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Quick luminance 4*4 block intra-frame forecasting mode selecting method for H.264 encoding

A technology of intra-frame prediction mode and prediction mode, which is applied in the direction of television, electrical components, digital video signal modification, etc., and can solve problems such as limiting application and increasing time.

Active Publication Date: 2012-04-11
HARBIN INST OF TECH
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Problems solved by technology

While improving the encoding compression efficiency, it also greatly increases the complexity and computation of encoding, increases the time required for encoding, and limits its application in the field of real-time encoding.

Method used

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  • Quick luminance 4*4 block intra-frame forecasting mode selecting method for H.264 encoding
  • Quick luminance 4*4 block intra-frame forecasting mode selecting method for H.264 encoding
  • Quick luminance 4*4 block intra-frame forecasting mode selecting method for H.264 encoding

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specific Embodiment approach 1

[0029] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. A method for fast selection of intra-frame prediction modes for brightness 4×4 blocks applied to H.264 encoding, which is implemented by the following steps:

[0030] Step 1. Calculating the important values ​​of the 9 prediction modes in the 4×4 block frame, and generating the histograms of the 9 prediction modes according to the obtained important values ​​of the 9 prediction modes;

[0031] Step 2. Select the three prediction modes Mx, My and Mz with the largest amplitudes from the histograms of the nine prediction modes obtained in step one, and mark the amplitudes of the three prediction modes as hist_Mx, hist_My and hist_Mz; where (hist_Mx is greater than or equal to hist_My; hist_My is greater than or equal to hist_Mz);

[0032] Step 3. Judging whether the amplitude hist_Mx is less than the preset No. 1 threshold value, if the judgment result is yes, then execute step 31; if the judgment result is no, then exec...

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Abstract

The invention provides a quick luminance 4*4 block intra-frame forecasting mode selecting method for H.264 encoding and relates to a quick luminance 4*4 block intra-frame forecasting mode selecting method. The method is used for quickly selecting a 4*4 block intra-frame forecasting mode so as to promote encoding efficiency of H.264 encoding. Under a condition of analyzing a fundamental principle and a corresponding forecasting formula of intra-frame 4*4 block forecasting, different weighting coefficients of adjacent pixels in a whole forecasting block under different forecasting modes are acquired. Most pixels in the whole forecasting block are determined by a plurality of adjacent pixels with bigger weighting coefficients. According to the characteristic, a new quick luminance 4*4 block intra-frame forecasting mode selecting algorithm based on current pixel distribution is provided. The algorithm is integrated into H.264, thereby being capable of efficiently promoting the efficiency of H.264 intra-frame forecasting under a condition of encoding quality with smaller loss, and further promoting the encoding efficiency of H.264. The quick luminance 4*4 block intra-frame forecasting mode selecting method for H.264 encoding can meet the requirement of the application field higher in real-time demand.

Description

technical field [0001] The invention relates to a method for quickly selecting an intra-frame prediction mode. Background technique [0002] Due to the limitation of storage space and transmission bandwidth, video files need to be compressed and encoded before storage and transmission. With the development of multimedia technology at any time, the requirements for the compression efficiency of video compression coding algorithms are also getting higher and higher. As a high-performance video coding technology, H.264 has been rapidly developed and applied in the field of digital video communication due to its superior video compression ratio. Compared with MPEG-2 and MPEG-4 technology, H.264 technology can greatly reduce the amount of data in the process of transmission and storage under the same image quality, thereby reducing transmission bandwidth and storage space. [0003] H.264 eliminates the intra-frame redundancy of the video sequence through intra-frame prediction....

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/11
Inventor 王进祥刘英哲付方发
Owner HARBIN INST OF TECH
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