Video encoding device and encoding method thereof, video decoding device and decoding method thereof, and directional intra-prediction method to be used thereto

摘要

The present disclosure provides a video encoding apparatus and encoding method thereof, video decoding apparatus and decoding method thereof, and directional intra-prediction method to be used therefor. The video encoding apparatus includes a main mode search unit for searching for main mode for a current block from among directional intra-prediction modes; a sub mode search unit for searching for sub modes formed by inclining indicated orientation of found main mode by main mode search unit by a predetermined offset in both clockwise and counterclockwise directions; a predicted block generator for generating predicted block of the current block from neighboring blocks of the current block based on found main mode by the main mode search unit and found sub modes by the sub mode search unit; a differentiator for calculating differential between the current block and the predicted block; and an encoder for encoding calculated differential by the differentiator.

主权项

1. An apparatus for encoding a current block, the apparatus comprising:
a main mode search circuit configured to select a main mode of the current block from among a plurality of directional intra-prediction modes; a sub mode search circuit configured to select a sub mode corresponding to the main mode, wherein the sub mode has a direction defined by rotation of a direction of the main mode by a predetermined angular offset; a predicted block generator configured to generate a predicted block of the current block from reference pixels in at least one neighboring block adjacent to the current block based on the main mode and the sub mode, wherein the predicted block generator is configured to shift the reference pixels by one pixel horizontally or vertically and generate the predicted block by using the shifted reference pixels in the direction of the main mode and wherein a direction of the shifting and the direction of the main mode correspond to the direction of the sub mode; a differentiator configured to calculate a differential between the current block and the predicted block; and an encoder configured to encode the differential and information on the main mode and the sub mode.