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Proceedings Paper

Edge detection in the presence of speckle noise in barcode scanning systems
Author(s): Emanuel Marom; Sasa Kresic-Juric
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Paper Abstract

Speckle noise is inherent to laser barcode scanners since barcodes are usually printed on diffusive surfaces which generate speckle when illuminated by spatially coherent beams. In this paper statistical properties of barcode signals corrupted by speckle noise are analyzed. We derive closed form expressions for the autorcorrelation function and power spectral density of speckle noise for scanning beams with arbitrary field distributions. Since differentiation is often used for enhancement of barcode edges, we also analyze the properties of differentiated speckle noise. We derive estimates for signal-to-noise ratio when a laser beam scans over an edge. The random edge jitter in a barcode signal caused by speckle noise is also analyzed. The theory is illustrated by applying the results to Gaussian beams.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516672
Show Author Affiliations
Emanuel Marom, Univ. of Tel Aviv (Israel)
Sasa Kresic-Juric, Univ. of Split (Croatia)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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