/// <summary>
/// Filters unwanted contours by checking their width and height based on defined min/max values.
/// </summary>
/// <param name="contours"></param>
/// <param name="min"></param>
/// <param name="max"></param>
/// <returns>Filtered list of contours and their bounding boxes</returns>
public (IList <MatOfPoint>, List <Rect>) FilterContoursBySize(IList <MatOfPoint> contours, int min, int max)
{
IList <MatOfPoint> filteredContours = new JavaList <MatOfPoint>();
List <Rect> boundingBoxes = new List <Rect>();
foreach (MatOfPoint contour in contours)
{
Rect bounds = Imgproc.BoundingRect(contour);
if (bounds.Height > min && bounds.Height < max && bounds.Width > 10 && bounds.Width < bounds.Height)
{
boundingBoxes.Add(bounds);
filteredContours.Add(contour);
}
}
return(filteredContours, boundingBoxes);
}
/// <summary>
/// Filters unwanted contours by checking the amount of similar contours on the same horizontal coordinates.
/// </summary>
/// <param name="contours"></param>
/// <param name="bounds"></param>
/// <returns>List of matching contours and their bounding boxes</returns>
public (IList <MatOfPoint>, List <Rect>) FilterContoursByYPosition(IList <MatOfPoint> contours, List <Rect> bounds)
{
IList <MatOfPoint> alignedContours = new JavaList <MatOfPoint>();
IList <MatOfPoint> tmpC;
List <Rect> alignedBounds = new List <Rect>();
List <Rect> tmpB;
for (int i = 0; i < bounds.Count; i++)
{
Rect bound = bounds[i];
tmpC = new JavaList <MatOfPoint>()
{
contours[i]
};
tmpB = new List <Rect>()
{
bound
};
for (int j = i + 1; j < bounds.Count; j++)
{
Rect bound2 = bounds[j];
if (bound.Y - bound2.Y < 30 && bound2.X > bound.X + bound.Width)
{
tmpB.Add(bound2);
tmpC.Add(contours[j]);
}
}
if (tmpB.Count > alignedBounds.Count)
{
alignedContours = tmpC;
alignedBounds = tmpB;
}
}
return(alignedContours, alignedBounds);
}
public Mat DrawRectangle(Mat mat, Rect rect, Scalar colour)
{
Imgproc.Rectangle(mat, new Point(rect.X - 2, rect.Y - 2), new Point(rect.X + rect.Width + 2, rect.Y + rect.Height + 2), new Scalar(0, 255, 0));
return(mat);
}
