// Выделение связных областей рекурсивным алгоритмом
unsafe private void AllocationOfConnectedDomains_recursively()
{
int maxStackSize = 100000000;
Bitmap tmp = bitmap.Clone(new Rectangle(0, 0, bitmap.Width, bitmap.Height), bitmap.PixelFormat);
Thread t = new Thread(() =>
{
UnsafeBitmap src = new UnsafeBitmap(tmp);
Byte* pBaseSrc = src.LockBitmap();
int L = 1;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
FillLabels(pBaseSrc, x, y, L++);
}
}
src.UnlockBitmap();
}, maxStackSize);
t.Start();
t.Join();
objectsCount = RenumberDomains();
}
// Выделение связных областей рекурсивным алгоритмом
unsafe private void AllocationOfConnectedDomains_recursively()
{
int maxStackSize = 100000000;
Bitmap tmp = bitmap.Clone(new Rectangle(0, 0, bitmap.Width, bitmap.Height), bitmap.PixelFormat);
Thread t = new Thread(() =>
{
UnsafeBitmap src = new UnsafeBitmap(tmp);
Byte *pBaseSrc = src.LockBitmap();
int L = 1;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
FillLabels(pBaseSrc, x, y, L++);
}
}
src.UnlockBitmap();
}, maxStackSize);
t.Start();
t.Join();
objectsCount = RenumberDomains();
}
unsafe public Bitmap GetClusteredBitmap()
{
AllocationOfConnectedDomains_recursively();
CalculateParameters();
Bitmap bitmapRes = new Bitmap(bitmap.Width, bitmap.Height, bitmap.PixelFormat);
if (GetGoodObjectsCount() == 0)
{
return(bitmapRes);
}
Hashtable table = k_means();
Random random = new Random();
Color[] colors = new Color[table.Count];
for (int i = 0; i < table.Count; i++)
{
colors[i] = Color.FromArgb(random.Next(50, 255), random.Next(50, 255),
random.Next(50, 255));
}
UnsafeBitmap src = new UnsafeBitmap(bitmap);
UnsafeBitmap res = new UnsafeBitmap(bitmapRes);
Byte * pBaseRes = res.LockBitmap();
Byte * pBaseSrc = src.LockBitmap();
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int labelIndex = GetLabelIndex(x, y);
if (labels[labelIndex] != 0)
{
for (int i = 0; i < table.Count; i++)
{
if (((List <int>)table[i]).Contains(labels[labelIndex]))
{
int imageIndex = (y * byteWidth) + x * byteDepth;
pBaseRes[imageIndex] = colors[i].R;
pBaseRes[imageIndex + 1] = colors[i].G;
pBaseRes[imageIndex + 2] = colors[i].B;
if (byteDepth == 4)
{
pBaseRes[imageIndex + 3] = pBaseSrc[imageIndex + 3];
}
break;
}
}
}
}
}
res.UnlockBitmap();
src.UnlockBitmap();
return(bitmapRes);
}
unsafe public Bitmap GetClusteredBitmap()
{
AllocationOfConnectedDomains_recursively();
CalculateParameters();
Bitmap bitmapRes = new Bitmap(bitmap.Width, bitmap.Height, bitmap.PixelFormat);
if (GetGoodObjectsCount() == 0)
return bitmapRes;
Hashtable table = k_means();
Random random = new Random();
Color[] colors = new Color[table.Count];
for (int i = 0; i < table.Count; i++)
{
colors[i] = Color.FromArgb(random.Next(50, 255), random.Next(50, 255),
random.Next(50, 255));
}
UnsafeBitmap src = new UnsafeBitmap(bitmap);
UnsafeBitmap res = new UnsafeBitmap(bitmapRes);
Byte* pBaseRes = res.LockBitmap();
Byte* pBaseSrc = src.LockBitmap();
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int labelIndex = GetLabelIndex(x, y);
if (labels[labelIndex] != 0)
{
for (int i = 0; i < table.Count; i++)
{
if (((List<int>)table[i]).Contains(labels[labelIndex]))
{
int imageIndex = (y * byteWidth) + x * byteDepth;
pBaseRes[imageIndex] = colors[i].R;
pBaseRes[imageIndex + 1] = colors[i].G;
pBaseRes[imageIndex + 2] = colors[i].B;
if(byteDepth == 4)
pBaseRes[imageIndex + 3] = pBaseSrc[imageIndex + 3];
break;
}
}
}
}
}
res.UnlockBitmap();
src.UnlockBitmap();
return bitmapRes;
}
// Пропорциональная маска без перекрытия - бинарное изображение одинаково во всех каналах
unsafe public static Bitmap ApplyMask_grayscale(Bitmap bitmapSrc, double[,] mask)
{
Bitmap bitmapRes = new Bitmap(bitmapSrc.Width, bitmapSrc.Height, bitmapSrc.PixelFormat);
int depth = Bitmap.GetPixelFormatSize(bitmapSrc.PixelFormat);
Byte* pBaseSrc, pBaseRes;
UnsafeBitmap src_wrap = new UnsafeBitmap(bitmapSrc);
UnsafeBitmap res_wrap = new UnsafeBitmap(bitmapRes);
pBaseSrc = src_wrap.LockBitmap();
pBaseRes = res_wrap.LockBitmap();
int width = bitmapSrc.Width;
int height = bitmapSrc.Height;
int maskWidth = mask.GetLength(0);
int maskHeight = mask.GetLength(1);
double maxValue = mask.Cast<double>().Max();
int pos;
if (depth == 24)
{
for (int x = 0; x < width; x += maskWidth)
{
for (int y = 0; y < height; y += maskHeight)
{
double mul = 255 / maxValue;
for (int i = 0; i < maskWidth; i++)
{
for (int j = 0; j < maskHeight; j++)
{
int pixelPosX = x + i;
int pixelPosY = y + j;
if (pixelPosX >= width) pixelPosX -= width;
if (pixelPosY >= height) pixelPosY -= height;
pos = 3 * (width * pixelPosY + pixelPosX);
double value = 0.3 * pBaseSrc[pos + 0] + 0.59 * pBaseSrc[pos + 1] + 0.11 * pBaseSrc[pos + 2];
if (value < mul * mask[j, i])
{
pBaseRes[pos + 0] = 0;
pBaseRes[pos + 1] = 0;
pBaseRes[pos + 2] = 0;
}
else
{
pBaseRes[pos + 0] = 255;
pBaseRes[pos + 1] = 255;
pBaseRes[pos + 2] = 255;
}
}
}
}
}
}
else if (depth == 32)
{
for (int x = 0; x < width; x += maskWidth)
{
for (int y = 0; y < height; y += maskHeight)
{
double mul = 255 / maxValue;
for (int i = 0; i < maskWidth; i++)
{
for (int j = 0; j < maskHeight; j++)
{
int pixelPosX = x + i;
int pixelPosY = y + j;
if (pixelPosX >= width) pixelPosX -= width;
if (pixelPosY >= height) pixelPosY -= height;
pos = 4 * (width * pixelPosY + pixelPosX);
double value = 0.3 * pBaseSrc[pos + 0] + 0.59 * pBaseSrc[pos + 1] + 0.11 * pBaseSrc[pos + 2];
if (value < mul * mask[j, i])
{
pBaseRes[pos + 0] = 0;
pBaseRes[pos + 1] = 0;
pBaseRes[pos + 2] = 0;
}
else
{
pBaseRes[pos + 0] = 255;
pBaseRes[pos + 1] = 255;
pBaseRes[pos + 2] = 255;
}
pBaseRes[pos + 3] = pBaseSrc[pos + 3];
}
}
}
}
}
res_wrap.UnlockBitmap();
src_wrap.UnlockBitmap();
return bitmapRes;
}
// Свёртка с ядром без масштабирования (<0 = 0, >255 = 255)
unsafe public static Bitmap ApplyKernel(Bitmap bitmapSrc, double[,] kernel)
{
Bitmap bitmapRes = new Bitmap(bitmapSrc.Width, bitmapSrc.Height, bitmapSrc.PixelFormat);
int depth = Bitmap.GetPixelFormatSize(bitmapSrc.PixelFormat);
Byte* pBaseSrc, pBaseRes;
UnsafeBitmap src_wrap = new UnsafeBitmap(bitmapSrc);
UnsafeBitmap res_wrap = new UnsafeBitmap(bitmapRes);
pBaseSrc = src_wrap.LockBitmap();
pBaseRes = res_wrap.LockBitmap();
int width = bitmapSrc.Width;
int height = bitmapSrc.Height;
int kernelWidth = kernel.GetLength(0);
int kernelHeight = kernel.GetLength(1);
int pos;
//Производим вычисления
if (depth == 24)
{
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
double rSum = 0, gSum = 0, bSum = 0;
for (int i = 0; i < kernelWidth; i++)
{
for (int j = 0; j < kernelHeight; j++)
{
int pixelPosX = x + (i - (kernelWidth / 2));
int pixelPosY = y + (j - (kernelHeight / 2));
if (pixelPosX == width) pixelPosX = 0;
if (pixelPosX == -1) pixelPosX = width - 1;
if (pixelPosY == height) pixelPosY = 0;
if (pixelPosY == -1) pixelPosY = height - 1;
pos = 3 * (width * pixelPosY + pixelPosX);
byte r = pBaseSrc[pos + 0];
byte g = pBaseSrc[pos + 1];
byte b = pBaseSrc[pos + 2];
double kernelVal = kernel[i, j];
rSum += r * kernelVal;
gSum += g * kernelVal;
bSum += b * kernelVal;
}
}
if (rSum < 0) rSum = 0;
if (rSum > 255) rSum = 255;
if (gSum < 0) gSum = 0;
if (gSum > 255) gSum = 255;
if (bSum < 0) bSum = 0;
if (bSum > 255) bSum = 255;
//Записываем значения в результирующее изображение
pos = 3 * (width * y + x);
pBaseRes[pos + 0] = (byte)rSum;
pBaseRes[pos + 1] = (byte)gSum;
pBaseRes[pos + 2] = (byte)bSum;
}
}
}
else if (depth == 32)
{
for (int x = 0; x < width; x++)
{
for (int y = 0; y < height; y++)
{
double rSum = 0, gSum = 0, bSum = 0;
for (int i = 0; i < kernelWidth; i++)
{
for (int j = 0; j < kernelHeight; j++)
{
int pixelPosX = x + (i - (kernelWidth / 2));
int pixelPosY = y + (j - (kernelHeight / 2));
if (pixelPosX == width) pixelPosX = 0;
if (pixelPosX == -1) pixelPosX = width - 1;
if (pixelPosY == height) pixelPosY = 0;
if (pixelPosY == -1) pixelPosY = height - 1;
pos = 4 * (width * pixelPosY + pixelPosX);
byte r = pBaseSrc[pos + 0];
byte g = pBaseSrc[pos + 1];
byte b = pBaseSrc[pos + 2];
double kernelVal = kernel[i, j];
rSum += r * kernelVal;
gSum += g * kernelVal;
bSum += b * kernelVal;
}
}
if (rSum < 0) rSum = 0;
if (rSum > 255) rSum = 255;
if (gSum < 0) gSum = 0;
if (gSum > 255) gSum = 255;
if (bSum < 0) bSum = 0;
if (bSum > 255) bSum = 255;
//Записываем значения в результирующее изображение
pos = 4 * (width * y + x);
pBaseRes[pos + 0] = (byte)rSum;
pBaseRes[pos + 1] = (byte)gSum;
pBaseRes[pos + 2] = (byte)bSum;
pBaseRes[pos + 3] = pBaseSrc[pos + 3];
}
}
}
res_wrap.UnlockBitmap();
src_wrap.UnlockBitmap();
//Возвращаем отфильтрованное изображение
return bitmapRes;
}
// Свёртка с ядром с независимым масштабированием каналов R, G, B
unsafe static public Bitmap ApplyKernelWithIndependentScaling(Bitmap bitmapSrc, double[,] kernel)
{
Bitmap bitmapRes = new Bitmap(bitmapSrc.Width, bitmapSrc.Height, bitmapSrc.PixelFormat);
int depth = Bitmap.GetPixelFormatSize(bitmapSrc.PixelFormat);
Byte* pBaseSrc, pBaseRes;
UnsafeBitmap src_wrap = new UnsafeBitmap(bitmapSrc);
UnsafeBitmap res_wrap = new UnsafeBitmap(bitmapRes);
pBaseSrc = src_wrap.LockBitmap();
pBaseRes = res_wrap.LockBitmap();
int width = bitmapSrc.Width;
int height = bitmapSrc.Height;
Int16[] array = new Int16[width * height * depth / 3];
int strNum = kernel.GetLength(0);
int colNum = kernel.GetLength(1);
int pos, pixelPosX, pixelPosY;
Int16 maxR = (Int16)pBaseSrc[0], maxG = (Int16)pBaseSrc[1], maxB = (Int16)pBaseSrc[2];
Int16 minR = (Int16)pBaseSrc[0], minG = (Int16)pBaseSrc[1], minB = (Int16)pBaseSrc[2];
if (depth == 32)
{
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
double rSum = 0, gSum = 0, bSum = 0;
for (int i = 0; i < strNum; i++)
{
for (int j = 0; j < colNum; j++)
{
pixelPosX = x + (i - (strNum / 2));
pixelPosY = y + (j - (colNum / 2));
if (pixelPosX == width) pixelPosX = 0;
if (pixelPosX == -1) pixelPosX = width - 1;
if (pixelPosY == height) pixelPosY = 0;
if (pixelPosY == -1) pixelPosY = height - 1;
pos = ((pixelPosY * width) + pixelPosX) * 4;
rSum += pBaseSrc[pos] * kernel[i, j];
gSum += pBaseSrc[pos + 1] * kernel[i, j];
bSum += pBaseSrc[pos + 2] * kernel[i, j];
}
}
pos = ((y * width) + x) * 4;
array[pos] = (Int16)rSum;
array[pos + 1] = (Int16)gSum;
array[pos + 2] = (Int16)bSum;
if (array[pos] > maxR) maxR = array[pos];
if (array[pos + 1] > maxG) maxG = array[pos + 1];
if (array[pos + 2] > maxB) maxB = array[pos + 2];
if (array[pos] < minR) minR = array[pos];
if (array[pos + 1] < minG) minG = array[pos + 1];
if (array[pos + 2] < minB) minB = array[pos + 2];
}
}
Int16 deltaR = (Int16)(maxR - minR), deltaG = (Int16)(maxG - minG), deltaB = (Int16)(maxB - minB);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
pos = ((y * width) + x) * 4;
Int16 r = array[pos];
Int16 g = array[pos + 1];
Int16 b = array[pos + 2];
pBaseRes[pos] = (byte)((r - minR) * 255 / deltaR);
pBaseRes[pos + 1] = (byte)((g - minG) * 255 / deltaG);
pBaseRes[pos + 2] = (byte)((b - minB) * 255 / deltaB);
pBaseRes[pos + 3] = pBaseSrc[pos + 3];
}
}
}
else if (depth == 24)
{
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
double rSum = 0, gSum = 0, bSum = 0;
for (int i = 0; i < strNum; i++)
{
for (int j = 0; j < colNum; j++)
{
pixelPosX = x + (i - (strNum / 2));
pixelPosY = y + (j - (colNum / 2));
if (pixelPosX == width) pixelPosX = 0;
if (pixelPosX == -1) pixelPosX = width - 1;
if (pixelPosY == height) pixelPosY = 0;
if (pixelPosY == -1) pixelPosY = height - 1;
pos = ((pixelPosY * width) + pixelPosX) * 3;
rSum += pBaseSrc[pos] * kernel[i, j];
gSum += pBaseSrc[pos + 1] * kernel[i, j];
bSum += pBaseSrc[pos + 2] * kernel[i, j];
}
}
pos = ((y * width) + x) * 3;
array[pos] = (Int16)rSum;
array[pos + 1] = (Int16)gSum;
array[pos + 2] = (Int16)bSum;
if (array[pos] > maxR)
maxR = array[pos];
if (array[pos + 1] > maxG) maxG = array[pos + 1];
if (array[pos + 2] > maxB) maxB = array[pos + 2];
if (array[pos] < minR) minR = array[pos];
if (array[pos + 1] < minG) minG = array[pos + 1];
if (array[pos + 2] < minB) minB = array[pos + 2];
}
}
Int16 deltaR = (Int16)(maxR - minR), deltaG = (Int16)(maxG - minG), deltaB = (Int16)(maxB - minB);
if (deltaR == 0) deltaR = 1;
if (deltaG == 0) deltaG = 1;
if (deltaB == 0) deltaB = 1;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
pos = ((y * width) + x) * 3;
Int16 r = array[pos];
Int16 g = array[pos + 1];
Int16 b = array[pos + 2];
pBaseRes[pos] = (byte)((r - minR) * 255 / deltaR);
pBaseRes[pos + 1] = (byte)((g - minG) * 255 / deltaG);
pBaseRes[pos + 2] = (byte)((b - minB) * 255 / deltaB);
}
}
}
src_wrap.UnlockBitmap();
res_wrap.UnlockBitmap();
return bitmapRes;
}
// Соляризация
unsafe static public Bitmap Solarisation(Bitmap BitmapSrc, bool dynamicMatch, double k)
{
Bitmap BitmapRes = new Bitmap(BitmapSrc.Width, BitmapSrc.Height, BitmapSrc.PixelFormat);
int depth = Bitmap.GetPixelFormatSize(BitmapSrc.PixelFormat);
Byte* pBaseSrc, pBaseRes;
UnsafeBitmap src = new UnsafeBitmap(BitmapSrc);
UnsafeBitmap res = new UnsafeBitmap(BitmapRes);
pBaseSrc = src.LockBitmap();
pBaseRes = res.LockBitmap();
int width = BitmapSrc.Width;
int height = BitmapSrc.Height;
byte R_max = 0, G_max = 0, B_max = 0;
byte r, g, b, a;
double R_k, G_k, B_k;
int i;
if (depth == 32)
{
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
i = ((y * width) + x) * 4;
r = pBaseSrc[i];
g = pBaseSrc[i + 1];
b = pBaseSrc[i + 2];
if (R_max < r) R_max = r;
if (G_max < r) G_max = g;
if (B_max < r) B_max = b;
if (R_max == 255 && G_max == 255 && B_max == 255)
goto loop_End;
}
}
loop_End:
if (dynamicMatch == true)
{
R_k = 4.0 / R_max;
G_k = 4.0 / G_max;
B_k = 4.0 / B_max;
}
else
{
R_k = k;
G_k = k;
B_k = k;
}
double R, G, B;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
i = ((y * width) + x) * 4;
r = pBaseSrc[i];
g = pBaseSrc[i + 1];
b = pBaseSrc[i + 2];
a = pBaseSrc[i + 3];
R = R_k * r * (R_max - r);
G = G_k * g * (G_max - g);
B = B_k * b * (B_max - b);
if (R < 0) R = 0;
else if (R > 255) R = 255;
if (G < 0) G = 0;
else if (G > 255) G = 255;
if (B < 0) B = 0;
else if (B > 255) B = 255;
pBaseRes[i] = (byte)R;
pBaseRes[i + 1] = (byte)G;
pBaseRes[i + 2] = (byte)B;
pBaseRes[i + 3] = a;
}
}
}
else if (depth == 24)
{
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
i = ((y * width) + x) * 3;
r = pBaseSrc[i];
g = pBaseSrc[i + 1];
b = pBaseSrc[i + 2];
if (R_max < r) R_max = r;
if (G_max < r) G_max = g;
if (B_max < r) B_max = b;
if (R_max == 255 && G_max == 255 && B_max == 255)
goto loop_End;
}
}
loop_End:
if (dynamicMatch == true)
{
R_k = 4.0 / R_max;
G_k = 4.0 / G_max;
B_k = 4.0 / B_max;
}
else
{
R_k = k;
G_k = k;
B_k = k;
}
double R, G, B;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
i = ((y * width) + x) * 3;
r = pBaseSrc[i];
g = pBaseSrc[i + 1];
b = pBaseSrc[i + 2];
R = R_k * r * (R_max - r);
G = G_k * g * (G_max - g);
B = B_k * b * (B_max - b);
if (R < 0) R = 0;
else if (R > 255) R = 255;
if (G < 0) G = 0;
else if (G > 255) G = 255;
if (B < 0) B = 0;
else if (B > 255) B = 255;
pBaseRes[i] = (byte)R;
pBaseRes[i + 1] = (byte)G;
pBaseRes[i + 2] = (byte)B;
}
}
}
src.UnlockBitmap();
res.UnlockBitmap();
return BitmapRes;
}
//----------------------------------------------------------------------------------------------
// Медианный фильтр
unsafe public static Bitmap MedianFilter_unsafe(Bitmap bitmapSrc, int kernelSize)
{
if (bitmapSrc.PixelFormat != PixelFormat.Format24bppRgb && bitmapSrc.PixelFormat != PixelFormat.Format32bppArgb
&& bitmapSrc.PixelFormat != PixelFormat.Format32bppRgb && bitmapSrc.PixelFormat != PixelFormat.Canonical)
throw new Exception("Unsupported color depth. Support only 24bppRgb, 32bppArgb and 32bppRgb");
if(kernelSize < 3 || kernelSize % 2 == 0)
throw new Exception("Size of kernel of Median filter should be greater than or equal to 3 and odd.");
Bitmap bitmapRes = new Bitmap(bitmapSrc.Width, bitmapSrc.Height, bitmapSrc.PixelFormat);
int depth = Bitmap.GetPixelFormatSize(bitmapSrc.PixelFormat);
int byteDepth = depth / 8;
Byte* pBaseSrc, pBaseRes;
UnsafeBitmap src = new UnsafeBitmap(bitmapSrc);
UnsafeBitmap res = new UnsafeBitmap(bitmapRes);
pBaseSrc = src.LockBitmap();
pBaseRes = res.LockBitmap();
int width = bitmapSrc.Width;
int byteWidth = bitmapSrc.Width * byteDepth;
if (byteWidth % 4 != 0)
byteWidth = 4 * (byteWidth / 4 + 1);
int height = bitmapSrc.Height;
int strNum = kernelSize;
int colNum = kernelSize;
int pixelPosX, pixelPosY, pos;
int indent = kernelSize / 2;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
if (y >= indent && y < height - indent && x >= indent && x < width - indent)
{
byte[] arrayR = new byte[colNum * strNum];
byte[] arrayG = new byte[colNum * strNum];
byte[] arrayB = new byte[colNum * strNum];
int arrIndex = 0;
for (int i = 0; i < strNum; i++)
{
for (int j = 0; j < colNum; j++)
{
pixelPosX = x + (i - (strNum / 2));
pixelPosY = y + (j - (colNum / 2));
pos = (pixelPosY * byteWidth) + pixelPosX * byteDepth;
arrayR[arrIndex] = pBaseSrc[pos];
arrayG[arrIndex] = pBaseSrc[pos + 1];
arrayB[arrIndex] = pBaseSrc[pos + 2];
arrIndex++;
}
}
Array.Sort(arrayR);
Array.Sort(arrayG);
Array.Sort(arrayB);
pos = (y * byteWidth) + x * byteDepth;
pBaseRes[pos] = arrayR[arrayR.Length / 2];
pBaseRes[pos + 1] = arrayG[arrayG.Length / 2];
pBaseRes[pos + 2] = arrayB[arrayB.Length / 2];
}
else
{
pos = (y * byteWidth) + x * byteDepth;
pBaseRes[pos] = pBaseSrc[pos];
pBaseRes[pos + 1] = pBaseSrc[pos + 1];
pBaseRes[pos + 2] = pBaseSrc[pos + 2];
}
if (byteDepth == 4)
pBaseRes[pos + 3] = pBaseSrc[pos + 3];
}
}
src.UnlockBitmap();
res.UnlockBitmap();
return bitmapRes;
}
//----------------------------------------------------------------------------------------------
// Перевод в оттенки серого и пороговая бинаризация
unsafe public static Bitmap GrayscaleAndBinarization_unsafe(Bitmap bitmapSrc, byte threshold)
{
if (bitmapSrc.PixelFormat != PixelFormat.Format24bppRgb && bitmapSrc.PixelFormat != PixelFormat.Format32bppArgb
&& bitmapSrc.PixelFormat != PixelFormat.Format32bppRgb && bitmapSrc.PixelFormat != PixelFormat.Canonical)
throw new Exception("Unsupported color depth. Support only 24bppRgb, 32bppArgb and 32bppRgb");
Bitmap bitmapRes = new Bitmap(bitmapSrc.Width, bitmapSrc.Height, bitmapSrc.PixelFormat);
int depth = Bitmap.GetPixelFormatSize(bitmapSrc.PixelFormat);
int byteDepth = depth / 8;
Byte* pBaseSrc, pBaseRes;
UnsafeBitmap src = new UnsafeBitmap(bitmapSrc);
UnsafeBitmap res = new UnsafeBitmap(bitmapRes);
pBaseSrc = src.LockBitmap();
pBaseRes = res.LockBitmap();
int width = bitmapSrc.Width;
int byteWidth = bitmapSrc.Width * byteDepth;
if (byteWidth % 4 != 0)
byteWidth = 4 * (byteWidth / 4 + 1);
int height = bitmapSrc.Height;
int i;
double value;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
i = (y * byteWidth) + x * byteDepth;
value = 0.3 * pBaseSrc[i + 0] + 0.59 * pBaseSrc[i + 1] + 0.11 * pBaseSrc[i + 2];
if (value >= (double)threshold)
{
pBaseRes[i] = 255;
pBaseRes[i + 1] = 255;
pBaseRes[i + 2] = 255;
}
else
{
pBaseRes[i] = 0;
pBaseRes[i + 1] = 0;
pBaseRes[i + 2] = 0;
}
if (byteDepth == 4)
pBaseRes[i + 3] = pBaseSrc[i + 3];
}
}
src.UnlockBitmap();
res.UnlockBitmap();
return bitmapRes;
}
