Intra-frame prediction mode judgment method and system based on adaptive cost score threshold

An intra-frame prediction mode and intra-frame prediction technology, applied in the field of video coding and decoding, can solve problems such as high complexity, achieve the effect of ensuring rate-distortion performance, reducing coding complexity, and avoiding the calculation of prediction costs

Active Publication Date: 2021-08-17
SHANGHAI UNIV
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Problems solved by technology

However, H.265 / HEVC (High Efficiency Video Coding), a high-efficiency video coding standard released in 2013, does not have enough compression capability to cope with the sharp increase in the amount of video transmission and storage data.
[0003] H.266 / VVC (Versatile Video Coding), as the next-generation coding standard of H.265 / HEVC, introduces many new coding tools to improve coding performance, but at the cost of high complexity

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  • Intra-frame prediction mode judgment method and system based on adaptive cost score threshold
  • Intra-frame prediction mode judgment method and system based on adaptive cost score threshold
  • Intra-frame prediction mode judgment method and system based on adaptive cost score threshold

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Embodiment

[0047] Aiming at the acceleration of intra-frame prediction mode decision process, the present invention proposes a fast algorithm for H.266 / VVC intra-frame prediction layered mode decision based on adaptive cost score threshold. The algorithm firstly aims to reduce the initial detection mode of intra-frame prediction RMD In the RMD-1 stage, the angle pattern is divided into partitions, and the prediction cost of the representative pattern in each area is calculated, and the two patterns with the lowest cost are selected as candidates for the RMD-2 stage. In RMD-2, the hierarchical mode decision framework is used to search the adjacent angle mode for the candidate mode obtained in RMD-1. The search step size decreases with the increase of the level, and the adaptive cost score threshold α is used i Reduce the number of adjacent angle patterns searched in each layer, and finally use the adaptive cost score threshold β for final selection to reduce the number of patterns for calc...

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Abstract

The invention provides an intra-frame prediction mode judgment method and system based on an adaptive cost score threshold, and the method comprises the steps: 1, dividing an intra-frame prediction angle mode into nine regions, selecting one angle mode for each region to form an initial candidate mode set CS1, and calculating the prediction cost of each mode in the CS1; 2, searching an adjacent angle mode by adopting a hierarchical mode judgment framework, and constructing a candidate mode set of the hierarchy; 3, reducing the number of modes for calculating the rate distortion cost by using an adaptive cost score threshold; and 4, selecting the prediction mode with the lowest rate-distortion cost as the optimal prediction mode of intra-frame prediction, and calculating the prediction value of the current block by using the reference pixel to complete the intra-frame prediction of the current block. According to the method, the number of initial candidate mode sets is reduced by utilizing angle partition aiming at intra-frame prediction rough mode judgment, and excessive prediction cost calculation is avoided.

Description

technical field [0001] The present invention relates to the technical field of video encoding and decoding, in particular to a method and system for determining an intra-frame prediction mode based on an adaptive cost score threshold. Background technique [0002] With the development of multimedia technology and streaming media market, ultra-high-definition video has become more and more popular in society because of its high resolution and wide dynamic range of brightness, which brings people an excellent audio-visual experience. However, H.265 / HEVC (High Efficiency Video Coding), a high-efficiency video coding standard released in 2013, does not have enough compression capability to cope with the sharp increase in the amount of video transmission and storage data. [0003] H.266 / VVC (Versatile Video Coding), as the next-generation coding standard of H.265 / HEVC, introduces many new coding tools to improve coding performance, but at the cost of high complexity. As an extre...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04N19/103H04N19/11H04N19/146H04N19/147H04N19/159
CPCH04N19/11H04N19/103H04N19/147H04N19/146H04N19/159
Inventor滕国伟熊丹祺
OwnerSHANGHAI UNIV