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Method, device and system for regional division/coding of image

An image area, image technology, applied in the field of video coding, can solve the problem of inability to accurately divide the foreground and background of graphics, and achieve the effect of improving subjective quality

Inactive Publication Date: 2010-11-10
SHENZHEN TEMOBI SCI &TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to propose a method for dividing an image area, aiming at solving the problem that the prior art cannot accurately divide the foreground and the background of graphics

Method used

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  • Method, device and system for regional division/coding of image
  • Method, device and system for regional division/coding of image

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Experimental program
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Embodiment 1

[0035] figure 2 It is a flowchart of a method for dividing an image area according to an embodiment of the present invention, and the method includes the following steps:

[0036] S101. Extract a motion vector of each macroblock of each image frame in a video sequence.

[0037] The specific method is as follows: analyze the spatial continuity of the macroblock of the image, calculate the motion vector (MVX, MVY) of the current macroblock according to the absolute difference sum after the motion prediction SATD (Sum of Absolute Transform Difference) transformation, and Store it down.

[0038] S102. Make statistics on the motion vectors of the current frame, and calculate the number of identical motion vectors.

[0039] The specific method is as follows: in step S101, the motion search range in the X-axis direction is [-h, h), and the motion search range in the Y-axis direction is [-v, v). Let the matrix M be a 2h×2v motion vector statistical matrix:

[0040] ...

Embodiment 2

[0072] Such as Figure 6 Shown is a structural diagram of an image region division device according to an embodiment of the present invention. The device consists of the following parts:

[0073] The macroblock motion vector extraction module is used to extract the motion vector of each macroblock of each frame image in the video sequence;

[0074] The macroblock motion vector statistics module is used to count the motion vectors of the current frame and calculate the same MV quantity;

[0075] The macroblock motion vector complex area processing module is used to mark and extract the relatively complex area of ​​the macroblock motion vector in the current frame, further accurately judge the divided image according to the spatial correlation and temporal correlation of the macroblock, and divide its regions of interest and regions of non-interest. The macroblock motion vector complex area processing module includes a preliminary processing module and an optimization process...

Embodiment 3

[0078] The embodiment of the present invention also provides an image region coding method. The method includes the steps included in the method of Embodiment 1, and also includes the step of: performing video coding with different qualities according to the finally divided foreground and background, and interested Regions are coded with smaller quantization parameters to improve video quality, and non-interest regions are coded with higher quantization parameters to balance the overall bit consumption.

[0079] The embodiment of the present invention extracts the motion vector of the image in the video sequence, judges the image as the region of interest or the non-interest region according to the complexity of the motion vector, and divides the image according to the spatial correlation and temporal correlation of the macroblock Further accurate judgment is made, so as to accurately divide the foreground and background areas of the image. Use a smaller quantization parameter...

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Abstract

The invention discloses a method, a device and a system for regional division / coding of an image. By extracting a motion vector of the image in a video sequence, judging the image as an interest region or a non-interest region according to the complexity of the motion vector, and performing further accurate judgment on the image after regional division according to spatial correlation and temporal correlation of a macro block, the accurate division of a foreground region and a background region is performed on the image. A smaller quantization parameter is adopted for the interest region to improve the quality of a video, and a higher quantization parameter is adopted for the non-interest region to balance the overall bit consumption to be unchanged, and finally achieve the effect of improving the subjective quality of the video.

Description

technical field [0001] The present invention relates to the field of video coding, in particular to an image region division / coding method, device and system. Background technique [0002] In the face of a complex scene, the Human Visual Attention System (HVS, human visual system) can quickly focus on a few prominent visual objects and prioritize them. This process is called visual attention. A visual object is called a region of interest (ROI). Under the effect of this mechanism, HVS reasonably allocates the limited information processing resources, so that the visual perception process has the ability of selection. It can be seen that not all regions of the entire image are equally important to the subjective quality of the image, and the subjective quality of the image is more determined by the quality of the region of interest in the image. ROI detection has great application value for many image analysis, among which several prominent application directions include: i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/20G06T9/00
CPCH04N19/00151G06T2207/20021G06T7/2006H04N19/0026G06T2207/10016H04N19/0009G06T2207/20144H04N19/00157H04N19/17G06T7/194G06T7/215H04N19/124H04N19/139H04N19/14
Inventor 张智雄
Owner SHENZHEN TEMOBI SCI &TECH
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