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Surveillance Video Background Image Modeling Method

A technology for monitoring video and background images, used in image analysis, image enhancement, image data processing, etc. The effect of subjective quality

Inactive Publication Date: 2018-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the former will produce obvious smear and optical flow phenomenon, and there is an obvious mismatch between the chroma and brightness components of the image, while the latter has extremely high time complexity

Method used

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  • Surveillance Video Background Image Modeling Method
  • Surveillance Video Background Image Modeling Method
  • Surveillance Video Background Image Modeling Method

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Embodiment

[0068] figure 1 It is a schematic diagram of the inner boundary and outer boundary involved in the boundary detection of the block, assuming that the size of the block is 16, for its Y component, this 16×16 block corresponds to 16 pixels in the four directions The point is its corresponding inner boundary, and its outer boundary in four directions is 16 pixels at the corresponding positions of the four blocks adjacent to this block. When the quantization ratio of the YUV three-component is 4:2:0, the side length of the U and V components is half that of the Y component.

[0069] Take the scheme of dynamically adjusting the block size as an example, such as figure 2 As shown, the general flowchart of background modeling, the specific steps are:

[0070] Start: take frame 1 as the original background frame, and start processing from frame 2;

[0071] Step 201: Carry out block initialization operation according to the size n of the current block; the setting of the block init...

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Abstract

The invention provides a monitoring video background image modeling method, which adopts a block boundary detection method, image residual gradient calculation and self-adaptive training set length adjustment method to ensure excellent subjective quality. The background image modeling method of the present invention is block-based, stores YUV three components at the same time, and the generated background image ensures high-quality consistency of chromaticity and brightness. By using the modeled background image as a global reference image for video encoding, the bit rate can be significantly saved, and a background image for global encoding reference can be established while maintaining subjective quality.

Description

technical field [0001] The invention relates to digital image processing technology, in particular to background image modeling technology. Background technique [0002] Compared with real-time communication scenarios, monitoring scenarios have lower real-time requirements, and the scene basically does not change, and the camera remains relatively stable. Therefore, the background image can be established for a certain length of the training set of the video sequence. Using the established background image as a reference image for subsequent encoding can save a lot of encoding bit rate. The key technology of background image modeling is foreground detection. Commonly used background image modeling methods are pixel-level background subtraction methods or methods based on Gaussian mixture models. However, the former will produce obvious smear and optical flow phenomenon, and there is an obvious mismatch between the chroma and brightness components of the image, while the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/62H04N7/18
CPCG06T2207/10016G06T2207/20081H04N7/18
Inventor 周益民唐钦宇郭江彭凤婷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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