OpenCV Draw rectangle from center x,y

问题

I want to draw a rectangle using only a point to the center. So pretty much a rectangle around my center point. What is the easiest way of doing this?Thanks.

回答1:

Considering that center=(x,y), then:

cv::rectangle( image, 
               cvPoint(x-w/2,y-h/2),
               cvPoint(x+w/2,y+h/2),
               CV_RGB(r,g,b), 1, 8
             );

CvRect stores the top-left point as reference. So:

CvRect myrect=cvRect(x-w/2,y-h/2,w,h);

来源：https://stackoverflow.com/questions/17785602/opencv-draw-rectangle-from-center-x-y