Method and device for intra-frame prediction and intra-frame prediction-based encoding/decoding method and system

Abstract

The invention discloses a method and a device for intra-frame prediction and an intra-frame prediction-based encoding/decoding method and an intra-frame prediction-based encoding/decoding system. The prediction method comprises the following steps of: determining adjacent blocks of M*N blocks to be predicted, and selecting corresponding Ki reference sample points from the adjacent blocks according to the length Ki (i is equal to 0, 1, 2,...,(M*N-1)) of a filter at each position i in the blocks to be predicted to form a sample point set for the intra-frame prediction, wherein ki is equal to 0, 1, 2,..., Ki-1, Ki is a natural number and is more than 1, and M and N are natural numbers; selecting a prediction direction m, and determining the prediction weighting coefficient Wi (m, k) of each sample point Ci to be predicted in the blocks to be predicted respectively, wherein i is equal to 0, 1, 2,...,(M*N-1); and calculating prediction values of current sample points to be encoded according to the prediction weighting coefficients Wi (m, k) and the sample point set for the intra-frame prediction. The prediction method improves the prediction precision of an intra-frame prediction mode, so that the integral encoding performance is improved.

Description

technical field [0001] The present invention relates to the fields of data compression and image / video encoding and decoding of digital signal processing, in particular to an intra-frame prediction method and device, and an intra-frame prediction-based encoding / decoding method and system. Background technique [0002] Intra prediction is one of the important coding techniques to eliminate spatial redundancy. Harrison first researched intra-frame prediction technology. The method is to use the weighted sum of previously encoded pixels as the prediction value of the current pixel. (Adjacent pixels within multiple lines) Performance of DPCM technology. [0003] In video image coding, the elimination of spatial redundancy is first reflected in the processing in the frequency domain. The I-frame coding in the MPEG-2 standard adopts a method of differentially predicting DC coefficients, which can be regarded as a kind of intra-frame prediction in the frequency domain. In the MP...

AI Technical Summary

Problems solved by technology

This method is relatively simple and easy to implement, but it does not take into account the spatial correlation between the sample point and the reconstruction point

Images