There is 'line' function, but the parameter of lineType has only 3 value, that is 8, 4 and CV_AA. All these plot solid lines. So how can I plot dotted line using OpenCV directly?
Thank you!
line
Draws a line segment connecting two points. C++: void line(Mat& img, Point pt1, Point pt2, const Scalar& color, int thickness=1, int lineType=8, int shift=0)
unfortunately, you can't do it directly, opencv only has solid lines for drawing
if you really need a dotted or stippled line, try something like this:
cv::Mat img = cv::imread("herring.jpeg",1); // bgr image
Point p1(20,20); // start & end points
Point p2(80,50);
LineIterator it(img, p1, p2, 8); // get a line iterator
for(int i = 0; i < it.count; i++,it++)
if ( i%5!=0 ) {(*it)[0] = 200;} // every 5'th pixel gets dropped, blue stipple line
Asked: 2013-04-06 10:07:24 -0600
Seen: 29,488 times
Last updated: Apr 06 '13