An Electro-Optical System For Inspection Of Glass Bottles Using Adaptive Spatial Filtering

K. M. Johnson; R. Cormack; W. T. Cathey; F. Dolder

doi:10.1117/12.939976

21 August 1987 An Electro-Optical System For Inspection Of Glass Bottles Using Adaptive Spatial Filtering

K. M. Johnson, R. Cormack, W. T. Cathey, F. Dolder

Proceedings Volume 0754, Optical and Digital Pattern Recognition; (1987) https://doi.org/10.1117/12.939976
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

Defects in glassware known as "stuck glass" are caused by flying glass particles falling into red hot bottles during their manufacture. We describe the design, construction, and results of a prototype electro-optical inspection machine which detects sub-millimeter defects in glass bottles. This system uses pattern processing and spatial filtering in the Fourier domain to optically subtract the signature of the nondefec-tive part of the bottle, from the total image of the bottle. The huge variation in acceptable glass bottles, even within a particular sized bottle, requires a unique spatial filter for each bottle being inspected. We use a two-dimensional spatial light modulator to create such an adaptive spatial filter which allows us to compensate for these variations in real-time.

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K. M. Johnson, R. Cormack, W. T. Cathey, and F. Dolder "An Electro-Optical System For Inspection Of Glass Bottles Using Adaptive Spatial Filtering", Proc. SPIE 0754, Optical and Digital Pattern Recognition, (21 August 1987); https://doi.org/10.1117/12.939976

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KEYWORDS

Glasses

Image filtering

Inspection

Spatial filters

Optical filters

Diffraction

Bandpass filters

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