public static Bitmap Pad(Bitmap image, int newWidth, int newHeight)
{
int width = image.Width;
int height = image.Height;
/*
* It is always guaranteed that,
*
* width < newWidth
*
* and
*
* height < newHeight
*/
if ((width < newWidth && height < newHeight) ||
(width < newWidth && height == newHeight) ||
(width == newWidth && height < newHeight))
{
Bitmap paddedImage = Grayscale.CreateGrayscaleImage(newWidth, newHeight);
BitmapLocker inputImageLocker = new BitmapLocker(image);
BitmapLocker paddedImageLocker = new BitmapLocker(paddedImage);
inputImageLocker.Lock();
paddedImageLocker.Lock();
int startPointX = (int)Math.Ceiling((double)(newWidth - width) / (double)2) - 1;
int startPointY = (int)Math.Ceiling((double)(newHeight - height) / (double)2) - 1;
for (int y = startPointY; y < (startPointY + height); y++)
{
for (int x = startPointX; x < (startPointX + width); x++)
{
int xxx = x - startPointX;
int yyy = y - startPointY;
paddedImageLocker.SetPixel(x, y, inputImageLocker.GetPixel(xxx, yyy));
string str = string.Empty;
}
}
paddedImageLocker.Unlock();
inputImageLocker.Unlock();
return(paddedImage);
}
else if (width == newWidth && height == newHeight)
{
return(image);
}
else
{
throw new Exception("Pad() -- threw an exception");
}
}
public static Bitmap ToBitmap(double[,] input)
{
int width = input.GetLength(0);
int height = input.GetLength(1);
Bitmap output = Grayscale.CreateGrayscaleImage(width, height);
BitmapData data = output.LockBits(new Rectangle(0, 0, width, height),
ImageLockMode.WriteOnly,
output.PixelFormat);
int pixelSize = System.Drawing.Image.GetPixelFormatSize(PixelFormat.Format8bppIndexed) / 8;
int offset = data.Stride - width * pixelSize;
double Min = 0.0;
double Max = 255.0;
unsafe
{
byte *address = (byte *)data.Scan0.ToPointer();
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
double v = 255 * (input[x, y] - Min) / (Max - Min);
byte value = unchecked ((byte)v);
for (int c = 0; c < pixelSize; c++, address++)
{
*address = value;
}
}
address += offset;
}
}
output.UnlockBits(data);
return(output);
}
