Importance

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Abstract

A color symbology, such as a bar code symbology, employs three or more colors to encode elements of one or more integer-widths. A light source or an appropriate filter of a color matched to one color of the symbology produces peaks in a reflectance signal produced from a light sensor, which receives light reflected from the symbol. Another, unmatched, color in the symbology produces valleys in the reflectance profile. A third or intermediate color produces a reflectance signal in a middle portion of the reflectance profile. By identifying the peaks and valleys in the profile, the portions corresponding to the intermediate color, may be found by measuring distances between centers of the peaks and valleys in the reflectance profile. As a result, all elements, of all colors in the symbol, may be decoded using a simple data collection reader, such as a laser scanner, employing only a single color laser.

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First Claim