Friday, May 25, 2012

HEVC / H.265 Text Specification Draft 7 (HEVC DIS) and HM-7.0rc2

The Joint Collaborative Team on Video Coding (JCT-VC) are now developing the next generation of MPEG coding, which, when completed, will be known as H.265, HEVC, "The Next Step for MPEG". This work began in early 2010, and is expected to result in the publication of a finished standard in 2013, 10 years after the publication of MPEG-4. A principal objective of H.265 is to improve coding efficiency, reducing bit rate requirements to half that required for comparable pictures in MPEG-4, at the expense of increased computational complexity. It is aimed at advanced displays and television systems that use progressive scanning and resolutions from 320x240 pixels up to UHDTV with 8K resolution (7680x4320 pixels), so it is aimed at covering the gamut from handheld mobile screens to theater-grade 8K displays, and the systems to produce and transport images for them, plus improved noise performance, dynamic range, and color fidelity.

JCT-VC of ITU-T WP3/16 and ISO/IEC JTC 1/ SC 29/ WG 11 held its ninth meeting during 27 April – 7 May 2012 at the ITU-T premises in Geneva, CH. The primary goals of the meeting were to review the work that was performed in the interim period since the eighth JCT-VC meeting in producing the 6th HEVC Test Model (HM6) software and text and editing the 6th HEVC specification Draft (which was issued as an ISO/IEC Committee Draft – CD), review the results from interim Core Experiments (CEs), review technical input documents, establish the 7th draft of the HEVC specification (to be issued as an ISO/IEC Draft International Standard – DIS) and the seventh version of the HEVC Test Model (HM7), and plan a new set of Core Experiments (CEs) for further investigation of proposed technology.

The JCT-VC produced three particularly important output documents from the meeting: the HEVC Test Model 7 (HM7), the HEVC specification draft 7 a.k.a. Draft International Standard (DIS), and a document specifying common conditions and software reference configurations for HEVC coding experiments. 

The meeting documents can be downloaded at

The latest HEVC or H.265 text specification draft 7 can be downloaded from the link. The Draft 7 of High efficiency video coding addressed:

RQT related issues (#459)
Log2MaxTrafoSize constraint (#348)
log2TrafoWidth1 and log2TrafoHeight1 calculation for NSQT (#458)
non_square_quadtree_enabled_flag (#403)
Wrong 'else if...' for 'if (skip_flag)' in CU syntax (#452)
use_delta_flag[ j ] is not decoded when used_by_curr_pic_flag[ j ] is 1 (#451)
combined_inter_pred_ref_idx does not exist anymore (#448)
Typos in reference picture list combination (#446)
Text cleanup of QP prediction / derivation (#492)
Equation (7-59) and (7-60) for RPS derivation do not match HM6.0 (#445)
Chroma NSRQT fixes (#505,#506)
Missing decoding process for AMP fixed (#361)
Incorporated CBF coding without derivation process (JCTVC-I0152)
Incorporated Unified CBFU and CBFV Coding in RQT (JCTVC-I0332)

The latest HEVC reference software version is HM-7.0rc2

At CES 2012  in Las Vegas LG Electronics showed the "world's largest" 3D Ultra Definition (UD) HDTV. The 3D UD TV measures an incredible 84-inches and features a 3840 x 2160 resolution (4K). HEVC or H.265 is coming at the right time. 

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