Method for deblurring iris image

An iris image and deblurring technology, which is applied in image enhancement, image data processing, character and pattern recognition, etc., can solve the problems of inaccurate image noise modeling and unsatisfactory image deblurring effect

Active Publication Date: 2012-07-04
INST OF AUTOMATION CHINESE ACAD OF SCI
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Finally, due to the inaccuracy of point spread function estimation and

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  • Method for deblurring iris image
  • Method for deblurring iris image
  • Method for deblurring iris image

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[0055] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the present invention, rather than limiting it in any way.

[0056] The present invention proposes a method for deblurring iris images. The method proposed by the present invention is completely realized by computer software, without improving hardware equipment, and can be used in various iris image recognition systems. The flow chart is as follows figure 1 shown, including the following steps:

[0057] Step S1, analyzing the input iris image, judging that the blur of the iris image belongs to defocus blur or motion blur, and then initializing a point diffusion function according to the judging result;

[0058] Ste...

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Abstract

The invention discloses a method for deblurring an iris image, which comprises the following steps of: a step S1, analyzing the input iris image, judging blur of the iris image belongs to defocus blur or motion blur and initializing according to a judging result to obtain a point spread function; a step S2, selecting the gradient of the input iris image so that the point spread function can be more effectively estimated on a selected gradient map, and further modifying the initialized point spread function on the basis of selected gradient information; and a step S3, on the basis of the modified point spread function, repairing the blurring iris image. According to the method, the adverse effect of the blurring iris image on the identification performance of a system can be effectively reduced, and the method can be widely applied to an iris identification system so as to improve the robustness and the reliability of the system and relax the requirement for a user.

Description

technical field [0001] The invention relates to the technical fields of digital image processing, pattern recognition, statistical learning and the like, in particular to a method for deblurring iris images. Background technique [0002] With the development and progress of society, people have higher and higher requirements for the reliability of identity authentication. Due to the various advantages of biometrics, researchers have recently proposed many authentication methods based on biometrics. Among them, iris recognition is especially suitable for people's identity authentication and identification because of its high uniqueness, strong stability, non-invasiveness and other advantages, and there have been many very successful applications, especially in large-scale and high-level applications. Where precision is required. [0003] The iris-based identity authentication system obtains the iris image from the iris imaging device and then analyzes it to complete the aut...

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Application Information

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IPC IPC(8): G06T5/00G06K9/00
Inventor 谭铁牛孙哲南刘京
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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