IMAGE ENCODING METHOD AND DEVICE FOR SAMPLE VALUE COMPENSATION AND IMAGE DECODING METHOD AND DEVICE FOR SAMPLE VALUE COMPENSATION

摘要

Provided are image encoding method and device and image decoding method and device for generating a restored image in which errors from an original image are minimized. An image decoding method comprises the steps of: parsing from a bitstream an edge correction parameter for correcting a restored pixel comprised in a current block; determining, on the basis of a first threshold value comprised in the parsed edge correction parameter, whether or not the restored pixel is comprised in an edge region; if the restored pixel is comprised in the edge region, determining, on the basis of a second threshold value comprised in the edge correction parameter, whether or not the restored pixel is to be corrected; and, if the restored pixel is to be corrected, compensating the sample value of the restored pixel on the basis of a third threshold value comprised in the edge correction parameter.