/// <summary>
/// Extract fingerprint featuries.
/// </summary>
public byte[] Extract(FingerprintImage fingerprintImage, ExtractionType extractionType)
{
if (!isInitialized)
{
throw new InvalidOperationException("Initialize FingerprintFeatureExtractor first.");
}
if (isDisposed)
{
throw new ObjectDisposedException(GetType().Name);
}
if (fingerprintImage == null)
{
throw new ArgumentNullException("fingerprintImage");
}
var featureSetSizeRecommended = 0;
var featureSetSizeMinimum = 0;
CalculateFeatureSizeCore(extractionType, ref featureSetSizeRecommended, ref featureSetSizeMinimum);
if (featureSetSizeRecommended <= 0)
{
throw new OutOfMemoryException();
}
var fdFeatures = Marshal.AllocHGlobal(featureSetSizeRecommended);
var pImageQuality = (int)FT_IMG_QUALITY.FT_UNKNOWN_IMG_QUALITY;
var pFeaturesQualit = (int)FT_FTR_QUALITY.FT_UNKNOWN_FTR_QUALITY;
var featureSetCreated = 0;
ExtractFeaturesCore(fxContextHandle, fingerprintImage.OriginalFingerprintImageSize, fingerprintImage.OriginalFingerprintImage, (int)extractionType,
featureSetSizeRecommended, fdFeatures, ref pImageQuality, ref pFeaturesQualit, ref featureSetCreated);
if (featureSetCreated == 0 ||
pImageQuality != (int)FT_IMG_QUALITY.FT_GOOD_IMG ||
pFeaturesQualit != (int)FT_FTR_QUALITY.FT_GOOD_FTR)
{
throw new InvalidOperationException("Cannot extract features.");
}
var featuriesData = new byte[featureSetSizeRecommended];
Marshal.Copy(fdFeatures, featuriesData, 0, featureSetSizeRecommended);
Marshal.FreeHGlobal(fdFeatures);
return(featuriesData);
}
private void FingerprintEngineSampleCollected(object sender, ImageCapturedEventArgs e)
{
if (fingerprintImage != null)
{
fingerprintImage.Dispose();
}
fingerprintImage = e.FingerprintImage;
var writableBitmap = new WriteableBitmap(fingerprintImage.Width, fingerprintImage.Height, fingerprintImage.DpiX, fingerprintImage.DpiY, PixelFormats.Gray8, BitmapPalettes.Gray256);
writableBitmap.Lock();
writableBitmap.WritePixels(new Int32Rect(0, 0, fingerprintImage.Width, fingerprintImage.Height), fingerprintImage.ImageData, fingerprintImage.Width * fingerprintImage.BitPerPixel / 8, 0);
writableBitmap.Unlock();
FingerprintImage.Source = writableBitmap;
//var fpImage = new Services.Fingerprints.FingerprintImage();
//fpImage.Header.DeviceType = 49264417347272704;
//fpImage.Format.Bpp = PixelFormats.Gray8.BitsPerPixel;
//fpImage.Format.ColorRepresentation = FingerprintImageColorRepresantation.NoColorRepresentation;
//fpImage.Format.Height = fingerprintImage.Height;
//fpImage.Format.Width = fingerprintImage.Width;
//fpImage.Format.DpiX = fingerprintImage.DpiX;
//fpImage.Format.DpiY = fingerprintImage.DpiY;
//fpImage.Format.ImageType = FingerprintImageType.GrayScale;
//fpImage.Format.Padding = FingerprintImagePadding.RightPadding;
//fpImage.Format.Polarity = FingerprintImagePolarity.PositivePolarity;
//fpImage.Format.SignificantBpp = 8;
//fpImage.Format.Planes = 1;
//fpImage.Data = fingerprintImage.ImageData;
//fingerprintEnrollmentData.Add(new BiometricSample(fpImage,
// BiometricSampleHeaderType.DigitalPersonaFingerprintImage));
using (var fe = new FingerprintFeatureExtractor())
{
fe.Initialize();
var featuries = fe.Extract(fingerprintImage, ExtractionType.FeatureSetForEnrollment);
fingerprintEnrollmentData.Add(new BiometricSample(featuries,
BiometricSampleHeaderType.DigitalPersonaFingerprintFeatureSet));
}
}
private void ImageCaptured(DATA_BLOB data)
{
var imageInformationPtr = Marshal.AllocHGlobal((int)data.cbData);
CopyMemory(imageInformationPtr, data.pbData, data.cbData);
var imageInformation = (FD_IMAGE)Marshal.PtrToStructure(imageInformationPtr, typeof(FD_IMAGE));
var imagePtr = imageInformationPtr + (int)imageInformation.uOffsetToImage;
var imageWidth = imageInformation.Header.ImageFormat.iWidth;
var imageHeigth = imageInformation.Header.ImageFormat.iHeight;
var imageBpp = (int)imageInformation.Header.ImageFormat.uBPP;
var imageData = new byte[(imageWidth * imageHeigth * imageBpp + 7) / 8];
Marshal.Copy(imagePtr, imageData, 0, imageData.Length);
var fingerprintImage = new FingerprintImage(imageData, imageWidth, imageHeigth, imageBpp,
imageInformation.Header.ImageFormat.iXdpi, imageInformation.Header.ImageFormat.iYdpi, imageInformationPtr, (int)imageInformation.uSize);
OnSampleCollected(new ImageCapturedEventArgs(fingerprintImage));
}
public ImageCapturedEventArgs(FingerprintImage fingerprintImage)
{
FingerprintImage = fingerprintImage;
}
