Table 2.

The detailed differences between the two capturing devices and scenarios used in reference [19] and the proposed method.

	Proposed Method		Reference [19]
Used image	Palmprint image	Palm-dorsum vein image	Palmprint image	Palm vein image
Image captured from	Palm	Palm-drosum	Palm	Palm
Capturing device	Scanner	Infrared camera	camera	Near infrared camera
Capturing scenarios	Peg-free	Peg-free	Use docking device	Use docking device
Sensor material	CMOS	Microbolometer	CMOS	CMOS
Sensor type	Linear	Focal Plane Array	Focal Plane Array	Focal Plane Array
Sensor spectral response	380–750 nm	8–14 μm	380–750 nm	750–1000 nm
Imaging mechanism	Detect reflected visible spectrum	Detect radiated IR spectrum	Detect reflected visible spectrum	Detect reflected NIR spectrum
Image size	845 × 829	320 × 240	768 × 576	768 × 576