Registers – Coded record sensors – Particular sensor structure
Patent
1997-06-02
2000-11-07
Lee, Michael G
Registers
Coded record sensors
Particular sensor structure
23546232, 23546243, 235459, 209583, 1985021, 19881001, G06K 710
Patent
active
061423769
ABSTRACT:
A method and apparatus for reading encoded symbols such as bar code labels at any orientation to a raster scanning device. Objects bearing encoded symbols are transported from one conveyor across a relatively narrow gap to a second conveyor, with a linear scanner positioned beneath the conveyors so as to read the encoded symbols through the narrow gap as the objects pass over. A pattern of virtual scan lines is selected over the two-dimensional imaging region according to the specifications of the images to be read. The pattern is generated by defining a family of parallel lines of a certain spacing and rotating the family by a specified angle until the two-dimensional imaging region is covered. In a preferred embodiment, only the data at selected raster locations on the virtual scan lines is stored and processed. One-dimensional signal processing methods are used to detect edges and decode the encoded symbols.
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Actis Robert J.
Cherry Craig D.
Lee Michael G
Spectra-Physics Scanning Systems, Inc.
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