16 September 1993 Dual magnification video microscope for machine vision
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Abstract
When machine vision utilizing pattern recognition for precise position measurement is used, special emphasis on spatial filtering, stability, and repeatability of the optical image is required. The opposing requirements of a large field of view, which provides for rapid searching, and a high magnification, which provides for higher accuracy, can be mutually exclusive when the image detector is a small CCD array with a finite pixel size. A video microscope for machine vision is described whose key design requirements were appropriate resolution, low cost, a given small space of predetermined shape, two fixed and precise magnifications to be achieved with given object-to-image distances, illumination evenness of 5% or better, and having both dark and bright field illumination.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John A. Penkethman, John A. Penkethman, Stephen R. Motta, Stephen R. Motta, } "Dual magnification video microscope for machine vision", Proc. SPIE 1998, Optomechanical Design, (16 September 1993); doi: 10.1117/12.156622; https://doi.org/10.1117/12.156622
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