CODEWITHSUNDEEP
javaandroidopencv
Gabriel Muñumel
Gabriel Muñumel

Reputation: 1876

Convert MatOfPoint2f to MatOfPoint

I'm working in an opencv project for android. I need to convert a variable from MatOfPoint2f to MatOfPoint. As follows is the relevant part of my code: approx is of type MatOfPoint2f and I need to convert it because drawContours use type ArrayList<MatOfPoint>.

Imgproc.approxPolyDP(newMtx, approx, 0.02*peri, true);
approxMatOfPoint = (MatOfPoint) approx; // to convert
ArrayList<MatOfPoint> p = new ArrayList<>();
p.add(approxMatOfPoint);
Imgproc.drawContours(img, p, 0, new Scalar(0,255,0), 2);

Upvotes: 3

Views: 3783

Answers (1)

Gabriel Mu&#241;umel
Gabriel Mu&#241;umel

Reputation: 1876

I solved doing the following: 

MatOfPoint approxf1 = new MatOfPoint();
...

Imgproc.approxPolyDP(newMtx, approx, 0.02*peri, true);
approx.convertTo(approxf1, CvType.CV_32S);
List<MatOfPoint> contourTemp = new ArrayList<>();
contourTemp.add(approxf1);
Imgproc.drawContours(img, contourTemp, 0, new Scalar(0, 255, 0), 2);

Cheers.

Upvotes: 7

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