Information Technology Reference
In-Depth Information
d
ij-ij
- is the size of areas between individual hand bones,
g
śri
- is the thickness of the
i
th
metacarpus bone, for
i
= {I, II, III, IV, V},
d
śri
- is the length of the
i
th
metacarpus bone,
g
n
- is the size of wrist bones.
Introducing a formalism for the biometric notation of hand geometry makes it
possible to precisely identify the person to whom a given vector of data has been
assigned. At the same time, the biometric traits that characterise the specific per-
son can be precisely established. The biometric feature vector can be comple-
mented with new data presenting:
•
the shape of the fingerprints of this hand;
•
the shape of the lines of the palm;
•
the shape of the complete handprint.
This situation is shown in Figure 6.6 in which the shapes of fingerprints of par-
ticular fingers are shown in blue, and the shape of palm lines in green. All the ar-
eas marked illustrate the third case, i.e. the shape of the entire handprint.
Fig. 6.6.
Characteristic features of hand geometry
For an example of biometric features thus illustrated, the following formalism
for the biometric recording of physical features of hand bones was defined. It has
the following form:
L
dl
= {
K
i
,
O
j
},
i
= {1,...,5},
j
= {1,...,3}
where:
K
i
- denotes the print of the i
th
finger of the hand (from one to five),
O
j
- the shape of one of the three biometric prints of the palm.
