VIDEO DECODING METHOD AND APPARATUS BY CHROMA-MULTI-TRANSFORM, AND VIDEO ENCODING METHOD AND APPARATUS BY CHROMA-MULTI-TRANSFORM

摘要

Proposed is a method and apparatus for transforming and inverse-transforming a chroma block using a variable transform kernel, in video encoding and decoding processes. A video decoding method proposed in the present disclosure to solve the technical problem may comprise the steps of: obtaining, from a bit stream, chroma multi-transform kernel information indicating whether a chroma transform kernel for inverse-transformation of a chroma block is determined as one of a plurality of chroma transform kernels; when the chroma transform kernel is determined to be one of the plurality of chroma transform kernels according to the multi-transform kernel information, determining whether to determine the chroma transform kernel using a luma transform kernel; and performing inverse-transformation with respect to the chroma block using the chroma transform kernel.