Method for detecting colour image human face under complex background

A face detection, color image technology, applied in instruments, character and pattern recognition, computer parts and other directions, can solve the problems of low detection rate and high time complexity, and achieve the effect of accurate detection

Inactive Publication Date: 2007-03-21
SHANGHAI JIAO TONG UNIV
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AI Technical Summary

Problems solved by technology

However, when there are multiple side faces and backgrounds close to skin color, the detection rate is not high and the time complexity is high.

Method used

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  • Method for detecting colour image human face under complex background
  • Method for detecting colour image human face under complex background
  • Method for detecting colour image human face under complex background

Examples

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Embodiment Construction

[0063] The 1015 samples in the image database used in this embodiment have a picture resolution of 800×640, and these pictures are all taken under conditions of variable light and complex background. Moreover, the database contains a large number of pictures with large face rotation angles, as well as changes in scale, posture, and expression. The overall detection rate reaches 89.7%. The whole implementation process is as follows:

[0064] 1. Light compensation

[0065] First perform Gamma correction on the input image, and then gray scale stretching

[0066] The Gamma correction defined in this embodiment is:

[0067] new _ pixel _ value = old _ pixel _ value 1 / C G - - - ( 1 ) ...

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Abstract

One method using for picture detecting technology field, is especial a kind of color picture person face detecting method in complicated background. Detect the candidate area of person face using whole complexion and figure character, then detecting person face by eye and mouth local character. Take illumination compensate for pictures and partly eliminate the influence for detecting from illumination, then divide up and unite the two value picture traversed by complexion model to get the candidate area of person face. Detecting person face figure, eye and mouth to judge if the candidate area having the face and finish the face detecting. It can accurately locate face position and the face with large gauche angle. The examine rate is 89.7% for 1015 color face pictures taken in changing illumination and complex background containing gauche ones.

Description

technical field [0001] The invention relates to a method in the technical field of image detection, in particular to a method for face detection in color images under complex backgrounds. Background technique [0002] Face detection is not only the first step in an automatic face recognition system, but also has important applications in surveillance systems, man-machine interfaces, and image retrieval. Since the face is a non-rigid object, and there are problems such as pose, rotation, scale, illumination, occlusion, etc., face detection is still a very difficult problem. The face detection algorithms proposed in recent years can be roughly divided into four categories: ① Knowledge-based methods, this type of algorithm only has a good effect on frontal face detection in simple backgrounds; ② Template matching methods, this type of algorithm cannot Effectively deal with changes in face scale, posture and shape; ③Appearance-based methods; ④Feature-BasedMethods. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
Inventor 姚莉秀田镭李冯
Owner SHANGHAI JIAO TONG UNIV
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