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Proceedings Paper

Imaging photometer with a non-professional digital camera
Author(s): Karel Fliegel; Josef Havlin
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Paper Abstract

Expensive measuring equipments and to some extent also professional digital still cameras are capable to capture scenes with high accuracy in representation of colors and consequently luminance. On the contrary, low-end equipments are in most of the cases adjusted by the manufacturer to produce visually attractive images with weak interest to reach high fidelity, measurement device close, reproduction of colors. In this paper we present a simple way how to use a consumer level digital camera as a 2D luminance meter or imaging photometer. Our approach is based mostly on measurement of spectral response curves of photosensitive elements and evaluation of output response from the raw image data captured by the camera. Utilization of these characteristics leads to a better calibration of the camera as a luminance meter. The performance improvement while using the image calibration data of the image sensor and objective lens is verified. The potential utilization of a consumer level digital camera as a substitute for expensive measuring devices is discussed.

Paper Details

Date Published: 2 September 2009
PDF: 8 pages
Proc. SPIE 7443, Applications of Digital Image Processing XXXII, 74431Q (2 September 2009); doi: 10.1117/12.825977
Show Author Affiliations
Karel Fliegel, Czech Technical Univ. in Prague (Czech Republic)
Josef Havlin, Czech Technical Univ. in Prague (Czech Republic)

Published in SPIE Proceedings Vol. 7443:
Applications of Digital Image Processing XXXII
Andrew G. Tescher, Editor(s)

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