Of itu-t sg16 wp3 and iso/iec jtc1/SC29/WG11

SCE4 test number	Method	Proposal documents
Cross-checking documents
1	5.1-test1	Weighted Prediction	JCTVC-O0194 (Nokia, Samsung)	JCTVC-O0210 (Sony)
2	5.2-test1	Gain-Offset model	JCTVC-O0201 (Sharp)	JCTVC-O0241 (Qualcomm)
3	5.2-test2
4	5.3-test1	3D LUT	JCTVC-O0159 (Technicolor)	JCTVC-O0130 (ETRI)
5	5.3-test2			JCTVC-O0261 (Sharp)
6	5.4-test1-model1	Piecewise-linear	JCTVC-O0196 (Sony)	JCTVC-O0242 (Qualcomm)
7	5.4-test2-model1	Piecewise-linear	JCTVC-O0196 (Sony)	JCTVC-O0242 (Qualcomm)

initial reference/anchor: Spatial upsampling of SHM, and fill 2 bits (10) at the two LSB positions

5.1: Applies spatial upsampling with higher precision (omitting scaling step) for bit-depth scalability, and additional results with weighted prediction (from HEVC) as subsequent step for color gamut scalability, WP parameters optimized for each picture. Results are also given for WP without higher accuracy.

Methods 5.2. and 5.4 apply spatial upsampling like the reference/anchor, and other methods of color gamut and bit-depth conversion afterwards

5.2 (gain/offset) should be basically the same as 5.1 (except for the precision of upsampling), but parameters are only optimized for first picture

5.4 uses a piecewise-linear characteristic (2 segments) with adaptation to the first picture (there is a non-CE contribution on picture-wise adaptation JCTVC-O196).

5.3 applies LUT to implement both color gamut and bit-depth scalability, and spatial upsampling to output of LUT operation; results are also provided with spatial upsampling first, and LUT as final step.

LUT has 9x9x9 entries, optimized for entire sequence, encoded in PPS, with a special method of octree coding of LUT entries (about 3-8 kbit depending on sequence).

Results test 1, compared to reference/anchor: