PIC PIC PIC
Joint Collaborative Team on Video Coding (JCT-VC)
of ITU-T SG16 WP3 and ISO/IEC JTC1/SC29/WG11 Document: JCTVC-K0007
11th Meeting: Shanghai, CN, 10 – 19 October 2012 Title:

JCT-VC AHG report: Support for range extensions (AHG 7)


Status: Input Document to JCT-VC
Purpose: Ad-hoc group report
Author(s):
David Flynn
dflynn@rim.com
Pierre Andrivon pierre.andrivon@technicolor.com
Eduard Francois edouard.francois@crf.canon.fr
Marta Mrak marta.mrak@bbc.co.uk
Ken McCann ken@zetacast.com
Karl Sharman karl.sharman@eu.sony.com
Kazuo Sugimoto sugimoto.kazuo@ak.mitsubishielectric.co.jp
Pankaj Topiwala pankajtva@gmail.com

Source: AHG 7

______________________________

Abstract

This report summarizes the activities of Ad Hoc Group 7 on support for range extensions between the 10th and 11th JCT-VC meetings.

Mandates

The ad hoc group was mandated to:

Matters arising

A number of test sequences were made available according to the BoG recommendations of the previous meeting [1] and uploaded along with documentation of the conversion process to the uni-hannover ftp site:

ftp://hevc@ftp.tnt.uni-hannover.de/testsequences/FrExt-candidate-sequences/

Unfortunately, no additional “native” 4:2:2 sequences were available, and as such, some 4:4:4 sequences were converted to 4:2:2.

A branch of HM-8.0 was made for the release of a combined software model for testing of merits between the J0191 and J0357 approaches. Performance was evaluated against JM 18.4 anchors (See Tables 1 and 2), and further testing by proponents has provided results of various choices.

An issue with RDOQ process under 4:2:2 conditions has been discovered shortly before the meeting causing a strong bias towards chroma.

Table 1: Performance of HM-8.0-ahg7-dev vs JM18.4 with 4:4:4 input
Main
HE10
Y Cb Cr Y Cb Cr
All Intra -14.7% -15.3% -17.0% -17.1% -17.8% -22.5%
Random Access -29.8% -43.4% -40.5% -33.0% -47.3% -47.9%
Low Delay B -35.5% -42.9% -50.9% -38.5% -46.0% -56.1%
Low Delay P -35.5% -42.9% -50.9% -38.5% -46.0% -56.1%

Table 2: Performance of HM-8.0-ahg7-dev vs JM18.4 with 4:2:2 input
Main
HE10
Y Cb Cr Y Cb Cr
All Intra -14.0% -25.2% -28.7% -16.0% -27.8% -32.4%
Random Access -37.2% -41.8% -43.6% -39.4% -46.2% -48.8%
Low Delay B -42.6% -39.9% -41.0% -44.8% -44.4% -46.8%
Low Delay P -38.6% -39.4% -44.7% -40.9% -43.3% -50.0%

Contributions

A number of documents have been contributed, relating to a number of areas:

Recommendations

It is recommended to:

References

[1]   D. Flynn, “Bog report: Extended chroma formats.” JCTVC-J0581, July 2012.

[2]   K. Sharman, N. Saunders, and J. Gamei, “Ahg7: Options present in extended chroma format model.” JCTVC-K0181, Oct. 2012.

[3]   C. Rosewarne and M. Maeda, “Ahg7: Transforms for extended chroma formats.” JCTVC-K0171, Oct. 2012.

[4]   K. Kawamura, “Ahg7: Chroma coding structure/tools in hevc fidelity range extension.” JCTVC-K0192, Oct. 2012.

[5]   R. Joshi, G. V. D. Auwera, J. Sole, and M. Karczewicz, “Ahg7: Comments on 422 and 444 coding tools and software.” JCTVC-K0322, Oct. 2012.

[6]   S. Matsuo, M. Matsumura, H. Fujii, S. Takamura, and A. Shimizu, “Ahg7: Cross-check report of chroma coding structure/tools in hevc fidelity range extension (jctvc-k0192).” JCTVC-K0196, Oct. 2012.

[7]   T. Lin, S. Wang, P. Zhang, and K. Zhou, “Ahg7: Full-chroma (yuv444) dictionary+hybrid dual-coder extension of hevc.” JCTVC-K0133, Oct. 2012.

[8]   P. Zhang, T. Lin, X. Chen, K. Zhou, and X. Jin, “Ahg7: Hm software implementation and source code for jctvc-k0133.” JCTVC-K0134, Oct. 2012.

[9]   K. Kawamura, “Ahg7: On luma-chroma mode support in hevc fidelity range extension.” JCTVC-K0190, Oct. 2012.

[10]   K. Kawamura, “Ahg7: Inter-plane intra coding for residual signals.” JCTVC-K0191, Oct. 2012.

[11]    K. Kawamura, “Ahg7: Adaptive colour-space transformation of residual signals.” JCTVC-K0193, Oct. 2012.

[12]   J. Kim and B.Jeon, “Ahg7: performance of extended chroma mode for non 4:2:0 format.” JCTVC-K0253, Oct. 2012.

[13]   M. Budagavi, “Cross-check of jctvc-k0133 ( dictionary+hybrid dual-coder extension of hevc).” JCTVC-K0329, Oct. 2012.

[14]   S. Matsuo, M. Matsumura, H. Fujii, S. Takamura, and A. Shimizu, “Ahg7: Cross-check report of luma-chroma mode support in hevc fidelity range extension (jctvc-k0190).” JCTVC-K0194, Oct. 2012.

[15]   M. Matsumura, S. Matsuo, H. Fujii, S. Takamura, and A. Shimizu, “Ahg7: Cross-check report of inter-plane intra coding for residual signals (jctvc-k0191).” JCTVC-K0195, Oct. 2012.

[16]   M. Matsumura, S. Matsuo, H. Fujii, S. Takamura, and A. Shimizu, “Ahg7: Cross-check report of adaptive colour-space transformation of residual signals (jctvc-k0193).” JCTVC-K0198, Oct. 2012.

[17]   M. Zhou, “Ahg7: Sample-based angular intra prediction for hevc lossless coding.” JCTVC-K0199, Oct. 2012.

[18]   K. Chono, “Ahg7: Cross-verification report on jctvc-k0199 entitled “sample-based angular intra prediction for hevc lossless coding”.” JCTVC-K0179, Oct. 2012.

[19]   W. Dai, M. Krishnan, and P. Topiwala, “Ahg7: Colour spaces and chroma sampling methods for higher chroma coding.” JCTVC-K0211, Oct. 2012.

[20]   A. Gabriellini and M. Mrak, “Ahg7: On processing 4:2:2 chroma format.” JCTVC-K0302, Oct. 2012.

[21]   R. Cohen, “Ahg7: Cross-verification of jctvc-k0302, on processing 4:2:2 chroma format.” JCTVC-K0312, Oct. 2012.

[22]   S. Wang, T. Lin, and K. Zhou, “Ahg7: Update on full-chroma (yuv444) screen content test sequences of jctvc-h0294.” JCTVC-K0207, Oct. 2012.

[23]   M. Mrak and G. Thomas, “Ahg7: Additional test sequences (computer graphics).” JCTVC-K0296, Oct. 2012.

[24]   R. Cohen and A. Vetro, “Ahg7: The need for screen-content/graphics test material for extended chroma formats.” JCTVC-K0246, Oct. 2012.