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Proceedings Paper

Processing of low-intensity CCD images for temperature mapping in industrial processes
Author(s): Gerald Zauner; Daniel Heim; Kurt Niel; Guenther Hendorfer; Herbert Stoeri
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Paper Abstract

The temperature-mapping system presented is based on a grayscale CCD camera, rotating near infrared filters and an image processing software which is used for thermal imaging of heated metal parts in heat treatment processes (plasma nitriding). Due to relatively low process temperatures of about 300°C - 500°C the received light intensity of the glowing metal parts is very weak. The quality of these images can be improved by applying modern image processing filter methods. A precondition for a correct application of these denoising filters is an exact noise characterisation of the imaging system. A camera characterisation procedure based on the photon transfer technique and the system transfer function is presented. Based on these results, examples for density and intensity estimations of Poisson noise images with multiresolution methods (Platelets) are presented. The results are used to improve image quality and measurement accuracy of CCD based thermal images.

Paper Details

Date Published: 10 September 2004
PDF: 8 pages
Proc. SPIE 5457, Optical Metrology in Production Engineering, (10 September 2004); doi: 10.1117/12.545372
Show Author Affiliations
Gerald Zauner, Univ. of Applied Sciences of Upper Austria (Austria)
Daniel Heim, Univ. of Applied Sciences of Upper Austria (Austria)
Kurt Niel, Univ. of Applied Sciences of Upper Austria (Austria)
Guenther Hendorfer, Univ. of Applied Sciences of Upper Austria (Austria)
Herbert Stoeri, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 5457:
Optical Metrology in Production Engineering
Wolfgang Osten; Mitsuo Takeda, Editor(s)

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