DCT-based 3D-HEVC fast intra-frame prediction decision-making method

Abstract

The invention discloses a DCT-based 3D-HEVC fast intra-frame prediction decision-making method. The method comprises the following steps: firstly, calculating a DCT matrix of a current prediction block by utilizing a DCT formula; then, judging whether the left upper corner coefficient of a current coefficient block is provided with an edge and further judging whether the right lower corner coefficient thereof is provided with an edge; and finally, judging whether DMMs need to be added into an intra-frame prediction mode candidate list through judging whether the edges are provided. According to the DCT-based 3D-HEVC fast intra-frame prediction decision-making method, a depth map is introduced into the 3D-HEVC to achieve better view synthesis; aiming at the depth map intra-frame predicationcoding, a 3D video coding extension development joint cooperative team proposes four new kinds of intra-frame predication modes DMMs for the depth map. The DCT has the characteristic of energy aggregation, so that whether a coding block is provided with an edge can be obviously distinguished in the 3D-HEVC depth map coding process. The DCT-based 3D-HEVC fast intra-frame prediction decision-makingmethod has the advantages of low calculation complexity, short coding time and good video reconstruction effect.

Description

technical field [0001] The invention relates to the field of video coding, in particular to a DCT-based 3D-HEVC fast intra-frame prediction decision-making method. Background technique [0002] In the past few years, with the increasing demand for 3D video services, the display, compression and transmission of 3D video has become a new and challenging research topic. The video format of multi-view plus depth map (MVD) is one of many promising video representation forms. 3D Extensions for High Quality Video Coding (3D-HEVC) proposed by the Joint Collaborative Team for Development of 3D Video Coding Extensions (JCT-3V) is an emerging video coding standard for compressed MVD data. [0003] Since the depth map has sharp edges and a large number of near-smooth regions, depth map coding and texture map coding have great differences. If the depth map is encoded using traditional texture map intra prediction modes, this will lead to distorted edges and poor overall compositing. T...

AI Technical Summary

Problems solved by technology

Although the DCT decorrelation performance is getting better and better as the transform size increases, but the improvement rate gradually slows down, because the existence of the cosine function makes the DCT process must use floating point numbers, which inevitably brings rounding errors

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