US 11,895,334 B2
Image coding method on basis of transformation and device therefor
Mehdi Salehifar, Seoul (KR); Seunghwan Kim, Seoul (KR); Moonmo Koo, Seoul (KR); and Jaehyun Lim, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Filed by LG Electronics Inc., Seoul (KR)
Filed on Jan. 17, 2023, as Appl. No. 18/097,625.
Application 18/097,625 is a continuation of application No. 17/507,446, filed on Oct. 21, 2021, granted, now 11,601,679.
Application 17/507,446 is a continuation of application No. 16/772,934, granted, now 11,218,731, issued on Jan. 4, 2022, previously published as PCT/KR2018/015815, filed on Dec. 13, 2018.
Claims priority of provisional application 62/599,020, filed on Dec. 15, 2017.
Prior Publication US 2023/0156223 A1, May 18, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 19/00 (2014.01); H04N 19/60 (2014.01); H04N 19/105 (2014.01); H04N 19/124 (2014.01); H04N 19/176 (2014.01); H04N 19/18 (2014.01); H04N 19/70 (2014.01)
CPC H04N 19/60 (2014.11) [H04N 19/105 (2014.11); H04N 19/124 (2014.11); H04N 19/176 (2014.11); H04N 19/18 (2014.11); H04N 19/70 (2014.11)] 7 Claims
OG exemplary drawing
 
1. A decoding apparatus for image decoding, the decoding apparatus comprising:
a memory; and
at least one processor connected to the memory, the at least one processor configured to:
obtain information on quantized transform coefficients from a bitstream;
derive quantized transform coefficients for a target block based on the information on the quantized transform coefficients;
derive transform coefficients by performing dequantization for the quantized transform coefficients for the target block;
perform an inverse transform for the transform coefficients based on an inverse transform matrix;
derive residual samples for the target block based on a result of the inverse transform; and
generate a reconstructed picture based on the residual samples for the target block and prediction samples for the target block,
wherein based on a number of input elements of the inverse transform being R, a size of the inverse transform matrix is N×R, where each of N and R is a positive integer, and R is less than N.