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17th Meeting: Brussels, January 2020 2019-12-31 18:37
Residual coding simplification
Authors: J. Choi LGE S. Yoo LGE Jin Heo LGE J. Lim LGE S. Kim LGE
Abstract
In current VVC draft, Rice parameter for transform skip is derived from the predetermined equation. However, a look-up table of 32 entries is still used to derive Rice parameter in regular residual coding. This contribution proposes a few candidate equations to derive the Rice parameter without the look-up table. The proposed equations require shift and additions, and it generates the exactly same or almost same Rice parameters as the look-up table. The coding performance of each proposed method is shown below:
Meeting Notes
JVET-Q0299 Residual coding simplification [J. Choi, S. Yoo, J. Heo, J. Lim, S. Kim (LGE)]

In the current VVC draft, Rice parameter for transform skip is derived from a predetermined equation. However, a look-up table of 32 entries is still used to derive the Rice parameter in regular residual coding. This contribution proposes a few candidate equations to derive the Rice parameter without the look-up table. The proposed equations require shift and additions, and generate exactly the same or almost the same Rice parameters as the look-up table. The coding performance of each proposed method is shown below:

Method 1:

Exactly the same with the VTM-7.0 anchor

Method 2:

CTC QPs: 0.00% (AI), 0.00% (RA), -0.03% (LD)

Low QPs: -0.02% (AI), 0.08% (RA), 0.06% (LD)

Method 3:

CTC QPs: 0.00% (AI), 0.01% (RA), 0.02% (LD)

Low QPs: 0.00% (AI), 0.00% (RA), -0.01% (LD)

There was no need for consideration of this after the CE3 decision.

References:
JVET-N1010
Cited:
JVET-Q0639 X
PATENTS:
3150554 0.34 WO/2021/055828 0.33 20210092405 0.32 3903493 0.31 3861747 0.30 3954118 0.28 20240073438 0.27 20230269389 0.26
ARCHIVE v1 :
JVET-Q0299.docx result_JVET-Q0299_method1_CTC.xlsm result_JVET-Q0299_method1_LowQP.xlsm result_JVET-Q0299_method2_CTC.xlsm result_JVET-Q0299_method2_LowQP.xlsm result_JVET-Q0299_method3_CTC.xlsm result_JVET-Q0299_method3_LowQP.xlsm
Decisions
There was no need for consideration of this after the CE3 decision.
Citation