Apparatus and method for image encoding/decoding using predictability of intra-prediction mode

摘要

An apparatus for decoding a video, includes: a mode information extractor to extract mode information on an intra-prediction mode of a current block from encoded data; a prediction mode determiner to determine a candidate intra-prediction mode selected from a plurality of candidate intra-prediction modes as the intra-prediction mode of the current block, when the mode information indicates a first encoding mode; a prediction mode extractor to determine the intra-prediction mode of the current block by using a prediction mode identifier, when the mode information indicates a second encoding mode and includes the prediction mode identifier; and a decoder to decode the encoded data to produce a residual block, and reconstruct the current block by adding the produced residual block to a prediction block predicted based on the intra-prediction mode of the current block determined by either the prediction mode determiner or the prediction mode extractor.

主权项

1. An apparatus for decoding a video, the apparatus comprising:
a mode information extractor configured to extract mode information on an intra-prediction mode of a current block from encoded data; a prediction mode determiner configured to
derive a set of candidate intra-prediction modes including at least three candidate intra-prediction modes, depending on the current block, wherein the derived set of candidate intra-prediction modes includes an intra-prediction mode of at least one neighboring block adjacent to the current block when the intra-prediction mode of the at least one neighboring block is available, anddetermine a candidate intra-prediction mode selected from the derived set of candidate intra-prediction modes as the intra-prediction mode of the current block without comparing mode numbers of candidate intra-prediction modes included in the derived set each other, when the mode information indicates a first encoding mode; a prediction mode extractor configured to determine the intra-prediction mode of the current block by using a prediction mode identification information, when the mode information indicates a second encoding mode and includes the prediction mode identification information; and a decoder configured to decode the encoded data to produce a residual block, and reconstruct the current block by adding the produced residual block to a prediction block predicted based on the intra-prediction mode of the current block determined by either the prediction mode determiner or the prediction mode extractor.