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Proceedings Paper

Sensor spectral sensitivities, noise measurements, and color sensitivity
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Paper Abstract

This article proposes new measurements for evaluating the image quality of a camera, particularly on the reproduction of colors. The concept of gamut is usually a topic of interest, but it is much more adapted to output devices than to capture devices (sensors). Moreover, it does not take other important characteristics of the camera into account, such as noise. On the contrary, color sensitivity is a global measurement relating the raw noise with the spectral sensitivities of the sensor. It provides an easy ranking of cameras. To have an in depth analysis of noise vs. color rendering, a concept of Gamut SNR is introduced, describing the set of colors achievable for a given SNR (Signal to Noise Ratio). This representation provides a convenient visualization of what part of the gamut is most affected by noise and can be useful for camera tuning as well.

Paper Details

Date Published: 3 March 2008
PDF: 11 pages
Proc. SPIE 6817, Digital Photography IV, 68170T (3 March 2008);
Show Author Affiliations
Frédéric Cao, DxO Labs. (France)
Frédéric Guichard, DxO Labs. (France)
Hervé Hornung, DxO Labs. (France)

Published in SPIE Proceedings Vol. 6817:
Digital Photography IV
Jeffrey M. DiCarlo; Brian G. Rodricks, Editor(s)

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