public static Complex[][] FftTransform(Bitmap original)
{
LockBitmap originalBitmapLock = new LockBitmap(original);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
Complex[][] pixelsData = FourierUtil.BitmapToComplex(originalBitmapLock);
Complex[][] afterForwardComplex = FourierUtil.FftDit2d(pixelsData);
FourierUtil.SwapQuadrants(afterForwardComplex);
originalBitmapLock.UnlockBits();
return(afterForwardComplex);
}
public static Bitmap TransformResultToBitmap(float[,] transform)
{
int size = transform.GetLength(1);
Bitmap resultBitmap = new Bitmap(size, size);
LockBitmap resultBitmapLock = new LockBitmap(resultBitmap);
resultBitmapLock.LockBits(ImageLockMode.WriteOnly);
float max = 0.0f;
for (int i = 0; i < size; i++)
{
for (int j = 0; j < size; j++)
{
if (max < transform[i, j])
{
max = transform[i, j];
}
}
}
for (int i = 0; i < size; i++)
{
for (int j = 0; j < size; j++)
{
if (!float.IsNaN(transform[i, j]))
{
float pixelValue = transform[i, j];
Color color = Color.FromArgb(
(int)(pixelValue / max * Colors.MAX_PIXEL_VALUE),
(int)(pixelValue / max * Colors.MAX_PIXEL_VALUE),
(int)(pixelValue / max * Colors.MAX_PIXEL_VALUE));
resultBitmapLock.SetPixel(i, j, color);
}
}
}
resultBitmapLock.UnlockBits();
return(resultBitmap);
}
public static Bitmap GrayMode(Bitmap original)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
Color temp = originalBitmapLock.GetPixel(i, j);
int gray = (int)(0.299 * temp.R + 0.587 * temp.G + 0.114 * temp.B);
processedBitmapLock.SetPixel(i, j, Color.FromArgb(temp.A, (byte)gray, (byte)gray, (byte)gray));
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}
public static int[][] Histogram(Bitmap original)
{
LockBitmap originalBitmapLock = new LockBitmap(original);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
int[][] value = new int[3][]
{
new int[256],
new int[256],
new int[256]
};
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
value[0][originalBitmapLock.GetPixel(i, j).R]++;
value[1][originalBitmapLock.GetPixel(i, j).G]++;
value[2][originalBitmapLock.GetPixel(i, j).B]++;
}
}
originalBitmapLock.UnlockBits();
return(value);
}
public static Bitmap Contrast(Bitmap original, int factor)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
if (factor != 0)
{
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
double a = 0;
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
if (factor <= 0)
{
a = 1.0 + factor / 256.0;
}
else
{
a = 256.0 / Math.Pow(2, Math.Log(257 - factor, 2));
}
Color temp = originalBitmapLock.GetPixel(i, j);
int R = (int)(a * (temp.R - 128) + 128);
int G = (int)(a * (temp.G - 128) + 128);
int B = (int)(a * (temp.B - 128) + 128);
if (R > 255)
{
R = 255;
}
if (G > 255)
{
G = 255;
}
if (B > 255)
{
B = 255;
}
if (R < 0)
{
R = 0;
}
if (G < 0)
{
G = 0;
}
if (B < 0)
{
B = 0;
}
processedBitmapLock.SetPixel(i, j, Color.FromArgb(temp.A, (byte)R, (byte)G, (byte)B));
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}
else
{
return(original);
}
}
public static Bitmap uolisaFilter(Bitmap original)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
for (int i = 0; i < originalBitmapLock.Width; i++)
{
int x1 = i + 1;
int x0 = i - 1;
if (x0 < 0)
{
x0 = 0;
}
if (x1 >= originalBitmapLock.Width)
{
x1 = originalBitmapLock.Width - 1;
}
for (int j = 0; j < originalBitmapLock.Height; j++)
{
int y0 = j - 1;
int y1 = j + 1;
if (y0 < 0)
{
y0 = 0;
}
if (y1 >= originalBitmapLock.Height)
{
y1 = originalBitmapLock.Height - 1;
}
double px = (originalBitmapLock.GetPixel(i, y0).R *originalBitmapLock.GetPixel(i, y1).R *
originalBitmapLock.GetPixel(x0, j).R *originalBitmapLock.GetPixel(x1, j).R);
double pxx = (Math.Pow(originalBitmapLock.GetPixel(i, j).R, 4));
double log = Math.Log(pxx / px);
int R = (int)(255 * (log / 4.0));
int G = (int)(255 * (Math.Log(
((Math.Pow(originalBitmapLock.GetPixel(i, j).G, 4) * 1.0) /
(originalBitmapLock.GetPixel(i, y0).G *originalBitmapLock.GetPixel(i, y1).G *
originalBitmapLock.GetPixel(x0, j).G *originalBitmapLock.GetPixel(x1, j).G)
)) / 4.0));
int B = (int)(255 * (Math.Log(
((Math.Pow(originalBitmapLock.GetPixel(i, j).B, 4) * 1.0) /
(originalBitmapLock.GetPixel(i, y0).B *originalBitmapLock.GetPixel(i, y1).B *
originalBitmapLock.GetPixel(x0, j).B *originalBitmapLock.GetPixel(x1, j).B)
)) / 4.0));
if (R > 255)
{
R = 255;
}
if (G > 255)
{
G = 255;
}
if (B > 255)
{
B = 255;
}
if (R < 0)
{
R = 0;
}
if (G < 0)
{
G = 0;
}
if (B < 0)
{
B = 0;
}
if (B < 0)
{
B = 0;
}
processedBitmapLock.SetPixel(i, j, Color.FromArgb(originalBitmapLock.GetPixel(i, j).A, (byte)R, (byte)G, (byte)B));
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}
public static Bitmap southFilter(Bitmap original)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
int tempR;
int tempG;
int tempB;
int x1 = i - 1;
int x2 = i + 1;
if (x1 < 0)
{
x1 = 0;
}
if (x2 >= originalBitmapLock.Width)
{
x2 = originalBitmapLock.Width - 1;
}
int y1 = j - 1;
int y2 = j + 1;
if (y1 < 0)
{
y1 = 0;
}
if (y2 >= originalBitmapLock.Height)
{
y2 = originalBitmapLock.Height - 1;
}
int Depth = Bitmap.GetPixelFormatSize(original.PixelFormat);
int cCount = Depth / 8;
int i1 = ((j * original.Width) + x1) * cCount;
int i2 = ((j * original.Width) + i) * cCount;
int i3 = ((j * original.Width) + x2) * cCount;
int i4 = ((y1 * original.Width) + x1) * cCount;
int i5 = ((y1 * original.Width) + i) * cCount;
int i6 = ((y1 * original.Width) + x2) * cCount;
int i7 = ((y2 * original.Width) + x1) * cCount;
int i8 = ((y2 * original.Width) + i) * cCount;
int i9 = ((y2 * original.Width) + x2) * cCount;
if (Depth == 24)
{
tempB = originalBitmapLock.Pixels[i1] - 2 * originalBitmapLock.Pixels[i2] + originalBitmapLock.Pixels[i3]
- originalBitmapLock.Pixels[i4] - originalBitmapLock.Pixels[i5] - originalBitmapLock.Pixels[i6]
+ originalBitmapLock.Pixels[i7] + originalBitmapLock.Pixels[i8] + originalBitmapLock.Pixels[i9];
tempG = originalBitmapLock.Pixels[i1 + 1] - 2 * originalBitmapLock.Pixels[i2 + 1] + originalBitmapLock.Pixels[i3 + 1]
- originalBitmapLock.Pixels[i4 + 1] - originalBitmapLock.Pixels[i5 + 1] - originalBitmapLock.Pixels[i6 + 1]
+ originalBitmapLock.Pixels[i7 + 1] + originalBitmapLock.Pixels[i8 + 1] + originalBitmapLock.Pixels[i9 + 1];
tempR = originalBitmapLock.Pixels[i1 + 2] - 2 * originalBitmapLock.Pixels[i2 + 2] + originalBitmapLock.Pixels[i3 + 2]
- originalBitmapLock.Pixels[i4 + 2] - originalBitmapLock.Pixels[i5 + 2] - originalBitmapLock.Pixels[i6 + 2]
+ originalBitmapLock.Pixels[i7 + 2] + originalBitmapLock.Pixels[i8 + 2] + originalBitmapLock.Pixels[i9 + 2];
if (tempR > 255)
{
tempR = 255;
}
if (tempG > 255)
{
tempG = 255;
}
if (tempB > 255)
{
tempB = 255;
}
if (tempR < 0)
{
tempR = 0;
}
if (tempG < 0)
{
tempG = 0;
}
if (tempB < 0)
{
tempB = 0;
}
processedBitmapLock.SetPixel(i, j, Color.FromArgb(originalBitmapLock.GetPixel(i, j).A, tempR, tempG, tempB));
}
if (Depth == 8)
{
tempR = originalBitmapLock.Pixels[i1] - 2 * originalBitmapLock.Pixels[i2] + originalBitmapLock.Pixels[i3]
- originalBitmapLock.Pixels[i4] - originalBitmapLock.Pixels[i5] - originalBitmapLock.Pixels[i6]
+ originalBitmapLock.Pixels[i7] + originalBitmapLock.Pixels[i8] + originalBitmapLock.Pixels[i9];
if (tempR > 255)
{
tempR = 255;
}
if (tempR < 0)
{
tempR = 0;
}
processedBitmapLock.SetPixel(i, j, Color.FromArgb(originalBitmapLock.GetPixel(i, j).A, tempR, tempR, tempR));
}
// processedBitmapLock.SetPixel(i, j, Color.FromArgb(originalBitmapLock.GetPixel(i, j).A, tempR, tempG, tempB));
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}
public static Bitmap lineFilter(Bitmap original, int k)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
int maskSize = 3;
int midIndex;
if (maskSize % 2 == 0)
{
midIndex = (maskSize + 1) / 2;
}
else
{
midIndex = maskSize / 2;
}
int[][] mask = new int[4][]
{
new int[] { -1, -1, -1,
1, -2, 1,
1, 1, 1 },
new int[] { 1, 1, 1,
-1, -2, 1,
-1, -1, 1 },
new int[] { -1, 1, 1,
-1, -2, 1,
-1, 1, 1 },
new int[] { -1, -1, 1,
-1, -2, 1,
1, 1, 1 }
};
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
int tempR = 0;
int tempG = 0;
int tempB = 0;
int x, y;
int o = 0;
for (int n = -midIndex; n <= midIndex; n++)
{
y = j + n;
if (y < 0)
{
y = 0;
}
if (y >= originalBitmapLock.Height)
{
y = originalBitmapLock.Height - 1;
}
for (int m = -midIndex; m <= midIndex; m++)
{
x = i + m;
if (x < 0)
{
x = 0;
}
if (x >= originalBitmapLock.Width)
{
x = originalBitmapLock.Width - 1;
}
tempR += originalBitmapLock.GetPixel(x, y).R *mask[k][o];
tempG += originalBitmapLock.GetPixel(x, y).G *mask[k][o];
tempB += originalBitmapLock.GetPixel(x, y).B *mask[k][o];
o++;
}
}
if (tempR > 255)
{
tempR = 255;
}
if (tempG > 255)
{
tempG = 255;
}
if (tempB > 255)
{
tempB = 255;
}
if (tempR < 0)
{
tempR = 0;
}
if (tempG < 0)
{
tempG = 0;
}
if (tempB < 0)
{
tempB = 0;
}
processedBitmapLock.SetPixel(i, j, Color.FromArgb(originalBitmapLock.GetPixel(i, j).A, tempR, tempG, tempB));
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}
public static Bitmap ModifiHistogram(Bitmap original, int min, int max)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
int[][] H = Histogram(original);
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
int N = processedBmp.Height * processedBmp.Width;
if (H[0].SequenceEqual(H[1]) && H[0].SequenceEqual(H[2]))
{
int[] newH = new int[256];
for (int i = 0; i < 256; i++)
{
double temp = 0;
for (int j = 0; j <= i; j++)
{
temp += H[0][j];
}
newH[i] = (int)((min * Math.Pow(((max * 1.0) / min), (temp / N))));
}
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
Color color = Color.FromArgb(newH[originalBitmapLock.GetPixel(i, j).R], newH[originalBitmapLock.GetPixel(i, j).R], newH[originalBitmapLock.GetPixel(i, j).R]);
processedBitmapLock.SetPixel(i, j, color);
}
}
}
else
{
int[] newHR = new int[256];
int[] newHG = new int[256];
int[] newHB = new int[256];
for (int i = 0; i < 256; i++)
{
double[] temp = new double[3];
for (int j = 0; j <= i; j++)
{
temp[0] += H[0][j];
temp[1] += H[1][j];
temp[2] += H[2][j];
}
newHR[i] = (int)((min * Math.Pow(((max * 1.0) / min), (temp[0] / N))));
newHG[i] = (int)((min * Math.Pow(((max * 1.0) / min), (temp[1] / N))));
newHB[i] = (int)((min * Math.Pow(((max * 1.0) / min), (temp[2] / N))));
}
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
Color color = Color.FromArgb(newHR[originalBitmapLock.GetPixel(i, j).R], newHG[originalBitmapLock.GetPixel(i, j).G], newHB[originalBitmapLock.GetPixel(i, j).B]);
processedBitmapLock.SetPixel(i, j, color);
}
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}
public static Bitmap MedianFilter(Bitmap original, int MaskSize)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
int midIndex;
if (MaskSize % 2 == 0)
{
midIndex = (MaskSize + 1) / 2;
}
else
{
midIndex = MaskSize / 2;
}
for (int i = 0; i < original.Width; i++)
{
for (int j = 0; j < original.Height; j++)
{
int x, y;
List <int> R = new List <int>();
List <int> G = new List <int>();
List <int> B = new List <int>();
for (int n = -midIndex; n <= midIndex; n++)
{
x = i + n;
if (x < 0)
{
x = 0;
}
if (x >= originalBitmapLock.Width)
{
x = originalBitmapLock.Width - 1;
}
for (int m = -midIndex; m <= midIndex; m++)
{
y = j + m;
if (y < 0)
{
y = 0;
}
if (y >= originalBitmapLock.Height)
{
y = originalBitmapLock.Height - 1;
}
R.Add(originalBitmapLock.GetPixel(x, y).R);
G.Add(originalBitmapLock.GetPixel(x, y).G);
B.Add(originalBitmapLock.GetPixel(x, y).B);
}
}
int midleListIndex = (MaskSize * MaskSize) / 2;
R.Sort();
G.Sort();
B.Sort();
processedBitmapLock.SetPixel(i, j, Color.FromArgb(originalBitmapLock.GetPixel(i, j).A, R[midleListIndex], G[midleListIndex], B[midleListIndex]));
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}
public static Bitmap AritmeticMiddleFilter(Bitmap original, int maskSize)
{
Bitmap processedBmp = new Bitmap(original.Width, original.Height);
LockBitmap originalBitmapLock = new LockBitmap(original);
LockBitmap processedBitmapLock = new LockBitmap(processedBmp);
originalBitmapLock.LockBits(ImageLockMode.ReadOnly);
processedBitmapLock.LockBits(ImageLockMode.WriteOnly);
int midIndex;
if (maskSize % 2 == 0)
{
midIndex = (maskSize + 1) / 2;
}
else
{
midIndex = maskSize / 2;
}
for (int i = 0; i < originalBitmapLock.Width; i++)
{
for (int j = 0; j < originalBitmapLock.Height; j++)
{
int tempR = 0;
int tempG = 0;
int tempB = 0;
int x, y;
int o = 0;
for (int n = -midIndex; n <= midIndex; n++)
{
x = i + n;
if (x < 0)
{
x = 0;
}
if (x >= originalBitmapLock.Width)
{
x = originalBitmapLock.Width - 1;
}
for (int m = -midIndex; m <= midIndex; m++)
{
y = j + m;
if (y < 0)
{
y = 0;
}
if (y >= originalBitmapLock.Height)
{
y = originalBitmapLock.Height - 1;
}
tempR += originalBitmapLock.GetPixel(x, y).R;
tempG += originalBitmapLock.GetPixel(x, y).G;
tempB += originalBitmapLock.GetPixel(x, y).B;
o++;
}
}
tempR /= o;
tempG /= o;
tempB /= o;
if (tempR > 255)
{
tempR = 255;
}
if (tempG > 255)
{
tempG = 255;
}
if (tempB > 255)
{
tempB = 255;
}
processedBitmapLock.SetPixel(i, j, Color.FromArgb(originalBitmapLock.GetPixel(i, j).A, tempR, tempG, tempB));
}
}
originalBitmapLock.UnlockBits();
processedBitmapLock.UnlockBits();
return(processedBmp);
}