Method for searching human face remarkable characteristic and human face comparison method

A feature point and salient technology, which is applied in the field of searching for face salient feature points, can solve the problems of large face data, speed and accuracy limitations of face comparison, etc., and achieve the effect of improving comparison accuracy and speed

Inactive Publication Date: 2008-12-17
SHANGHAI ISVISION INTELLIGENT RECOGNITION TECH
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AI Technical Summary

Problems solved by technology

[0002] In face recognition technology, usually the face to be recognized is compared with the face stored in the face database to identify the identity of the face to be recognized, but due to the large number of faces stored in the face database, Moreover, the data contained in each face is relatively large, which limits the speed and accuracy of face comparison.

Method used

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  • Method for searching human face remarkable characteristic and human face comparison method

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Embodiment Construction

[0011] see figure 1 , the method for searching the salient feature points of human face of the present invention at least includes the following steps:

[0012] S10: Convert the face image to be searched into a grayscale image to form a grayscale image of the face. The principle and method of the conversion are known to those skilled in the art, and will not be repeated here. Usually, for the convenience of searching, generally The face grayscale image is normalized so that the size of the image is normalized to 64×68, and some preprocessing is performed accordingly to make the facial features of the image clearer.

[0013] S11: Divide the gray-scale image of the human face into a plurality of search sub-areas, and record the average gray-scale of each search sub-area, usually divide the gray-scale image of the human face into left cheek sub-area, right cheek sub-area, The chin sub-area, the left half of the forehead sub-area and the right half of the forehead sub-area can ef...

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Abstract

The invention relates to a method for searching marked human facial features and a method for comparing human faces. Gray difference exists between obvious features such as moles, color mottles, birth marks, etc., on a human face and the color of surrounding skin, so that a human face to be searched is firstly converted into a gray-scale map so as to form a human face gray-scale image when the obvious features are searched. The human face gray-scale map is divided into a plurality of searching sub-areas to improve the searching precision; average gray-level of each searching sub-area is recorded; each searching sub-area is searched; the image gray-scale of each searching point is calculated; and the calculated image gray-scale for each time and the average gray-scale of corresponding searching sub-area are compared to determine whether the corresponding searching point is the obvious feature of the human face. Therefore, the obvious features can be effectively searched. In addition, the comparison range can be reduced based on whether the human face has obvious feature during the process of comparison, thereby greatly improving the comparison speed and precision.

Description

technical field [0001] The invention relates to a method for searching prominent feature points of human faces and a method for comparing human faces. Background technique [0002] In face recognition technology, usually the face to be recognized is compared with the face stored in the face database to identify the identity of the face to be recognized, but due to the large number of faces stored in the face database, Moreover, each face contains relatively large data, which limits the speed and accuracy of face comparison. [0003] However, many people have moles on their faces, and moles are not affected by factors such as age, posture, and expression. At the same time, from the perspective of human cognition, moles and other characteristics are easier to accept in real life , how to apply this feature to portrait comparison has become an urgent technical issue for those skilled in the art. Contents of the invention [0004] The purpose of the present invention is to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46
Inventor 赵文忠
Owner SHANGHAI ISVISION INTELLIGENT RECOGNITION TECH
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