IEEE Consumer Electronics Magazine - July 2016 - 77
(a)
(b)
(c)
FIGURE 7. LBP and SIFT features: (a) the LBP pattern, (b) the SIFT description, and (c) SIFT features.
Figure 8. The extracted ROI of the second image is manually
rotated by approximately 90°, and the result of the correctly
matched pairs of SIFT features is shown in Figure 9.
As shown in Figure 9, having different scales for the
image does not affect SIFT. But it is still a challenge to find
the exact rotation angle on images with different orientation.
The lines in Figure 9 represent the features that are similar in
both images. In other words, similar features can be correlated using geometric transformation, and this gives useful
results in our proof-of-concept tests.
As our initial text database only had 15 test subjects, the
match results are not statistically significant. Nevertheless, it
was possible to demonstrate close to 100% matching success
on certain subjects, although others were somewhat less reliable. (More recent testing on a much larger database shows a
consistent recognition accuracy of 90%+ based on a single
unconstrained acquisition.)
CONCLUSION
These results are encouraging and show that the palm print
can be used as a practical biometric for handheld devices. It
has the advantage that current state-of-the-art devices provide
excellent image quality without any modifications.
It is advantageous that a natural workflow uses the rear
camera, which on smartphone devices has the best optical
quality, pixel resolution, and illumination normalization. This
means that no additional hardware or image processing is
needed to access and validate palm prints. Our preliminary
results also demonstrate that there are no significant variations in feature extraction among different devices. It was
noted that some devices have better autofocus capabilities,
and it is important to ensure that the acquired images are not
blurred-but this can easily be tested, as an in-focus palm
print has a sharp texture and is easily distinguished from a
blurry acquisition.
The unconstrained use case does pose a number of challenges. First, the segmentation of the hand region can be challenging
if the background region is closely matched to the skin color.
This could easily be overcome by placing some restrictions on
FIGURE 8. The second image to be used for matching.
FIGURE 9. Matched images.
JULY 2016
^
IEEE Consumer Electronics Magazine
77
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