VERIFICATION OF LIGHT-SOURCE UNIFORMITY IN A PORTABLE SETUP FOR DIGITAL CAMERA CHARACTERIZATION

Édilla M. Gonçalves Fernandes, Henrique C. de Campos Glória, Davies W. de Lima Monteiro, Luiz F. Etrusco Moreira

Abstract

This work presents a flexible, low-cost and portable setup that allows the characterization of digital cameras based on the EMVA 1288 standard. Instead of using expensive equipment as an integrating sphere, we propose a properly evaluated simple light source based on a translucent glass surface. To make this possible it is necessary to understand the uniformity aspects of this surface and to map its interference by means of a characterization procedure. The method proposed basically subtracts the non- uniformity map of the original light source allowing its use as a flat field surface.<br />An optical setup was developed to extract data for the uniformity verification. It is basically composed by a digital camera, a frosted-surface light source, an extension tube and a translation stage. Some preliminary results are presented showing the validity of this approach.

Keywords

EMVA1288, standardization, translucent surface, uniformity, homogeneity, characterization, digital cameras, flat-field luminance

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IMEKO-TC4-2011-013.pdf

DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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