Method and apparatus for processing video signals using boundary intra coding

摘要

A boundary intra coding flag is obtained according to a current macroblock type. When the boundary intra coding flag indicates that the current macroblock is coded in an intra prediction mode using boundary intra coding, boundary coding information is obtained, and a boundary in the current macroblock is induced based on the boundary coding information. Therefore, the regions divided by the boundary can be coded in the intra prediction mode. The accuracy of a predicted pixel value can be improved by performing the intra prediction for regions divided by the boundary. Accordingly, the residual data transmitted to a decoder can be reduced.

主权项

1. A video signal processing method, comprising:
obtaining a boundary intra coding flag whether a current block is coded by using boundary intra coding; based on the boundary intra coding flag indicating that the current block is coded in an intra prediction mode by using the boundary intra coding, deriving a partition line of the current block based on a base pixel and a boundary code for at least one pixel located on the partition line, the base pixel being a starting point of the partition line, and the boundary code including information indicating whether a turning direction of a current pixel is equal to a turning direction of a previous pixel and a turning angle of the current pixel, the current pixel and the previous pixel being located on the partition line, the partition line being a boundary of a region having a pixel value different from a pixel value of a neighboring region, wherein the current block divides into A region and B region based on the partition line; and decoding each of the regions in the current block including the A region and the B region, wherein deriving the partition line of the current block comprises:
obtaining the base pixel, the boundary code and information about the number of the boundary pixels; andderiving a location of boundary pixels using the base pixel, the boundary code and the information about the number of the boundary pixels,wherein the A region is decoded using a intra prediction mode of the A region being different from a intra prediction mode of the B region.