| JCTVC-O0008 JCT-VC AHG report: Screen content coding (AHG8) [H. Yu, R. Cohen, A. Duenas, D.-K. Kwon, T. Lin, J. Xu]
Many emails talked about the issues in reporting the overall compression performance by various measures for the lossless coding case. The test conditions for RCE2 and RCE3 were discussed and finalized jointly by the participants of RCE2 and RCE3 and AHG8. Overall, these discussions, suggestions, and comments helped the finalization of the test materials, test conditions, and test result report template for RCE2 and RCE3.
Due to the difference in content characteristics, video format, sequence length, etc., the average bit rate saving and the average compression ratio that are calculated in the Excel template have created some confusions. After some extensive discussions, min, max, and overall compression ratio were added to the test result template. A bar graph showing results for every sequence was also found to be useful for visualization purposes. To better address the issue, experts also suggested creating sub-categories, based on the key video and visual parameters, for the existing and future test sequences. This is still an on-going discussion. Perhaps, calculating compression ratio gain for each sequence and then taking the average of these sequence based compression ratio gain is also something helpful.
A few changes were made to the test sequences again this time. Per the discussion in the last meeting in Vienna, some of the 4:4:4 screen content test sequences have been put into a separate “Optional” group. Furthermore, the computer animated content, such as VenueVue, sc_viking, and sc_viking have been grouped into an “Animation” group. See the complete list of the test sequences in groups in the table in the AHG report.
It was commented that the coding characteristics of the animation material were similar to camera-capture video.
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