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Method for detecting mask faces in video monitor

A technology of video monitoring and detection methods, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., and can solve the problems that mask camouflage cannot be prevented, and facial details of human faces are not analyzed.

Active Publication Date: 2012-08-01
CHENGDU JIAYITONG INFORMATION TECH CO LTD
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Problems solved by technology

In Estimating the Number of People in Crowded Scenes by MID Based Foreground Segmentation and Head-shoulder Detection by Min Li, Zhaoxiang Zhang, etc., according to the shape features formed by the head and shoulders, a head detection method based on the gradient direction histogram hog is proposed, which can be compared with Accurate head detection, but does not analyze the facial details of the face, which cannot prevent illegal acts of masking and camouflage

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  • Method for detecting mask faces in video monitor
  • Method for detecting mask faces in video monitor
  • Method for detecting mask faces in video monitor

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Embodiment Construction

[0098] The invention provides a masked face detection method in video surveillance, the system structure block diagram of the method is as follows figure 1 As shown, it includes a video acquisition unit, a mask detection unit and an alarm unit.

[0099] The main function of the video acquisition unit is to shoot the monitoring scene through a general analog camera and obtain analog video images, and then convert them into digital image data through a general video acquisition card. Here, there are certain requirements for the installation height and angle of the camera. The installation of the camera should make the head and shoulders of the human body appear in the video screen. Faces are the best, so the camera is required to take close-up frontal shots.

[0100] The main function of the mask detection unit is to convert the incoming color digital image data into a grayscale image, and then detect whether there is a masked face on the grayscale image. In order to improve th...

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Abstract

The invention relates to a method for detecting mask faces in a video monitor, which aims to solve the problem that illegal actions of masks cannot be prevented by adopting a traditional video monitoring system. The method for detecting the mask faces in the video monitor comprises the following steps of: a-, converting a color video image acquired from a monitoring site into a gray level image; b-, performing scaling on the gray level image; c-, performing head detection on the gray level image; d-, performing interframe matching on every head when the heads appear; e-, performing face detection on the heads; and f-, performing a mask judgment, marking an original color video image judged to have the mask faces, and giving an alarm.

Description

Technical field: [0001] The invention relates to the fields of image processing and pattern recognition, in particular to a face detection method in video surveillance. Background technique: [0002] Face detection in video surveillance is to detect the face from the background of the video image. Due to the influence of image background, brightness changes and other factors, face detection has become a complex research topic. At present, the cascaded AdaBoost method training recognition method based on Haar features is considered to be the most mature and effective face detection method. A masked face, such as wearing sunglasses or a mask, is a special kind of face. Compared with traditional face detection, this kind of special face detection has different characteristics and has a similar process, but not all the same. The ideal situation of mask detection is that no complete face image is detected on the head, so face detection based on head detection has become the main...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/62
Inventor 师改梅胡入幻白云杨云缪泽补建罗安周聪俊
Owner CHENGDU JIAYITONG INFORMATION TECH CO LTD
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