Method and device for intra-frame prediction

An intra-frame prediction and prediction direction technology, which is applied in the field of multimedia video coding and decoding, can solve the problems of increasing mode coding redundancy and failing to achieve accurate prediction, and achieves the improvement of coding efficiency, solving inaccurate prediction and reducing residual error. Effect

Inactive Publication Date: 2013-08-14
PEKING UNIV
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Problems solved by technology

If the original simple prediction method is still used, the prediction values ​​obtained by a large number of prediction modes will be similar, which will not only fail to achieve the purpose of accurate prediction, but also increase the redundancy of mode coding

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  • Method and device for intra-frame prediction
  • Method and device for intra-frame prediction

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[0027] A more complete and better understanding of the invention, and many of its attendant advantages, will be readily apparent from the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention and form part of this disclosure. As a part of the invention, the exemplary embodiments of the invention and their descriptions are used to explain the invention, and do not constitute an improper limitation of the invention.

[0028] In order to make the above purposes, features and advantages more obvious and understandable, the following combined image 3 -6 and specific embodiments The present invention is described in further detail.

[0029] like figure 2 Shown, a kind of intra prediction method, comprises the following steps:

[0030] S21. Select reference pixels required for prediction for the intra prediction mode;

[0031] ...

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Abstract

The invention discloses a method and a device for intra-frame prediction. The method comprises the following contents: defining a straight line according to the direction of the intra-frame prediction and the position of a to-be-forecasted pixel; selecting the surrounding pixel of A which is an intersection of the line and the coded pixel as a reference pixel; conducting the intra-frame prediction on the base of an original value of the reference pixel; and forecasting that an adopted filter coefficient is related to the distance between the A and the refer pixel. Through the design of the reasonable intra-frame prediction method, the pixel value of the intra-frame prediction is closer to the original pixel; the problems that the forecasting is inaccurate and the entropy coding is redundant, as only the simple forecasting technology is applied for a multi-direction intra-frame prediction are solved; and the more accurate forecasting value can be obtained. Therefore, the residual error of the forecasting is reduced, and the coding efficiency is improved.

Description

technical field [0001] The present invention relates to the technical field of multimedia video encoding and decoding, in particular to an intra-frame prediction method and device. Background technique [0002] There are four types of redundancy in video sequences: temporal redundancy, spatial redundancy, visual redundancy, and coding redundancy. For the first two types of redundancy, we generally use predictive techniques to reduce this redundancy. According to different prediction modes, the prediction mode of the prediction unit can be divided into intra prediction and inter prediction. Among them, the intra-frame prediction refers to predictive coding by using only the spatial domain information of the current frame; and the inter-frame prediction refers to the predictive coding by using the time-domain information of adjacent frames. Generally speaking, the accuracy of inter-frame prediction is much higher than that of intra-frame prediction, but intra-frame predictio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/32H04N7/26H04N19/593
Inventor 马思伟余琴王诗淇
Owner PEKING UNIV
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