Title:
METHOD AND APPARATUS FOR CODING IMAGE ON BASIS OF TRANSFORM
Document Type and Number:
WIPO Patent Application WO/2021/010678
Kind Code:
A1
Abstract:
An image decoding method according to the present document may comprise the steps of: deriving a first variable indicating whether there is a valid coefficient in a region excluding a DC region from a current block; deriving a second variable indicating whether there is a valid coefficient in a second region excluding a first region formed at the upper left end of the current block; when the first variable indicates that the valid coefficient exists in the region excluding the DC region, and the second variable indicates that the valid coefficient does not exist in the second region, parsing an LFNST index from the bitstream; and applying an LFNST matrix derived on the basis of the LFNST index to transform coefficients in the first region, to derive the modified transform coefficients.
Inventors:
KOO MOONMO (KR)
KIM SEUNGHWAN (KR)
LIM JAEHYUN (KR)
KIM SEUNGHWAN (KR)
LIM JAEHYUN (KR)
Application Number:
PCT/KR2020/009124
Publication Date:
January 21, 2021
Filing Date:
July 10, 2020
Export Citation:
Assignee:
LG ELECTRONICS INC (KR)
International Classes:
H04N19/60; H04N19/122; H04N19/124; H04N19/132; H04N19/176; H04N19/18; H04N19/70
Other References:
BROSS, Benjamin et al. Versatile Video Coding (Draft 5). Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-N1001-v10. 14th Meeting: Geneva, CH. PP. 1-394, 02 July 2019. [Retrieved on 23 September 2020]. Retrieved from:
SIEKMANN, Mischa et al. CE6-2.1: Simplification of Low Frequency Non-Separable Transform. Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-O0094-r1. 15th Meeting: Gothenburg, SE. PP. 1-7, 01 July 2019. [Retrieved on 23 September 2020]. Retrieved from:
KOO, Moonmo et al. Non-CE6: LFNST simplification based on the methods proposed in CE6-2.1a. Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-O0209. 15th Meeting: Gothenburg, SE. PP. 1-15, 05 July 2019. [Retrieved on 23 September 2020]. Retrieved from:
JUNG, Jason et al. Non-CE6: Simplified LFNST signalling. Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-O0472-v5. 15th Meeting: Gothenburg, SE. PP. 1-5, 11 July 2019. [Retrieved on 23 September 2020]. Retrieved from:
KOO, Moonmo et al. CE6: Reduced Secondary Transform(RST)(CE6-3.1). Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-N0193. 14th Meeting: Geneva, CH. PP. 1-19, 27 March 2019. [Retrieved on 23 September 2020]. Retrieved from:
SIEKMANN, Mischa et al. CE6-2.1: Simplification of Low Frequency Non-Separable Transform. Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-O0094-r1. 15th Meeting: Gothenburg, SE. PP. 1-7, 01 July 2019. [Retrieved on 23 September 2020]. Retrieved from:
KOO, Moonmo et al. Non-CE6: LFNST simplification based on the methods proposed in CE6-2.1a. Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-O0209. 15th Meeting: Gothenburg, SE. PP. 1-15, 05 July 2019. [Retrieved on 23 September 2020]. Retrieved from:
JUNG, Jason et al. Non-CE6: Simplified LFNST signalling. Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-O0472-v5. 15th Meeting: Gothenburg, SE. PP. 1-5, 11 July 2019. [Retrieved on 23 September 2020]. Retrieved from:
KOO, Moonmo et al. CE6: Reduced Secondary Transform(RST)(CE6-3.1). Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11. JVET-N0193. 14th Meeting: Geneva, CH. PP. 1-19, 27 March 2019. [Retrieved on 23 September 2020]. Retrieved from:
Attorney, Agent or Firm:
ENVISION PATENT & LAW FIRM (KR)
Download PDF:
Previous Patent: BATTERY RACK AND POWER STORAGE APPARATUS COMPRISING SAME
Next Patent: CERCLAGE OPERATION DEVICE PROVIDED WITH POSITION FIXING DEVICE
Next Patent: CERCLAGE OPERATION DEVICE PROVIDED WITH POSITION FIXING DEVICE