OpenCV imshow not displaying image in osx

Question

I\'m working right out of a book, and copied the following code (essentially the openCV equivalent of \"hello world\"):

//helloCV.cpp
#include 

        

Answer 1

Thanks to @DanMašek for the lead on this one, and to all the people on this page: http://answers.opencv.org/question/160201/video-window-not-loading-frame/

To repeat what they said, what worked for me was the following:

To resolve this, locate the file window_cocoa.mm; if built from source it'll be in opencv/modules/highgui/src.

Change the following:

@implementation CVView
#if defined(__LP64__)
@synthesize image;
#else // 32-bit Obj-C does not have automatic synthesize
@synthesize image = _image;
#endif

To this:

@implementation CVView
@synthesize image = _image;

Do the same thing for the CVWindow and CVSlider implementations to accommodate videos as well.

Recompile OpenCV and test out your code.

Hope this helps other people struggling with this issue!