Image encoder and decoder using undirectional prediction

摘要

The present invention relates to an image encoding and decoding technique, and more particularly, to an image encoder and decoder using unidirectional prediction. The image encoder includes a dividing unit to divide a macro block into a plurality of sub-blocks, a unidirectional application determining unit to determine whether an identical prediction mode is applied to each of the plurality of sub-blocks, and a prediction mode determining unit to determine a prediction mode with respect to each of the plurality of sub-blocks based on a determined result of the unidirectional application determining unit.

主权项

1. An image decoding method, comprising;
performing intra prediction on a first block; performing intra prediction on a second block adjacent to a right side of the first block; performing intra prediction on a third block adjacent to a bottom of the first block, and performing intra prediction on a fourth block adjacent to a right bottom of the first block, wherein the first block, the second block, the third block, and the fourth block are predicted in one intra prediction mode.