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Iris image quality detection method

A quality detection method and iris image technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems of inability to effectively judge the quality of low-quality iris image sequences, and achieve the effect of improving accuracy and robustness

Active Publication Date: 2018-08-28
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

[0003] The invention provides a method for detecting the quality of iris images, which solves the problem that the existing methods cannot effectively judge the quality of the low-quality iris image sequences captured under the complex environment imaging conditions recognized in long-distance movement

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[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0039] Iris recognition has become a key research direction and development trend in the field of biometrics due to its significant advantages such as accuracy, stability, safety and non-contact. In order to improve the degree of freedom and recognition of users, and promote the popularization and promotion of iris recognition technology, the application scenarios...

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Abstract

The invention discloses an iris image quality detection method to solve the problem that a current method cannot be used for effectively judging the quality of a low-quality iris image sequence. The method comprises the following steps: obtaining an iris image sequence, calculating an overall definition index, and allocating quality weights; calculating an iridal local definition index; calculating an iridal availability index; calculating an iridal neighbourhood contrast ratio index; carrying out normalization processing on the overall definition index, the iridal local definition index, theiridal availability index and the iridal neighbourhood contrast ratio index of each frame image of the iris image sequence; calculating the combined quality score of the iris image sequence, and evaluating the availability of the iris image sequence. According to the iris image quality detection method, the image quality evaluation of complex environment imaging identified in remote-distance movement is realized.

Description

technical field [0001] The invention relates to the field of image quality evaluation, in particular to an iris image quality detection method. Background technique [0002] The current iris image quality evaluation method mainly takes a single frame of iris image as the object, and calculates the iris area availability, iris / sclera contrast, iris / pupil contrast, iris size, pupil expansion ratio, overall gray level and sharpness and other indicators. , combined to obtain an iris image quality score, and compare the quality score with the reference score to determine whether the quality requirements for system recognition are met. This type of method has obvious shortcomings when used in mobile iris recognition: long-distance mobile iris recognition systems The imaging frame frequency of the system is high, and the correlation of adjacent frame image sequences is relatively large. If the image quality is judged frame by frame, the efficiency is low, which will affect the real...

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Application Information

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IPC IPC(8): G06T7/00G06T7/42
CPCG06T7/0012G06T2207/30041G06T2207/30168G06T7/42
Inventor 郭慧杰韩一梁杨昆王超楠杨倩倩
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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