Intra-frame image predictive encoding and decoding method and video codec

Abstract

The invention discloses an intra-frame image predictive encoding and decoding method and a video codec. The intra-frame image predictive encoding and decoding method comprises the following steps that adjacent reference pixels used for predicting a current transformation unit are determined according to a prediction mode of the current transformation unit; residual values of reconstruction values and original values of the adjacent reference pixels are calculated; lossless compression encoding is conducted on the residual values; intra-frame image predictive encoding is conducted on the current transformation unit according to the original values of the adjacent reference pixels. Or the intra-frame image predictive encoding and decoding method comprises the following steps: the adjacent reference pixels used for predicting the current transformation unit are determined according to the prediction mode of the current transformation unit; the residual values of the reconstruction values and the original values of the adjacent reference pixels are calculated; a lossy second encoding is conducted on the residual values, and reconstruction residual values of the adjacent reference pixels are acquired; the reconstruction values and the reconstruction residual values are added, and then reconstruction original values of the adjacent reference pixels are acquired; the intra-frame image predictive encoding is conducted on the current transformation unit according to the reconstruction original values. The intra-frame image predictive encoding and decoding method and the video codec can improve encoding and decoding efficiency of intra-frame images.

Description

technical field [0001] The present invention relates to the technical fields of image video codec and intra-frame image prediction, in particular to an intra-frame image predictive codec method and a video codec. Background technique [0002] Image and video compression coding and decoding are generally divided into two predictive coding and decoding technologies: inter-frame image coding and intra-frame image coding and decoding. Intra image coding utilizes information from already coded image units of the current frame to predictively encode the currently coded image unit; intra image decoding utilizes information from already decoded image units of the current frame to perform predictive decoding on the currently decoded image unit. [0003] The existing intra-frame image prediction encoding and decoding method uses the reconstruction value of the adjacent reference pixels of the current transformation unit to predict, but there are the following shortcomings: the accurac...

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Problems solved by technology

[0003] The existing intra-frame image prediction encoding and decoding method uses the reconstruction value of the adjacent reference pixels of the current transformation unit to predict, but there are the following shortcomings: the accuracy of intra-frame image prediction is not high, resulting in low efficiency of intra-frame image encoding and decoding

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