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Rapid reading method of motion compensating data based on H.264 standard

A standard motion and motion compensation technology, applied in the field of H.264 standard video decoding processing, to improve decoding efficiency and save pressure

Inactive Publication Date: 2010-02-24
SICHUAN PANOVASIC TECH
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Problems solved by technology

Therefore, if real-time decoding of high-definition digital video is to be achieved, it will bring huge pressure to the data transmission bus responsible for transmitting off-chip data to the on-chip

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  • Rapid reading method of motion compensating data based on H.264 standard
  • Rapid reading method of motion compensating data based on H.264 standard

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Embodiment

[0020] This example takes 4×8 sub-block division as an example to illustrate the technical solution of the present invention, and its system flow is as follows figure 1 , the 4×8 sub-block segmentation type needs to read in the schematic diagram of pixels as shown in figure 2 .

[0021] First, when the system is started, generate a comparison table of the sub-block segmentation type and the reference frame data matrix that should be read accordingly, as shown in Table 1, and store it in the system for later use. When receiving a macroblock that needs to be motion compensated , the current sub-block segmentation type is analyzed by the code stream analysis unit of the H.264 standard. If the current sub-block segmentation type that needs to be interpolated is in 4×8 format, it can be obtained by looking up Table 1. The size of the reference frame data that needs to be read It is a 9×13 matrix, so the DMA controller will read the pixel data of the integer pixel positions of the...

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Abstract

The invention relates to the technology of video coding processing and provides a fast data reading method based on H.264 standard motion compensation. The technical proposal of the method is that: the fast data reading method based on the H.264 standard motion compensation comprises the steps as follows: a. a sub-block segmentation type and a corresponding reference frame data matrix comparison list are generated when a system is started; b. the code of the current macroblock type is analyzed and the type of the segmentation of the current sub-block is obtained; c. the reference frame data matrix scale that needs to be read is obtained after the list is checked, and a DMA controller is informed; d. the DMA controller transmits the reference frame data into the in-chip cache from an out-of-chip memory cell; e. a motion compensation unit carries out coding motion compensation calculation by visiting the reference frame data in the in-chip cache. The method of the invention has the advantages of greatly improving data access efficiency and reducing bus pressure and is suitable for a video decoding system that adopts H.264 standard.

Description

technical field [0001] The invention relates to a video coding processing technology, in particular to a video decoding processing technology of the H.264 standard. Background technique [0002] With the widespread application of digital TV, network video streaming and DVD technology, video compression has become the most basic part of broadcast and entertainment media. The success of digital TV and DVD was built on the MPEG-2 standard more than a decade ago. This standard once proved to be very practical, but now it seems that it has become a bit outdated. There is a clear trend to replace MPEG-2 with more efficient, more practical technologies that make good use of the increased processing power. More promising recently is the international standard MPEG-4 and H.264. The H.264 standard is dedicated to traditional applications with a narrower range than the MPEG-4 standard, focusing on efficient compression of rectangular video images captured by ordinary cameras and vide...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/50H04N19/51
Inventor 鲁国宁袁梓瑾莫启会毛夏飞
Owner SICHUAN PANOVASIC TECH
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