Video encoding method and device

Abstract

The invention discloses a video encoding method and device. The video encoding method comprises the steps of performing intra-frame prediction on odd-numbered lines of the current block, obtaining reconstructed odd-numbered lines according to a residual error between the acquired odd-numbered line prediction data and source odd-numbered lines, predicting the current reconstructed odd-numbered lineby using the previous reconstructed odd-numbered line, determining a precise prediction direction which enables the sum of squares of prediction errors of all pixels in the reconstructed odd-numberedlines to be the minimum, predicting an even-numbered line according to the adjacent odd-numbered lines to obtain accurate even-numbered line prediction data, and encoding the even-numbered lines according to a residual error between the accurate even-numbered line prediction data and source even-numbered lines. According to the invention, the prediction direction is refined according to the reconstructed odd-numbered lines to obtain the more accurate prediction direction, and then prediction is performed on the even-numbered lines by using the odd-numbered lines according to the more accurateprediction direction to obtain encoding of the even-numbered lines. The even-numbered lines are predicted by using the adjacent odd-numbered lines, and the prediction direction is more accurate, so that residual error data of the even-numbered lines in encoding is enabled to be smaller, and the efficiency of video encoding is improved.

Description

technical field [0001] The present invention relates to the technical field of video encoding, in particular to a video encoding method and device. Background technique [0002] Starting from Advanced Video Coding H.264, intra-frame directional predictive coding has become the mainstream technology of video intra-block coding. In this technique, the prediction of the current coding block is obtained from the linear prediction of its left adjacent column and upper adjacent row according to one direction, such as figure 1 As shown in the schematic diagram of intra prediction, the current coding block is an 8×8 block, and the pixel shown by the triangle is its upper left adjacent reference pixel. Intra-frame prediction first selects a direction, and then each row or column in the current block is obtained from its upper-left adjacent row and column according to this direction. The sixth row shown in the figure maps to the pixel position of the upper adjacent row according to ...

AI Technical Summary

Problems solved by technology

[0003] One problem with intra-frame prediction is that, because the reference prediction pixel is located in the upper left adjacent position of the block, and the prediction correlation is the farther the distance is, the lower the prediction accuracy is not high for the far lower right pixel in the current block.

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