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Biopsy method for use in human face identification

A technology of living body detection and face recognition, applied in the field of pattern recognition, which can solve the problem of few living body features and achieve the effect of ensuring concealment

Inactive Publication Date: 2010-12-08
SUN YAT SEN UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the blind detection method is strong concealment and high security, but the disadvantage is that there are few living features that can be used stably and effectively
For example, eye blinking is a commonly used living feature in blind detection methods, but according to statistics, the average person blinks once every 2 to 4 seconds, which is too long, and there are many people who do not blink for a long time

Method used

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  • Biopsy method for use in human face identification
  • Biopsy method for use in human face identification
  • Biopsy method for use in human face identification

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Embodiment Construction

[0027]The present invention takes the application of face detection and recognition based on video as an example to illustrate the specific implementation process of the present invention. The test uses an ordinary 5-megapixel camera, the distance between the camera and the face is about 0.4 meters, and it is in a general indoor lighting environment. The face detection, liveness detection, and recognition systems run on a PC.

[0028] Step 1: The system prompts misleading information

[0029] When the user enters the user name and password and expects to enter the system, a prompt message "Please face the camera frontally" is sent to the user, requiring the user to perform a certain posture correction, regardless of whether the face image captured by the camera is a front view or not.

[0030] Step 2: Adaboost face and eye detection

[0031] After the Adaboost algorithm was proposed, it was introduced for face detection, which greatly improved the speed of face detection. Wi...

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Abstract

The invention provides a biopsy method for use in human face identification and belongs to the technical field of mode identification. The algorithm provided by the invention comprises: firstly, giving a 'please-face-the-camera-with-face' prompt to a user logging in regardless of the current posture of the user, finding the face and eye socket areas by using an Adaboost human face sorter during the posture correction of the user, determining upper and low eyelids and left and right eye corners by using differential projection and precisely framing the positions of the eye sockets; secondly, computing optical flow field of two adjacent frames in an input video sequence by using an LK algorithm; and thirdly, further processing obtained optical flow data to obtain an optical flow amplitude, acquiring the number of the pixels with high amplitude, computing the specific gravity of the pixels with high amplitude, and determining eye movement if the proportion is big. Experiments show that for a real human face, eye movement can be detected easily due to a heavy optical flow generated on the eyes in a posture correction and eye twinkling process, while for a picture, eyes only perform a micro movement no matter how the picture moves or translations. When the method is used for biopsy, a better effect can be obtained.

Description

technical field [0001] The invention belongs to the field of pattern recognition, and in particular relates to a living body detection method based on misleading prompt information and optical flow field applied in face recognition. Background technique [0002] With the development of biometric technology, face recognition technology has become mature. Under good lighting conditions and postures, the face recognition system can already perform face detection and recognition well. However, for some As far as the face recognition technology of other systems is concerned, users can deceive the system with illegal means such as photos. For this type of system, the higher the recognition rate, the greater the security risks. Therefore, liveness detection has become a bottleneck for the application of face recognition technology in such systems. [0003] Liveness detection in traditional face recognition systems can be roughly divided into two methods: user cooperation and blin...

Claims

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Application Information

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IPC IPC(8): G06K9/00A61B5/117A61B5/1171
Inventor 马争鸣李静刘金葵谭恒良
Owner SUN YAT SEN UNIV
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