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Proceedings Paper

Geometrical and radiometrical signal transfer characteristics of a color CCD camera with 21-million pixels
Author(s): Reimar K. Lenz; Udo Lenz
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Paper Abstract

This article describes methods to quantify the signal transfer characteristics of CCD cameras. The Fresnel zone plate is a nearly ideal tool for the direct determination of the modulation transfer function and of chromatic aberrations of the optical system. It is used to measure the properties of the newly developed CCD camera ProgRes 3000 using piezo-controlled microscanning to digitize images with a variable resolution from 500 X 580 up to 3000 X 2320 picture elements for each of the three color channels red, green, and blue. The geometrical accuracy of the piezo positioners is measured with algorithms similar to correlation. Using special test patterns, a measurement accuracy of less than 1/1000 of the sensor element pitch is reached, whereas the positioning accuracy is about 1/100 of a sensor element. In order to fully exploit the radiometrical dynamic range of the sensor used within the ProgRes 3000, experiments have been performed with Peltier cooling and pixel- synchronous 12-bit analog to digital conversion. A dynamic range of 2500:1 is reached, sufficient for working in low-light level environments or for digitizing high-contrast color slides or x-ray images.

Paper Details

Date Published: 1 September 1991
PDF: 10 pages
Proc. SPIE 1526, Industrial Vision Metrology, (1 September 1991); doi: 10.1117/12.48242
Show Author Affiliations
Reimar K. Lenz, Technische Univ. Muenchen (Germany)
Udo Lenz, CCD Videometrie (Germany)


Published in SPIE Proceedings Vol. 1526:
Industrial Vision Metrology

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