Method and apparatus for processing video signals by applying quadratic transformation to divided blocks

摘要

The present invention provides a method of reconstructing a video signal, the method comprising: obtaining a transform coefficient block by performing entropy decoding and inverse quantization on a current block; Inducing a secondary transform corresponding to a specific region in the transform coefficient block, wherein the specific region represents an area including an upper left block of the transform coefficient block; Performing an inverse quadratic transform on each of the sub-blocks in the specific region by using the 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.