Mr. Christian Mauer Profile

Christian Mauer

at Image Engineering GmbH & Co KG

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Proceedings Article | 19 January 2009 Paper

Measuring the spectral response with a set of interference filters

Christian Mauer, Dietmar Wueller

Proceedings Volume 7250, 72500S (2009) https://doi.org/10.1117/12.805591

KEYWORDS: Cameras, Interference filters, Optical filters, Optical filtering, Projection systems, RGB color model, Digital cameras, Monochromators, Lamps, Data processing

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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.

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