如何在Java OpenCV中实现两个点相加？（C++代码转Java）

Got it! The problem here is that C++ OpenCV's Point class has an overloaded + operator that lets you easily add two points together, but Java doesn't support operator overloading. So we have to manually calculate the combined x and y coordinates instead.

Step-by-Step Explanation: #

• In your C++ code, faces[0].tl() + eye.tl() takes the top-left corner of the first face rectangle and adds the top-left corner of the eye rectangle to it. This gives the absolute position of the eye within the frame.
• In Java, we need to create a new Point by adding the x and y values of the two points separately.

Updated Java Code: #

Rect[] faces = myFaces.toArray(new Rect[myFaces.size()]); // Avoids unchecked cast warning
Rect[] eyes = myEyes.toArray(new Rect[myEyes.size()]);

for (Rect eye : eyes) {
    // Calculate the absolute top-left point of the eye
    Point topLeft = new Point(
        faces[0].tl().x + eye.tl().x,
        faces[0].tl().y + eye.tl().y
    );
    // Calculate the absolute bottom-right point of the eye
    Point bottomRight = new Point(
        faces[0].tl().x + eye.br().x,
        faces[0].tl().y + eye.br().y
    );
    // Draw the rectangle
    Imgproc.rectangle(frame, topLeft, bottomRight, new Scalar(255, 0, 0), 2);
}

Quick Note: #

I added new Rect[myFaces.size()] to the toArray() calls to get rid of the unchecked cast warning you might have seen. It's a small improvement that makes the code cleaner and safer.

内容的提问来源于stack exchange，提问作者Blazing Forrest