means for performing said method for encoding.
  • a corresponding apparatus for decoding video comprises means for performing said method for decoding.
  • a corresponding video signal includes a first, spatially lower layer or BL and at least one second, spatially higher layer or EL including predicted and/or bi-directionally predicted frames and indications of respective reference frames, wherein the indication of the reference frames for the second layer pictures indicates that the reference frames for the first layer pictures are to be reused.
  • the video signal can be further specified in that the indication refers to a slice of a picture.
  • a solution for the spatial enhancement layer RPLR commands is provided.
  • a flag is inserted into the slice header syntax (as defined in subclause G.7.3.3 of JVT-Q201 1 ) , and a new processing method is introduced. It generates the sizes of the reference picture lists and then the reference picture lists based on the base layer reference picture lists, and if the flag is set to "true", the RPLR commands as specified in subclause G.8.2.4.3 "Reordering process for reference picture lists" of JVT-Q201 1 are not used. Thus, they can be skipped, so that the amount of data to be transmitted is reduced and processing at the encoder and at the decoder is simplified.
  • the JSVM decoder will easily be able to construct the reference picture lists which are supposed to be provided by RPLR commands.
  • the JSVM decoder provides a default initialisation process for reference picture lists and this default process corresponds to the base layer reference picture lists which are generated by necessary RPLR commands, the decoding process later, as defined in G.8.2.4.2.1, will be the same as the BL.
  • the syntax element temporal_level of the picture is equal to or less than the syntax element temporal_level of the current picture.
  • the EL has to adjust its reference picture lists by using RPLR just based on the BL reference picture lists, although we already know the effect of the RPLR.
  • the proposed new solution is a better way which provides the same reference picture lists, and same PSNR, but saves the bits for RPLR and processing time and effort. If each frame is coded in many slices, the advantage increases. The more slices a frame has, the more bits and processing effort are saved.
  • the proposed reference picture list construction method can be implemented exemplarily in JVT by a small syntax modification, as shown in Tab.3 which shows a slice header in scalable extension.
  • ref_pic_list_inherit_flag will only be used for P- and B-slices of the EL (EP and EB slices) .
  • ref_j?ic_list_inherit_flag 0 specifies that the num ref idx active override flag, num ref idx 10 active minusl, num ref idx 11 active minusl and ref pic list reordering () syntax will be written and their related decoding processes are in effect.
  • ref_j?ic_list_inherit_flag 1 specifies that the num ref idx active override flag, num ref idx 10 active minusl, num ref idx 11 active minusl and ref pic list reordering () syntax will not be written, num ref idx 10 active minusl and num_ref_idx_ll_active_minusl of the current slice will be the same as the values of lower spatial layer slices, and the new reference picture lists construction process will be invoked to replace the initialisation process for reference picture lists and possibly the RPLR process.
  • Lx B ⁇ fo, fi, ..., f n ⁇ and we need to construct the ordered list_X of the enhancement layer Lx E .
  • L E the candidate enhancement layer list L E that will be used to compose the reference picture list of the current enhancement layer slice.
  • L E is composed by items in the short term list and long term list.
  • the process for generation of Lx E (which is initialized as NULL) is described as following:
  • the syntax introduced here can also be extended to picture adaptive frame field (PAFF) coding.
  • PAFF picture adaptive frame field
  • Lx B ⁇ fo, fi, ⁇ -, f n ⁇ t and we need to construct the ordered EL list_X Lx E .
  • L E the candidate EL list L E that will be used to compose the reference picture list of the current EL slice.
  • L E is composed by the fields that generated from the short term list and long term list. The process for generation of Lx E is described as following:
  • Lx E , Lx B and L E are fields.
  • the proposed reference picture lists construction process can also be used to construct the reference picture lists for a lost packet of the spatial EL (error concealment) .
  • a BLSkip error concealment method is introduced into JSVM and gives the best performance among the proposed methods. This method can benefit from the corresponding BL motion information if the spatial EL packet is lost.
  • the method also works well for multiple reference cases, because the current JSVM decoder provides a default way to match the EL reference picture lists with the BL, and actually the EL does not use RPLR like the BL.
  • RPLR RPLR
  • the later JSVM version needs to generate virtual RPLR commands for the lost packet of the spatial EL. But as discussed above, the RPLR commands of the different spatial layers can be different, and it is not straight-forward to predict the lost EL RPLR commands based on the received BL RPLR commands, because the kernel relationship between the two layer reference picture lists is based on POC numbers.
  • the new reference picture list construction method it is easy to guarantee that the reference picture lists constructed for the lost spatial enhancement layer packet match the corresponding base layer reference picture lists, so as to provide good performance also for BLSkip error concealment.
  • the invention can be used in video encoding and/or video decoding. It is most advantageous for spatially scalable video, particularly if the base layer has a different temporal resolution as the enhancement layer or layers.

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
PCT/EP2006/069291 2006-01-10 2006-12-05 Method and apparatus for constructing reference picture lists for scalable video Ceased WO2007080033A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP06819908A EP1972142B1 (en) 2006-01-10 2006-12-05 Method and apparatus for constructing reference picture lists for scalable video coding svc.
US12/087,553 US8611412B2 (en) 2006-01-10 2006-12-05 Method and apparatus for constructing reference picture lists for scalable video
JP2008548955A JP5008094B2 (ja) 2006-01-10 2006-12-05 スケーラブル・ビデオ用参照ピクチャ・リストを構築するための方法及び装置
DE602006007179T DE602006007179D1 (de) 2006-01-10 2006-12-05 Verfahren und vorrichtung zum konstruieren von referenz-bildlisten für skalierbares video svc.
CN2006800505175A CN101356822B (zh) 2006-01-10 2006-12-05 用于构造可伸缩视频的参考图像列表的方法和设备

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EP06300020.2 2006-01-10
EP06300020A EP1806930A1 (en) 2006-01-10 2006-01-10 Method and apparatus for constructing reference picture lists for scalable video

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