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Proceedings Paper

Measuring the spectral response with a set of interference filters
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Paper Abstract

To measure the spectral response of digital cameras is usually a time-consuming and expensive task. One method to gain the spectral response data is the use of reflectance charts and estimation algorithms. To improve the quality of the measurement narrow-band light is necessary. Usually an expensive and complicated monochromator is used to generate the narrow-band light. This paper proposes the use of a set of narrow-band interference filters as an alternative to a monochromator. It describes the measurement setup and data processing. A detailed quality assessment of the measurement data shows, that the quality is comparable to a measurement with a monochromator. The interference filter equipment is more affordable, easier to use and faster. The characterization of one device takes less than 10 minutes. The pros and cons compared to other methods are also discussed. The setup consists of a set of 39 narrow-band interference filters, which are photographed one after another. A modified slide projector is used for illumination. Software was developed to read the camera's response to the filter and process the data.

Paper Details

Date Published: 19 January 2009
PDF: 10 pages
Proc. SPIE 7250, Digital Photography V, 72500S (19 January 2009);
Show Author Affiliations
Christian Mauer, Image Engineering Dietmar Wüller (Germany)
Dietmar Wueller, Image Engineering Dietmar Wüller (Germany)

Published in SPIE Proceedings Vol. 7250:
Digital Photography V
Brian G. Rodricks; Sabine E. Süsstrunk, Editor(s)

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