Symagery Microsystems Inc.

Wenji Xia

Alex Roustaei

Dennis G Priddy

An improved optical code reading system and method that enhances the ability of a reader to locate a symbol within a field of view and enhances the error-correcting properties of the encoding scheme commonly used in 2D bar codes. The reader offsets the effects of damaged finder patterns and missing symbol perimeters and, thereafter, detects high-level symbol information such as the code type, symbol size, and the number of rows and columns in the symbol. The reader then identifies those missing portions of a damaged symbol and marks each missing data bit location with a predetermined indicator. A decoding algorithm then interprets the missing bit indicator as an error of known location (e.g., an &ldquo;erasure&rdquo;), thereby nearly doubling the error correcting strength of all bar codes employing the Reed-Solomon error correction scheme.

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Nepean, Canada

Wenji Xia