public void Run()
{
var dst = new Mat(FilePath.Lenna, LoadMode.Color);
var gray = new Mat(FilePath.Lenna, LoadMode.GrayScale);
StarDetector detector = new StarDetector(45);
KeyPoint[] keypoints = detector.Run(gray);
if (keypoints != null)
{
var color = new Scalar(0, 255, 0);
foreach (KeyPoint kpt in keypoints)
{
float r = kpt.Size / 2;
Cv2.Circle(dst, kpt.Pt, (int)r, color, 1, LineType.Link8, 0);
Cv2.Line(dst,
new Point2f(kpt.Pt.X + r, kpt.Pt.Y + r),
new Point2f(kpt.Pt.X - r, kpt.Pt.Y - r),
color, 1, LineType.Link8, 0);
Cv2.Line(dst,
new Point2f(kpt.Pt.X - r, kpt.Pt.Y + r),
new Point2f(kpt.Pt.X + r, kpt.Pt.Y - r),
color, 1, LineType.Link8, 0);
}
}
using (new Window("StarDetector features", dst))
{
Cv.WaitKey();
}
}
/// <summary>
/// Extracts keypoints by C++-style code (cv::StarDetector)
/// </summary>
/// <param name="img"></param>
/// <param name="cimg"></param>
private void CppStyleStarDetector(IplImage img, IplImage cimg)
{
Mat src = new Mat(img, false);
Mat dst = new Mat(cimg, false);
StarDetector detector = new StarDetector(45);
KeyPoint[] keypoints = detector.GetKeyPoints(src);
if (keypoints != null)
{
foreach (KeyPoint kpt in keypoints)
{
float r = kpt.Size / 2;
CvCpp.Circle(dst, kpt.Pt, (int)r, new CvColor(0, 255, 0), 1, LineType.Link8, 0);
CvCpp.Line(dst, new CvPoint2D32f(kpt.Pt.X + r, kpt.Pt.Y + r), new CvPoint2D32f(kpt.Pt.X - r, kpt.Pt.Y - r), new CvColor(0, 255, 0), 1, LineType.Link8, 0);
CvCpp.Line(dst, new CvPoint2D32f(kpt.Pt.X - r, kpt.Pt.Y + r), new CvPoint2D32f(kpt.Pt.X + r, kpt.Pt.Y - r), new CvColor(0, 255, 0), 1, LineType.Link8, 0);
}
}
}
