OpenCV ~ cvSetImageROI ~ Region of Interest (ROI)

Usage of cvSetImageROI in openCV ‘s sample which is inpaint and output difference given in the end…

Example:

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#ifdef _CH_
#pragma package <opencv>
#endif

#include "cv.h"
#include "highgui.h"
#include <stdio.h>
#include <stdlib.h>

IplImage* inpaint_mask = 0;
IplImage* img0 = 0, *img = 0, *inpainted = 0;
CvPoint prev_pt = {-1,-1};

void on_mouse( int event, int x, int y, int flags, void* )
{
 if( !img )
 return;

 if( event == CV_EVENT_LBUTTONUP || !(flags & CV_EVENT_FLAG_LBUTTON) )
 prev_pt = cvPoint(-1,-1);
 else if( event == CV_EVENT_LBUTTONDOWN )
 prev_pt = cvPoint(x,y);
 else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON) )
 {
 CvPoint pt = cvPoint(x,y);
 if( prev_pt.x < 0 )
 prev_pt = pt;
 cvLine( inpaint_mask, prev_pt, pt, cvScalarAll(255), 5, 8, 0 );
 cvLine( img, prev_pt, pt, cvScalarAll(255), 5, 8, 0 );
 prev_pt = pt;
 cvShowImage( "image", img );
 }
}

int main( int argc, char** argv )
{
 char* filename = argc >= 2 ? argv[1] : (char*)"fruits.jpg";

 if( (img0 = cvLoadImage(filename,-1)) == 0 )
 return 0;

 printf( "Hot keys: \n"
 "\tESC - quit the program\n"
 "\tr - restore the original image\n"
 "\ti or ENTER - run inpainting algorithm\n"
 "\t\t(before running it, paint something on the image)\n" );

 cvNamedWindow( "image", 1 );

 img = cvCloneImage( img0 );
 inpainted = cvCloneImage( img0 );
 inpaint_mask = cvCreateImage( cvGetSize(img), 8, 1 );
//cvSetImageROI(img, cvRect(100, 150, 200, 150));
cvSetImageROI(img, cvRect(20, 50, 50, 70));
cvRectangle(img, cvPoint(10,15), cvPoint(20,50), cvScalar(255,0,0), 1);
 cvZero( inpaint_mask );
 cvZero( inpainted );
 cvShowImage( "image", img );
 cvShowImage( "watershed transform", inpainted );
 cvSetMouseCallback( "image", on_mouse, 0 );

 for(;;)
 {
 int c = cvWaitKey(0);

 if( (char)c == 27 )
 break;

 if( (char)c == 'r' )
 {
 cvZero( inpaint_mask );
 cvCopy( img0, img );
 cvShowImage( "image", img );
 }

 if( (char)c == 'i' || (char)c == '\n' )
 {
 cvNamedWindow( "inpainted image", 1 );
 cvInpaint( img, inpaint_mask, inpainted, 3, CV_INPAINT_TELEA );
 cvShowImage( "inpainted image", inpainted );
 }
 }

 return 1;
}
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inpaint example in opencv-1.0.0 file >>samples>>c

g++ -I/usr/include/opencv -o inpaint inpaint.cpp -lcxcore -lcv -lhighgui -lcvaux

Output without cvSetImageROI:

Output with cvSetImageROI:

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