private Mat FindContoursAndDraw(Bitmap originalMap, string objectName, int minArea = 500, int maxArea = 10000)
{
//var houghBitmap = HoughTransform(originalMap);
//var invertedHoughBitmap = InvertImage(houghBitmap);
Mat originalMat = BitmapConverter.ToMat(originalMap);
//Mat invertedHoughMat = BitmapConverter.ToMat(invertedHoughBitmap);
Mat blackWhiteMat = new Mat();
Mat edgesMat = new Mat();
Cv2.CvtColor(originalMat, blackWhiteMat, ColorConversionCodes.BGRA2GRAY);
if (MapObjectsColors.GetInstance().Tight.Contains(objectName))
{
Bitmap edgesMap = BitmapConverter.ToBitmap(blackWhiteMat);
edgesMap = ImageFilter.SobelFilter(edgesMap, grayscale: true);
edgesMat = BitmapConverter.ToMat(edgesMap);
Cv2.CvtColor(edgesMat, edgesMat, ColorConversionCodes.BGRA2GRAY);
}
else
{
Cv2.Canny(blackWhiteMat, edgesMat, 50, 100);
}
OpenCvSharp.Point[][] contours;
HierarchyIndex[] hierarchyIndexes;
Cv2.FindContours(
edgesMat,
out contours,
out hierarchyIndexes,
mode: RetrievalModes.CComp,
method: ContourApproximationModes.ApproxSimple);
var componentCount = 0;
var contourIndex = 0;
var objectDict = mapObjects.getObjectDictionary();
if (contours.Length != 0)
{
if (objectDict.ContainsKey(objectName))
{
objectDict[objectName] = contours;
}
else
{
objectDict.Add(objectName, contours);
}
while ((contourIndex >= 0))
{
var contour = contours[contourIndex];
var boundingRect = Cv2.BoundingRect(contour);
var boundingRectArea = boundingRect.Width * boundingRect.Height;
var ca = Cv2.ContourArea(contour) * Convert.ToDouble(scaleBox.SelectedItem) / 100;
var cal = Cv2.ArcLength(contour, closed: true) * Convert.ToDouble(scaleBox.SelectedItem) / 100;
//if (boundingRectArea > minArea)
//{
Cv2.PutText(originalMat, $"A:{ca.ToString("#.##")} km2", new OpenCvSharp.Point(boundingRect.X, boundingRect.Y + 10), HersheyFonts.HersheyPlain, 1, Scalar.White, 1);
Cv2.PutText(originalMat, $"L:{cal.ToString("#.##")} km", new OpenCvSharp.Point(boundingRect.X, boundingRect.Y + 25), HersheyFonts.HersheyPlain, 1, Scalar.White, 1);
//}
//Cv2.DrawContours(
// originalMat,
// contours,
// contourIndex,
// color: Scalar.All(componentCount + 1),
// thickness: -1,
// lineType: LineTypes.Link8,
// hierarchy: hierarchyIndexes,
// maxLevel: int.MaxValue);
componentCount++;
contourIndex = hierarchyIndexes[contourIndex].Next;
}
}
return(originalMat);
}
