/// <summary>
/// Applies the box filter kernel around one pixel.
/// </summary>
/// <param name="original">The original image to blur</param>
/// <param name="target">The result</param>
/// <param name="centerRow">Vertical coordinate of the result pixel</param>
/// <param name="centerCol">Horizontal coordinate of the result pixel</param>
protected virtual void Kernel(ImageBase original, ImageBase target, int centerRow, int centerCol)
{
int top = Math.Max(0, centerRow - radius);
int bottom = Math.Min(original.Height - 1, centerRow + radius);
int left = Math.Max(0, centerCol - radius);
int right = Math.Min(original.Width - 1, centerCol + radius);
int area = (bottom - top + 1) * (right - left + 1);
float normalization = 1.0f / area;
for (int chan = 0; chan < original.NumChannels; ++chan)
{
float result = 0;
for (int row = top; row <= bottom; ++row)
{
for (int col = left; col <= right; ++col)
{
result += original.GetPixelChannel(col, row, chan) * normalization;
}
}
target.SetPixelChannel(centerCol, centerRow, chan, result);
}
}
