private void FingerprintEngineSampleCollected(object sender, ImageCapturedEventArgs e)
{
if (fingerprintImage != null)
{
fingerprintImage.Dispose();
}
fingerprintImage = e.FingerprintImage;
var writableBitmap = new WriteableBitmap(e.FingerprintImage.Width, e.FingerprintImage.Height, e.FingerprintImage.DpiX, e.FingerprintImage.DpiY, PixelFormats.Gray8, BitmapPalettes.Gray256);
writableBitmap.Lock();
writableBitmap.WritePixels(new Int32Rect(0, 0, e.FingerprintImage.Width, e.FingerprintImage.Height), e.FingerprintImage.ImageData, e.FingerprintImage.Width * e.FingerprintImage.BitPerPixel / 8, 0);
writableBitmap.Unlock();
FingerprintImage.Source = writableBitmap;
}
public FingerprintImage Decode()
{
using (var stream = new MemoryStream(Load()))
{
using (var image = Image.FromStream(stream))
{
using (var bitmap = new Bitmap(image))
{
var grayscale = new byte[bitmap.Width * bitmap.Height];
var locked = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
try
{
var pixels = new byte[locked.Stride * locked.Height];
Marshal.Copy(locked.Scan0, pixels, 0, pixels.Length);
for (int y = 0; y < bitmap.Height; ++y)
{
for (int x = 0; x < bitmap.Width; ++x)
{
int sum = 0;
for (int c = 0; c < 3; ++c)
{
sum += pixels[y * locked.Stride + x * 3 + c];
}
grayscale[y * bitmap.Width + x] = (byte)(sum / 3);
}
}
}
finally
{
bitmap.UnlockBits(locked);
}
return(FingerprintImage.Grayscale(bitmap.Width, bitmap.Height, grayscale, new FingerprintImageOptions()
{
Dpi = Dataset.Dpi
}));
}
}
}
}
public static FingerprintImage NonmatchingGray()
{
return(FingerprintImage.Grayscale(333, 435, TestResources.NonmatchingGray()));
}
public static FingerprintImage MatchingGray()
{
return(FingerprintImage.Grayscale(320, 407, TestResources.MatchingGray()));
}
public static FingerprintImage ProbeGray()
{
return(FingerprintImage.Grayscale(332, 533, TestResources.ProbeGray()));
}
