/// <summary>
/// Return the segmentation-derived mask for the character.
/// This may optionally be grown by some pixels.
/// </summary>
public override void GetMask(out Rect r, ref Bytearray outmask, int index, int grow)
{
r = boxes.At1d(index).Grow(grow);
r.Intersect(new Rect(0, 0, labels.Dim(0), labels.Dim(1)));
if (fullheight)
{
r.y0 = 0;
r.y1 = labels.Dim(1);
}
int x = r.x0, y = r.y0, w = r.Width(), h = r.Height();
Intarray segs = segments.At1d(index);
outmask.Resize(w, h);
outmask.Fill(0);
for (int i = 0; i < w; i++)
{
for (int j = 0; j < h; j++)
{
int label = labels[x + i, y + j];
if (NarrayUtil.first_index_of(segs, label) >= 0)
{
outmask[i, j] = (byte)255;
}
}
}
if (grow > 0)
{
Morph.binary_dilate_circle(outmask, grow);
}
}
public static Bitmap read_image_gray(Bytearray image, string path)
{
Bitmap bitmap = LoadBitmapFromFile(path);
image.Resize(bitmap.Width, bitmap.Height);
ImgRoutine.NarrayFromBitmap(image, bitmap);
return bitmap;
}
public static Bitmap read_image_gray(Bytearray image, string path)
{
Bitmap bitmap = LoadBitmapFromFile(path);
image.Resize(bitmap.Width, bitmap.Height);
ImgRoutine.NarrayFromBitmap(image, bitmap);
return(bitmap);
}
public static Bitmap read_image_binary(Bytearray image, string path)
{
Bitmap bitmap = LoadBitmapFromFile(path);
image.Resize(bitmap.Width, bitmap.Height);
ImgRoutine.NarrayFromBitmap(image, bitmap);
double threshold = (NarrayUtil.Min(image) + NarrayUtil.Max(image)) / 2.0;
for (int i = 0; i < image.Length1d(); i++)
image.Put1d(i, (byte)((image.At1d(i) < threshold) ? 0 : 255));
return bitmap;
}
public static Bitmap read_image_binary(Bytearray image, string path)
{
Bitmap bitmap = LoadBitmapFromFile(path);
image.Resize(bitmap.Width, bitmap.Height);
ImgRoutine.NarrayFromBitmap(image, bitmap);
double threshold = (NarrayUtil.Min(image) + NarrayUtil.Max(image)) / 2.0;
for (int i = 0; i < image.Length1d(); i++)
{
image.Put1d(i, (byte)((image.At1d(i) < threshold) ? 0 : 255));
}
return(bitmap);
}
/// <summary>
/// Get a mask at a given location
/// </summary>
public override void GetMaskAt(ref Bytearray mask, int index, Rect b)
{
if (!(b.x0 > -1000 && b.x1 < 10000 && b.y0 > -1000 && b.y1 < 10000))
{
throw new Exception("CHECK: (b.Left > -1000 && b.Right < 10000 && b.Top > -1000 && b.Bottom < 10000)");
}
mask.Resize(b.Width(), b.Height());
mask.Fill(0);
Intarray segs = segments.At1d(index);
int w = b.Width(), h = b.Height();
for (int i = 0; i < w; i++)
{
int x = b.x0 + i;
unchecked
{
if ((uint)x >= labels.Dim(0))
{
continue;
}
}
for (int j = 0; j < h; j++)
{
int y = b.y0 + j;
unchecked
{
if (((uint)y) >= labels.Dim(1))
{
continue;
}
}
int label = labels[b.x0 + i, b.y0 + j];
if (NarrayUtil.first_index_of(segs, label) >= 0)
{
mask[i, j] = (byte)255;
}
}
}
}
/// <summary>
/// Convert Bitmap image to any Narray
/// </summary>
public static unsafe void NarrayFromBitmap <T>(Narray <T> outarray, Bitmap bitmap, bool maxrgb = false, bool yflip = true)
{
if (bitmap.PixelFormat == PixelFormat.Format1bppIndexed)
{
bitmap = new Bitmap(bitmap);
}
int w = bitmap.Width;
int h = bitmap.Height;
Bytearray imgRgb = new Bytearray();
imgRgb.Resize(w, h, 3);
// lock source image
BitmapData imageData = bitmap.LockBits(
new Rectangle(0, 0, w, h),
ImageLockMode.ReadOnly, bitmap.PixelFormat);
int srcOffset = imageData.Stride - w;
int pixelOffset = 1, r = 0, g = 0, b = 0;
float cr = 0.5f, cg = 0.419f, cb = 0.081f; // RMY convert method
Color[] palette = null;
// check image format
if (bitmap.PixelFormat == PixelFormat.Format32bppArgb || bitmap.PixelFormat == PixelFormat.Format32bppRgb)
{
pixelOffset = 4;
srcOffset = imageData.Stride - w * pixelOffset;
r = 2; g = 1; b = 0;
// get palette
palette = new Color[256];
// init palette
for (int i = 0; i < 256; i++)
{
palette[i] = Color.FromArgb(i, i, i);
}
}
else if (bitmap.PixelFormat != PixelFormat.Format8bppIndexed)
{
pixelOffset = 3;
srcOffset = imageData.Stride - w * pixelOffset;
r = 2; g = 1; b = 0;
// get palette
palette = new Color[256];
// init palette
for (int i = 0; i < 256; i++)
{
palette[i] = Color.FromArgb(i, i, i);
}
}
else
{
palette = bitmap.Palette.Entries;
}
// process convert the image to RGB Bytearray
byte *src = (byte *)imageData.Scan0.ToPointer( );
int yres;
// for each line
//for (int y = h - 1; y >= 0; y--)
for (int y = 0; y < h; y++)
{
// for each pixel
for (int x = 0; x < w; x++, src += pixelOffset)
{
yres = y;
if (yflip)
{
yres = h - y - 1;
}
imgRgb[x, yres, 0] = palette[src[r]].R;
imgRgb[x, yres, 1] = palette[src[g]].G;
imgRgb[x, yres, 2] = palette[src[b]].B;
}
src += srcOffset;
}
// unlock image
bitmap.UnlockBits(imageData);
// copy to output array
if (outarray.Rank() == 3)
{
outarray.Copy(imgRgb);
}
else if (outarray.Rank() == 2)
{
// resize output array
outarray.Resize(w, h);
// packed image
if (typeof(T).Name == "Int32")
{
for (int y = 0; y < h; y++)
{
// for each RGB pixel convert to Gray
for (int x = 0; x < w; x++)
{
outarray[x, y] = (T)Convert.ChangeType(
((imgRgb[x, y, 0] << 16) | (imgRgb[x, y, 1] << 8) | (imgRgb[x, y, 2])),
typeof(T));
}
}
}
else // gray image
{
for (int x = 0; x < w; x++)
{
// for each RGB pixel convert to Gray
for (int y = 0; y < h; y++)
{
if (maxrgb)
{
outarray[x, y] = (T)Convert.ChangeType(
Convert.ToByte(Math.Max(Math.Max(imgRgb[x, y, 0], imgRgb[x, y, 1]), imgRgb[x, y, 2])),
typeof(T));
}
else
{
outarray[x, y] = (T)Convert.ChangeType(
Convert.ToByte(cr * imgRgb[x, y, 0] + cg * imgRgb[x, y, 1] + cb * imgRgb[x, y, 2]),
typeof(T));
}
}
}
}
}
else
{
throw new ArgumentException("NarrayFromBitmap: array rank must be 2 or 3");
}
}
public Bytearray ToBytearray()
{
Bytearray ba = new Bytearray();
ba.Resize(Width, Height);
int yput;
for (int y = 0; y < Height; y++)
{
yput = Height - y - 1;
for (int x = 0; x < Width; x++)
ba.Put(x, yput, Get(y, x));
}
return ba;
}
