C ++到Java-OpenCV

Question

I am trying to "port" an OpenCV C++ program to Java, but the syntax is quite different.

I can't find the Java OpenCV equivalents of:

img_bw.at<uchar>(j,i);
boundingRect();
vector.push_back(Point(i,j)); // the Point part

Also, how to reserve space in a Vector?

Answer 1

It is hard to find the Java equivalents for openCV C++ code. You just have to dig through the internet. A lot of it is already on StackOverflow.

A vector is essentially a Matrix. So Mat is god place to look. MatOfPoint should be your vector equivalent, which is just a matrix with points. There are many more MatOf-type objects.

This code is not semantically equivalent (as I don't know C++), but to give you an idea where to go from here:

mat.get(row, col); // returns pixel info as a double[]
Imgproc.boundingRect(matOfpoint); // returns a Rectangle that wraps the points in this matrix
matOfpoint.push_back(otherMatOfPoint); // pushes points from otherMatOfPoint to the matOfPoint matrix