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14th Meeting: Geneva, March 2019 2019-03-12 08:51
CE7: Joint coding of chrominance residuals (CE7-1)
Authors: Jani Lainema Nokia
Abstract
This document provides results for core experiment CE7-1 which was set up to study effectiveness of joint coding of chrominance residuals.
Meeting Notes
JVET-N0054 CE7: Joint coding of chrominance residuals (CE7-1) [J. Lainema (Nokia)]

This test measures performance of joint Cb-Cr coding mode proposed in JVET-M0305. One bin indicator is signalled in the bitstream to enable the mode. In the case the mode is enabled a joint residual signal is coded in the bitstream. On the decoder side the joint residual is used for Cb component and a negative version of the residual is applied for Cr.

Signalling of the mode is expected to follow the syntax and semantics given below:

residual_coding( x0, y0, log2TbWidth, log2TbHeight, cIdx ) {

Descriptor

if( cIdx == 2 && tu_cbf_cb[ x0 ][ y0 ] ) {

tu_cb_cr_joint_residual[ x0 ][ y0 ]

ae(v)

if( tu_cb_cr_joint_residual [ x0 ][ y0 ] ) {

return

}

…

tu_cb_cr_joint_residual[ x0 ][ y0 ] specifies whether indicated Cb residual is used to derive both Cb and Cr residuals. The array indices x0, y0 specify the location ( x0, y0 ) of the top-left luma sample of the considered transform block relative to the top-left luma sample of the picture. tu_cb_cr_joint_residual[ x0 ][ y0 ] equal to 1 specifies that the indicated Cb residual is used to derive the Cr residual. tu_cb_cr_joint_residual[ x0 ][ y0 ] equal to 0 specifies that Cr residual may be present in the bitstream depending on other syntax elements. When tu_cb_cr_joint_residual[ x0 ][ y0 ] is not present, it is inferred to be equal to 0.

This test measures performance of joint Cb-Cr coding mode proposed in JVET-M0305. One bin indicator is signalled in the bitstream to enable the mode. In the case the mode is enabled a joint residual signal is coded in the bitstream. On the decoder side the joint residual is used for Cb component and a negative version of the residual is applied for Cr.

Signalling of the mode is expected to follow the syntax and semantics given below:

residual_coding( x0, y0, log2TbWidth, log2TbHeight, cIdx ) {

Descriptor

if( cIdx == 2 && tu_cbf_cb[ x0 ][ y0 ] ) {

tu_cb_cr_joint_residual[ x0 ][ y0 ]

ae(v)

if( tu_cb_cr_joint_residual [ x0 ][ y0 ] ) {

return

}

…

tu_cb_cr_joint_residual[ x0 ][ y0 ] specifies whether indicated Cb residual is used to derive both Cb and Cr residuals. The array indices x0, y0 specify the location ( x0, y0 ) of the top-left luma sample of the considered transform block relative to the top-left luma sample of the picture. tu_cb_cr_joint_residual[ x0 ][ y0 ] equal to 1 specifies that the indicated Cb residual is used to derive the Cr residual. tu_cb_cr_joint_residual[ x0 ][ y0 ] equal to 0 specifies that Cr residual may be present in the bitstream depending on other syntax elements. When tu_cb_cr_joint_residual[ x0 ][ y0 ] is not present, it is inferred to be equal to 0.

Cited:
JVET-N0027 X JVET-N0347 JVET-N1001 JVET-N1002 JVET-N1027 JVET-P0013 JVET-P0071 JVET-P0074 JVET-P0075 JVET-P0113 JVET-P0114 JVET-P0115 JVET-P0116 JVET-P0117 JVET-P0118 JVET-P0126 JVET-P0150 JVET-P0151 JVET-P0155 JVET-P0162 more than 20
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Decisions
pending
tu_cb_cr_joint_residual[ x0 ][ y0 ] specifies whether indicated Cb residual is used to derive both Cb and Cr residuals. The array indices x0, y0 specify the location ( x0, y0 ) of the top-left luma sample of the considered transform block relative to the top-left luma sample of the picture. tu_cb_cr_joint_residual[ x0 ][ y0 ] equal to 1 specifies that the indicated Cb residual is used to derive the Cr residual. tu_cb_cr_joint_residual[ x0 ][ y0 ] equal to 0 specifies that Cr residual may be present in the bitstream depending on other syntax elements. When tu_cb_cr_joint_residual[ x0 ][ y0 ] is not present, it is inferred to be equal to 0.
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