Registers – Coded record sensors – Particular sensor structure
Patent
1993-08-06
1995-08-29
Evans, F. L.
Registers
Coded record sensors
Particular sensor structure
G06K 710
Patent
active
054462711
ABSTRACT:
A method and apparatus for reading encoded symbols such as bar code labels at any orientation to a raster scanning device. 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. 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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Ronald E. Crochiere and Lawrence R. Rabiner, Multirate Digital Signal Processing (Prentice-Hall, 1983), pp. 20-29.
Actis Robert J.
Cherry Craig D.
Evans F. L.
Spectra-Physics Scanning Systems, Inc.
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