CODEWITHSUNDEEP
c++eclipseubuntuopencv
wrahool
wrahool

Reputation: 1141

Passing IplImage pointers in opencv

I am looking to pass an IplImage* to a function and display the image in that function. My code is as follows.

#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <cv.h>
#include <highgui.h>


IplImage* doPyrDown(IplImage* in) {

    cvNamedWindow( "Debug", CV_WINDOW_AUTOSIZE );
    cvShowImage("Debug", in );
    cvWaitKey(0);
    cvReleaseImage(&in );

    IplImage* out = 0;
    return( out );
}

int main(int argc, char *argv[])
{

    cvNamedWindow( "Example6-in", CV_WINDOW_AUTOSIZE );

    IplImage* imgIN = 0;
    IplImage* imgOUT = 0;

    imgIN = cvLoadImage("image.jpg");
    cvShowImage("Example6-in", imgIN );
    cvWaitKey(0);
    cvReleaseImage(&imgIN );

    imgOUT = doPyrDown(imgIN);

    return 0;
}

The original image is displayed in the main function. But the image isn't getting displayed in the doPyrDown function. An empty window is getting created called "Debug".

Please help.

Upvotes: 0

Views: 2385

Answers (2)

Troubadour
Troubadour

Reputation: 13421

You do a cvReleaseImage on imgIN before passing it into doPyrDown. I'm not familiar with opencv but I would not expect cvShowImage to work after that.

Upvotes: 1

Alex F
Alex F

Reputation: 43311

Remove cvReleaseImage line from main function.

Upvotes: 0

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