public static Bitmap SmoothFilterMedian(this Bitmap bitmap)
{
Bitmap change = new Bitmap(bitmap);
change = change.AddPadding(1);
Bitmap ret = new Bitmap(bitmap.Width, bitmap.Height);
List <int> termsList = new List <int>();
for (int i = 1; i < change.Width - 1; i++)
{
for (int j = 1; j < change.Height - 1; j++)
{
for (int x = i - 1; x <= i + 1; x++)
{
for (int y = j - 1; y <= j + 1; y++)
{
Color c = change.GetPixel(x, y);
termsList.Add(c.R);
}
}
int[] terms = termsList.ToArray();
termsList.Clear();
Array.Sort <int>(terms);
Array.Reverse(terms);
int color = terms[4];
ret.SetPixel(i - 1, j - 1, Color.FromArgb(color, color, color));
}
}
return(ret);
}
public static Bitmap SmoothFilterMean(this Bitmap bitmap)
{
Bitmap change = new Bitmap(bitmap);
change = change.AddPadding(1);
Bitmap ret = new Bitmap(bitmap.Width, bitmap.Height);
Color color;
float sumR = 0;
float sumG = 0;
float sumB = 0;
for (int i = 1; i < change.Width - 1; i++)
{
for (int j = 1; j < change.Height - 1; j++)
{
for (int x = i - 1; x <= i + 1; x++)
{
for (int y = j - 1; y <= j + 1; y++)
{
color = change.GetPixel(x, y);
sumR = sumR + color.R;
sumG = sumG + color.G;
sumB = sumB + color.B;
}
}
int meanR = (int)Math.Round(sumR / 9, 10);
int meanG = (int)Math.Round(sumG / 9, 10);
int meanB = (int)Math.Round(sumB / 9, 10);
ret.SetPixel(i - 1, j - 1, Color.FromArgb(meanR, meanG, meanB));
sumR = 0;
sumG = 0;
sumB = 0;
}
}
return(ret);
}
public static Bitmap SobelEdgeDetection(this Bitmap bitmap, SobelEdgeType type)
{
Bitmap change = new Bitmap(bitmap);
change = change.ToGrayScale();
change = change.AddPadding(1);
Bitmap ret = new Bitmap(bitmap.Width, bitmap.Height);
int[][] sobelx =
{
new int[] { -1, 0, 1 },
new int[] { -2, 0, 2 },
new int[] { -1, 0, 1 }
};
int[][] sobely =
{
new int[] { -1, -2, -1 },
new int[] { 0, 0, 0 },
new int[] { 1, 2, 1 }
};
int dx = 0;
int dy = 0;
switch (type)
{
case SobelEdgeType.Vertical:
for (int i = 1; i < change.Width - 1; i++)
{
for (int j = 1; j < change.Height - 1; j++)
{
for (int x = i - 1; x <= i + 1; x++)
{
for (int y = j - 1; y <= j + 1; y++)
{
dx += (change.GetPixel(x, y).R *sobely[x - i + 1][y - j + 1]);
dy += (change.GetPixel(x, y).R *sobely[x - i + 1][y - j + 1]);
}
}
double derivata = Math.Sqrt((dx * dx) + (dy * dy));
if (derivata > 255)
{
ret.SetPixel(i - 1, j - 1, Color.Black);
}
else
{
ret.SetPixel(i - 1, j - 1, Color.FromArgb(255, (int)derivata, (int)derivata, (int)derivata));
}
dx = 0;
dy = 0;
}
}
break;
case SobelEdgeType.Horizontal:
for (int i = 1; i < change.Width - 1; i++)
{
for (int j = 1; j < change.Height - 1; j++)
{
for (int x = i - 1; x <= i + 1; x++)
{
for (int y = j - 1; y <= j + 1; y++)
{
dx += (change.GetPixel(x, y).R *sobelx[x - i + 1][y - j + 1]);
dy += (change.GetPixel(x, y).R *sobelx[x - i + 1][y - j + 1]);
}
}
double derivata = Math.Sqrt((dx * dx) + (dy * dy));
if (derivata > 255)
{
ret.SetPixel(i - 1, j - 1, Color.Black);
}
else
{
ret.SetPixel(i - 1, j - 1, Color.FromArgb(255, (int)derivata, (int)derivata, (int)derivata));
}
dx = 0;
dy = 0;
}
}
break;
case SobelEdgeType.Combined:
for (int i = 1; i < change.Width - 1; i++)
{
for (int j = 1; j < change.Height - 1; j++)
{
for (int x = i - 1; x <= i + 1; x++)
{
for (int y = j - 1; y <= j + 1; y++)
{
dx += (change.GetPixel(x, y).R *sobelx[x - i + 1][y - j + 1]);
dy += (change.GetPixel(x, y).R *sobely[x - i + 1][y - j + 1]);
}
}
double derivata = Math.Sqrt((dx * dx) + (dy * dy));
if (derivata > 255)
{
ret.SetPixel(i - 1, j - 1, Color.Black);
}
else
{
ret.SetPixel(i - 1, j - 1, Color.FromArgb(255, (int)derivata, (int)derivata, (int)derivata));
}
dx = 0;
dy = 0;
}
}
break;
}
return(ret);
}
