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Detection of foreign bodies in food by thermal image processing

: Ginesu, G.; Giusto, D.D.; Märgner, V.; Meinlschmidt, P.


IEEE transactions on industrial electronics 51 (2004), Nr.2, S.480-490
ISSN: 0278-0046
ISSN: 0018-9421
ISSN: 0093-9994
Fraunhofer WKI ()
Nahrungsmittel-Untersuchung; Fremdkörpererkennung; Bildverarbeitung; zerstörungsfreie Prüfung; Thermographie; thermography; food-inspection; foreign body detection; non-destructive testing

This paper deals with the problem of detection of foreign bodies in food. A new method for inspecting food samples is presented, using thermographic images to detect foreign bodies that are not detectable using conventional methods. At first, the basic background of thermography is given. Then, experiments to obtain well-contrasted thermographic images of different food and foreign bodies are discussed. The main part of the present paper introduces specific Image processing methods that show a good recognition power of foreign bodies within food. Results achieved with a small set of test images are presented. The results are promising and the methods work even an some poorly contrasted images. To compare the different image processing and recognition methods, a quality index is defined. On the test Images the success of the presented methods is shown and the difference in recognition results can be measured using the introduced quality Index.