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Quick 4*4 block intra-frame prediction mode selecting method

A technology of intra-frame prediction mode and prediction mode, which is applied in the field of digital video coding to achieve the effects of good rate-distortion efficiency, saving coding complexity, and high coding efficiency

Inactive Publication Date: 2010-11-24
HANGZHOU DIANZI UNIV
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Problems solved by technology

The computational complexity of this method is unacceptable for real-time encoders

Method used

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  • Quick 4*4 block intra-frame prediction mode selecting method
  • Quick 4*4 block intra-frame prediction mode selecting method
  • Quick 4*4 block intra-frame prediction mode selecting method

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Embodiment Construction

[0030] A fast 4x4 block intra prediction mode selection method, the specific steps are as follows:

[0031] Step (1) divide a picture into 4x4 block images according to the H.264 encoder framework, calculate seven edge direction coefficients of each 4x4 image block; divide each 4x4 image block into nine kinds of edges according to the edge direction coefficients Mode: including a consistent area block edge mode and eight different direction edge modes; the method of calculating the seven edge direction coefficients of each 4x4 image block is as follows:

[0032]

[0033]

[0034]

[0035]

[0036]

[0037]

[0038]

[0039] Among them, H, V, X, A, B, C, and D represent seven edge direction coefficients respectively, and S 00 , S 01 , S 10 , S 11 Respectively represent the average value of the upper left, upper right, lower left, and lower right quarter of a block of pixels, u, v=0, 1, i, j are the index values ​​of a quarter block of pixels;

[0040]...

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Abstract

The invention relates to a quick 4*4 block intra-frame prediction mode selecting method. The method comprises the following steps of: dividing a picture into 4*4 block images by using an H.264 coder frame, and calculating seven edge directional coefficients of each 4*4 block; dividing each 4*4 image block into nine edge modes comprising one consistent regional block edge mode and eight different directional edge modes according to the edge directional coefficients; then selecting one or three intra-frame prediction modes according to the edge modes of the image block, and if the three prediction modes are selected, determining a final intra-frame prediction mode according to the calculated rate distortion cost value after pre-coding; and if only one prediction mode is selected, taking the prediction mode as the final prediction mode. The method quickly determines the 4*4 block intra-frame prediction mode of the H.264 under the condition of low calculation complexity, and ensures good rate distortion efficiency.

Description

technical field [0001] The invention belongs to the field of digital video coding, and relates to a fast 4x4 block intra-frame prediction mode selection method based on an H.264 coder. Background technique [0002] In the latest video compression standard H.264 encoder, intra-frame and inter-frame coding adopt a variety of coding mode options. In the intra prediction coding mode, the H.264 encoder supports 4 Intra_16x16 prediction modes and 9 Intra_4x4 prediction modes for luma components, and supports 4 Intra_8x8 prediction modes such as Intra_16x16 for chrominance blocks. Among the 9 prediction modes for 4x4 small blocks, the Intra_4x4_DC mode uses the average value of several decoded area pixels adjacent to the 4x4 small block to make predictions for this small block; the other 8 prediction modes correspond to 8 different direction angles for prediction. In the H.264 video coding process, the process of selecting a suitable prediction mode from many coding modes is call...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/11H04N19/147
Inventor 王向文
Owner HANGZHOU DIANZI UNIV
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