JVET-Q0408 On the combination of JCCR and TS [B. Ray, G. Van der Auwera, M. Karczewicz (Qualcomm)]
Current VTM software (VTM-7.0) does not perform encoder search of JCCR in combination with ChromaTS, as only DCT2 combination is checked for JCCR, although VVC WD allows this combination. This contribution proposes two ways to fix this: 1. enabling encoder search of JCCR in combination with ChromaTS (non-normative) 2. Disabling chromaTS and JCCR combination (normative). CTC results on YUV 4:2:0 and YUV 4:4:4 content, for both proposals, over VTM-7.0, are as follows. In version v2, the source code is attached.
CTC results (YUV 4:2:0) – Proposal 1
Config. | Y | U | V | EncT | DecT |
AI | 0.00% | -0.04% | -0.03% | 99% | 98% |
RA | 0.00% | -0.05% | 0.02% | 99% | 98% |
LD | -0.02% | -0.07% | -0.14% | 98% | 97% |
CTC results (YUV 4:4:4) – Proposal 1
Config. | Y | U | V | EncT | DecT |
AI | -0.11% | -0.17% | -0.19% | 100% | 101% |
RA | -0.06% | -0.21% | -0.20% | 100% | 99% |
LD | -0.13% | -0.27% | -0.20% | 99% | 99% |
CTC results (YUV 4:2:0) – Proposal 2
Config. | Y | U | V | EncT | DecT |
AI | 0.00% | 0.01% | 0.00% | 100% | 100% |
RA | 0.00% | -0.04% | 0.03% | 100% | 101% |
LD |
CTC results (YUV 4:4:4) – Proposal 2
Config. | Y | U | V | EncT | DecT |
AI | -0.01% | -0.01% | 0.00% | 100% | 100% |
RA | -0.01% | 0.00% | 0.01% | 101% | 99% |
LD | -0.07% | -0.18% | -0.04% | 100% | 101% |
This is included in JVET-Q0695 – no need to discuss it was identified.