| JCTVC-J0191 Extension of HM7 to Support Additional Chroma Formats [P. Silcock, K. Sharman, N. Saunders, J. Gamei (Sony)]
In this proposal, a model based upon HM7.0 that provides support for 4:2:2, 4:4:4 and 4:0:0 chroma formats is presented. In this model, 4:2:0 coding is also supported and output files for 4:2:0 are reported to match those provided by HM7.0 for the 8 standard test configurations and other non-standard configurations, with encoding/decoding times similar to HM7.0. The changes that have been made to extend HM7.0 to support 4:2:2/4:4:4 are described.
It was noted that there was a prior contribution I0521.
Like I0521, this contribution used non-square transforms.
Compression test results were provided in relation to JM 18.3.
The software was submitted with the contribution.
It was suggested to set up an AHG and have work done to develop an HM software branch to be merged e.g. by the next meeting.
The contribution reviewed the various aspects of the design that required adjustment, and explored multiple approaches to these. Some examples included:
The importance of test material availability was also noted.
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