public static BMPReader convolution(BMPReader image, float[,] mat)
{
Color[,] image1 = image.Clone();
for (int x = 0; x < image.width; x++)
{
for (int y = 0; y < image.height; y++)
{
int matx = mat.GetLength(0) / 2;
float R = 0f, G = 0f, B = 0f;
for (int i = -matx; i < matx; i++)
{
int maty = mat.GetLength(1) / 2;
for (int j = -maty; j < maty; j++)
{
if (IsValid(x - i, y - j, image.width, image.height))
{
int a = matx + i, b = maty + j;
R += mat[a, b] * image1[x - i, y - j].R;
G += mat[a, b] * image1[x - i, y - j].G;
B += mat[a, b] * image1[x - i, y - j].B;
}
}
}
image.set_pixel(x, y, Color.FromArgb(image1[x, y].A, Clamp((int)R, 0, 255), Clamp((int)G, 0, 255), Clamp((int)B, 0, 255)));
}
}
return(image);
}
public static BMPReader binarize(BMPReader image, int threshold)
{
for (int i = 0; i < image.height; i++)
{
for (int j = 0; j < image.width; j++)
{
Color color = image.get_pixel(j, i);
if ((color.R + color.G + color.B) / 3 < threshold)
{
image.set_pixel(j, i, Color.White);
}
else
{
image.set_pixel(j, i, Color.Black);
}
}
}
return(image);
}
public static BMPReader to_grey(BMPReader image)
{
for (int i = 0; i < image.height; i++)
{
for (int j = 0; j < image.width; j++)
{
Color color = image.get_pixel(j, i);
int grey = (int)(color.R * .3f + color.G * .59 + color.B * .11);
image.set_pixel(j, i, Color.FromArgb(grey, grey, grey, grey));
}
}
return(image);
}