25 September 2008 Digital cameras: optical footprints in a performance metric
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Conventional methods for objective measurement of the performance of image forming systems are reviewed. Due to the present widespread use of digital cameras, coupled with little data available on their actual performance, an alternative simpler approach for their comparative assessment has been studied. Camera performance, in this resolution-type test, requires measurement of a 'camera footprint' in relation to that of the 'visual footprint' of a standard eye. The metric,termed 'Optimum Print Width' (OPW) is defined as the width of print that can be made, when viewed at arm's length, where the effective size of the pixels in the camera are matched to the effective size of the cones in one's eye. The data are independent of magnification and take into account the number and size of spatially effective pixels, lens performance, image processing and, if needed, even the visual correction of the user. Performance data, collected from members of a camera-testing group, using several makes of camera are summarized.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lionel Baker, Lionel Baker, "Digital cameras: optical footprints in a performance metric", Proc. SPIE 7102, Optical Fabrication, Testing, and Metrology III, 71020K (25 September 2008); doi: 10.1117/12.790891; https://doi.org/10.1117/12.790891


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