| 摘要 |
A bar code scanner includes a self-mixing laser sensor. A frequency of the signal output by that sensor is used to determine scanner velocity relative to the bar code, and an amplitude of that signal is used to determine color of bar code bands. Using velocity and amplitude data collected at multiple times during a scan of the bar code, the widths of the bands are calculated. An imaging scanner includes a laser velocimeter that generates velocity data. Using that velocity data, relative displacement between image frames is determined.
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