Method and apparatus for decoding bar code symbols
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United States of America Patent
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Nov 28, 2000
Grant Date -
N/A
app pub date -
Aug 12, 1998
filing date -
Aug 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for reading and decoding one-dimensional (1D) bar code symbols. A 1D bar code symbol is imaged by an optical assembly which includes a cubic phase mask that causes the optical transfer function of the optical assembly to remain approximately constant over a range of distances between the apparatus and the symbol to be read. An electrical representation of the resulting image is converted to a smoothly varying analog image signal. A transition identifying circuit processes the analog image signal, without first applying a recovery function that takes into account the effect of the phase mask, and generates a binary signal which is used to decode the symbol.
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