Working on Face Detection and Recognition, and after successfully detecting a face, I just want to crop the face and save it somewhere in the drive to give it for the recognition code. I am having hard time doing the saving the Region of Interest as a new image. I have got some codes online but it is written in the previous version of OpenCV that uses IplImage*
. I am using OpenCV 2.4.2 that uses cv::Mat
.
Heeeelp!!!
I will post my codes(Face detection and Recognition per se) if you guys want it.
#include <cv.h>
#include <highgui.h>
#include <math.h>
// alphablend <imageA> <image B> <x> <y> <width> <height>
// <alpha> <beta>
IplImage* crop( IplImage* src, CvRect roi)
{
// Must have dimensions of output image
IplImage* cropped = cvCreateImage( cvSize(roi.width,roi.height), src->depth, src->nChannels );
// Say what the source region is
cvSetImageROI( src, roi );
// Do the copy
cvCopy( src, cropped );
cvResetImageROI( src );
cvNamedWindow( "check", 1 );
cvShowImage( "check", cropped );
cvSaveImage ("style.jpg" , cropped);
return cropped;
}
int main(int argc, char** argv)
{
IplImage *src1, *src2;
CvRect myRect;
// IplImage* cropped ;
src1=cvLoadImage(argv[1],1);
src2=cvLoadImage(argv[2],1);
{
int x = atoi(argv[3]);
int y = atoi(argv[4]);
int width = atoi(argv[5]);
int height = atoi(argv[6]);
double alpha = (double)atof(argv[7]);
double beta = (double)atof(argv[8]);
cvSetImageROI(src1, cvRect(x,y,width,height));
cvSetImageROI(src2, cvRect(100,200,width,height));
myRect = cvRect(x,y,width,height) ;
cvAddWeighted(src1, alpha, src2, beta,0.0,src1);
cvResetImageROI(src1);
crop (src1 , myRect);
cvNamedWindow( "Alpha_blend", 1 );
cvShowImage( "Alpha_blend", src1 );
cvWaitKey(0);
}
return 0;
}
Thanks. Peace
Using cv::Mat
objects will make your code substantially simpler. Assuming the detected face lies in a rectangle called faceRect
of type cv::Rect
, all you have to type to get a cropped version is:
cv::Mat originalImage;
cv::Rect faceRect;
cv::Mat croppedFaceImage;
croppedFaceImage = originalImage(faceRect).clone();
Or alternatively:
originalImage(faceRect).copyTo(croppedImage);
This creates a temporary cv::Mat
object (without copying the data) from the rectangle that you provide. Then, the real data is copied to your new object via the clone or copy method.