Method for pre-processing iris image

An iris image and preprocessing technology, applied in the direction of instruments, character and pattern recognition, computer components, etc., can solve problems such as wrong positioning, large amount of calculation, and weak algorithm robustness
CN102332098BInactive Publication Date: 2014-03-12HUNAN CHUANGYUAN INTELLIGENT TECH
3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HUNAN CHUANGYUAN INTELLIGENT TECH
Publication Date
2014-03-12
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a method for pre-processing an iris image. The method comprises the following steps of: (1) extracting an infrared lamp image in the iris image; (2) calculating the size and the centre position of a reflection imaging light aperture; (3) carrying out low gray level filling on an illumination light reflection image region; (4) selecting an image in a certain range at four sides as a local image including pupils by taking the centre of the aperture as the centre; (5) precisely locating an inner boundary; (6) precisely locating the boundary of an iris; and (7) nonlinearly normalizing an iris region: firstly, calculating the expansion rate of the iris, determining a quantized interval by using the expansion rate, and then normalizing irregular annular regions into regular rectangular regions. The method for pre-processing the iris image disclosed by the invention cannot be influenced by light sources, light spots and shading of eyelids and eyelashes so as to avoid wrong orientation. The method has strong algorithm robustness and high calculation speed. The method can be used for processing the normalization process of the iris image in real time.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to an iris image preprocessing method. Background technique

[0002] With the development of information technology in today's society, the issue of identity authentication is becoming more and more important, and the research on intelligent identity authentication based on biometric identification is attracting widespread attention. Biometric identification is based on a certain behavior or anatomical characteristics of a person to authenticate an individual's identity, such as voice, face, fingerprint, retina, signature, gait and iris information. Compared with other identification algorithms, iris features have the advantages of uniqueness, stability, collectability, and non-invasiveness. The research on using iris features for identification and authentication has been highly valued by academia and industry.

[0003] In the identification system based on iris features, the preprocessing of iris images is the most basic and cr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More