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eye blinks detection from video frames

asked 2015-09-28 06:18:27 -0600

sarmad gravatar image


I want to detect blinks from video frames that recorded using eye glasses like the image in the attachment .

What is the best way to do this ?



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I'd try a circle fitting on the pupil, which seems to be clear enough..

David_86 gravatar imageDavid_86 ( 2015-09-28 07:17:36 -0600 )edit

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answered 2015-09-28 07:52:56 -0600

David_86 gravatar image

updated 2015-09-28 09:48:00 -0600

Just a quick try.. RESULT

When in a frame the circle cannot be detected then the eye is blinking.

What I've done in this test:

  1. Use GaussianBlur to smooth the image
  2. Threshold the image to keep only the darkest part, with THRESH_BINARY you can define a range of grey value to use as filter level
  3. Use HoughCircles to fit circle in the image. Since the pupil is the only circle-like part in your image you can define a min/max radius value and get a unique circle
  4. Draw the result
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How this circle detects the eye ?

I'm a beginner in opencv , can you explain more ,


sarmad gravatar imagesarmad ( 2015-09-28 09:05:26 -0600 )edit

Edited the the documentation you will find easy examples on how to use those functions, added links too ;-)

David_86 gravatar imageDavid_86 ( 2015-09-28 09:39:40 -0600 )edit

I have come up with this code , but I think it is not accurate , It can't track the eye when it moves in video

    Mat frame,grey,edge,draw,src_gray,dst;
    cap >> frame; 
    cvtColor( frame, grey, CV_BGR2GRAY );
    GaussianBlur( grey, src_gray, Size(9, 9), 2, 2 );
    threshold(src_gray,dst, 0, 255, THRESH_BINARY);
    SimpleBlobDetector detector;
    std::vector<KeyPoint> keypoints;
   detector.detect(  dst, keypoints);
   Mat im_with_keypoints;
   drawKeypoints( grey, keypoints, im_with_keypoints, Scalar(0,0,255), DrawMatchesFlags::DRAW_RICH_KEYPOINTS )

Image 2Image 1

sarmad gravatar imagesarmad ( 2015-09-28 10:33:58 -0600 )edit

Can you post the video or the frame where you can't track it? I think you're blurring the image too much, Size(3,3) will be fine..If you are missing some part of the pupil (because of the led lights reflected i suppose) you can try to erode and then dilate the image after thresholding, or adjust the radius range..that should fix the problem since the pupil is always clearly visible with a close-up image like that

David_86 gravatar imageDavid_86 ( 2015-09-28 16:41:00 -0600 )edit

This is the video that I'm trying


sarmad gravatar imagesarmad ( 2015-09-29 04:44:32 -0600 )edit

answered 2015-09-29 04:15:05 -0600

I'll try a simple approach, based on this paper [1]:

  1. The LBP histogram describing the open eyes is constructed
  2. Eye blinks are detected as sharp peaks of the dissimilarity between the template and the histogram of the current frame

[1] Malik, K., & Smolka, B. (2014, April). Eye blink detection using Local Binary Patterns. In Multimedia Computing and Systems (ICMCS), 2014 International Conference on (pp. 385-390). IEEE.

In order to build the LBP histogram of the eyes, you can use these other posts:

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is the method of LBP has good results ?

sarmad gravatar imagesarmad ( 2016-01-30 09:39:03 -0600 )edit

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Asked: 2015-09-28 06:18:27 -0600

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Last updated: Sep 29 '15