Video encoding and decoding interframe image predicting method and video codec

Abstract

The invention discloses a video encoding and decoding interframe image predicting method and a video codec. The method comprises the following steps: conducting motion evaluation at a position of the whole pixel of a reference frame, and determining the optimum motion vector of the whole pixel position of the current predicting unit in the current frame; then respectively executing first interpolation filter process, non-whole pixel position motion evaluation and motion compensation to obtain a first prediction error, executing second interpolation filter process, non-whole pixel position motion evaluation and motion compensation to obtain a second prediction error, wherein the reference image of the first interpolation filter process comes from prediction units adjacent to the left and upper side of the current predicting unit in the current frame, and the reference image of the second interpolation filter process comes from the reference frame; selecting to execute interpolation filter process corresponding to prediction errors with minimum rate distortion cost or minimum distortion cost in the first prediction error and the second prediction error; and setting interpolation identification so as to lead the interpolation identification to indicate the execution of the selected interpolation filter process. With the invention, the video coding and decoding efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of moving image predictive coding and interpolation filtering, in particular to a video codec inter-frame image prediction method and a video codec. Background technique [0002] Motion image 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 blocks of the current frame to perform predictive encoding / decoding on the currently encoded / decoded image block. Inter-frame image encoding / decoding performs predictive encoding / decoding on the currently encoded / decoded image by using the image frame information that has been encoded / decoded. [0003] Inter-frame image encoding / decoding provides inter-frame image prediction with the smallest possible residual signal for the current frame by interpolating and ...

AI Technical Summary

Problems solved by technology

However, the image signal after interpolation is used to predict the current frame, and the image information of the current frame cannot be utilized in the existing interpolation algorithm

[0004] In the proposals of international video compression coding standards in the past two years, among the improved algorithms for inter-frame image coding and decoding prediction information, there is a second-order prediction of inter-frame image prediction information by using the spatial adjacent information of the current coded / decoded block in the current frame. However, in the process of realizing the present invention, the inventor found that all these algorithms are changes to the inter-frame prediction information, and the efficiency of video encoding and decoding is not high

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