Rapid intra-frame prediction mode selection method in high-definition video coding

Abstract

The invention provides a rapid intra-frame prediction mode selection method in high-definition video coding. The method includes the steps that firstly, an SAD is utilized for processing a residual error, and several candidate prediction modes small in error are selected out; a simplified rate-distortion cost function, namely a cost function of the SATD is adopted to further decrease the number of the candidate prediction modes, and the candidate prediction modes are obtained in a threshold value mode, wherein the candidate prediction modes of prediction units of the same size may be different in number; whether the most probable mode (MPM) is contained in the candidate prediction modes or not is detected through probability statistics of the optimal mode and the relevance of prediction information between the adjacent prediction units, wherein the MPM indicates the optimal prediction mode of the left coded prediction unit and the upper coded prediction unit surrounding the current prediction unit; if the MPM is contained in the candidate prediction modes, only the MPM contained in the candidate prediction modes serves as a final RDO candidate prediction mode; if the MPM is not contained in the candidate prediction modes, the candidate prediction mode which is further screened serves as the final RDO candidate prediction mode; finally, the current optimal intra-frame prediction mode of a coding block is obtained according to the Lagrange rate-distortion optimization criterion.

Description

Technical field: [0001] The invention belongs to the field of video compression coding in signal processing, and particularly proposes a fast intra prediction mode selection method for the new generation of video coding field. Under the premise of ensuring image quality, the speed of high-definition video intra prediction coding is accelerated. Background technique: [0002] High Efficiency Video Coding (HEVC) is a new-generation video coding standard jointly formulated by ISO / IEC MPEG and ITU-T VCEG. It inherits some of the technologies of the existing video coding standard H.264 / AVC. Improvements have been made to double the compression efficiency on the basis of the original video decoding quality. That is to say, the coding complexity can be appropriately increased to ensure that the video image quality remains unchanged, and the video code stream is reduced by 50% (see M. Viitanen, J. Vanne, TDHamalainen, et al.. Complexity analysis of next-generation HEVC decoder[A].IEEE I...

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Problems solved by technology

[0005] In order to solve the problem of high complexity of intra-frame prediction coding in current high-definition video coding, the present invention makes full use of the probability statistics of the optimal mode and the correlation of prediction information between adjacent prediction units, and adopts absolute error and SAD (Sum of Absolute Difference ) and simplify the rate-distortion cost model to reduce the number of intra-frame prediction modes, and finally use Lagrangian rate-distortion optimization to select the best intra-frame prediction mode in fewer candidate modes to achieve fast intra-frame prediction mode in high-definition video coding purpose of choice

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