How does the vision.CascadeObjectDetector detect left and right eyes separately? It is constantly detecting left and right as the same eye.
5 views (last 30 days)
Show older comments
I am using the vision.CascadeObjectDetector to find eyes in facial images.
I am reading in the image, converting to gray scale and performing the detection similar to the face detection tutorial here: http://www.mathworks.com.au/help/vision/ref/vision.cascadeobjectdetector-class.html
and using 'LeftEyeCART' and 'RightEyeCART' as classification models.
The for some images in my database the detector is finding the left and right eyes to be the same eyes, with no notable variation in image causing the false detection. See the images below:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/145428/image.jpeg)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/145429/image.jpeg)
How does it work? Does it scan the image from the right hand side to find eyes and simply missed the left eye? Therefore will I have to do some pre - processing on the images to aid the detection? Will I have to train a Cascade Object Detector like this example: http://www.mathworks.com.au/help/vision/ug/train-a-cascade-object-detector.html
for my dataset?
0 Comments
Answers (3)
Dima Lisin
on 17 Sep 2014
If both eyes are visible, you would be better off trying to detect the pair of eyes using 'EyePairBig' and 'EyePairSmall' models. Single eye detectors are more useful in cases when only one eye is visible.
2 Comments
Ushna Asif
on 21 Nov 2015
I want to detect left and right separately and I also having the same problem kindly help.
Dima Lisin
on 26 Jan 2016
Why not detect both eyes, and then split the resulting bounding box in half?
ibrahim thamary
on 26 Dec 2017
try this:
I= imread('img.jpg');
EyeDetect = vision.CascadeObjectDetector('EyePairBig');
BB=step(EyeDetect,I);
x=length(BB(:,4));
%To detect Eyes
I2 = imcrop(I,BB(x,:));
figure,imshow(I2);
rectangle('Position',BB,'LineWidth',4,'LineStyle','-','EdgeColor','b');
%To detect the left
na1 = I2(:, 1 : floor(end/2.3));
figure,imshow(na1);
%To detect the right
na2 = I2(:, floor(end/(2.24))+1 : end );
figure,imshow(na2);
1 Comment
Luis Orlando Mendoza Guerrero
on 10 Nov 2020
hi,
when i copy, line 8 has error... 'Value must be a 4 element vector'
See Also
Categories
Find more on Image Processing and Computer Vision in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!