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Live-Scan Sensors - Coggle Diagram
Live-Scan Sensors
Optical
Optical fiber
DISADVANTAGE
its size has to cover the whole sensing area, resulting in a high cost
composed by fiber optic plate wich substitutes the prism and lens, camera (CCD, CMOS)
FTIR
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composed by light source, prism, camera (CCD, CMOS)
Direct reading
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composed by one or multiple high-quality CCD/CMOS cameras, the finger is not in contact with any surface
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Solid-State
Sweep sensor
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DISATVANTAGE
uncomfortable and not natural way of acquisition, image reconstruction can be time consuming
require image reconstruction, overlapping between adjacent slices. Composed by: Slice quality computation, Slice pair registration, Relaxation, Mosaicking
Small area sensor
during user enrollment, multiple acquisitions of the same finger, during the user recognition small area is matched against the reference fingerprint
quality of a pre-processed fingerprint is related to finger condition, sensor performance
tend to reduce the sensing area to lower the cost, they capture only a partial fingerprint with mechanical guides
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Capacitive sensors
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DISADVANTAGES
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protective layer required to avoid ESD, physical scratching and chemical corrosion
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based on a two-dimensional array of micro-capacitor plates. When a finger is places on the chip, localized capacitance of the micro-capacitors varies as a function of the distance between plates
Electro-Optical
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has 2D photo-eletric image sensor, transparent layer and a light-emitting component