protected static int Normalize(double value, ConvolutionFilter filter)
{
if (filter.Divisor == 0)
{
filter.Divisor = 1;
}
return(Math.Min(Math.Max((int)(value / filter.Divisor + filter.Offset), 0), 255));
}
public Bitmap ComputeWith(ConvolutionFilter filter)
{
var result = new Bitmap(original.Width, original.Height);
var offset = filter.Size / 2;
filter.Offset = 0;
for (int i = 0; i < filter.Size; i++)
{
for (int j = 0; j < filter.Size; j++)
{
filter.Divisor += (int)filter._matrix[i, j];
}
}
if (filter.Divisor == 0)
{
filter.Divisor = 1;
}
for (int x = 0; x < original.Width; x++)
{
for (int y = 0; y < original.Height; y++)
{
var colorMap = new Color[filter.Size, filter.Size];
for (int filterY = 0; filterY < filter.Size; filterY++)
{
int pk = (filterY + x - offset <= 0) ? 0 :
(filterY + x - offset >= original.Width - 1) ? original.Width - 1 : filterY + x - offset;
for (int filterX = 0; filterX < filter.Size; filterX++)
{
int pl = (filterX + y - offset <= 0) ? 0 :
(filterX + y - offset >= original.Height - 1) ? original.Height - 1 : filterX + y - offset;
colorMap[filterY, filterX] = original.GetPixel(pk, pl);
}
}
result.SetPixel(x, y, colorMap * filter);
}
}
original = result;
return(result);
}