Method for recognizing iris based on edge gradient direction pyramid histogram
An edge gradient, iris recognition technology, applied in character and pattern recognition, instruments, computing and other directions, to achieve high efficiency and meet the requirements of efficiency
Active Publication Date: 2011-09-21
厚普清洁能源(集团)股份有限公司
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[0008] The above algorithms cut into feature extraction from different angles, and each has advantages, disadvantages and scope of application
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[0046] The present invention adopts the above technical scheme, utilizes the matlabe development environment and the CASIA iris library, and realizes the whole algorithm. Among them, all algorithms in the iris system from image acquisition to normalization process adopt the algorithm proposed by Mr. Daugman. Finally, the inter-class similarity and intra-class similarity are obtained through batch processing, and the ROC curve is drawn. Its performance is better than Daugman's method, and at the same time, the algorithm efficiency is much higher than other existing algorithms.
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The invention discloses a method for recognizing an iris based on an edge gradient direction pyramid histogram and belongs to the technical field of computer image processing. The method comprises the following steps of: performing denoising and gray correction on a normalized iris image based on an iris sample image and an iris image to be recognized; extracting edge pixel points and reserving strong edge points by using sobel operators in the horizontal direction and vertical direction; dividing the edge points into eight types according to the gradient directions of the edge points; mapping an edge graph into a multi-resolution multi-dimensional histogram set; calculating correlation quantity of two histogram sets of the iris sample image and the iris image to be recognized according to a pyramid matching kernel formula so as to acquire similarity of the two iris images; and finally, judging whether the iris image to be recognized is consistent with the iris sample image according to a similarity threshold. By the method, an ideal recognition rate can be acquired, and operation time of characteristic extraction and recognition is greatly reduced; and the method has great significance for embedded application of iris recognition.
Description
technical field [0001] The invention belongs to the technical field of computer image processing, and relates to iris feature extraction and recognition technology. Background technique [0002] Biometric identification technology is a solution that uses automatic technology to measure the characteristics of the body or the behavior characteristics of individuals for identity verification, and compares these characteristics or characteristics with the template data in the database to complete the authentication. Nowadays, the iris has been recognized as a personal identification mark. It is inherent, not easy to be lost, not easy to be damaged, and easy to identify. It is an ideal means of identity authentication in high-security applications. Compared with other identification technologies, iris recognition The technology has higher accuracy, and statistics show that the error rate of iris recognition is the lowest among various biometrics. As one of the most popular techn...
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Inventor 解梅严有波
Owner 厚普清洁能源(集团)股份有限公司