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Multi-directional intra-frame forecast encoding and decoding method and device

A codec method and intra-frame prediction technology, which are applied in the field of multi-directional intra-frame prediction codec methods and devices, can solve problems such as the inability to guarantee accuracy, achieve accurate prediction values, reduce prediction residuals, and improve The effect of coding efficiency

Active Publication Date: 2013-03-20
PEKING UNIV
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Problems solved by technology

If 9 prediction modes are still used in the 64x64 intra prediction block, the prediction accuracy will not be guaranteed

Method used

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  • Multi-directional intra-frame forecast encoding and decoding method and device
  • Multi-directional intra-frame forecast encoding and decoding method and device
  • Multi-directional intra-frame forecast encoding and decoding method and device

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Embodiment Construction

[0050] Embodiments of the present invention will be described with reference to FIGS. 1-8.

[0051] In order to make the above objects, features and advantages more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] As shown in Figure 3(a), an intra-frame prediction coding method includes the following steps:

[0053] S31. For a prediction unit at the encoding end, initialize the current prediction mode to -1, and add 1 to the sequence number of the current prediction mode;

[0054] S32. Select reference pixels required for prediction for the intra prediction mode;

[0055] S33. Obtain the prediction value of the prediction unit by using the reference pixel prediction;

[0056] S34. Calculate the coding cost of the intra prediction mode, and select the current optimal coding mode;

[0057] S35. If the sequence number of the intra-frame prediction mode is greater tha...

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Abstract

The invention discloses an intra-frame forecast encoding and decoding method and a device. The method comprises the following steps that an encoding end selects a reference pixel required for executing intra-frame forecast of a set intra-frame forecast direction according to the set intra-frame forecast direction for an input intra-frame forecast unit; the forecast unit is forecasted with the reference pixel according to the set forecast direction; a pixel forecast value of the forecast unit is obtained; the pixel forecast value is filtered by the selected reference pixel; all forecast directions are traversed; entropy encoding is conducted on the optimal forecast direction; and a decoding end resolves an intra-frame forecast mode and adopts a intra-frame forecast method same as that of the encoding end to obtain an intra-frame forecast value.

Description

technical field [0001] The present invention relates to the technical field of multimedia video encoding and decoding, in particular to a multi-directional intra-frame prediction encoding and decoding 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-fram...

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/573
Inventor 马思伟余琴赵亮
Owner PEKING UNIV
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