Imaging photometer with a non-professional digital camera

Karel Fliegel; Josef Havlin

doi:10.1117/12.825977

2 September 2009 Imaging photometer with a non-professional digital camera

Karel Fliegel, Josef Havlin

Proceedings Volume 7443, Applications of Digital Image Processing XXXII; 74431Q (2009) https://doi.org/10.1117/12.825977
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

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.

Citation Download Citation

Karel Fliegel and Josef Havlin "Imaging photometer with a non-professional digital camera", Proc. SPIE 7443, Applications of Digital Image Processing XXXII, 74431Q (2 September 2009); https://doi.org/10.1117/12.825977

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