Registers – Coded record sensors – Particular sensor structure
Patent
1998-09-28
2000-06-13
Lee, Michael G
Registers
Coded record sensors
Particular sensor structure
235454, 23546232, 23547201, 250201, 250568, 359 30, 359565, G06K 710
Patent
active
060738510
ABSTRACT:
A method and apparatus for reading bar codes or other images while reducing or eliminating the need for self-generated illumination. An image reader is preferably embodied as a handheld unit and comprises an efficient optical collection system including an aperture with a high aspect ratio and/or a multi-focal lens or lenses. An optically transmissive spacer affixed to the front of the handheld unit allows ambient light to be collected at close range, and a diffuser may be used to reflect ambient light from the handheld unit to provide additional illumination at close range. A masked CCD detector with rectangular pixels receives collected light and is coupled to an adaptive exposure circuit for preventing saturation of the CCD detector at high illumination levels. A correlated double sampling circuit coupled to the adaptive exposure circuit rejects common mode noise and allows operation in lower light levels. The correlated double sampling circuit is connected to a signal processor which uses a derivative based technique for detecting edges of the image. A decoder uses the edge detection information to decode encoded information from the image.
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Acosta Jorge L.
Ahten Michael J.
Huss Paul R.
McQueen Alexander M.
Olmstead Bryan L.
Lee Michael G
Spectra-Physics Scanning Systems, Inc.
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