COLOR IMAGING: DEVICE-INDEPENDENT COLOR, COLOR HARDCOPY, AND GRAPHIC ARTS

Colorimetric characterization of novel multiple-channel sensors for imaging and metrology

[+] Author Affiliations
Patrick G. Herzog

Aachen University of Technology, Technical Electronics Department, 52056?Aachen, Germany

Dietmar Knipp, Helmut Stiebig

Forschungszentrum Ju¨lich GmbH, Institute for Thin Film and Ion Technology, 52425?Ju¨lich, Germany

Friedhelm Ko¨nig

Aachen University of Technology, Technical Electronics Department, 52056?Aachen, Germany

J. Electron. Imaging. 8(4), 342-353 (Oct 01, 1999). doi:10.1117/1.482704
History: Received Mar. 3, 1999; Revised June 8, 1999; Accepted June 9, 1999
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Abstract

This paper describes a new type of multichannel color sensor with the special property of having all channels per pixel at the same spatial location. This arrangement is accomplished by stacking three amorphous thin film detectors on a substrate (glass or silicon), one on top of the other. It has the advantage that the color aliasing effect is avoided. This effect produces large color errors when objects of high spatial frequency are captured using multichannel imaging sensors with color filter arrays. The new technique enables the design of a three-channel sensor as well as a six-channel sensor, the latter being valuable even as a single-pixel device for metrology. In the six-channel case, color is captured in two “shots” by changing the bias voltages. The sensors are characterized colorimetrically, including methods such as multiple polynomial regression both for tristimulus and spectral reconstruction, and the smoothing inverse for spectral reconstruction. The results obtained with different types of regression polynomials, different sensors, and different characterization methods are compared. The results show that the new amorphous three-channel sensors perform comparably with commercial charge coupled device cameras under the conditions tested, while the six-channel’s performance is striking. © 1999 SPIE and IS&T.

© 1999 SPIE and IS&T

Citation

Patrick G. Herzog ; Dietmar Knipp ; Helmut Stiebig and Friedhelm Ko¨nig
"Colorimetric characterization of novel multiple-channel sensors for imaging and metrology", J. Electron. Imaging. 8(4), 342-353 (Oct 01, 1999). ; http://dx.doi.org/10.1117/1.482704


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