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At present, more than 99% of the packages in the grocery stores have been marked by the manufacturer with laser scannable UPC symbols and the installation of laser based optical readers is expected to expand into all stores. This paper describes a laser based reader that was designed and engineered for reliable,high speed and safety uses in an ordinary store environment.Areas to be discussed are:laser/optics scan pattern generation,signal processor,characteristics and encodation of the UPC and the laser safety program.
Charles C. K. Cheng
"A laser based high performance universal product code reader", Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12301D (1 July 1990); https://doi.org/10.1117/12.2294686
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Charles C. K. Cheng, "A laser based high performance universal product code reader," Proc. SPIE 1230, International Conference on Optoelectronic Science and Engineering '90, 12301D (1 July 1990); https://doi.org/10.1117/12.2294686