Method and apparatus for processing video signals using reduced quadratic transformation

摘要

The present invention provides a method for reconstructing a video signal based on a reduced quadratic transform, the method comprising: obtaining a second transform index from the video signal; Inducing a secondary transform corresponding to the second transform index, wherein the second transform means a reduced second transform, and the reduced second transform is N residual data (Nx1 residual data). Represents a transform in which L pieces of (LN) transform coefficient data (Lx1 transform coefficient vectors) are output by inputting a dual vector); Obtaining a transform coefficient block by performing entropy decoding and inverse quantization on the current block (NxN); Performing an inverse quadratic transform on the transform coefficient block using the reduced quadratic transform; Performing an inverse first-order transform on the block on which the inverse quadratic transform has been performed; And restoring the current block by using the block on which the reverse first-order transform has been performed.