Face illumination invariant feature extraction method by utilizing logarithm transformation and Laplacian operator

A technology of constant illumination and logarithmic transformation, applied in the field of pattern recognition, can solve the problems of reducing the recognition rate of faces, and achieve the effect of fast recognition speed, simple method and high recognition rate

Inactive Publication Date: 2017-07-07
CHONGQING THREE GORGES UNIV
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Problems solved by technology

Illumination changes cause large differences in the gray distribution of faces, which reduces the face recognition rate and has a key impact on face recognition. Reducing and eliminating this effect is one of the main difficulties in face recognition technology.

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  • Face illumination invariant feature extraction method by utilizing logarithm transformation and Laplacian operator
  • Face illumination invariant feature extraction method by utilizing logarithm transformation and Laplacian operator
  • Face illumination invariant feature extraction method by utilizing logarithm transformation and Laplacian operator

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[0026] The technical solution of this patent will be further described in detail below in conjunction with specific embodiments.

[0027] see Figure 1-4 , a face illumination invariant feature extraction method using logarithmic transformation and Laplacian operator, comprising the following steps:

[0028] (1) Transform the original image into the logarithmic domain;

[0029] (2) In the logarithmic domain, use the Laplacian operator to sharpen the face, extract the horizontal detail features of the face, and eliminate the slowly changing face illumination. The result is that the face illumination that needs to be extracted is not change features.

[0030] According to the light reflection model, any grayscale face image I(x,y) is the product of the reflection component R(x,y) and the light component L(x,y), that is, I(x,y)=R(x,y) y) L(x, y); in the step (1), the face image is logarithmically transformed, so that its reflection component and illumination component are conv...

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Abstract

The invention discloses face illumination invariant feature extraction method by utilizing logarithm transformation and a Laplacian operator. The method comprises the following steps that a face image is transformed to a log domain; and the Laplacian operator is used to sharpen the face image, detail features of the face are extracted, a face illumination component is eliminated, and an obtained result refers to a face illumination invariant feature which needs extracting. According to the method of the invention, illumination of different angles can be inhibited to certain extent, and the identification rate of the processed face image is higher than the face identification rate processed by a present algorithm; illumination processing is carried out on the face image by utilizing the logarithm transformation and the Laplacian operator, the method is simple and the identification speed is high.

Description

technical field [0001] The invention relates to the technical field of pattern recognition, in particular to a face illumination invariant feature extraction method using logarithmic transformation and Laplacian operator. Background technique [0002] In recent years, face recognition technology has attracted more and more people's attention and developed rapidly, gradually becoming a hot research field. It is a research hotspot in the field of pattern recognition and image processing, and has a wide range of applications in criminal investigation, public security, and other fields. However, posture, expression, and illumination changes are several key factors affecting the performance of the face recognition system, among which illumination changes are particularly serious. Illumination changes cause large differences in the gray distribution of faces, which reduces the face recognition rate and has a key impact on face recognition. Reducing and eliminating this effect is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46
CPCG06V10/60
Inventor 聂祥飞王元元何雪熊文怡杨志军
Owner CHONGQING THREE GORGES UNIV
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