A Method of Iris Location Based on Radial Gradient Detection

A radial gradient and iris positioning technology, which is applied in image data processing, instruments, character and pattern recognition, etc., can solve the problems of inability to accurately locate the iris, slow iris positioning speed, etc.

Active Publication Date: 2017-12-12
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

[0009] The purpose of the present invention is to provide an iris positioning method based on radial gradient detection, which solves the problems of slow iris positioning speed and inability to accurately locate iris due to local interference

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  • A Method of Iris Location Based on Radial Gradient Detection
  • A Method of Iris Location Based on Radial Gradient Detection
  • A Method of Iris Location Based on Radial Gradient Detection

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[0076] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0077] A kind of concrete steps of the iris localization method based on radial gradient detection are:

[0078] The first step is to obtain the iris image, estimate the position of the pupil center and use it as a reference point to divide the iris area to be searched.

[0079] First, search for locations where light source image points may exist. There are different degrees of interference in the iris image collected in practice. In order to eliminate the influence of high-frequency interference on the iris boundary pos...

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Abstract

The invention discloses an iris positioning method based on radial gradient detection. The steps of the method include estimating the position of the center of the pupil, using it as a reference point to divide the iris area to be searched, and expanding the iris area to be searched into a certain size according to polar coordinates. Rectangular area; use the radial gradient detection method to locate the inner boundary of the iris region; use the radial gradient detection method to locate the outer boundary of the iris region and fine-tune the reference radius of the outer boundary according to the radial gradient in the neighborhood. The technical solution of the present invention avoids the point-by-point three-dimensional space search of the iris boundary parameters in a large range, and the adaptive determination of the complex threshold for edge detection and area segmentation, and is affected by the interference of light source image points and uneven illumination Smaller, it can achieve fast and precise iris positioning, which helps to improve the recognition speed and accuracy of the iris recognition system.

Description

technical field [0001] The invention relates to an image segmentation method. More specifically, it relates to a fast iris location method for an iris biometric system. Background technique [0002] Iris recognition has gradually become a research hotspot and development trend in the field of biometrics due to its significant advantages such as accuracy, stability, safety and non-contact. In the iris recognition system, iris image preprocessing (including iris location, interference detection, normalization and image enhancement, etc.) is the premise of iris recognition, and iris location is the key. Only when the positioning is accurate can more effective iris features be extracted to achieve accurate identification. However, in practical applications, due to factors such as hardware limitations of the acquisition equipment and illumination changes in the acquisition environment, there are often varying degrees of noise interference, blurred details, and low contrast in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G06K9/32G06T7/136
CPCG06T7/11G06T2207/30196G06V40/193G06V10/245
Inventor 郭慧杰王超楠杨倩倩韩一梁杨昆年丰
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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