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Method for discriminating face at sunshine based on image ratio

A lighting change, face recognition technology, applied in the field of computer vision and pattern recognition

Inactive Publication Date: 2008-03-12
INST OF AUTOMATION CHINESE ACAD OF SCI +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the results of the authoritative face recognition competition FRVT 2002, the current best face recognition system can achieve a recognition rate of about 90% in an indoor environment, while the same system can only achieve a recognition rate of about 50% in an outdoor environment

Method used

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  • Method for discriminating face at sunshine based on image ratio
  • Method for discriminating face at sunshine based on image ratio
  • Method for discriminating face at sunshine based on image ratio

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Embodiment Construction

[0024] Figure 1. The ratio of a face image to its projection in the global illumination subspace will produce an illumination-independent image ratio, the first image is the original image, the second image is the projected image, and the third image is the image with Lighting independent image ratio.

[0025] Figure 2. After the image ratio is obtained in the manner shown in Figure 1, the image of the face under various lighting conditions can be obtained by transforming the projection coefficient

[0026] Figure 3. After statistical learning of the training set, a global illumination subspace will be obtained. The projection of face images A and B in the subspace and the ratio of the original image to the projected image will generate coefficients A, B and image ratios A, b. The composite image of image ratio B and coefficient A will be consistent with the illumination of image A (that is, illumination normalization), and the face image after illumination normalization can ...

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Abstract

The invention introduce a kind of face identify method based on image ratio of the illumination change. The illumination is the main capability bottleneck of the system. It easily change the rate of reflectivity into the rate of illumination condition and two same three-dimensional shape images, to get a kind of face representation method without changing with illumination. It composes the face image under arbitrary illumination condition and achieves the face image illumination integrative or creates abundant training stylebooks. It is suitable for all face identify system to enhance the identify capability in the illumination changing circumstance.

Description

technical field [0001] The invention relates to the fields of computer vision and pattern recognition, in particular to face recognition and image synthesis methods under illumination changes. Background technique [0002] In recent years, biometric identification technology has developed rapidly. Among them, face recognition technology has the advantages of user-friendliness and non-invasiveness compared with other biometric technology. Since 9 / 11, national security has become more and more important. The use of biometric identification technology, especially face recognition technology, can enhance entry and exit control to effectively prevent terrorist attacks. For this purpose, the International Civil Aviation Organization (ICAO) required its 188 member states to start issuing biometric passports by 2010. A biological passport refers to a passport that encapsulates an IC chip containing human biometric information. Biometrics such as face, iris, and fingerprints are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
Inventor 刘俊王阳生
Owner INST OF AUTOMATION CHINESE ACAD OF SCI