Analysis of speckle noise in bar-code scanning systems

Emanuel Marom*, Saša Krešic-Jurić, Leonard Bergstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Laser beams used for bar-code scanning exhibit speckle noise generated by the roughness of the surface on which bar codes are printed. Statistical properties of a photodetector signal that integrates a time-varying speckle pattern falling on its aperture are analyzed in detail. We derive simple closed-form expressions for the autocorrelation function and the power spectral density of the detector current for scanning beams with arbitrary field distributions. Theoretical calculations are illustrated by numerical simulations as well.

Original languageEnglish
Pages (from-to)888-901
Number of pages14
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number4
StatePublished - Apr 2001
Externally publishedYes


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