Patent
Method of scanning indicia using selective sampling
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TLDR
In this article, a method of reading an indicia, comprising areas of differing light reflectivity, comprises producing an electrical signal representative of light reflected from the indicia and selectively sampling the signal at a rate well below the Nyquist rate.Abstract:
A method of reading an indicia, for example a bar code, comprising areas of differing light reflectivity comprises producing an electrical signal representative of light reflected from the indicia and selectively sampling the signal at a rate well below the Nyquist rate. The sample points are not uniform, and are chosen to represent key features in the signal. An attempt is then made to decode the indicia, using the samples. If the decode is unsuccessful, the samples which have been collected are analyzed to provide information on the extent to which they represent true data corresponding to the indicia, and the extent to which they present noise. Signal collection and/or processing and/or sampling is then adjusted and the process is repeated. The continual feed-back of information related to the scanning environment allows more aggressive decoding techniques to be used.read more
Citations
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References
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Patent
Narrow-bodied, single-and twin-windowed portable laser scanning head for reading bar code symbols
TL;DR: In this paper, a narrow-bodied, single-and twin-windowed, hand-held, laser scanning head for reading bar code symbols includes at least one window mounted at the rear region of the head, and through which either the incident beam going to the symbol and/or the reflected beam returning from the symbol, passes unobstructedly and exteriorly of, and past, the front and intermediate body regions of the leader.
Patent
Packet data communication network
TL;DR: In this paper, a packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system.
Patent
Portable laser scanning system and scanning methods
TL;DR: An entirely field-portable laser scanning system for reading bar code symbols includes a light-weight and small-sized laser scanning head as discussed by the authors, which can be bracket-mounted or hand-held.
Patent
Portable laser diode scanning head
Boris Metlitsky,Mark Krichever,Jerome Swartz,Eric F. Barkan,Howard Shepard,Edward Barkan,Alexander M Adelson +6 more
TL;DR: In this paper, a portable laser diode scanning head, aimed at each symbol to be read, emits and receives non-readily visible laser light, and is equipped with a trigger-actuated aiming light arrangement for visually locating and tracking each symbol.
Journal ArticleDOI
Algorithms for Shape Analysis of Contours and Waveforms
TL;DR: Algorithms for shape analysis are reviewed and classified under various criteria, whether they examine the boundary only or the whole area and whether they describe the original picture in terms of scalar measurements or through structural descriptions.