Method and device for searching intra prediction mode, method and device for video encoding, and recording medium

Abstract

A method for searching an intra prediction mode is disclosed. The method comprises the following steps: in a first step, based on X object prediction modes, the original pixels of neighboring blocks around the current coded block are used to generate the X first prediction signals of the current coded block under the X object prediction modes, and residuals between the X first prediction signals and original image values of the coded block are obtained as X first residuals; in a second step, first cost of the X object prediction modes is calculated by a first cost calculation method based on afirst residual, and the object prediction mode with the least one example of the first cost in the object prediction mode is used as an intermediate prediction mode; in a third step, based on the intermediate prediction mode, the reconstructed pixels of adjacent blocks are used to generate a second prediction signal of the current encoding block in the intermediate prediction mode, and the residual between the second prediction signal and the original image value of the current encoding block is obtained as a second residual; in a fourth step, the second cost of the intermediate prediction mode is calculated by the second cost calculation method according to the second residual. The prediction mode with the smallest second cost among the intermediate prediction modes is used as the searched final prediction mode, where Y is a natural number less than X.

Description

technical field [0001] The embodiments of the present invention relate to the field of video coding, and in particular, to an intra prediction mode search method and device, a video coding method and device, and a recording medium. Background technique [0002] Visual information is one of the most important sources for humans to obtain external information, but the uncompressed raw video data collected by the camera occupies a huge storage space, with a resolution of 1920×1080, a video format of yuv420 (8bit), and a frame rate of Taking a video at 30 frames per second and a duration of 10 minutes as an example, storing the video without compression requires 52.14 Gbytes of storage space. In order to reduce the bandwidth occupied by video storage and transmission, video data needs to be encoded and compressed. [0003] However, in the coding and compression processing of the prior art, each size of the coding block depends on the reconstruction value of adjacent pixels on i...

AI Technical Summary

Problems solved by technology

Due to the strong dependence of the coding block on the reconstructed pixels of adjacent coding blocks, the chip cannot realize parallelization within the intra prediction algorithm when implementing the algorithm, resulting in insufficient chip processing speed and efficiency.

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