opencv4android 2.4.4
befort i use Imgproc.approxPolyDP, I want to convert Mat to MatOfPoint2f;
Mat initialImg = Highgui.imread("/sdcard/card.jpg", 0);
MatOfPoint2f matOfPoint2f=new MatOfPoint2f(initialImg);then I got the error:
03-20 10:35:57.825: E/AndroidRuntime(25073): java.lang.IllegalArgumentException: Incomatible Mat The error line is:
MatOfPoint2f matOfPoint2f=new MatOfPoint2f(initialImg);you can't approximate an Image with a polygon, you need to to find some contours first.
it's not a matter of converting Mat types, you're missing some processing steps.
to do it, you need to:
at first,thank you for you answer~ yes, you are right. in fact, I have done a similar deal with, such as canny, but after using canny, i have still Mat types, still need to convert Mat to MatOfPoint2f, what should i do?
Oh! I get it. I overlooked after findContours() i have List<MatOfPoint>. thank you very much~!
Asked: Mar 20 '13
Seen: 1,327 times
Last updated: Mar 20 '13
