opencv 腐蚀

public Mat erodeMat(Mat src) {
        // 读取图像
        //Mat src = Imgcodecs.imread("test.pgm");

        // 定义结构元素
        Mat kernel = new Mat(31, 31, CvType.CV_8UC1, new Scalar(1));
        Point anchor = new Point(-1, -1);
        double delta = 0;
        int ddepth = -1;

        // 膨胀图像
        Mat dst = new Mat();
        //Imgproc.dilate(src, dst, kernel, anchor, 1);
        Imgproc.erode(src, dst, kernel);
        
        return dst;
}