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