how to implement iris recognition system ? please help

just tell me how to implement the source code of it. also explain the basic approach. i mean how should i start. what related functions should i look for.. and what is the basic algorithm behind the code. please help i really need it.

Answer 1

[Hari]

Hi samarpit,

I understand that you want to implement an iris recognition system in MATLAB

I assume you have access to a dataset of eye images for testing and are familiar with basic image processing concepts.

In order to implement an iris recognition system, you can follow the below steps:

Preprocess the Image:

Load the eye image and preprocess it to enhance features. This includes converting to grayscale and applying histogram equalization to improve contrast.

I = imread('eye_image.jpg');
if size(I, 3) == 3
    I = rgb2gray(I);
end
I = histeq(I); % Histogram equalization

Segment the Iris:

Use edge detection and the Hough Transform to detect the circular boundary of the iris and pupil. This helps isolate the iris region.

edges = edge(I, 'canny');
[centers, radii] = imfindcircles(edges, [20 50], 'ObjectPolarity', 'dark');

Normalize the Iris:

Transform the segmented iris region to a fixed dimension using polar coordinates. This normalization helps in comparing different irises.

% Example function call (pseudo-code)
normalizedIris = normalizeIris(I, centers, radii);

Extract Features:

Apply Gabor filters to extract unique features from the normalized iris image. These features form the basis for recognition.

gaborArray = gabor([4 8], [0 90]);
gaborMag = imgaborfilt(normalizedIris, gaborArray);

Match and Recognize:

Compare the extracted features with a database of known iris features using a suitable distance metric to recognize the iris.

% Example matching function (pseudo-code)
matchScore = compareFeatures(gaborMag, irisDatabase);

Refer to the documentation of "imfindcircles" function to know more about the properties supported: https://www.mathworks.com/help/images/ref/imfindcircles.html

Hope this helps!