How to convert MatOfPoint to MatOfPoint2f in opencv java api

Question

I\'m trying to implement the example code of the following question by using opencv java api. To implement findContours(gray, contours, CV_RETR_LIST, CV_CHAIN_APPROX_

Answer 1

MatOfPoint2f differs from MatOfPoint only in the type of the elements (32-bit float and 32-bit int respectively). The viable option (though with a performance penalty) is to create MatOfPoint2f instance and set its elements (in a loop) to be equal to the elements of of the source MatOfPoint.

There are

 public void fromArray(Point... lp);
 public Point[] toArray();

methods in both of the classes.

So you can do just

 /// Source variable
 MatOfPoint SrcMtx;

 /// New variable
 MatOfPoint2f  NewMtx = new MatOfPoint2f( SrcMtx.toArray() );