Question

I am using this code to detect the basic shapes in the given Image. But it is telling that unable to open the Image . Please help me. Please let me know if my question is not clear

Answer 1

Your question needs a lot more detail than this to get an effective answer (e.g. are you doing this on a Macintosh or on an iPhone).

The bit of code in the sample you pointed to that’s failing is this:

img=cvLoadImage("shape.jpg");

if(img==NULL)
{
    printf("Error in opening image\n");
    return -1;
}

You need to put your file in a place where the app can find it.

If you were on a Macintosh, put the file in the same place where the actual binary executable lives (e.g. “MyApp.app/Contents/MacOS/MyApp“). Or change the path to be a precise place where you know for a fact the image is saved (e.g. “/tmp/shape.jpg” or “/Users/sri/shape.jpg“).

EDITED to add what to do for iOS. Try doing this:

NSString *str = [[NSBundle mainBundle] pathForResource:@"YQpBE" ofType:@"png"];
if(str)
{
    const char *pathToFile = [str UTF8String];
    img=cvLoadImage(pathToFile);
    if(img==NULL)
    {
        NSLog( @"could not open image file at path %@", str);
    }
} else {
    NSLog( @"could not find a file named YQpBE.png in the resource folder of this app");
}