Guided by: - Dr.Mohammed Shiri

By: -Ahmed AL Tememe

BIOMETRIC SECURITY

Modern and reliable method Hard to breach Wide range

Why Iris RecognitionHighly protected and stable, template size is small and image encoding and matching is relatively fast.

INTRODUCTION TO IRIS RECOGNITION

John Daugman, University of Cambridge – Pioneer in Iris Recognition.

Sharbat Gula – aged 12 at Afghani refugee camp.

18 years later at a remote location in Afghanistan.

OVERVIEW OF OUR SYSTEM

Figure Steps In Iris Segmentation & Hough Transform Process

Figure Iris Recognition Process

SEGMENTATION

Detecting the pupil edges Detecting the iris edges Extracting the iris region

Canny Edge Detection AlgorithmThe Canny edge detection algorithm consists of following steps: Smooth the image with a Gaussian filter Compute the gradient of image. Apply nonmaxima suppression to the gradient image Use double thresholding algorithm to detect and link edges.

The gradient amplitude image while inding outer and inner boundary of iris.

shows image after Non Maxima suppression

Hysteresis Thresholding

Lower eyelids segmented iris with the noise mask

Upper eyelids Segmented iris showing both circles.

NORMALISATION

Daugman’s Rubber Sheet Model:

(R, theta) to unwrap iris and easily generate a template code.

Fixed Dimension, Cartesian co-ordinates to Polar co-ordinates.

Variations in eye: Optical size (iris), position (pupil), Orientation (iris).

FEATURE EXTRACTION AND MATCHING

Generate a template code along with a mask code.

Compare 2 iris templates using Hamming distances.

Shifting of Hamming distances: To counter rotational inconsistencies.

<0.32: Iris Match >0.32: Not a Match

RESULTS AND CASE STUDIES

FAR, FRR EER: 18.3 % which gives an accuracy close to 82%

ROC: Receiver Operator Characteristics

Advantages Uniqueness of iris patterns hence improved

accuracy. Highly protected, internal organ of the eye Stability : Persistence of iris patterns. Non-invasive : Relatively easy to be

acquired. Speed : Smaller template size so large

databases can be easily stored and checked.

Cannot be easily forged or modified.

Concerns / Possible improvements

High cost of implementation Person has to be “physically” present. Capture images independent of surroundings

and environment / Techniques for dark eyes. Non-ideal iris images

Inconsistent Iris size Pupil Dilation Eye Rotation

REFERENCES1] Wildes, R.P, “Iris Recognition: An Emerging Biometric Technology”, Proceedings of the IEEE, VOL. 85, NO. 9, September 1997, pp. 1348-1363. 2] John G. Daugman. How Iris Recognition Works. Proceedings of 2002 International Conference on Image Processing, Vol. 1, 2002. 5) J. Daugman “High confidence visual recognition of persons by a test of statistical independence ,”IEEE Trans. Pattern Analyse Machine Intell., vol. 15, pp. 1148–1161, Nov. 1993. 6) R. Wildes, “Iris recognition: an emerging biometric

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