public static Int32[] BaseFilter(Int32[] pixels, ImageSize size, Func<Int32, Int32, Int32> func)
{
Func<Int32, Int32, bool> isValid = (y, x) => ((x > 0 && y > 0) && (x < size.X && y < size.Y));
if ((size.X * size.Y) != pixels.LongLength)
throw new ApplicationException();
Int32[] outPixels = new Int32[pixels.Length];
for (Int32 i = 0; i < size.Y; ++i)
{
for (Int32 j = 0; j < size.X; ++j)
{
Int32 min = pixels[i * size.X + j];
for (Int32 i1 = -1; i1 <= 1; ++i1)
{
for (Int32 j1 = -1; j1 <= 1; ++j1)
{
if (isValid(i + i1, j + j1))
{
min = func(pixels[(i + i1) * size.X + (j + j1)], min);
}
}
}
outPixels[i * size.X + j] = min;
}
}
return outPixels;
}
public static Int32[] MinFilter(Int32[] pixels, ImageSize size)
{
return BaseFilter(pixels, size, Math.Min);
}
public static Int32[] MaxMinFilter(Int32[] pixels, ImageSize size)
{
isMin = !isMin;
return (isMin ? MinFilter(pixels, size) : MaxFilter(pixels, size));
}
public Image(Int32[] pixels, ImageSize size)
{
Size = size;
SetPixels(pixels);
}