Quality criterion for digital still camera

Sergey Bezryadin

doi:10.1117/12.704524

20 February 2007 Quality criterion for digital still camera

Sergey Bezryadin

Proceedings Volume 6502, Digital Photography III; 65020M (2007) https://doi.org/10.1117/12.704524
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

The main quality requirements for a digital still camera are color capturing accuracy, low noise level, and quantum efficiency. Different consumers assign different priorities to the listed parameters, and camera designers need clearly formulated methods for their evaluation. While there are procedures providing noise level and quantum efficiency estimation, there are no effective means for color capturing accuracy estimation. Introduced in this paper criterion allows to fill this gap. Luther-Ives condition for correct color reproduction system became known in the beginning of the last century. However, since no detector system satisfies Luther-Ives condition, there are always stimuli that are distinctly different for an observer, but which detectors are unable to distinguish. To estimate conformity of a detector set with Luther-Ives condition and calculate a measure of discrepancy, an angle between detector sensor sensitivity and Cohen's Fundamental Color Space may be used. In this paper, the divergence angle is calculated for some typical CCD sensors and a demonstration provided on how this angle might be reduced with a corrective filter. In addition, it is shown that with a specific corrective filter Foveon sensors turn into a detector system with a good Luther-Ives condition compliance.

Citation Download Citation

Sergey Bezryadin "Quality criterion for digital still camera", Proc. SPIE 6502, Digital Photography III, 65020M (20 February 2007); https://doi.org/10.1117/12.704524

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KEYWORDS

Sensors

Optical filters

Fluorescence correlation spectroscopy

Cameras

Decision support systems

Digital cameras

CCD image sensors

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