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Method and apparatus for forecasting and selecting optimum estimation mode in a frame

A prediction mode and optimal prediction technology, applied in the field of image processing, can solve the problems of complex implementation and slow processing speed, and achieve the effect of reducing complexity, improving processing speed, and speeding up processing speed.

Active Publication Date: 2009-01-21
VIMICRO ELECTRONICS CORP
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Problems solved by technology

[0009] Existing intra-frame prediction methods use an exhaustive algorithm when selecting the optimal prediction mode, predict each mode, obtain the prediction block, and calculate the RDCost, and select the prediction mode with the smallest RDCost as the optimal prediction mode. The implementation of this algorithm is complex and the processing speed is slow

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  • Method and apparatus for forecasting and selecting optimum estimation mode in a frame
  • Method and apparatus for forecasting and selecting optimum estimation mode in a frame

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Embodiment Construction

[0038] The intra prediction method and device of the embodiments of the present invention treat the prediction mode of the block to be encoded differently according to the position of the block to be encoded, so as to reduce the implementation complexity and speed up the processing speed.

[0039] Such as Figure 4 As shown, the method for selecting the optimal prediction mode for intra prediction in the embodiment of the present invention includes the following steps:

[0040] Step 41, judging the position of the block to be encoded;

[0041] The location of the block to be encoded includes the following four types:

[0042] Position type 1, in the upper left corner of the image;

[0043] Position type 2, at the far left of the image, but not at the top of the image;

[0044] Position type 3, at the top of the image, but not at the leftmost of the image;

[0045] Position type 4, neither at the leftmost nor at the top of the image.

[0046] Step 42, for position type 1, ...

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Abstract

The invention provides a method for predicting and selecting the optimum prediction mode in frame and a device hereof; the method comprises that the position of coding block is judged to acquire a judgment result; when the judgment result indicates that the coding block is neither on the leftmost side of the image nor on the top of the image, the prediction modes of the preset number are selected according to the sequence number in ascending order from other prediction modes except the DC prediction one; a first prediction mode with the minimum residual error is selected from the preset number of prediction modes and the mode with the minimum RDcost is selected from the first prediction mode, neighboring prediction modes of the first prediction mode in the prediction direction, the most possible prediction mode and DC prediction mode to be used as the optimum one. The invention could reduce the complexity for realizing intra-frame prediction and accelerate processing speed.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and device for selecting an optimal prediction mode for intra-frame prediction. Background technique [0002] In the existing video coding process, if a block / macroblock (Block / Macroblock) is coded in intra-frame mode, it is necessary to construct a prediction block (PredictionBlock) based on the previously coded and reconstructed block, and the current code will be The block of , subtracts the predicted block before the encoding action is performed. [0003] For luminance samples, it is necessary to calculate the prediction block for each 4x4 sub-block, and a total of 9 prediction modes for 4x4 sub-blocks are given in the prior art, combined below figure 1 with figure 2 Nine prediction modes for 4x4 sub-blocks will be described. [0004] figure 1 Among them, a-p constitutes the 4x4 sub-block that needs to be predicted currently. The samples above and to th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/11H04N19/593
Inventor 季鹏飞
Owner VIMICRO ELECTRONICS CORP
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