face detection using opencv not working

Question

I am trying to create a sample face detection application using OpenCv library. I followed the following tutorials

http://docs.opencv.org/doc/tutorials/introduction/desktop_java/java_dev_intro.html https://www.openshift.com/blogs/day-12-opencv-face-detection-for-java-developers

But Iam getting the following warning and it is not detecting faces.

Hello, OpenCV

Running DetectFaceDemo
Detected 0 faces
Writing faceDetection.png
libpng warning: Image width is zero in IHDR
libpng warning: Image height is zero in IHDR
libpng error: Invalid IHDR data

Please help me.I am using linuxMint+eclipse system.

your image was not read properly (so it could not detect anything). — berak
– berak, Commented Apr 27, 2014 at 9:51

Tharindu Kumara · Accepted Answer · 2014-04-27 09:57:21Z

7

Problem is with the

FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath()

It returns something like this

/C:/src/open/haarcascade_frontalface_alt.xml

The slash at the begining should be removed

FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath().substring(1)

answered Apr 27, 2014 at 9:57

Tharindu Kumara

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3 Comments

Valath Over a year ago

you are correct. the issue was with resources loading from classpath. I addressed them in absolute path. It worked fine, thanks.

San Over a year ago

@Valath, I got the same error after the slash issue in the path fixed with substring(1).

Tharindu Kumara Over a year ago

What is the result of this? FaceDetector.class.getResource("haarcascade_frontalface_alt.xml").getPath()

Taha Emara · Accepted Answer · 2014-10-16 22:34:48Z

1

try this

CascadeClassifier faceDetector=newCascadeClassifier(JavaCam.class.getResource("haarcascade_frontalface_alt.xml").getPath().substring(1));

answered Oct 16, 2014 at 22:34

Taha Emara

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