private Bitmap Compute(Bitmap inputImage)
{
// Define output array
int[,] output;
// Get the grayscale image from src
int[,] grayscale = Grayscale.FromBitmap(inputImage);
int width = grayscale.GetLength(0);
int height = grayscale.GetLength(1);
// Detect edges using sobel
int[,] edges = Sobel.Compute(grayscale);
bool[,] strucElem =
{
{ false, true, false },
{ true, true, true },
{ false, true, false }
};
// Calculate white top-hat (WTH) with plus-shaped structuring element
int[,] wth = Defaults.Combine(edges, Morphologicals.Opening(edges, strucElem), (a, b) => a - b);
// Create thresholds from the WTH
int[,] wth60 = Threshold.Compute(wth, 60);
int[,] wth30 = Threshold.Compute(wth, 30);
// Calculate Hough transform
const double STEP_SIZE = 0.25;
int[,] hough = Hough.Compute(wth60, STEP_SIZE);
int[,] houghWindow = Window.Compute(hough, 20000, int.MaxValue);
// Find and filter lines from hough transform
SortedSet <Line> lines = Lines.FindLines(houghWindow, STEP_SIZE);
lines = Lines.FilterLines(lines);
strucElem = new bool[, ]
{
{ false, false, true, false, false },
{ false, true, true, true, false },
{ true, true, true, true, true },
{ false, true, true, true, false },
{ false, false, true, false, false }
};
// Find all rectangles that somewhat resemble a card shape
IList <Card> cards = Lines.FindCardShapedRectangles(lines, width, height);
// Filter all card shaped rectangles with enough line support
int[,] dilation = Morphologicals.Dilation(wth60, strucElem);
IList <Card> filteredCards = Lines.FilterCardShapedRectangles(dilation, cards);
// Set the output image, convert it to a bitmap and create a graphics object so we can draw on it
switch (outputSelector.SelectedIndex)
{
default:
case 0:
output = grayscale;
break;
case 1:
output = edges;
break;
case 2:
output = wth;
break;
case 3:
output = wth60;
break;
case 4:
output = wth30;
break;
case 5:
output = dilation;
break;
case 6:
output = hough;
break;
}
Bitmap outputImage = Grayscale.ToBitmap(Defaults.Normalize(output));
if (output == hough)
{
return(outputImage);
}
Graphics g = Graphics.FromImage(outputImage);
// Draw the filtered lines
if (drawFilteredLinesCheckbox.Checked)
{
DrawLines(lines, g, outputImage.Width, outputImage.Height);
}
// Draw the potential cards (card-shaped rectangles)
if (drawFoundRectanglesCheckbox.Checked)
{
foreach (Card card in cards)
{
card.Draw(g, Pens.Yellow);
}
}
if (drawFilteredRectanglesCheckbox.Checked)
{
foreach (Card card in filteredCards)
{
card.Draw(g, Pens.Red);
}
}
// Classify and draw all filtered cards
foreach (Card card in filteredCards)
{
List <ShapeInfo> shapes = Shapes.Find(wth30, card);
if (shapes.Count > 10)
{
continue;
}
Suit suit = Shapes.ClassifyShapes(shapes);
if (suit != Suit.Unknown)
{
// Draw the bboxes of the shapes
if (drawBBCheckbox.Checked)
{
DrawShapes(shapes, g);
}
// Draw the card outline
if (drawFoundCardsCheckbox.Checked)
{
card.Draw(g);
}
// Format the card name and print it on the card
string cardName = String.Format("{0} of {1}", shapes.Count == 1 ? "Ace" : shapes.Count.ToString(), suit);
g.DrawString(cardName, new Font("Arial", 14), Brushes.Orange, new PointF(card.bottomLeft.X, card.bottomLeft.Y + 4));
Console.WriteLine(cardName);
}
}
return(outputImage);
}