Question

我正在开发Android应用程序，我想使用Harris角点检测。我想绘制检测到的角落，但我似乎无法找到Java代码的文档。

到目前为止我的代码：

Mat inputImage = inputFrame.rgba();
Imgproc.cornerHarris(inputImage, inputImage, 7, 5, 0.05, Imgproc.BORDER_DEFAULT);

如何检测并显示角落？

Answer 1

对于Java，您可以尝试这段代码。

private void Harris(Mat Scene, Mat Object, int thresh) {

    // This function implements the Harris Corner detection. The corners at intensity > thresh
    // are drawn.
    Mat Harris_scene = new Mat();
    Mat Harris_object = new Mat();

    Mat harris_scene_norm = new Mat(), harris_object_norm = new Mat(), harris_scene_scaled = new Mat(), harris_object_scaled = new Mat();
    int blockSize = 9;
    int apertureSize = 5;
    double k = 0.1;
    Imgproc.cornerHarris(Scene, Harris_scene,blockSize, apertureSize,k);
    Imgproc.cornerHarris(Object, Harris_object, blockSize,apertureSize,k);

    Core.normalize(Harris_scene, harris_scene_norm, 0, 255, Core.NORM_MINMAX, CvType.CV_32FC1, new Mat());
    Core.normalize(Harris_object, harris_object_norm, 0, 255, Core.NORM_MINMAX, CvType.CV_32FC1, new Mat());

    Core.convertScaleAbs(harris_scene_norm, harris_scene_scaled);
    Core.convertScaleAbs(harris_object_norm, harris_object_scaled);

    for( int j = 0; j < harris_scene_norm.rows() ; j++){
        for( int i = 0; i < harris_scene_norm.cols(); i++){
            if ((int) harris_scene_norm.get(j,i)[0] > thresh){
                Imgproc.circle(harris_scene_scaled, new Point(i,j), 5 , new Scalar(0), 2 ,8 , 0);
            }
        }
    }

    for( int j = 0; j < harris_object_norm.rows() ; j++){
        for( int i = 0; i < harris_object_norm.cols(); i++){
            if ((int) harris_object_norm.get(j,i)[0] > thresh){
                Imgproc.circle(harris_object_scaled, new Point(i,j), 5 , new Scalar(0), 2 ,8 , 0);
            }
        }
    }
 }

我刚刚编写了以下代码here

Answer 2

我知道这不是理想的，但它也不是那么糟糕 - 你可以查看c ++文档和示例，Java的翻译通常是直截了当的：一个例子：Harris corner detector。（你没有提到你的版本，这是从v2.4开始的。）

Answer 3

如果仍在寻找OpenCV Java示例，则可以在以下链接中找到它。

完成Java示例

https://github.com/opencv/opencv/tree/master/samples/java/tutorial_code

运动跟踪

https://github.com/opencv/opencv/tree/master/samples/java/tutorial_code/TrackingMotion

哈里斯拐角检测

https://github.com/opencv/opencv/blob/master/samples/java/tutorial_code/TrackingMotion/harris_detector/CornerHarrisDemo.java

OpenCV Java Harris角点检测

3 个答案: