OpenCv: Application hangs when rotating an image in a for loop

Question

The following code gives seg fault and some time stalls/hangs and never works.

for(i=0;i<360;i++)

{

CVrotate(image, i); //i is angle


display("image" in some window);  

}

but the following work very well.

 for(i=0;i<360;i++)

 {

 CVrotate(image, i); //i is angle

 waitkey(10);

 display("image" in some window);  
 }

Cvrotate is a function that is rotating an image, and the rotated image is being displayed by the opencv function for displaying.

Why is waitkey(); needed here? I understand that the display should be called only after CVrotate is done with its job. Similarly, I am assuming that the next iteration starts when the display is over and not before that. Please enlighten me.

Answer 1

What does OpenCV's cvWaitKey( ) function do? this link clears all the misconceptions regarding the cvWaitkey and its uses .Hope this is useful for you. cvWaitKey's main function is to pause the code for a while.