public static Bitmap ImageToBitmap(GrayscaleFloatImageFormat image)
{
Bitmap b = new Bitmap(image.Width, image.Height, PixelFormat.Format24bppRgb);
LockBitmapInfo lbi = LockBitmap(b);
try
{
for (int j = 0; j < image.Height; j++)
{
for (int i = 0; i < image.Width; i++)
{
byte c = image[i, j] < 0.0f ? (byte)0 : image[i, j] > 255.0f ? (byte)255 : (byte)image[i, j];
lbi.data[lbi.linewidth * j + i * 4] = c;
lbi.data[lbi.linewidth * j + i * 4 + 1] = c;
lbi.data[lbi.linewidth * j + i * 4 + 2] = c;
}
}
}
finally
{
UnlockBitmap(lbi);
}
return(b);
}
public static void ImageToFile(GrayscaleFloatImageFormat image, string filename)
{
using (Bitmap b = ImageToBitmap(image))
b.Save(filename);
}
static GrayscaleFloatImageFormat ReadPGM(string filename)
{
FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
try
{
while (true)
{
string str = ReadString(fs).Trim();
if (str == null)
{
return(null);
}
else if (str == "" || str.StartsWith("#"))
{
continue;
}
else if (str != "P5")
{
return(null);
}
else
{
break;
}
}
int Width = -1, Height = -1, MaxL = -1;
while (true)
{
string str = ReadString(fs).Trim();
if (str == null)
{
return(null);
}
else if (str == "" || str.StartsWith("#"))
{
continue;
}
string[] arr = str.Split(' ', '\t');
Width = int.Parse(arr[0]);
Height = int.Parse(arr[1]);
break;
}
while (true)
{
string str = ReadString(fs).Trim();
if (str == null)
{
return(null);
}
else if (str == "" || str.StartsWith("#"))
{
continue;
}
MaxL = int.Parse(str);
break;
}
GrayscaleFloatImageFormat res = new GrayscaleFloatImageFormat(Width, Height);
if (MaxL <= 255)
{
byte[] raw = new byte[Width * Height];
fs.Read(raw, 0, raw.Length);
for (int j = 0; j < Height; j++)
{
for (int i = 0; i < Width; i++)
{
res[i, j] = raw[j * Width + i];
}
}
}
else
{
byte[] raw = new byte[Width * Height * 2];
fs.Read(raw, 0, raw.Length * 2);
for (int j = 0; j < Height; j++)
{
for (int i = 0; i < Width; i++)
{
res[i, j] = raw[(j * Width + i) * 2] + raw[(j * Width + i) * 2 + 1] * 255;
}
}
}
return(res);
}
finally
{
fs.Close();
}
}
