public static ICollection <PossibleChar> FindGroupOfMatchingChars(PossibleChar possibleChar, ICollection <PossibleChar> listOfpossibleChars)
{
var vectorOfMatchingChars = new List <PossibleChar>();
foreach (var possibleMatchingChar in listOfpossibleChars)
{
if (possibleMatchingChar.Equals(possibleChar))
{
// then we should not include it in the vector of matches b/c that would end up double including the current char
continue; // so do not add to vector of matches and jump back to top of for loop
}
// compute stuff to see if chars are a match
double dblDistanceBetweenChars = DistanceBetweenChars(possibleChar, possibleMatchingChar);
double dblAngleBetweenChars = AngleBetweenChars(possibleChar, possibleMatchingChar);
double dblChangeInArea = (double)Math.Abs(possibleMatchingChar.BoundingRectArea - possibleChar.BoundingRectArea) / (double)possibleChar.BoundingRectArea;
double dblChangeInWidth = (double)Math.Abs(possibleMatchingChar.BoundingRect.Width - possibleChar.BoundingRect.Width) / (double)possibleChar.BoundingRect.Width;
double dblChangeInHeight = (double)Math.Abs(possibleMatchingChar.BoundingRect.Height - possibleChar.BoundingRect.Height) / (double)possibleChar.BoundingRect.Height;
// check if chars match
if (dblDistanceBetweenChars < (possibleChar.DblDiagonalSize * Program.MAX_DIAG_SIZE_MULTIPLE_AWAY) &&
dblAngleBetweenChars < Program.MAX_ANGLE_BETWEEN_CHARS &&
dblChangeInArea < Program.MAX_CHANGE_IN_AREA &&
dblChangeInWidth < Program.MAX_CHANGE_IN_WIDTH &&
dblChangeInHeight < Program.MAX_CHANGE_IN_HEIGHT)
{
vectorOfMatchingChars.Add(possibleMatchingChar); // if the chars are a match, add the current char to vector of matching chars
}
}
return(vectorOfMatchingChars);
}
public static double DistanceBetweenChars(PossibleChar firstChar, PossibleChar secondChar)
{
int intX = Math.Abs(firstChar.IntCenterX - secondChar.IntCenterX);
int intY = Math.Abs(firstChar.IntCenterY - secondChar.IntCenterY);
return(Math.Sqrt(Math.Pow(intX, 2) + Math.Pow(intY, 2)));
}
public static double AngleBetweenChars(PossibleChar firstChar, PossibleChar secondChar)
{
double dblAdj = Math.Abs(firstChar.IntCenterX - secondChar.IntCenterX);
double dblOpp = Math.Abs(firstChar.IntCenterY - secondChar.IntCenterY);
double dblAngleInRad = Math.Atan(dblOpp / dblAdj);
double dblAngleInDeg = dblAngleInRad * (180.0 / Cv2.PI);
return(dblAngleInDeg);
}
private static List <PossibleChar> GetPossibleCharsFromContours(IEnumerable <Point[]> contours, ref Mat imageContours)
{
var result = new List <PossibleChar>();
for (int i = 0; i < contours.Count(); ++i)
{
Cv2.DrawContours(imageContours, contours, i, Program.ScalarWhite);
var possibleChar = new PossibleChar(contours.ElementAt(i));
if (CheckIfPossibleChar(possibleChar))
{
result.Add(possibleChar);
}
}
return(result);
}
public static bool CheckIfPossibleChar(PossibleChar possibleChar) => possibleChar.BoundingRectArea > Program.MIN_PIXEL_AREA && possibleChar.BoundingRect.Width > Program.MIN_PIXEL_WIDTH && possibleChar.BoundingRect.Height > Program.MIN_PIXEL_HEIGHT && possibleChar.DblAspectRatio > Program.MIN_ASPECT_RATIO && possibleChar.DblAspectRatio < Program.MAX_ASPECT_RATIO;
