View source for US Patent Application 18198382. IMAGE CODING METHOD BASED ON SECONDARY TRANSFORM, AND DEVICE THEREFOR simplified abstract

=IMAGE CODING METHOD BASED ON SECONDARY TRANSFORM, AND DEVICE THEREFOR=


==Organization Name==

[[LG ELECTRONICS INC.]]


==Inventor(s)==

[[Moonmo Koo of Seoul (KR)]]


[[Seunghwan Kim of Seoul (KR)]]


[[Jaehyun Lim of Seoul (KR)]]


==IMAGE CODING METHOD BASED ON SECONDARY TRANSFORM, AND DEVICE THEREFOR - A simplified explanation of the abstract==


*This abstract for appeared for US patent application  number 18198382 Titled 'IMAGE CODING METHOD BASED ON SECONDARY TRANSFORM, AND DEVICE THEREFOR'

==Simplified Explanation==

The image decoding method described in this document involves several steps. First, transform coefficients are derived by reversing the quantization process using quantized transform coefficients for a specific block. Then, modified transform coefficients are derived by applying an inverse reduced secondary transform (RST) to the original transform coefficients. Finally, a restoration picture is generated by applying an inverse primary transform to the modified transform coefficients, using residual samples for the target block. The modified transform coefficients are arranged in a two-dimensional order based on the row or column priority direction, depending on the intra prediction mode applied to the target block.


==Original Abstract Submitted==

An image decoding method according to the present document comprises the steps of: deriving transform coefficients through inverse quantization on the basis of quantized transform coefficients for a target block; deriving modified transform coefficients on the basis of an inverse reduced secondary transform (RST) for the transform coefficients; and generating, on the basis of an inverse primary transform for the modified transform coefficients, a restoration picture based on residual samples for the target block, wherein the modified transform coefficients derived according to the inverse RST are two-dimensionally arranged according to the order of a row priority direction or a column priority direction according to an intra prediction mode to be applied to the target block.