Importance

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Abstract

In the present invention, an optical reader is made to commence image capture and decoding when a trigger of the reader is pulled, and to continuously attempt to decode symbols in captured image data until the time the trigger is released. Despite continuously attempting to decode symbols during the entire period in which a trigger is actuated, a reader according to the invention is made so as not to output data messages pertaining to the same symbol more than once during one trigger-actuation period. To this end, a reader operating according to the invention maintains a list of identification strings identifying all symbols which have been successfully decoded since the time the trigger was pulled. When symbols in image data are decoded, identification strings for those symbols are determined and then compared to identification strings previously written to the list. If an identification string for a successfully decoded symbol is not on the list, the reader outputs a data message for the symbol, and adds the identification string to the identification string list.

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First Claim