public static void ApplySobelFilter(BitMapFile file, Direction type)
{
ApplyGreyFilter(file);
Rgb[,] newPic = new Rgb[file.ImageRgb.GetLength(0), file.ImageRgb.GetLength(1)];
CopyList(file.ImageRgb, newPic);
int edge = 80;
for (int i = 1; i < file.Height - 1; i++)
{
for (int j = 1; j < file.CountRowRgb - 1; j++)
{
int sumX = (file.ImageRgb[i + 1, j - 1].Red + 2 * file.ImageRgb[i + 1, j].Red + file.ImageRgb[i + 1, j + 1].Red) -
(file.ImageRgb[i - 1, j - 1].Red + 2 * file.ImageRgb[i - 1, j].Red + file.ImageRgb[i - 1, j + 1].Red);
int sumY = (file.ImageRgb[i - 1, j + 1].Red + 2 * file.ImageRgb[i, j + 1].Red + file.ImageRgb[i + 1, j + 1].Red) -
(file.ImageRgb[i - 1, j - 1].Red + 2 * file.ImageRgb[i, j - 1].Red + file.ImageRgb[i + 1, j - 1].Red);
switch ((int)type)
{
case 0:
newPic[i, j].Red = newPic[i, j].Green = newPic[i, j].Blue = Math.Abs(sumX) <= edge ? (byte)0 : (byte)255;
break;
case 1:
newPic[i, j].Red = newPic[i, j].Green = newPic[i, j].Blue = Math.Sqrt(Math.Pow(sumX, 2) + Math.Pow(sumY, 2)) <= edge ? (byte)0 : (byte)255;
break;
case 2:
newPic[i, j].Red = newPic[i, j].Green = newPic[i, j].Blue = Math.Abs(sumY) <= edge ? (byte)0 : (byte)255;
break;
}
}
}
CopyList(newPic, file.ImageRgb);
}
public static void ApplyMiddleFilter(BitMapFile file)
{
for (int i = 1; i < file.Height - 1; i++)
{
for (int j = 1; j < file.CountRowRgb - 1; j++)
{
byte[] midArrRed = new byte[9], midArrGreen = new byte[9], midArrBlue = new byte[9];
int index = 0;
for (int k = -1; k <= 1; k++)
{
for (int p = -1; p <= 1; p++)
{
midArrRed[index] = file.ImageRgb[i + k, j + p].Red;
midArrGreen[index] = file.ImageRgb[i + k, j + p].Green;
midArrBlue[index] = file.ImageRgb[i + k, j + p].Blue;
index++;
}
}
Array.Sort(midArrRed);
Array.Sort(midArrGreen);
Array.Sort(midArrBlue);
file.ImageRgb[i, j].Red = midArrRed[4];
file.ImageRgb[i, j].Green = midArrGreen[4];
file.ImageRgb[i, j].Blue = midArrBlue[4];
}
}
}
public static void ApplyGreyFilter(BitMapFile file)
{
for (int i = 0; i < file.Height; i++)
{
for (int j = 0; j < file.CountRowRgb; j++)
{
file.ImageRgb[i, j].Red = file.ImageRgb[i, j].Green = file.ImageRgb[i, j].Blue = GreyScale(file.ImageRgb[i, j]);
}
}
}
public static void ApplyGauss3x3Filter(BitMapFile file)
{
int[,] gaussMatrix = { { 1, 2, 1 }, { 2, 4, 2 }, { 1, 2, 1 } };
for (int i = 1; i < file.Height - 1; i++)
{
for (int j = 1; j < file.CountRowRgb - 1; j++)
{
int redKoef = 0, greenKoef = 0, blueKoef = 0;
for (int k = -1; k <= 1; k++)
{
for (int p = -1; p <= 1; p++)
{
redKoef += file.ImageRgb[i + k, j + p].Red * gaussMatrix[k + 1, p + 1];
greenKoef += file.ImageRgb[i + k, j + p].Green * gaussMatrix[k + 1, p + 1];
blueKoef += file.ImageRgb[i + k, j + p].Blue * gaussMatrix[k + 1, p + 1];
}
}
file.ImageRgb[i, j].Red = Convert.ToByte(redKoef / 16);
file.ImageRgb[i, j].Green = Convert.ToByte(greenKoef / 16);
file.ImageRgb[i, j].Blue = Convert.ToByte(blueKoef / 16);
}
}
}
