private static Dictionary <string, Point> GetBlock(Bitmap bm, int x, int y)
{
Dictionary <string, Point> dictionary = new Dictionary <string, Point>();
Stack <Point> stack = new Stack <Point>();
Color pixel = bm.GetPixel(x, y);
bool flag = ImageHelper.ArgbEqual(pixel, Color.White);
Dictionary <string, Point> result;
if (flag)
{
result = dictionary;
}
else
{
stack.Push(new Point(x, y));
while (stack.Count != 0)
{
Point point = stack.Pop();
string key = point.X + "#" + point.Y;
dictionary[key] = new Point(point.X, point.Y);
List <Point> list = new List <Point>();
Point item = new Point(point.X + 1, point.Y);
bool flag2 = item.X < bm.Width;
if (flag2)
{
Color pixel2 = bm.GetPixel(item.X, item.Y);
bool flag3 = ImageHelper.ArgbEqual(pixel2, Color.Black);
if (flag3)
{
list.Add(item);
}
}
item = new Point(point.X - 1, point.Y);
bool flag4 = item.X >= 0;
if (flag4)
{
Color pixel3 = bm.GetPixel(item.X, item.Y);
bool flag5 = ImageHelper.ArgbEqual(pixel3, Color.Black);
if (flag5)
{
list.Add(item);
}
}
item = new Point(point.X, point.Y + 1);
bool flag6 = item.Y < bm.Height;
if (flag6)
{
Color pixel4 = bm.GetPixel(item.X, item.Y);
bool flag7 = ImageHelper.ArgbEqual(pixel4, Color.Black);
if (flag7)
{
list.Add(item);
}
}
item = new Point(point.X, point.Y - 1);
bool flag8 = item.Y >= 0;
if (flag8)
{
Color pixel5 = bm.GetPixel(item.X, item.Y);
bool flag9 = ImageHelper.ArgbEqual(pixel5, Color.Black);
if (flag9)
{
list.Add(item);
}
}
for (int i = 0; i < list.Count; i++)
{
Point item2 = list[i];
key = item2.X + "#" + item2.Y;
bool flag10 = !dictionary.ContainsKey(key);
if (flag10)
{
stack.Push(item2);
}
}
}
result = dictionary;
}
return(result);
}
public static Bitmap Rotate(this Image im, int angle)
{
return(ImageHelper.Rotate(new Bitmap(im), angle));
}
public static Bitmap RemoveBlackEdge(this Image img)
{
Bitmap bitmap = new Bitmap(img);
Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
BitmapData bitmapData = bitmap.LockBits(rect, ImageLockMode.ReadWrite, bitmap.PixelFormat);
int width = bitmapData.Width;
int height = bitmapData.Height;
int stride = bitmapData.Stride;
double picByteSize = ImageHelper.GetPicByteSize(bitmap.PixelFormat);
int num = (int)Math.Ceiling(picByteSize * (double)width);
int num2 = stride - num;
IntPtr scan = bitmapData.Scan0;
int num3 = stride * height;
int num4 = 0;
ImageHelper.rgbValues = new byte[num3];
Marshal.Copy(scan, ImageHelper.rgbValues, 0, num3);
int num5 = (int)((double)num * 0.02);
int num6 = (int)((double)height * 0.02);
int num7 = (int)picByteSize;
for (int i = 0; i < height; i++)
{
int j;
for (j = 0; j < num; j += 4)
{
bool flag = true;
bool flag2 = ImageHelper.rgbValues[num4] <= 20;
if (flag2)
{
for (int k = 0; k < 4; k++)
{
bool flag3 = num4 + k >= num3;
if (flag3)
{
break;
}
bool flag4 = k < 3;
if (flag4)
{
ImageHelper.rgbValues[num4 + k] = 255;
}
else
{
ImageHelper.rgbValues[num4 + k] = 0;
}
}
}
bool flag5 = ImageHelper.rgbValues[num4] > 20;
if (flag5)
{
for (int l = 1; l <= num7; l++)
{
bool flag6 = num4 + l >= num3;
if (flag6)
{
break;
}
bool flag7 = ImageHelper.rgbValues[num4 + l] <= 15;
if (flag7)
{
flag = false;
}
}
}
bool flag8 = ImageHelper.rgbValues[num4] <= 20 || j >= num / 2;
if (flag8)
{
flag = false;
}
ImageHelper.recCheck(ref ImageHelper.rgbValues, num4, height, stride, true);
bool flag9 = num4 + 4 < num3;
if (!flag9)
{
break;
}
num4 += 4;
bool flag10 = j >= num5 & flag;
if (flag10)
{
break;
}
}
bool flag11 = j == num;
if (flag11)
{
num4 += num2;
}
else
{
bool flag12 = num4 + num2 + num - j - 1 >= num3;
if (flag12)
{
break;
}
num4 += (num2 + num - j - 1) / 4 * 4;
}
}
num4 = (num3 - 1) / 4 * 4;
for (int i = height - 1; i >= 0; i--)
{
num4 -= num2;
int j;
for (j = (num - 1) / 4 * 4; j >= 0; j -= 4)
{
bool flag = true;
bool flag13 = ImageHelper.rgbValues[num4] <= 20;
if (flag13)
{
for (int m = 0; m < 4; m++)
{
bool flag14 = num4 + m >= num3;
if (flag14)
{
break;
}
bool flag15 = m < 3;
if (flag15)
{
ImageHelper.rgbValues[num4 + m] = 255;
}
else
{
ImageHelper.rgbValues[num4 + m] = 0;
}
}
}
bool flag16 = ImageHelper.rgbValues[num4] > 20;
if (flag16)
{
for (int n = 1; n <= num7; n++)
{
bool flag17 = num4 - n <= 0;
if (flag17)
{
break;
}
bool flag18 = ImageHelper.rgbValues[num4 - n] <= 20;
if (flag18)
{
flag = false;
}
}
}
bool flag19 = ImageHelper.rgbValues[num4] <= 20 || num / 2 > j;
if (flag19)
{
flag = false;
}
ImageHelper.recCheck(ref ImageHelper.rgbValues, num4, height, stride, false);
bool flag20 = num4 - 4 > 0;
if (!flag20)
{
break;
}
num4 -= 4;
bool flag21 = num6 < height - i;
if (flag21)
{
bool flag22 = j < num - num5 & flag;
if (flag22)
{
break;
}
}
}
bool flag23 = j != -1;
if (flag23)
{
num4 -= j;
}
}
Marshal.Copy(ImageHelper.rgbValues, 0, scan, num3);
bitmap.UnlockBits(bitmapData);
return(bitmap);
}
public unsafe static Bitmap OtsuThreshold(this Image img)
{
Bitmap bitmap = new Bitmap(img);
int width = bitmap.Width;
int height = bitmap.Height;
byte b = 0;
int[] array = new int[256];
int num = 0;
int num2 = 0;
double num3 = 0.0;
double num4 = 0.0;
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
byte * ptr = (byte *)((void *)bitmapData.Scan0);
int num5 = bitmapData.Stride - width * 4;
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
array[(int)(*ptr)]++;
ptr += 4;
}
ptr += num5;
}
bitmap.UnlockBits(bitmapData);
for (int k = 0; k < 256; k++)
{
num3 += (double)(k * array[k]);
num += array[k];
}
double num6 = -1.0;
for (int l = 0; l < 256; l++)
{
num2 += array[l];
int num7 = num - num2;
bool flag = num7 == 0;
if (flag)
{
break;
}
num4 += (double)(l * array[l]);
double num8 = num3 - num4;
double num9 = num4 / (double)num2;
double num10 = num8 / (double)num7;
double num11 = (double)num2 * num9 * num9 + (double)num7 * num10 * num10;
bool flag2 = num11 > num6;
if (flag2)
{
num6 = num11;
b = (byte)l;
}
}
bool flag3 = b == 0;
if (flag3)
{
b = 127;
}
return(ImageHelper.Threshoding(bitmap, b));
}