| Subtest 1: Maximum palette size
Tester: Qualcomm, JCTVC-S0037
Crosschecker: InterDigital (JCTVC-S0271)
Maximum palette sizes of 15, 47, and 63 were tested (by setting the macro MAX_PLT_SIZE to 15, 47, and 63, respectively in SCM-2.0), relative to the current maximum of 32.
The results were tabulated in the CE summaryreport. Loss was observed when reducing the palette size, but little or no gain was observed by increasing it.
The spec uses truncated unary coding of CU-level palette size, which depends on the decoder knowing the maximum possible palette size. It was remarked that the truncation seems unnecessary. Hitting the maximum size also truncates the palette prediction syntax, which may save some bits and parsing effort.
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