Method and apparatus for encoding video by compensating for pixel value according to pixel groups, and method and apparatus for decoding video by the same

摘要

Provided are a method and apparatus of encoding a video by compensating for a pixel value and a method and apparatus of decoding a video by compensating for a pixel value. The method of encoding the video includes: encoding image data; decoding the encoded image data and generating a restored image by performing loop filtering on the decoded image data; determining a compensation value corresponding to errors between a predetermined group restored pixels in the restored image and corresponding original pixels, and a pixel group including a restored pixel to be compensated for by using the compensation value; and encoding the compensation value and transmitting the encoded compensation value and a bitstream of the encoded image data.

主权项

1. A video decoding method comprising:
obtaining information about pixel value compensation, from a bitstream; when the information about pixel value compensation indicates a band type, obtaining information about an offset of a compensation value of a pixel band from the bitstream; applying the information about an offset of compensation value of a predetermined band to one or more pixel included in the predetermined band among pixels of a current block; and when the information about pixel value compensation indicates an edge type, obtaining information about an offset of a compensation value of a predetermined direction of an edge; applying the information about an offset of a compensation value of the predetermined direction of an edge to a pixel among pixels in the predetermined direction of an edge among pixels of a current block, wherein the band is one of bands generated by splitting total range of pixel values.