Fig 1.
3D ear acquisition system: (a) Our developed 3D ear acquisition device, (b) 2D ear images with laser lines on them, and (c) 3D ear points cloud sample
Fig 2.
Four types of laser triangulation imaging models.
(a) laser point, (b) line scanning, (c) multi-lines scanning and (d) laser grid.
Fig 3.
Principle of the laser-triangulation imaging.
Fig 4.
Architecture of the developed 3-D ear data acquisition device.
(1) CCD camera, (2) camera lens, (3) laser projector, (4) step motor, (5) photoelectric encoder, (6) motion controller, (7) signal and power control box, and (8) device shell.
Fig 5.
Three-Dimensional ear data collection and processing process (the red solid arrows denote the sending command; the green arrows, from “CCD camera / Laser projector” to “Computer”, denote the data transmission of collecting; and the blue arrows, from “Computer” to “3D Ear”, denote data processing).
Fig 6.
Illustration of the parameters for calibration.
Fig 7.
Components of the 3D ear acqusition system.
Fig 8.
Illustration of one-step rotation in laser scanning.
Table 1.
Illustration of parameters variation with different subdivision numbers.
Table 2.
Specifications of core components.
Fig 9.
Three-dimensional ear samples viewed in different angle (each row is collected from one ear).
Fig 10.
Contour maps of different ear samples (the top row is contour maps drawn from one ear, the bottom row is contour maps drawn from another ear).
Fig 11.
Matching results based on database.
(a) Genuine-Impostor distribution curve, (b) ROC curve.
Table 3.
Performance Comparison with commercial scanner (Vivid 910).