US 12,231,640 B2
Video decoding method, video encoding method, and related apparatuses
Liqiang Wang, Shenzhen (CN)
Assigned to TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED, Shenzhen (CN)
Filed by TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED, Shenzhen (CN)
Filed on Sep. 30, 2022, as Appl. No. 17/958,200.
Application 17/958,200 is a continuation of application No. PCT/CN2021/119492, filed on Sep. 22, 2021.
Claims priority of application No. 202011112822.0 (CN), filed on Oct. 16, 2020.
Prior Publication US 2023/0024834 A1, Jan. 26, 2023
Int. Cl. H04N 19/44 (2014.01); H04N 19/126 (2014.01); H04N 19/176 (2014.01); H04N 19/91 (2014.01)
CPC H04N 19/126 (2014.11) [H04N 19/176 (2014.11); H04N 19/44 (2014.11); H04N 19/91 (2014.11)] 19 Claims
OG exemplary drawing
 
1. A video decoding method, performed by a computing device, the method comprising:
performing entropy decoding processing on an encoding block of a video image frame to obtain a quantized coefficient block of residual data corresponding to the encoding block;
calculating quantization coefficients in a specified region in the quantized coefficient block to obtain a calculation result of the quantization coefficients;
determining an implicitly derived index value based on the calculation result of the quantization coefficients;
determining a transformation mode of the encoding block according to the implicitly derived index value and a value of an explicit index identifier included in the encoding block, the explicit index identifier including a first index identifier and a second index identifier; and
performing inverse transformation processing on an inverse quantization result of the quantized coefficient block based on the transformation mode of the encoding block,
wherein a transformation mode is determined based on one of the following three tables, and “-” indicates that a value of a corresponding index is not considered in a current scenario:
TABLE 1
 
Value of Value of The implicitly
 
the first the second derived Transformation
index identifier index identifier index value mode
 
First value First value Second value First mode
 
 
 First value Second mode
 
 Second value — Third mode
Second value — — Fourth mode
 
TABLE 2
 
Value of Value of The implicitly
 
the first the second derived Transformation
index identifier index identifier index value mode
 
First value — — Fifth mode
Second value First value Second value Sixth mode
 
 
 First value Seventh mode
 
 Second value — Eighth mode
 
TABLE 3
 
Value of Implicitly Value of
 
the first derived the second Transformation
index identifier index value index identifier mode
 
First value Second value — Nineth mode
 
 First value Second value Tenth mode
 
 
 First value Eleventh mode
Second value — — Twelfth mode.