Method for encoding H.264 interesting region

A technology of region of interest and coding method, applied in the field of region of interest coding through bit rate control

Inactive Publication Date: 2009-07-29
江苏儒灵童文化产业集团有限公司
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  • Abstract
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Problems solved by technology

Since a frame of H.264 has a maximum of 8 image slices, this method can best encode 7 regions of interest, and it needs to add a flexible

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  • Method for encoding H.264 interesting region
  • Method for encoding H.264 interesting region

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and embodiment the utility model is further described.

[0019] Such as figure 1 As shown, for each frame of image, we calculate the size ratio of the region of interest and the background region on the image according to the specified ROI region, and allocate the region according to the ratio of the bit rate allocation between the ROI region and the background region set in the bit rate control. The number of bits and macroblocks in the area of ​​interest in the image and the number of bits and macroblocks in the background area. At the basic unit level, the code rate control algorithm first determines whether the macroblock of the basic unit is in the region of interest, and then enters the corresponding macroblock level code rate control. The macroblocks in the region of interest adopt the code rate control control of the region of interest , the background area enters the code rate control of the background area, and t...

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Abstract

The present invention relates to a H.264 interested region coding method, specifically to a method of using code rate to control the coding of interested region, including coding methods at three levels of group-level, image-level and basic unit-level. The invention has advantages of using code rate control algorithm to performing the coding of interested region without adding extra information in the code stream, without limitation to the number and shapes of the interested region, and without adding the complexity of coding algorithm. The invention is a more flexible interested region coding method, which can be applied in all Profile of H.264, and has important application value in video monitoring, and the like fields having high requirement to the integral compression ratio; experiments show that the method is an effective H.264 interested region coding method, is suitable for constant code rate control algorithm and variable code rate control algorithm.

Description

technical field [0001] The invention relates to a method for coding an H.264 region of interest, in particular to a method for coding a region of interest through code rate control. Background technique [0002] Region of Interest (ROI) coding can compress the data of the background region as much as possible on the basis of effectively retaining the data of the user's region of interest. As a feature of JPEG2000, it has received more and more attention. H.264 is the latest video coding standard launched by the International Telecommunication Union (ITU: International Telecommunication Union), which integrates many advantages of previous video coders, such as multi-mode selection of I-frame macroblocks, 1 / 4 pixel motion vector, Multiple reference frames, the use of De-blocking technology, etc., these features have greatly improved the coding efficiency of H.264. At all bit rates, H.264 saves 50% of the bit rate compared with H.263, especially at extremely low bit rates, the...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N19/167
Inventor 李恒中夏卫平
Owner 江苏儒灵童文化产业集团有限公司
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