//read image
// var refMat = new Mat("001f.png", ImreadModes.Unchanged);
// var tplMat = new Mat("001.png", ImreadModes.Unchanged);
using (Mat refMat = new Mat("001f.png", ImreadModes.Unchanged))
using (Mat tplMat = new Mat("001.png", ImreadModes.Unchanged))
using (Mat res = new Mat(refMat.Rows - tplMat.Rows + 1, refMat.Cols - tplMat.Cols + 1, MatType.CV_32FC1))
{
//Convert input images to gray
Mat gref = refMat.CvtColor(ColorConversionCodes.BGR2GRAY);
Mat gtpl = tplMat.CvtColor(ColorConversionCodes.BGR2GRAY);
Cv2.MatchTemplate(gref, gtpl, res, TemplateMatchModes.CCoeffNormed);
Cv2.Threshold(res, res, 0.8, 1.0, ThresholdTypes.Tozero);
while (true)
{
double minval, maxval, threshold = 0.8;
Point minloc, maxloc;
Cv2.MinMaxLoc(res, out minval, out maxval, out minloc, out maxloc);
if (maxval >= threshold)
{
//draw a rectangle of the matching area
Rect r = new Rect(new Point(maxloc.X, maxloc.Y), new Size(tplMat.Width, tplMat.Height));
Cv2.Rectangle(refMat, r, Scalar.Red, 2);
//debug
String msg =
$"MinVal={minval.ToString()} MaxVal={maxval.ToString()} MinLoc={minloc.ToString()} MaxLoc={maxloc.ToString()} Rect={r.ToString()}";
Console.WriteLine(msg);
//fill in the res mat so you don't find the same area again in the minmaxloc
//Rect outRect;
//Cv2.FloodFill(res, maxloc, new Scalar(0), out outRect, new Scalar(0.1), new Scalar(1.0), FloodFillFlags.Link4);
Cv2.FloodFill(res, maxloc, new Scalar(0));
}
else
{
break;
}
}
}