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Method and device for detecting crowd gathered region

A technology of gathering areas and detection methods, applied in character and pattern recognition, instruments, computer parts, etc., can solve problems such as many false positives

Active Publication Date: 2015-01-07
SHENZHEN COSON ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the technical problem to be solved by the present invention is to provide a method and device for detecting a crowd gathering area to solve the technical problem that a fixed area needs to be manually set in the monitoring screen and there are many false alarms

Method used

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  • Method and device for detecting crowd gathered region
  • Method and device for detecting crowd gathered region
  • Method and device for detecting crowd gathered region

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] like figure 1 As shown, a method for detecting a crowd gathering area provided by an embodiment of the present invention includes the following steps:

[0061] S101. Sampling an input video image and performing preprocessing to obtain a grayscale image.

[0062] Specifically, the video image is acquired from the video acquisition device, the video image is down-sampled, the down-sampled color image is converted into a grayscale image, and pre-processing such as filtering and noise removal is performed.

[0063] S102. Use a preset multi-scale rectangular window to traverse the grayscale image, and use a classifier to roughly locate a densely populated area.

[0064] In this step, the grayscale image can be traversed separately by presetting multiple small-scale rectangular windows. For example, the preset initial small-scale rectangular window has a size of 100*100 pixels, and the window moving step is 2 pixels. Each traversal After finishing an image, the scale of the...

Embodiment 2

[0078] like image 3 As shown, a method for coarse positioning of a crowded area provided by a preferred embodiment of the present invention includes the following steps:

[0079] S301. Traversing the rectangular window from the upper left corner of the image.

[0080] Specifically, before this step, the color image obtained by the video acquisition device is down-sampled, and the color image is down-sampled to a preset scale (320*240 is used in the embodiment of the present invention) and then converted into a grayscale image; then use Gaussian filters filter grayscale images to remove noise. In this step, use a small-scale rectangular window to slide in the grayscale image, from left to right, from top to bottom, of course, you can also slide in other directions, as long as the entire image can be traversed. In the embodiment of the present invention, the initial size of the rectangular window is 100*100 pixels, and the moving step of the window is 2 pixels.

[0081] S302...

Embodiment 3

[0103] like Figure 4 As shown, a method for fine positioning of a crowded area provided by a preferred embodiment of the present invention includes the following steps:

[0104] S1031. According to the location of the crowded area, intercept the corresponding image of the crowded area from the input color image.

[0105] In this step, according to the positions of the densely-crowded areas roughly positioned, images of these positions are intercepted from the input color image as candidate crowd-gathering areas.

[0106] S1032. Scale the image of the densely populated area to a preset size, and convert it into a grayscale image to obtain a grayscale image of the densely populated area.

[0107] In this step, the color image of the candidate crowd gathering area is converted into a grayscale image, and the scale of the grayscale image is uniformly scaled to a specified size, which is convenient for feature extraction. In the embodiment of the present invention, the size of t...

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Abstract

The invention discloses a method and device for detecting a crowd gathered region, and belongs to the technical field of video processing. The method includes the steps that input video images are sampled and preprocessed, and then a grey-scale map is obtained; the grey-scale map is traversed through a preset multi-scale rectangular window, and a crowd dense region is coarsely positioned through a classifier; when the crowd dense region exists, the crowd gathered region is finely positioned in the crowd dense region according to crowd density. By the adoption of the method and device for detecting the crowd gathered region, the crowd dense region can be automatically positioned, and the position of the region does not need to be manually set; meanwhile, the crowd regions are coarsely positioned and finely positioned through two layers of screening mechanisms, the crowd gathered region can be accurately acquired, in addition, due to the fact that a background subtraction method is not adopted, the influences of factors of the outer side are eliminated, and crowd gathered events can be accurately positioned even under the complex scene conditions.

Description

technical field [0001] The invention relates to the security field, in particular to a method and device for detecting a crowd gathering area. Background technique [0002] With the rapid development of social economy, my country's urbanization process continues to advance, the number of urban population is increasing, the public transportation, living facilities and other areas of the city often usher in short-term peak flow of people, the high degree of crowding brings If some potential safety hazards cannot be evacuated in a timely and effective manner, it is easy to cause major accidents, such as trampling and other dangerous accidents. At the same time, the rapid growth of the population is also likely to lead to some group incidents, such as mobs, group fights, etc., which pose a greater threat to the public security of the city. [0003] In order to detect sudden crowd gathering events in time, a video surveillance system was introduced. However, the traditional vide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/62
CPCG06V20/53G06F18/2148
Inventor 叶必锭吴金勇王军
Owner SHENZHEN COSON ELECTRONICS
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