Encoding and decoding method and device, image element interpolation processing method and device

Abstract

The invention discloses an interframe forecasting coding method, a decoding method, a coder, a decoder, a sub-pixel interpolation processing method and a sub-pixel interpolation processing device. The interframe forecasting coding and decoding technical proposal provided by the invention is that: sub-pixel interpolation is respectively performed on integer pixel samples of image blocks waiting for coding for a plurality of times through consideration of affection of texture distribution direction of images on precision of sub-pixel reference samples and by the means of adjusting interpolation directions, and multiple groups of sub-pixel reference sample values with different precisions are obtained, and then reference sample values with highest precision are selected from integer pixel sample values and various sub-pixel reference sample values, thereby encoding rate of a coding end is improved. The sub-pixel interpolation technical proposal provided by the invention is that: at least two different interpolation directions are set for each sub-pixel waiting for interpolation and corresponding predicted values are computed, and then optimal values are selected from all the predicated values and taken as optimal predicted values of sub-pixel samples waiting for interpolation, thereby the precision of the sub-pixel reference sample values is improved.

Description

Technical field [0001] The present invention relates to multimedia technology, in particular to an inter-frame prediction encoding method, decoding method, encoding device, decoding device, and a sub-pixel interpolation processing method and device. Background technique [0002] With the development of multimedia technology and the rapid promotion of multimedia applications, video image compression standards and technologies have received widespread attention. The current video coding standards, H.26x and MPEG-x (MPEG, Motionpicture experts group, motion picture experts group) And the video standards in the AVS (Audio Video Standard, Audio Video Coding Standard) standard formulated by the China Audio and Video Codec Technical Standard Working Group are all based on a hybrid coding framework. This hybrid coding framework can use predictive coding to remove temporal redundancy, transform coding to remove spatial redundancy, and entropy coding to remove statistical redundancy. [00...

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Problems solved by technology

[0027] The present invention provides an inter-frame predictive encoding method, decoding method, encoding device, and decoding device to solve the problem of low encoding rate caused by only using the horizontal and vertical interpolation directions of images in the prior art;

[0028] The present invention also provides a sub-pixel interpolation processing method and device to solve the problem of low accuracy of sub-pixel reference sample values ​​in the prior art

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