H.264/advanced video coding (AVC)-standard-based intra-frame prediction mode rapid selection method and device

A technology of intra-frame prediction mode and prediction mode, which is applied in the field of multimedia video coding, and can solve the problems of high complexity of prediction algorithms

Active Publication Date: 2012-02-29
WUHAN TIANYU INFORMATION IND
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Problems solved by technology

Therefore, the complexity of the H.264 intra prediction algorithm is very high

Method used

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  • H.264/advanced video coding (AVC)-standard-based intra-frame prediction mode rapid selection method and device
  • H.264/advanced video coding (AVC)-standard-based intra-frame prediction mode rapid selection method and device
  • H.264/advanced video coding (AVC)-standard-based intra-frame prediction mode rapid selection method and device

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[0073] Refer below figure 1 and figure 2 Describe in detail the method for quickly selecting an intra prediction mode based on the H.264 / AVC standard provided by the present invention; as shown in the figure, the implementation of a fast selection process for an intra prediction mode based on the H.264 / AVC standard in this embodiment mainly includes the following step:

[0074] In the step of determining the prediction mode type, calculate the SDM value of the current brightness macroblock, and compare it with the preset flatness coefficient double thresholds T1 and T2, if the SDM value is greater than T2, only the following 4× 4. Prediction mode selection step, if the SDM value is less than T1, then only perform the following 16×16 prediction mode selection step, if neither of the above two, then perform the following best prediction mode selection step;

[0075] In the 4×4 prediction mode selection step, RDO operation is performed on the current prediction block according...

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Abstract

The invention discloses an H.264/advanced video coding (AVC)-standard-based intra-frame prediction mode rapid selection method, which comprises prediction mode type determination step and specifically comprises the following steps of: calculating a sum of different with mean (SDM) value of a current brightness macro block, comparing the SDM value with two preset flatness coefficient threshold values T1 and T2, performing a rate distortion optimization (RDO) operation on a current prediction block according to a preset 4*4 prediction mode algorithm to obtain a first optimal prediction mode if the SDM value is more than T2, and performing the RDO operation on the current prediction block according to a preset 16*16 prediction mode algorithm to obtain a second optimal prediction mode; and calculating the first and second optimal prediction modes and selecting a mode with the lowest RDO value as a third optimal prediction mode if the SDM is neither more than T2 nor less than T1. The invention also discloses a corresponding H.264/ AVC-standard-based intra-frame prediction mode rapid selection device. By the method and the device, a calculated amount can be decreased, operation time can be shortened, an intra-frame prediction process can be accelerated and coding speed can be increased under the condition of ensuring that a coding output signal to noise ratio and a code rate are invariable.

Description

technical field [0001] The present invention relates to multimedia video coding technology, in particular to a method and device for quickly selecting an intra-frame prediction mode based on the H.264 / AVC standard. Background technique [0002] H.264 is a video coding standard developed by the Joint Video Team (JVT / Joint Video Team) of the Video Coding Experts Group (VCEG) of ITU-T and the Moving Picture Experts Group (MPEG) of ISO / IEC. It is equivalent to the tenth part of ISO's MPEG-4, officially approved in May 2003. Compared with traditional video coding methods, the H.264 standard has some significant advantages such as high compression efficiency and good network performance. In terms of Peak Signal-to-Noise Ratio (PSNR) and video quality, H.264 is far superior to other existing standards. Of course, the algorithm complexity of H.264 is also high. [0003] The H.264 standard uses 16×16 luminance macroblocks and 8×8 chrominance macroblocks as the basic unit of encodi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/32H04N19/122H04N19/159
Inventor 许元锎
Owner WUHAN TIANYU INFORMATION IND
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