Hand Geometry
CSE 717
Why Hand Geometry
 Acceptance UnIntrusive
 Ease of Collection Of Data
 Fast capture/processing
 Small template size
 Uses include Access control, time &
attendance, border crossing
Feature Extraction
 Image Capture
 Preprocessing
 Measurements
 Optimization of the template Size
 Feature Selection & Feature Vector Size
Image Acquisition
Image Acquisition
Using Pegs Pegs Free Hand geometry
Image Capture
 Flat Bed Scanner 150dpi scanner.
 CCD color camera. Color Photograph in
the form of a Jpeg format.
 The Lateral view of the Hand can also be
captured by the mirror placed in the side
to measure heights.
Using Pegs
Raul Sanchez-Reillo Carmen Sanchez-Avila
Ana Gonazalez-Marcos
Preprocessing
 Binarize the Image.
 Rotation n Resizing.
 Extract the Contour of the Image.
Preprocessing
 1st step: Binarize the Image.
I (bw) = [(Ir + Ig) – Ib]
 Resizing n Rotation . Deviation of the hand
are corrected
 Edge Detection Algorithm eg.Sobel
Function
Problems with Using Pegs
Alexandra L.N. Wong1 and Pengcheng Shi2
Deformation of the Shape of the Hand by the Pegs.
Different Placements of the Same Hand
Landmark Extraction Hand Alignment
Applying the border-following Algorithm 1
Alexandra L.N. Wong1 and Pengcheng Shi2
Application of the border-following Algorithm
Feature Extraction
Lengths of four fingers
Widths of four fingers at
2 locations
Shapes of the fingertips
Alexandra L.N. Wong1 and Pengcheng Shi2
Hierarchical Recognition
 Class I : 13 finger lengths and the finger widths
Gaussian mixture Model is used to classify these
features
Andrew W. Moore
Associate Professor
School of Computer Science
Carnegie Mellon University www.cs.cmu.edu/~awm
 Fingertips - class II
Gaussian Mixture Modeling
 Approach bet Statistical n Neural Networks
 Modeling the patterns with determined
number of Gaussian Models
 Weighing Coefficient of Gaussian Model
Mean Covariance Vector are the
characteristic parameters.
GMM cont’d
 Preset Threshold Value of the GMM
Probability Estimation.
 Group II features - Euclidian Dist
Measure bet the sample template
& the given template. Threshold is used to
reject the templates.(eg. 2 pixels)
Results
 Hit Rate :Typical Methods of Comparisons
Euclidean Distance Measure
Group 1 Group 1 and 2
Hit Rate 1 0.8889
FAR 0.1222 0.022
Alexandra L.N. Wong1 and Pengcheng Shi2
Alexandra L.N. Wong1 and Pengcheng Shi2
GMM threshold’s role in reducing the FRR.
Different Comparison Algorithms
Work Done by Other Researchers
 Raul Sanchez-Reillo Carmen Sanchez-Avila
Ana Gonazalez-Marcos have done the
development of the GMM based
comparison Algorithms.
 Alexandra L.N. Wong1 and Pengcheng
Shi2 : Pegs Free Hand based Geometry
Observations:
 GMM obtain the best results
 the other possible comparison algorithms
are Euclidean Hamming Distance based ,
Radial Basis Function RBF Neural
Networks.
 GMM based template require much more
memory than the other comparison based
templates.
Conclusion Future Research
 Ideal for Medium and Low Security based
Biometrics.
 Can be used together with other
Biometrics Palm Prints
 Non Geometrical hand features such as
color can be used .
RKMajji.ppt

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RKMajji.ppt

  • 2. Why Hand Geometry  Acceptance UnIntrusive  Ease of Collection Of Data  Fast capture/processing  Small template size  Uses include Access control, time & attendance, border crossing
  • 3. Feature Extraction  Image Capture  Preprocessing  Measurements  Optimization of the template Size  Feature Selection & Feature Vector Size
  • 4. Image Acquisition Image Acquisition Using Pegs Pegs Free Hand geometry
  • 5. Image Capture  Flat Bed Scanner 150dpi scanner.  CCD color camera. Color Photograph in the form of a Jpeg format.  The Lateral view of the Hand can also be captured by the mirror placed in the side to measure heights.
  • 6. Using Pegs Raul Sanchez-Reillo Carmen Sanchez-Avila Ana Gonazalez-Marcos
  • 7. Preprocessing  Binarize the Image.  Rotation n Resizing.  Extract the Contour of the Image.
  • 8. Preprocessing  1st step: Binarize the Image. I (bw) = [(Ir + Ig) – Ib]  Resizing n Rotation . Deviation of the hand are corrected  Edge Detection Algorithm eg.Sobel Function
  • 9. Problems with Using Pegs Alexandra L.N. Wong1 and Pengcheng Shi2 Deformation of the Shape of the Hand by the Pegs. Different Placements of the Same Hand
  • 10. Landmark Extraction Hand Alignment Applying the border-following Algorithm 1 Alexandra L.N. Wong1 and Pengcheng Shi2 Application of the border-following Algorithm
  • 11. Feature Extraction Lengths of four fingers Widths of four fingers at 2 locations Shapes of the fingertips Alexandra L.N. Wong1 and Pengcheng Shi2
  • 12. Hierarchical Recognition  Class I : 13 finger lengths and the finger widths Gaussian mixture Model is used to classify these features Andrew W. Moore Associate Professor School of Computer Science Carnegie Mellon University www.cs.cmu.edu/~awm  Fingertips - class II
  • 13. Gaussian Mixture Modeling  Approach bet Statistical n Neural Networks  Modeling the patterns with determined number of Gaussian Models  Weighing Coefficient of Gaussian Model Mean Covariance Vector are the characteristic parameters.
  • 14. GMM cont’d  Preset Threshold Value of the GMM Probability Estimation.  Group II features - Euclidian Dist Measure bet the sample template & the given template. Threshold is used to reject the templates.(eg. 2 pixels)
  • 15. Results  Hit Rate :Typical Methods of Comparisons Euclidean Distance Measure Group 1 Group 1 and 2 Hit Rate 1 0.8889 FAR 0.1222 0.022 Alexandra L.N. Wong1 and Pengcheng Shi2
  • 16. Alexandra L.N. Wong1 and Pengcheng Shi2 GMM threshold’s role in reducing the FRR.
  • 18. Work Done by Other Researchers  Raul Sanchez-Reillo Carmen Sanchez-Avila Ana Gonazalez-Marcos have done the development of the GMM based comparison Algorithms.  Alexandra L.N. Wong1 and Pengcheng Shi2 : Pegs Free Hand based Geometry
  • 19. Observations:  GMM obtain the best results  the other possible comparison algorithms are Euclidean Hamming Distance based , Radial Basis Function RBF Neural Networks.  GMM based template require much more memory than the other comparison based templates.
  • 20. Conclusion Future Research  Ideal for Medium and Low Security based Biometrics.  Can be used together with other Biometrics Palm Prints  Non Geometrical hand features such as color can be used .