private byte FindAverageThreshold(int min, int max)
{
int threshold = 0, count = 0;
unsafe
{
BitmapData bitmapData = ProcessedBitmap.LockBits(new Rectangle(0, 0, ProcessedBitmap.Width, ProcessedBitmap.Height), ImageLockMode.ReadWrite, ProcessedBitmap.PixelFormat);
int bytesPerPixel = Image.GetPixelFormatSize(ProcessedBitmap.PixelFormat) / 8;
int heightInPixels = bitmapData.Height;
int widthInBytes = bitmapData.Width * bytesPerPixel;
byte *ptrFirstPixel = (byte *)bitmapData.Scan0;
Parallel.For(0, heightInPixels, y =>
{
byte *currentLine = ptrFirstPixel + (y * bitmapData.Stride);
for (int x = 0; x < widthInBytes; x = x + bytesPerPixel)
{
int blue = currentLine[x];
int green = currentLine[x + 1];
int red = currentLine[x + 2];
var intensity = (byte)(0.3 * red + 0.6 * green + 0.1 * blue);
if ((intensity >= min) && (intensity <= max))
{
threshold += intensity;
count++;
}
}
});
ProcessedBitmap.UnlockBits(bitmapData);
}
return((byte)(threshold / count).TruncateRgb());
}
public void SetUpColors()
{
unsafe
{
BitmapData bitmapData = ProcessedBitmap.LockBits(new Rectangle(0, 0, ProcessedBitmap.Width, ProcessedBitmap.Height), ImageLockMode.ReadWrite, ProcessedBitmap.PixelFormat);
int bytesPerPixel = Image.GetPixelFormatSize(ProcessedBitmap.PixelFormat) / 8;
int heightInPixels = bitmapData.Height;
int widthInBytes = bitmapData.Width * bytesPerPixel;
byte *ptrFirstPixel = (byte *)bitmapData.Scan0;
for (int y = 0; y < heightInPixels; y++)
{
byte *currentLine = ptrFirstPixel + (y * bitmapData.Stride);
for (int x = 0; x < widthInBytes; x = x + bytesPerPixel)
{
int b = currentLine[x];
int g = currentLine[x + 1];
int r = currentLine[x + 2];
var color = Color.FromArgb(r, g, b);
if (!_colorList.Contains(color))
{
}
_colorList.Add(color);
}
}
ProcessedBitmap.UnlockBits(bitmapData);
}
}
