public static Bitmap ImageToBitmap(GrayscaleFloatImage 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 GrayscaleFloatImage FileToGrayscaleFloatImage(string filename) { if (CheckPGM(filename)) { return(ReadPGM(filename)); } Bitmap B = new Bitmap(filename); GrayscaleFloatImage res = BitmapToGrayscaleFloatImage(B); B.Dispose(); return(res); }
public static void ImageToFile(GrayscaleFloatImage image, string filename) { using (Bitmap B = ImageToBitmap(image)) B.Save(filename); }
public static GrayscaleFloatImage BitmapToGrayscaleFloatImage(Bitmap B) { int W = B.Width, H = B.Height; GrayscaleFloatImage res = new GrayscaleFloatImage(W, H); if (B.PixelFormat == PixelFormat.Format8bppIndexed) { Color[] pi = B.Palette.Entries; byte[] pal = new byte[1024]; for (int i = 0; i < pi.Length; i++) { Color C = pi[i]; pal[i * 4] = C.B; pal[i * 4 + 1] = C.G; pal[i * 4 + 2] = C.R; pal[i * 4 + 3] = C.A; } LockBitmapInfo lbi = LockBitmap(B, PixelFormat.Format8bppIndexed, 1); try { for (int j = 0; j < H; j++) { for (int i = 0; i < W; i++) { int c = lbi.data[lbi.linewidth * j + i]; int b = pal[c * 4]; int g = pal[c * 4 + 1]; int r = pal[c * 4 + 2]; res[i, j] = 0.114f * b + 0.587f * g + 0.299f * r; } } } finally { UnlockBitmap(lbi); } } else { LockBitmapInfo lbi = LockBitmap(B); try { for (int j = 0; j < H; j++) { for (int i = 0; i < W; i++) { int b = lbi.data[lbi.linewidth * j + i * 4]; int g = lbi.data[lbi.linewidth * j + i * 4 + 1]; int r = lbi.data[lbi.linewidth * j + i * 4 + 2]; res[i, j] = 0.114f * b + 0.587f * g + 0.299f * r; } } } finally { UnlockBitmap(lbi); } } return(res); }
static GrayscaleFloatImage 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; } GrayscaleFloatImage res = new GrayscaleFloatImage(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(); } }