Intra frame image prediction coding and decoding methods, video coder and video decoder

Abstract

The invention discloses intra frame image prediction coding and decoding methods, a video coder and a video decoder, wherein the intra frame image prediction coding method comprises the following steps: selecting part of pixels in a current prediction unit for predicting so as to obtain the predicted pixels of the selected pixels; acquiring the residual signals of the predicted pixels; sequentially performing transformation, quantization, entropy coding, inverse quantization and inverse transformation to the residual signals; reconstructing the processed signals to obtain the reconstructed pixels; and taking the reconstructed pixels as reference pixels of the current prediction unit and performing intra frame image prediction coding. Through the adoption of the intra frame image prediction coding and decoding methods, the video coder and the video decoder, the accuracy of the prediction for an intra frame image is improved, so that the efficiency of the coding and decoding for the intra frame image is improved; and since the intra frame image prediction coding and decoding methods, the video coder and the video decoder do not break the structure of a convention video prediction coding and decoding unit, the intra frame image prediction coding and decoding methods, the video coder and the video decoder are in favor of hardware implementation. The intra frame image prediction coding and decoding methods, the video coder and the video decoder can be applied in the prediction mode of a conventional intra frame image and improves the accuracy of the prediction for the conventional intra frame image, and can also be applied in the prediction of a boundary image prediction unit when the intra frame image is coded.

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-frame image encoding / decoding uses information from already encoded / decoded image units of the current frame to perform predictive encoding / decoding on the current encoded / decoded image unit. [0003] The existing intra-frame image prediction encoding and decoding method uses the adjacent pixels of the current prediction unit for prediction, but has the following disadvantages: the accuracy of intra-frame image prediction is not high, resulting in low efficiency of intra-frame image encoding and decoding. First, the correlation between adjac...

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Problems solved by technology

[0003] The existing intra-frame image prediction encoding and decoding methods use the adjacent pixels of the current prediction unit for prediction, 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

First, the correlation between adjacent pixels and the pixels in the current prediction unit is weaker; second, at the image boundary, the prediction unit has no adjacent pixels that can be used as reference pixels

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