Comments on: Face Detection in Static Images with Python

By: Robert McGuire

Robert McGuire — Thu, 21 Jan 2010 17:21:37 +0000

Marius – have you tried ryanhaigh’s suggestion of changing the “if faces:” line to “if faces.total > 0:”?

By: marius

marius — Thu, 21 Jan 2010 14:01:46 +0000

Hi, I get an error when running this script:

$ ./face_detect.py lena.jpg
terminate called after throwing an instance of ‘int’
Aborted
$ _

The same happens when running this from the python shell. When copy-pasting single lines, the error appears at “faces = cvHaarDetectObjects(…)”. The shell is also killed. I don’t even have a guess on where to start looking here. Any ideas on what goes wrong?

By: ryanhaigh

ryanhaigh — Sat, 22 Aug 2009 09:30:49 +0000

Thanks for this information it was very useful to me. I did however have a problem when using this in a larger program and I thought others might find it useful. It seems that “if faces:” will still be true even if no faces are found in the image. Using “if faces.total > 0:” worked perfectly.

Thanks Again,
ryanhaigh

By: Anony M.

Anony M. — Mon, 18 May 2009 23:09:48 +0000

Thank you very much indeed, sir.

By: Dom

Dom — Tue, 05 May 2009 11:24:17 +0000

p.s. tested and working with the ISO standard CV http://en.wikipedia.org/wiki/Lenna test image

By: Dom

Dom — Tue, 05 May 2009 11:21:32 +0000

Thanks for this example!

FYI, /usr/share/opencv/haarcascades/haarcascade_frontalface_default.xml is contained in libcv-dev so you actually need to install that too for the code to run

i.e.,

$ sudo apt-get install python-opencv libcv-dev

By: Henrik

Henrik — Mon, 23 Mar 2009 17:46:35 +0000

Thx, was looking for this!