Method and device for encoding/decoding image using feature vectors of surrounding blocks

摘要

A video encoding apparatus, a decoding apparatus and method thereof by using feature vectors of at least one neighboring block are provided. In the video encoding apparatus, the decoding apparatus and the method, the feature vector is extracted from pixels of at least one neighboring block, and an optimal prediction mode represented by the feature vector is extracted with reference to a preset feature vector distribution of image blocks. The extracted optimal prediction mode is decided as a most probable mode (MPM) or an intra mode of a current block, and the current block is intra-predicted and encoded or decoded by using pixels of the at least one neighboring block adjacent to the current block.

主权项

1. A video encoding apparatus, comprising:
an intra prediction encoder configured to determine an intra mode of a current block from among a plurality of intra modes, and perform an intra prediction and encoding on the current block based on the intra mode of the current block by using pixels of at least one neighboring block adjacent to the current block; a feature vector extractor configured to generate a feature vector from pixels of the at least one neighboring block, wherein the feature vector is generated from a plurality of differences between values of adjacent pixels of the at least one neighboring block, respective differences of the plurality of differences are calculated based on values of the adjacent pixels located in respective directions of a plurality of directions, the feature vector includes a plurality of elements, and respective elements of the plurality of elements correspond to respective differences of the plurality of differences; and a prediction mode encoder configured to extract, from a preset feature vector distribution, a prediction mode identified by the feature vector, the preset feature vector distribution including respective feature vectors for respective intra modes, and encode the identified prediction mode as a most probable mode (MPM) for the intra mode of the current block, wherein the MPM is used for predicting the intra mode of the current block, and a length of encoded data for indicating the intra mode of the current block is determined according to whether the intra mode of the current block is equal to the MPM.