/// <summary>
/// Gets the average colors of this points
/// </summary>
/// <param name="bmp"></param>
/// <param name="Points"></param>
/// <returns></returns>
public static Color AverageColor(this LockBitmap bitmap, IEnumerable <Point> Points)
{
//Used for tally
int r = 0;
int g = 0;
int b = 0;
int total = 0;
foreach (var p in Points)
{
Color clr = bitmap[p.X, p.Y];
r += clr.R;
g += clr.G;
b += clr.B;
total++;
}
//Calculate average
r /= total;
g /= total;
b /= total;
return(Color.FromArgb(r, g, b));
}
/// <summary>
/// Mark the path
/// </summary>
/// <param name="bitmap"></param>
/// <returns></returns>
public static void ChangeColor(this LockBitmap bitmap, IEnumerable <Point> Path, Color Color)
{
foreach (var item in Path)
{
bitmap.SetPixel(item.X, item.Y, Color);
}
}
public static KeyValuePair <Bitmap, int> HasLogo(Bitmap source, int minShapes, int MinPixels = 30, int MaxPixels = 150)
{
var sourceData = new LockBitmap(source);
var target = new Bitmap(source.Width, source.Height, PixelFormat.Format24bppRgb);
var targetData = new LockBitmap(target);
sourceData.LockBits();
targetData.LockBits();
try
{
//Filter the shapes similar to logo
var closedPaths = sourceData.FindClosedAreas(MinPixels, MaxPixels);
var shapesFopund = closedPaths.Count;
if (closedPaths.Count >= minShapes)
{
closedPaths = closedPaths.FindShapesInCirclesBorder(minShapes);
foreach (var item in closedPaths)
{
// var cmykColors= item.ConvertAll(c => ColorSpaceHelper.RGBtoCMYK(sourceData[c.X, c.Y]));
targetData.ChangeColor(item, Color.Red);
}
}
var conf = closedPaths.Count < minShapes ? 0 : 100 - Math.Abs(closedPaths.Count - 5) * 20;
return(new KeyValuePair <Bitmap, int>(target, conf));
}
finally
{
sourceData.UnlockBits();
targetData.UnlockBits();
//bitmap.Save("c:\\d\\logo.png");
}
}
/// <summary>
/// Finds all areas with this color
/// </summary>
public static List <Point> GetConnectedPixels(this LockBitmap bitmap, int X, int Y, Predicate <Point> NavigateToThisPoint)
{
var path = new Dictionary <Point, int>();
Queue q = new Queue();
path[new Point(X, Y)] = 0;
q.Enqueue(new Point(X, Y));
var pixelColor = bitmap[X, Y];
while (q.Count > 0)
{
var p = (Point)q.Dequeue();
X = p.X;
Y = p.Y;
for (int i = 1; i <= 4; i++)
{
int x2 = X;
int y2 = Y;
switch (i)
{
case 1: //left
x2--;
break;
case 2: //Right
x2++;
break;
case 3: //down
y2++;
break;
case 4: //up
y2--;
break;
}
if (x2 < bitmap.Width && x2 >= 0 && y2 < bitmap.Height && y2 >= 0)
{
var p2 = new Point(x2, y2);
if (!path.ContainsKey(p2) && bitmap[x2, y2].IsSimilarTo(pixelColor) && (NavigateToThisPoint == null || NavigateToThisPoint(p2)))
{
q.Enqueue(p2);
path[p2] = 0;
}
}
}
}
return(path.Keys.ToList());
}
/// <summary>
/// Finds all closed paths with the same color
/// </summary>
/// <param name="bitmap"></param>
/// <returns></returns>
public static List <List <Point> > FindClosedAreas(this LockBitmap bitmap, int MinPixelsCount, int MaxPixelsCount)
{
var paths = new List <List <Point> >();
var added = new Dictionary <Point, int>();
var pixels = bitmap.Points.ToList();
while (pixels.Count > 0)
{
var path = GetConnectedPixels(bitmap, pixels[0].X, pixels[0].Y, p => !added.ContainsKey(p));
foreach (var item in path)
{
added[item] = 0;
}
paths.Add(path);
pixels = pixels.Except(path).ToList();
}
paths.RemoveAll(c => c.Count <MinPixelsCount || c.Count> MaxPixelsCount);
// paths.Sort((c1, c2) => c2.Count.CompareTo(c1.Count));
return(paths);
}
