16 September 1993 Dual magnification video microscope for machine vision
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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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