International organisation for standardisation organisation internationale de normalisation

19Establishment of ad hoc groups

The ad hoc groups established to progress work on particular subject areas until the next meeting are described in the table below. The discussion list for all of these ad hoc groups will be the main JCT-VC reflector ([e-mail]).

Title and Email Reflector	Chairs	Mtg
JCT-VC project management ([e-mail]) Coordinate overall JCT-VC interim efforts Report on project status to JCT-VC reflector Provide report to next meeting on project coordination status	G. J. Sullivan, J.-R. Ohm (co-chairs)	N
HEVC Draft and Test Model editing ([e-mail]) Produce and finalize JCTVC-C402 HEVC Test Model 1 (HM 1) Encoder Description Produce and finalize JCTVC-C403 HEVC text specification Working Draft 1 Gather and address comments for refinement of these documents Coordinate with the Software development and HM software technical evaluation AhG to address issues relating to mismatches between software and text	T. Wiegand, K. McCann (co-chairs), B. Bross, W.-J. Han, J.-R. Ohm, J. Ridge, S. Sekiguchi, G. J. Sullivan (vice chairs)	N
Software development and HM software technical evaluation ([e-mail]) Coordinate development of the HM software and its distribution to JCTVC members Produce documentation of software usage for distribution with the software Deliver TMuC 0.9 software version and the reference configuration encodings according to JCTVC-C500 for use in common conditions experiments. Edit JCTVC-C500 to reflect configurations required to run the software in "HM mode". Deliver HM 1.0 and corresponding reference configuration encodings according to JCTVC-C500. (HM 1.0 will be a stripped version of TMuC 0.9 wherein tools not included in HM are removed from the codebase.) Coordinate with HEVC Draft and Test Model editing AhG to identify any mismatches between software and text	F. Bossen (chair), D. Flynn, K. Sühring (vice chairs)	N
Slice support development and characterization ([e-mail]) Implement basic slice support (independently-decodable sequences of largest coding units in raster-scan order) into the HM software. Identify issues relating to the draft text description of slice functionality Coordinate the integration of slice support with the software development and HM software technical evaluation ad hoc group Study technical proposals relating to slice structured coding Study the coding efficiency and loss resilience impact of slice-structured coding Identify and discuss additional issues relating to slice-structured coding	R. Sjöberg (chair), Y. Chen, K. Kazui (vice chairs)
Spatial Transforms ([e-mail]) Study the transforms in the HM design, including compression performance, computational complexity, dynamic range, storage requirements, etc. Perform analysis of block transform design and architecture, including software and hardware considerations. Discuss transform-related Core Experiments, and identify potential synergies or incompatibilities related to the tools being tested in the CEs. Report the results and conclusions of these discussions and experiments to the JCT-VC.	P. Topiwala (chair), M. Budagavi, R. Cohen, R. Joshi (vice chairs)	N
In-loop and post-processing filtering ([e-mail]) Study enhancement schemes of in-loop filtering, including de-blocking/de-banding/de-noising filters, and adaptive Wiener-based filters including variants with various inputs, combination of filters Study trade-offs and characteristics of filter designs including complexity and subjective and objective performance Discuss relationships and evaluation procedures for the filtering techniques Identify possibilities for harmonization of enhanced in-loop filtering technologies Study the relationship between in-loop and post-processing filtering	T. Yamakage (chair), K. Chono, Y. J. Chiu, I. S. Chong, M. Narroschke (vice chairs)	N
Coding block structures ([e-mail]) Study techniques of HM relating to coding block structure Characterize the trade-offs involved in coding block structure issues, including complexity, redundancy and compression performance aspects Identify opportunities for harmonization and simplification of coding block structure	K. Panusopone (chair), W.-J. Han, T. K. Tan, T. Wiegand (vice chairs)	N
Reference pictures memory compression ([e-mail]) Study motion compensation memory access bandwidth of HM design Study coding efficiency loss caused by fixed rounding of extended bit depth values for reference picture storage. Study the visual quality impact of reference picture memory compression Study use cases for memory compression techniques Study the appropriate scope of standardization for memory compression Report on conclusions reached	K. Chono (chair), T. Chujoh, C. S. Lim, A. Tabatabai, M. Zhou (vice chairs)	N
Entropy coding ([e-mail]) Study the entropy coding complexity and compression characteristics of CABAC, LCEC, PIPE/V2V, and other entropy coding designs Characterize throughput, memory, silicon area, power requirements, etc. Study parallel context processing, syntax-element partitioning, and other parallelism approaches for entropy coding Study and develop approaches for hardware and software evaluation of entropy coding methods Identify and discuss additional issues on entropy coding	M. Budagavi (chair), G. Martin-Cocher, A. Segall (vice chairs)	N
Entropy slices ([e-mail]) Study entropy slice coding methods Evaluate the compression performance and other characterstics of entropy slices relative to conventional slices Analyze impacts of throughput, latency, and memory bandwidth for entropy slice methods for various architectures Develop and perform experiments evaluating entropy slice methods Identify and discuss additional issues relating to entropy slices	A. Segall (chair) V. Sze, Y.-W. Huang (vice chairs)	N
Video test material selection ([e-mail]) Identify, collect, and make available a variety of video sequence test material Study the coding performance and characteristics of test materials Identify and recommend appropriate test materials and corresponding test conditions for use in HEVC development	T. Suzuki (chair)	N
Complexity assessment ([e-mail]) Investigate measurement criteria to assess the complexity of encoder and decoder algorithmic design elements, including computational complexity, parallelism, memory bandwidth, memory capacity, dynamic range requirements, etc. Identify and recommend tools for algorithmic complexity assessment	D. Alfonso (chair), J. Ridge, X. Wen (vice chairs)	N
Motion compensation interpolation ([e-mail]) Study the coding efficiency and complexity characteristics of proposed interpolation filtering methods Study the potential for using a unified motion compensation interpolation approach for high efficiency and low complexity configurations Draft proposed core experiments relating to motion compensation interpolation Identify and discuss additional issues relating to motion compensation filtering	K. Ugur (chair), E. Alshina, P. Chen, T. Chujoh (vice chairs)	N