public static Region ConvertFromTransparentBitmap(UnsafeBitmap imageRegion, Color transparentColor)
{
// First we get the dimensions of our image
GraphicsUnit aPixel = GraphicsUnit.Pixel;
RectangleF imageBoundsF = imageRegion.GetBounds(ref aPixel);
int imageWidth = Convert.ToInt32(imageBoundsF.Width);
int imageHeight = Convert.ToInt32(imageBoundsF.Height);
// This will be the path for our Region
GraphicsPath regionPath = new GraphicsPath();
// We loop over every line in our image, and every pixel per line
for (int intY = 0; intY < imageHeight; intY++)
{
for (int intX = 0; intX < imageWidth; intX++)
{
if (imageRegion.GetPixel(intX, intY) != transparentColor)
{
// We have to see this pixel!
regionPath.AddRectangle(new Rectangle(intX, intY, 1, 1));
}
}
}
Region formRegion = new Region(regionPath);
regionPath.Dispose();
return(formRegion);
} /* ConvertFromTransparentBitmap */
/// <summary>
/// This method will generate an image from the provided data. It will
/// also zero out any values that fall below the lowBoundary parameter.
/// This is a good way to eliminate a lot of noise.
/// </summary>
/// <param name="data"></param>
/// <param name="lowBoundary"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public static Bitmap generateImage(int[] data, int lowBoundary, int width, int height)
{
int count = 0;
int value = 0;
Bitmap result = null;
using (UnsafeBitmap bitmap = new UnsafeBitmap(new Bitmap(width, height)))
{
PixelData pdata;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
value = data[count++];
if (value < lowBoundary)
{
value = 0;
}
pdata.red = pdata.green = pdata.blue = (byte)value;
bitmap.SetPixel(x, y, pdata);
}
}
bitmap.UnlockBitmap();
result = new Bitmap(bitmap.Bitmap);
}
return(result);
}
public static Point PixelSize(UnsafeBitmap bitmap)
{
GraphicsUnit unit = GraphicsUnit.Pixel;
RectangleF bounds = bitmap.GetBounds(ref unit);
return(new Point((int)bounds.Width, (int)bounds.Height));
}
public static double[] ExtractGreyValues(UnsafeBitmap bitmap)
{
Point size = PixelSize(bitmap);
double[] data = new double[size.Y * size.X];
int count = 0;
for (int y = 0; y < size.Y; y++)
{
for (int x = 0; x < size.X; x++)
{
Color c = bitmap.GetPixel(x, y);
double dvalue = (0.299 * c.R) + (0.587 * c.G) + (0.114 * c.B);
data[count++] = dvalue;
}
}
return(data);
}
