Illumination invariant extracting method for complex illumination face recognition

A face recognition and extraction method technology, applied in the field of face recognition, can solve the problem of unsatisfactory face recognition effect, and achieve the effect of improving the accuracy of face recognition

Inactive Publication Date: 2010-09-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] In order to solve the problem that the face recognition effect of the above method is unsatisfactory under complex illumination conditions, the purpose of the present invention is to propose a more effective illumination invariant extraction method based on multi-scale and multi-directional contour features, so as to improve complex illumination conditions. Recognition Accuracy of Face Recognition

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  • Illumination invariant extracting method for complex illumination face recognition
  • Illumination invariant extracting method for complex illumination face recognition
  • Illumination invariant extracting method for complex illumination face recognition

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] At present, effective illumination invariant extraction methods at home and abroad mainly include: multi-scale Retinex (MSR), self-quotient image (SQI), logarithmic total variation (LTV), and wavelet-based illumination invariant (MFSR) and gradient face ( Gradient faces).

[0024] Such as figure 1 Shown: An illumination invariant extraction method (MCPD for short) for complex illumination face recognition, which can choose different multi-scale profile analysis tools. In the specific implementation process of the present invention, the non-subsampled contourlet transform is used to carry out 3 (the value of parameter k) scales to the image, 4 (the value of parameter 1) m value) directions to obtain the contour information of the image. The specific method is described as follows:

[0025] Step 1: read in the face image;

[0026] Step 2: Perform non-subsampl...

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Abstract

The invention discloses an illumination invariant extracting method for complex illumination face recognition. The method is characterized in that the method comprises the following steps: (1) reading a face image; (2) carrying out multiple-dimensioned and multidirectional contour analysis on the image; (3) solving the multiple-dimensioned and multidirectional contour information of the image; (4) solving the contour information of each dimension of the image; (5) solving the contour direction information of each dimension of the image; (6) solving the main direction of the contour of the image. The invention solves the problem of poor face recognition effect under the complex illumination in the prior art, provides an effective illumination invariant extracting method on the basis of multiple-dimensioned and multidirectional contour feature to enhance the accuracy of the face recognition under the complex illumination; in addition, the method also can be applied to the field of imagesearch.

Description

technical field [0001] The invention relates to illumination invariant feature extraction, multi-scale geometric analysis technology and face recognition technology under complex illumination conditions. Background technique [0002] The problem of the influence of illumination changes on face recognition has attracted the attention of researchers, and a variety of methods have been proposed. These methods can be roughly classified into three categories: illumination standardization, 3D models, and extraction of illumination invariants. Illumination standardization is an early processing method to eliminate the influence of illumination. It refers to the use of basic image processing technology to preprocess the illumination image to obtain an illumination robust image. The method mainly includes: logarithmic transformation, histogram equalization, gamma correction, adaptive histogram equalization and local histogram equalization, etc. Although such methods can eliminate t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46
Inventor 程勇赵春霞
Owner NANJING UNIV OF SCI & TECH
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