Error opencv & openframework While cropping image - image-processing

Question

I have the following code:
IplImage* f( IplImage* src )
{
// Must have dimensions of output image
IplImage* cropped = cvCreateImage( cvSize(1280,500), src->depth, src->nChannels );
// Say what the source region is
cvSetImageROI( src, cvRect( 0,0, 1280,500 ) );
// Do the copy
cvCopy( src, cropped );
cvResetImageROI( src );
return cropped;
}
void testApp::setup(){
img.loadImage("test.jpg");
finder.setup("haarcascade_frontalface_default.xml");
finder.findHaarObjects(img);
}
//--------------------------------------------------------------
void testApp::update(){
}
//--------------------------------------------------------------
ofRectangle cur;
void testApp::draw(){
img = f(img);
img.draw(0, 0);
ofNoFill();
for(int i = 0; i < finder.blobs.size(); i++) {
cur = finder.blobs[i].boundingRect;
ofRect(cur.x-20, cur.y-20, cur.width+50, cur.height+50);
}
}
It produces an error. I think it's because I don't convert IplImage to ofImage. Can someone please tell me how to do it?

Answer 1

I would imagine that your instance of img, that your passing to f(), is an instance of ofxCVImage or similar. As far as I know ofx store a protected variable of iplimage, as such you can't cast ofxCVImage to an iplimage.
You might try
img = f(img.getCvImage()) // ofxCvImage::getCvImage() returns IplImage