Face and Eye Detection us Emgucv

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Hi I am doing some basic face and eyes detection using haar clasifiers how ever i am stuck as the final image does not have rectangles drawn on it. When i debug my code it does not go into foreach statement.I am not really sure where i am missing the trick.

C#

grayImage = orignalImage.Convert<Gray, byte>();
           hFAces = new HaarCascade("haarcascade_frontalface_default.xml");
           hEyes = new HaarCascade("haarcascade_eye.xml");
           MCvAvgComp[][] Storefaces = grayImage.DetectHaarCascade(hFAces, 1.2, 2, HAAR_DETECTION_TYPE.DO_CANNY_PRUNING, new Size(orignalImage.Width,orignalImage.Height));
           MCvAvgComp[][] StoreEyes = grayImage.DetectHaarCascade(hEyes, 1.2, 2, HAAR_DETECTION_TYPE.DO_CANNY_PRUNING, new Size(orignalImage.Width, orignalImage.Height));

           foreach(MCvAvgComp hFAce in Storefaces[0])
           {
               orignalImage.Draw(hFAce.rect, new Bgr(Color.Red), 2);
           }
           foreach (MCvAvgComp hEye in  StoreEyes[0])
           {
               orignalImage.Draw(hEye.rect, new Bgr(Color.Blue), 2);
           }

           pictureBox2.Image = orignalImage.ToBitmap();

Posted 29-Jan-14 3:30am

loraloper_22

Updated 29-Jan-14 3:40am

v2

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Pete O'Hanlon · Accepted Answer · 2014-01-29T03:51:00

Solution 1

If you put a breakpoint on the initial foreach, are there any values in Storefaces or StoreEyes at all? Note that when I use DetectHaarCascade, I normally just pass in the HaarCascade - I don't use the other parameters. Have you tried just using:

C#

var StoreFaces = grayImage.DetectHaarCascade(hFAces);
var StoreEyes = grayImage.DetectHaarCascade(hEyes);

Posted 29-Jan-14 3:51am

Pete O'Hanlon

Comments

loraloper_22 29-Jan-14 10:01am

HiWell it is amazing that it works when you just pass Cascades, but being student of the game i would like to know why is this because i have been following a tutorial
http://www.youtube.com/watch?v=E7LrsoyqATE
Looks like it worked well even if you pass more than one argument.?.
P.S It works fine when you only pass haarcascade but there has been precedence of people solving it
http://stackoverflow.com/questions/14294627/eye-and-mouth-detection-from-face-using-haar-cascades
http://stackoverflow.com/questions/3948926/opencv-emgu-c-sharp-face-extraction?rq=1
Thanks anyways

Pete O'Hanlon 29-Jan-14 10:12am

My guess is that the Size is your problem. This parameter is the minimum scale of the face to search for - most people who use the none default size tend to use a fractional value of their overall image size, so you could set it to something like: new Size(orignalImage.Width / 2, orignalImage.Height / 2)

loraloper_22 29-Jan-14 10:22am

HiAbsolutely right it was all about size

Pete O'Hanlon 29-Jan-14 10:23am

I'm glad that's sorted. Good job and thanks for letting me know.

loraloper_22 29-Jan-14 10:25am

Thanks a lot for your help

Pete O'Hanlon 29-Jan-14 10:29am

You're welcome. It was a great question - you clearly showed the code that was causing a problem and explained what issue you were seeing. Honestly, it was a pleasure helping. Keep posting questions of this standard and I will be your friend for life.