... also allows computer-aided image matching in which the software can search for similar prints for subsequent analysis by the fingerprint expert. The CCD is an electronic imaging system where the process of light capture, is performed by photo diodes. Here each incident photon frees up an electron, which can be stored for a subsequent readout, the charge is then temporarily transferred via a gate from the photo diode to the charge coupled device. The CCD acts like a bucket holding the electrons. The CCD's can be cascaded into arrays in which the electrons can be efficiently moved from one cell to another over long distances to a final readout destination. The reading, which is taken from each array, is directly proportional to the light intensity at that point in the captured image. So just as in conventional photography where silver halide crystals record the level of light intensity, the photo ...

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