J Korean Soc Med Inform.  2009 Jun;15(2):227-234. 10.4258/jksmi.2009.15.2.227.

A Study on Pupil and Iris Segmentation of the Anterior Segment of the Eye

• Kang HC
• Kim KG
• Oh WV
• Hwang JM

• KMID: 2211392
• DOI: http://doi.org/10.4258/jksmi.2009.15.2.227

Abstract

OBJECTIVE
The goal of this study was to develop a novel pupil and iris segmentation algorithm. We evaluated segmentation performance based on a fractal model. Two methods were compared: Daugman's and our new proposed method. METHODS: We received 200 anterior segment images with 3,872x2,592 pixels. Here we present an active contour model that accurately detects pupil boundaries in order to improve the performance of segmentation systems. We propose a method that uses iris segmentation based on a fractal model. We compared the performance of Daugman's method and the proposed new method and statistically analyzed the results. RESULTS: We manually compared segmentation with the Daugman's method and the new proposed method. The findings showed that the proposed segmentation accuracy was about 2.5 percent higher than Daugman's method. There was a significant difference (p<0.05) between the under and over data between the two methods. CONCLUSION: The results of this study show that the new proposed method was more accurate than the conventional method for the measurement of segmentation of the eye by CAD (Computer-aided Diagnosis).

Keyword

Pupil; Iris; Segmentation; Computer-aided Diagnosis; Image Processing

MeSH Terms

Eye
Fractals
Iris
Pupil

Figure

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  Figure 1 Flowchart of proposed method

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  Figure 2 (a) Original image, (b) Image of hue, (c) Image of saturation, (d) Image of value

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  Figure 3 Pupil segmentation result

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  Figure 4 Iris segmentation based on radiuses directions

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  Figure 5 The result of iris segmentation of fractal dimension method

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  Figure 6 The ratio of over segmentation

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  Figure 7 The comparison between Daugman's method and proposed method

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  Figure 8 The ratio of under segmentation

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  Figure 9 The comparison between Daugman's method and proposed method

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