// получение негатива изображения
public int Negativ(int index)
{
int i, j;
if (index < 0 || index > PixelMapList.Count || PixelMapList.Count == 0)
{
return(-1);
}
int height = 0;
int width = 0;
Bitmap img = CreateNewMapForMap(index, ref height, ref width);
for (i = 0; i < img.Width; i++)
{
for (j = 0; j < img.Height; j++)
{
int r = 0, g = 0, b = 0;
GetRGB(img, i, j, ref r, ref g, ref b);
r = 255 - r;
g = 255 - g;
b = 255 - b;
img.SetPixel(i, j, Color.FromArgb(r, g, b));
}
}
PixelMapList.Add(img);
return(0);
}
// функция контрастирования изображения
public int Contrast(int indexmap, int n)
{
int i, j;
if (indexmap < 0 || indexmap > PixelMapList.Count || PixelMapList.Count == 0)
{
return(-1);
}
int height = 0;
int width = 0;
Bitmap newmap = CreateNewMapForMap(indexmap, ref height, ref width);
if (newmap == null)
{
return(-1);
}
for (i = 0; i < width; i++)
{
for (j = 0; j < height; j++)
{
int r = 0, g = 0, b = 0;
GetRGB(newmap, i, j, ref r, ref g, ref b);
r = ContrastPixel(r, n);
g = ContrastPixel(g, n);
b = ContrastPixel(b, n);
newmap.SetPixel(i, j, Color.FromArgb(r, g, b));
}
}
PixelMapList.Add(newmap);
return(0);
}
// обработка краев изображения
public int BorderProcessing(int index)
{
int j;
if (index < 0 || index > PixelMapList.Count || PixelMapList.Count == 0)
{
return(-1);
}
int height = 0;
int width = 0;
Bitmap newmap = CreateNewMapForMap(index, ref height, ref width);
if (newmap == null)
{
return(-1);
}
for (j = 0; j < height; j++)
{
BorderProcessingHelper(newmap, height, width, 0, j);
BorderProcessingHelper(newmap, height, width, 1, j);
BorderProcessingHelper(newmap, height, width, width - 2, j);
BorderProcessingHelper(newmap, height, width, width - 1, j);
}
for (j = 0; j < width; j++)
{
BorderProcessingHelper(newmap, height, width, j, 0);
BorderProcessingHelper(newmap, height, width, j, 1);
BorderProcessingHelper(newmap, height, width, j, height - 2);
BorderProcessingHelper(newmap, height, width, j, height - 1);
}
PixelMapList.Add(newmap);
return(0);
}
public int Brightness(int indexmap, int n)
{
int i, j;
if (indexmap < 0 || indexmap > PixelMapList.Count || PixelMapList.Count == 0)
{
return(-1);
}
int height = 0;
int width = 0;
Bitmap newmap = CreateNewMapForMap(indexmap, ref height, ref width);
if (newmap == null)
{
return(-1);
}
for (i = 0; i < width; i++)
{
for (j = 0; j < height; j++)
{
int r = 0, g = 0, b = 0;
GetRGB(newmap, i, j, ref r, ref g, ref b);
r = r + n;
g = g + n;
b = b + n;
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;
}
newmap.SetPixel(i, j, Color.FromArgb(r, g, b));
}
}
PixelMapList.Add(newmap);
return(0);
}
// Метод Оцу
public int MethodOtsu(int index)
{
if (index < 0 || index > PixelMapList.Count || PixelMapList.Count == 0)
{
return(-1);
}
int height = 0;
int width = 0;
Bitmap newmap = CreateNewMapForMap(index, ref height, ref width);
if (newmap == null)
{
return(-1);
}
int[] p = new int[256]; // ?
double[] pp = new double[256]; //?
int total = 0;
int r = 0, g = 0, b = 0, res = 0;
for (int I = 0; I < p.Length; I++)
{
p[I] = 0;
}
for (int I = 0; I < newmap.Width; I++)
{
for (int J = 0; J < newmap.Height; J++)
{
GetRGB(newmap, I, J, ref r, ref g, ref b);
res = Convert.ToInt32(RedApproximation * r + GreenApproximation * g + BlueApproximation * b);
p[res]++;
}
}
for (int I = 0; I < 256; I++)
{
total += p[I];
}
for (int I = 0; I < 256; I++)
{
pp[I] = Convert.ToDouble(p[I]) / Convert.ToDouble(total);
}
int t = 0;
double q1, q2, m1, m2, s1, s2, sw = Double.MaxValue; //?
for (int I = 0; I < 256; I++)
{
q1 = q2 = 0;
m1 = m2 = 0;
s1 = s2 = 0;
for (int J = 0; J <= I; J++)
{
q1 += pp[J];
}
for (int J = I + 1; J < 256; J++)
{
q2 += pp[J];
}
for (int J = 0; J <= I; J++)
{
m1 += J * pp[J] / q1;
}
for (int J = I + 1; J < 256; J++)
{
m2 += J * pp[J] / q2;
}
for (int J = 0; J <= I; J++)
{
s1 += Math.Pow((J - m1), 2) * pp[J] / q1;
}
for (int J = I + 1; J < 256; J++)
{
s2 += Math.Pow((J - m2), 2) * pp[J] / q2;
}
if ((q1 * s1 + q2 * s2) < sw)
{
sw = q1 * s1 + q2 * s2;
t = I;
}
}
for (int I = 0; I < newmap.Width; I++)
{
for (int J = 0; J < newmap.Height; J++)
{
GetRGB(newmap, I, J, ref r, ref g, ref b);
res = Convert.ToInt32(RedApproximation * r + GreenApproximation * g + BlueApproximation * b);
if (res > t)
{
newmap.SetPixel(I, J, Color.FromArgb(0, 0, 0));
}
else
{
newmap.SetPixel(I, J, Color.FromArgb(255, 255, 255));
}
}
}
PixelMapList.Add(newmap);
return(0);
}