Digital cameras: optical footprints in a performance metric

Lionel Baker

doi:10.1117/12.790891

25 September 2008 Digital cameras: optical footprints in a performance metric

Lionel Baker

Proceedings Volume 7102, Optical Fabrication, Testing, and Metrology III; 71020K (2008) https://doi.org/10.1117/12.790891
Event: Optical Systems Design, 2008, Glasgow, Scotland, United Kingdom

Abstract

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.

Citation Download Citation

Lionel Baker "Digital cameras: optical footprints in a performance metric", Proc. SPIE 7102, Optical Fabrication, Testing, and Metrology III, 71020K (25 September 2008); https://doi.org/10.1117/12.790891

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KEYWORDS

Cameras

Eye

Image quality

Digital cameras

Image quality standards

Modulation transfer functions

Visualization

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