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houghCircles to detect pupil

asked 2016-01-19 11:05:25 -0500

SiPL gravatar image

updated 2016-01-20 23:10:34 -0500

Hello :D I'm trying to detect circles in detected eyes but houghCircles fail to detect any circles. This is my code

What could be the problem? Please help me.

Edit: I think i found why it can't detect any circles.

After detecting i tried showing the image.

Detected eyes here: eye_cascade.detectMultiScale(faceROI, eyes, 1.1, 1, 0, Size(30, 30));

Stored the first detected eye image in eyeROI: Mat eyeROI = gray_img(eyes[0]);

Display eyeROI: imshow("eye", eyeROI);

What i saw was that it is showing parts of objects beside my detected eye. Sometimes a part of my room door which is next o my face and sometimes a part of my hair. Its not showing the detected eye and maybe thats why houghcircles failed to detect any circular objects. What could be the problem?

Edit 2: The second problem is fixed. Now just cant get it to detect houghcircles in eye image window.

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@hi, SiPL, if you could add an example image ?

berak gravatar imageberak ( 2016-01-19 11:08:06 -0500 )edit

Hi berak, i'm so sorry for replying late. I'm taking a live video from a webcam as input. When i try to detect in the entire video frame it detects other circles such as a DVD but fails to detect pupil. Is that because i haven't given any image transformations?

SiPL gravatar imageSiPL ( 2016-01-19 12:14:29 -0500 )edit
sturkmen gravatar imagesturkmen ( 2016-01-20 15:22:04 -0500 )edit

Ty :D I'll look at it and try if it works

SiPL gravatar imageSiPL ( 2016-01-20 23:11:21 -0500 )edit

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answered 2016-01-20 04:44:23 -0500

Like said on freenode, take a look at the iris localisation algorithm I have written for the OpenCV 3 Blueprints book and which can be found here.

It is also based on Hough circle localisation to find the outer and inner contour of the iris.

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Asked: 2016-01-19 11:05:25 -0500

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Last updated: Jan 20 '16