Patent ID: 8840025
Filing Date: 2014-09-23
Classification: G06K

Abstract:
1. An arrangement for preventing a misread of a one-dimensional symbol that is read in either one of two polarities in an electro-optical reader, the arrangement comprising: a data capture assembly for capturing light from the symbol, and for generating an electrical signal indicative of the captured light, wherein the symbol has bars alternating with spaces, wherein the bars have less reflectivity than the spaces when the symbol is a normal code of one of the polarities, and wherein the spaces have less reflectivity than the bars when the symbol is an inverse code of the other of the polarities; a controller operative for determining whether the electrical signal is indicative of one of a GS1 DataBar-14 symbol and a GS1 DataBar Expanded symbol, each having finder patterns of bars and spaces differently decodable in the two polarities; and wherein, in the event that electrical signal is indicative of one of a GS1 DataBar-14 symbol and a GS1 DataBar Expanded symbol, the controller is further operative for simultaneously processing and decoding the electrical signal as a first decoded result of one of the polarities and as a second decoded result of the other of the polarities, for determining validity of the first and second decoded results, and for generating an output in dependence upon the validity determination.