A Boundary Filtering Method for Intra Prediction

Abstract

The invention discloses a boundary filtering method for intra-frame prediction and relates to the technical field of video coding. First, through the rate-distortion optimization decision, it is adaptively selected whether to perform boundary filtering on the intra prediction block; when filtering, for the first N rows or first N columns of the intra prediction block, the relative boundary distance is used through the intra prediction block filter Exponentially attenuated filter coefficients are used for filtering; and for different intra-frame prediction block sizes, different filter strengths are used; thus solving the problem of intra-frame prediction block boundary distortion, increasing intra-frame prediction accuracy, and improving the encoding of intra-frame prediction blocks Efficiency; while increasing the practicality and robustness of the boundary filtering technique.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a boundary filtering method for intra-frame prediction, which can be used to filter intra-frame prediction blocks to enhance the accuracy of intra-frame prediction, thereby improving the coding efficiency of intra-frame prediction blocks. Background technique [0002] Intra-frame filtering technology is a very effective coding tool for optimizing the boundaries of intra-frame prediction blocks, which can effectively alleviate the distortion at the boundaries of intra-frame prediction blocks. [0003] In the High Efficiency Video Coding (HEVC) standard, the existing method adopts two types of boundary filter technologies for intra-frame prediction. One is for the DC (Direct Current) prediction mode (DC prediction mode), using a two-tap filter (filter coefficient is [1 / 4 3 / 4]) to the first row and first column of the intra prediction block Filtering; the other is to f...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiencies in the prior art above, the present invention provides a boundary filtering method for intra-frame prediction, which can effectively solve the problem of intra-frame prediction block boundary distortion, and can increase the accuracy of intra-frame prediction and improve the accuracy of intra-frame prediction blocks. coding efficiency

Images