Organisation internationale de normalisation

Related contributions

JVT-Z036 [A. Segall (Sharp)] On the requirements for bit-depth and chroma format scalability

This document discusses the requirements for bit-depth scalability within the context of consumer applications. Current trends in display technology are the focus, and it is asserted that these trends motivate the need for higher bit-depth formats within consumer devices. Thus, it is proposed that development of any bit-depth scalable system should consider these applications.
JVT-Z039 [S. Liu, A. Vetro (MERL)] Requirements for bit-depth scalability

This document considers a new application scenario for bit-depth scalable coding in which receiver-side editing of a high dynamic range video is desired. Requirements for bit-depth scalable coding are described and preliminary results that aim to demonstrate the benefits of higher-bit depth video at the receiver are shown.

JVT-Z045-Q (Late Prop 2.2/3.1) [Y. Yu, S. Gordon, M. Yang (Broadcom)] Bit depth SVC with a prediction filter (registered after the AHG report was written)

This document describes research work on bit depth SVC. By applying a filter to the reconstructed image from the lower layer, an average of 4.4% BDBR, or an average of 0.15 dB BDPSNR, can reportedly be achieved at the 10 bit top layer for "Viper" sequences. Higher gain is reportedly seen on input sequences with normal lighting conditions. (One sequence had a reported benefit exceeding 10%.)

Two liaison statements related to bit-depth and chroma format scalability had been sent to our MPEG parent body: M15209 from SMPTE and M15215 from DVD Forum.
The AhG recommended

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  To review related contributions during the meeting
  
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  To continue the study of bit-depth and chroma format scalability
  
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  To continue evaluating test material
  

2.5.1.1.6JVT-Z005 (Admin) [J. Ridge, M. Karczewicz] AHG Report: FGS applications and design simplification

At the Shenzhen meeting, the JVT established the FGS applications and design simplification AHG activity with the following mandates:

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  Identify applications that may require FGS functionality and their characteristics.
  
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  Determine to what extent new coding tools are needed to achieve the functionality.
  
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  Define experiments and test conditions relating to FGS technology.
  
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  Coordinate with JSVM software effort to align JSVM software with current design.
  
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  Explore simplification of FGS tool design.
  

No contributions were submitted to this meeting on the subject matter of this AHG.

The main questions asked during the last couple of meetings did not relate to AR-FGS design but rather to its applicability, specifically regarding:

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  Importance of conversational applications for mobile devices.
  
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  Influence of high variations of bits per frame on delay in OFDMA based networks.
  

The AHG report suggested that the best forums to answer these questions are 3GPP and 3GPP2. Hence it was suggested to consider sending liaison letters to these forums requesting their comments. Alternatively since some of JVT participants are also active members of 3GPP/PP2 and it was believed that SVC issues would be discussed in the upcoming 3GPP and 3GPP2 meetings, such that we may use the results of those discussions as input to decide on needs for future work in this area.

2.5.1.1.7JVT-Z006 (Admin) [A. Vetro, P. Pandit] AHG Report: MVC high-level syntax & buffer management

At the Shenzhen meeting, the JVT established the AhG on MVC high-level syntax & buffering, with the following mandates:

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  Discuss high-level syntax for MVC including NAL unit type, NAL unit header extension, SPS extensions, slice layer, and integration with SVC syntax.
  
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  Discuss reference picture management to enable simultaneous picture output of different views and to facilitate parallel processing.
  
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  Discuss issues related to HRD.
  
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  Propose refined syntax and decoding processes for JMVM.
  

The editors were reported to have made several improvements to the JD text related to high level syntax.

A contribution related to the decoding process and HRD for MVC can be found in

JVT-Z024 [A. Vetro (MERL), P. Pandit (Thomson), H. Kimata (NTT), A. Smolic (HHI), Y.-K. Wang (Nokia), C. Ying (Tech. U. Tampere)] MVC decoding process and HRD design

The AhG on MVC high-level syntax & buffering recommended discussing the issues related to HRD and making any necessary revisions to the MVC text.

2.5.1.1.8JVT-Z007 (Admin) [H. Kimata, A. Smolic, P. Pandit, A. Vetro, Y. Chen] AHG Report: MVC JD & JMVM text & software

At the Shenzhen meeting, the JVT established the AhG on JMVM and JD text editing and software, with the following mandates:

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  Collect comments on the draft, perform necessary editing, and upload the final document by the deadline.
  
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  Maintain JMVM and JD document and collect comments on the text until the next meeting.
  
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  Coordinate JMVM software integration
  
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  Coordinate the bug-fixing process for the JMVM software
  
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  Maintain the JMVM software manual
  

The JMVM6 and JD5 were submitted to the JVT as JVT-Y207 and JVT-Y209, respectively. The JD text included a minor syntax change regarding view dependency as described in JVT-Y061. The JMVM included the following updates:

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  JVT-Y033: IC bug fix
  
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  JVT-Y058: motion skip bug fixes
  
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  JVT-Y042/Y053: single loop decoding
  

Several other editorial improvements and clarifications were reported to have also been made to the JD and JMVM text, including:

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  Better alignment with the latest SVC specification
  
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  Clean up the decoding process with regard to IC (intensity compensation – including the adopted fix in JVT-Y033)
  

Some minor editorial revisions to the JMVM were reported to have been received regarding the IC tool since the final document was uploaded and were requested to be considered as editor’s input to the meeting (provided as an attachment to the ad hoc report).

The JMVM 6 software was delivered to the group on November 30th, 2007. This release contained the addition of a motion skip flag in slice header, simplification B- and P-Skip modes on illumination compensation, sending multiple GDVs (global disparity vectors) in the case of multiple inter-view references, SPS (sequence parameter set) simplification, single loop decoding, and some software improvements.
Some software issues that still need to be addressed were reported as:

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  Fix software for compile errors for gcc 3.4+ version.
  
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  Remove all compilation warnings.
  
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  Output order of views is not sequential or parallel (it is on an as ready basis).
  
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  Prepare validation scripts (work in progress).
  
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  Provide support GOPsize=1 (with motion skip & IC).
  
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  Trace file support for arbitrary view_id assignments.
  

The AhG on JMVM and JD text editing recommended:

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  To consider the editor’s input (provided as an attachment to the ad hoc report) in preparing future versions of the JMVM and JD.
  
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  To discuss the issues in the current version of the software as mentioned above.
  
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  To improve the manual created for the JMVM software.
  
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  To follow the same software integration guidelines present in JSVM (repeated below).
  

In order to improve the whole software integration process, the software integration guidelines and rules are as follows:

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  The integrated software shall compile without warnings when using the provided VC6 and, VS .NET workspaces, as well as Linux makefiles.
  
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  Do not use variable declarations inside the header of for-loops (as the scope for for-loops is not correctly supported with all compilers).
  
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  Follow the coding style of the JMVM software. Use 2 (two) spaces for indentation, no tabs.
  
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  Re-use code and integrate functionality as possible. Try to avoid redundant code.
  
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  Do not change the meaning of existing input parameters, but rather define new ones if necessary (and applicable).
  
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  Make sure that new parameters have meaningful default values. Tools should not be switched on by default (if not decided different by the JVT).
  
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  Do not re-structure the output of the compiled binaries (if not decided different by the JVT).
  
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  Please change the JMVM version number macro (i.e. "_JMVM_VERSION_":) located in the file "CommonDefs.h" to be inline with your integration tag.
  

Reference to CVS repository

[CVS] host address: garcon.ient.rwth-aachen.de

user name: jvtuser password: jvt.Amd.2

authentication: pserver path: /cvs/jvt module name: jmvm or jmvm_red
jmvm_red does not check out certain old folders related to SVC.

2.5.1.1.9JVT-Z008 (Admin) [P. Pandit, H. Kimata, S. Cho, K. Müller] AHG Report: MVC RRU and mixed-resolution view coding

Mandates

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  Investigate approaches for enhancing MVC coding efficiency using spatial downsampling
  
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  Evaluate the complexity of such methods
  
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  Investigate the relationship between downsampling approaches and view interpolation
  
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  Investigate low-complexity methods for mobile stereoscopic 3DTV applications
  

No emails had been exchanged on this topic on the reflector.

There were three contributions to this meeting that were noted to relate to this AhG, as follows:

JVT-Z023 [S. Cho, N. Hur, J. Kim, S.-I. Lee (ETRI)] Coding eff of stereoscopic video coding using residual downsampling

JVT-Z026 [Y. Chen, Y.-K. Wang, S. Liu, M. M. Hannuksela, H. Li (Nokia)] On asymmetric MVC

JVT-Z034 [S. Cho, B. Lee, N. Hur, J. Kim, S.-I. Lee (ETRI)] Prelim subjective test results for mixed resolution stereo video coding

The AHG recommended to review the related contributions during the meeting.

2.5.1.1.10JVT-Z009 (Admin) [P. Pandit, H. S. Koo] AHG Report: MVC JMVM coding tools

The JMVM coding tools AhG had been established with the following mandates:

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  Investigate simplification and improvement of current JMVM coding tools (IC and motion skip)
  
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  Investigate techniques for single loop decoding to reduce complexity starting with motion skip
  

No relevant email had been exchanged on the reflector during the interim period since the last meeting.

The following contributions were noted to relate to the AhG:

JVT-Z021 [S. Lin, S. Gao, L. Xiong (Huawei), H. Yang, Y. Chang, J. Huo (Xidian University)] CE1: Fine Motion Matching for Motion Skip Mode in MVC

JVT-Z029 [G. Zhu, X. Xu, P. Yang and Y. He (Tsinghua U.)] MVC inter-view skip mode using depth information JVT-Z030 [Y. S. Ho, K. J. Oh, C. Lee (GIST)] Regional disparity derivation for MVC motion skip mode

JVT-Z031 [J. H. Park, B.H. Choi (KETI)] MVC motion skip mode with residual pred

JVT-Z032 [J. H. Park, B.H. Choi (KETI)] Clarification of motion_skip_enable_flag
The AhG recommended to discuss the related contributions at the meeting.