| 摘要 |
<p>An improved method and apparatus for decoding bar code symbols using an analysis of the ratios of the module size for the bars and spaces of the bar code. The invention is applicable to any bar code having one or more nominal widths in the bars and spaces, and is particularly useful in bar codes having multiples widths in the specification for the bar code and in situations where the bar code signal has a low signal-to-noise ratio, or is degraded because of a damaged, smudged, or dirty bar code, or where the bar code is read at less than the optimum angle. The invention identifies misdecoded characters and uses adaptive techniques to decode characters previously non-decodable or misdecoded by standard methods, thereby improving the decode rate as compared to prior techniques. The decoding rate is improved without having to re-scan the bar code for a new signal, thereby making the invention particularly useful for high-speed or one-pass decoding operations.</p> |
