Java 中的 OpenCV Mat 如何表示二元向量？

Question

我在看 Opencv Java documentation of Hough Transform。

return 值 lines 属于 Mat 数据类型，描述为：

Output vector of lines. Each line is represented by a two-element vector (rho, theta). rho is the distance from the coordinate origin (0,0) (top-left corner of the image). theta is the line rotation angle in radians (0 ~ vertical line, pi/2 ~ horizontal line).

奇怪的是，这个描述与 the C++ interface's description, but the data type not: in C++ you can use a std::vector<cv::Vec2f> lines as described in this tutorial 相符。在 C++ 中，根据描述，returned 数据表示很简单，但在 Java 中则不然。

那么，在Java中，returned Mat中的二元向量represented/stored如何？

Answer 1

这是我不久前使用的一些代码，我认为是在 2.4.8 版本中。 matLines 来自于此：

Imgproc.HoughLinesP(matOutline, matLines, 1, Math.PI / 180, houghThreshCurrent, houghMinLength, houghMaxGap);

...

Point[] points = new Point[]{ new Point(), new Point() };
for (int x = 0; x < matLines.cols(); x++) {
   double[] vec = matLines.get(0, x);
   points[0].x = vec[0];
   points[0].y = vec[1];
   points[1].x = vec[2];
   points[1].y = vec[3];
   //...
}

Java 中的 OpenCV Mat 如何表示二元向量？

How are two-element vector represented in a OpenCV Mat in Java?

java

opencv

image-processing