public override int[][] TransformImage(Hashtable source)
{
if(source == null)
return null;
else
{
int[][] input = (int[][])source["image"];
int mask = (int)source["mask"];
double count = (double)(255.0 / (mask * mask)); //square mask
ColorHistogram h = new ColorHistogram(mask, mask);
int width = input.Length;
int height = input[0].Length;
Func<Histogram, int, byte> fn = (hi,current) => (byte)(count * (double)hi[0, current + 1]);
Func<int,int,IEnumerable<int>> grabNeighborhood = (px, py) => input.GrabNeighborhood(px, py, width, height, mask);
for(int x = 0; x < width; x++)
{
int[] iX = input[x];
Func<int,IEnumerable<int>> gX = (py) => grabNeighborhood(x,py);
//close over these values
for(int y = 0; y < height; y++)
{
Color c = Color.FromArgb(iX[y]);
h.Repurpose(gX(y));
iX[y] = Color.FromArgb(255, fn(h.Red, (int)c.R),
fn(h.Green, (int)c.G),
fn(h.Blue, (int)c.B)).ToArgb();
}
}
return input;
}
}
