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Rapid iris positioning method with illumination robustness

A positioning method and iris technology, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., can solve the problems of large iris positioning deviation and achieve high practical value and wide application prospects

Inactive Publication Date: 2014-10-08
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a

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  • Rapid iris positioning method with illumination robustness
  • Rapid iris positioning method with illumination robustness
  • Rapid iris positioning method with illumination robustness

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0041] The light-robust fast iris positioning method of the embodiment of the present invention, such as figure 1 shown, including the following steps:

[0042] S1. Input a natural light photo of a frontal face, and use the local active appearance model to detect the position of the eye area on the input face image;

[0043] S2. Execute the edge operator on the eye area, obtain the edge image of the eye area, calculate the fitting curve of the eye edge, and find the inner and outer corners of the eyes; and use the connection line of the corners of the eyes as a reference line to deflect the face ...

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Abstract

The invention discloses a rapid iris positioning method with illumination robustness. The method comprises the steps of inputting a natural illumination photo of the front side of the human face, detecting the positions of the eye areas on the input human face image through a partial active appearance model, executing edge operators on the eye areas to acquire edge images of the eye areas, calculating fitted curves of the eye edges to work out internal canthus points and external angular canthus points, correcting the deflection angle of the human face with the connecting lines of the canthus points as reference lines, connecting the internal canthus points and the corresponding external canthus points, searching for the edges of the iris areas with the central points of the connecting lines as the initial search positions, regarding the detected length of the connecting line of the left edge point and the right edge point of each iris as the diameter of the corresponding iris and the central point of each connecting line as the positioned central point of the corresponding iris, and outputting the coordinates of the central points and the diameters of the irises. Positioning of the central points of the human eyes is achieved under natural lighting, and therefore the method has certain robustness for illumination and eyelid sheltering.

Description

technical field [0001] The invention relates to the fields of image processing and pattern recognition, in particular to a method for detecting and locating eye iris center points in frontal face images under natural light conditions. Background technique [0002] Under natural lighting, eye center localization and gaze direction detection for general-resolution face images has gradually become a research hotspot in computer vision and human-computer interaction in recent years. The iris detection method of the eye movement recognition instrument based on infrared light source and high-resolution camera uses the bright pupil characteristics of the iris area to infrared light to realize the detection of iris. There are special requirements. [0003] Under natural lighting conditions, the rough position of the eyes can be determined by using the projection function of the image based on the characteristics of the gray scale of the local area of ​​the eye. Feng G.C, Yuen P.C u...

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Application Information

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IPC IPC(8): G06K9/00
Inventor 徐国庆
Owner WUHAN INSTITUTE OF TECHNOLOGY
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