Registers – Coded record sensors – Particular sensor structure
Patent
1994-12-23
1998-06-23
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
235472, 235454, 235467, 235470, 250201, 250568, 359565, 359 30, G06K 710
Patent
active
057708479
ABSTRACT:
A method and apparatus are provided for reading bar codes or other images while reducing or eliminating the need for self-generated illumination. An image reader comprises an efficient optical collection system including an aperture with a high aspect ratio and/or a multi-focal lens or lenses. A CCD detector receives collected light and is coupled to an adaptive exposure circuit for preventing saturation of a CCD detector at high illumination levels. A correlated double sampling circuit receives the output of the CCD detector to allow lower light levels to be detected by the system. The correlated double sampling circuit is connected to a signal processing block which uses a derivative based technique for enhanced edge detection. Edge detection information may be provided to a decoder for decoding. Various other embodiments may utilize some but not all of the above elements, or may include additional refinements, while obtaining the benefit of reducing or eliminating the need for self-generated illumination.
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Hajec Donald T.
Lee Michael G.
Spectra-Physics Scanning Systems, Inc.
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