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External quality grading of Jonagold apples using a multi-spectral vision system
Kleynen, Olivier; Leemans, Vincent; Destain, Marie-France
2003In Balsa-Canto E., Mora J.; Onate E. (Eds.) II International Workshop - Information Technologies and Computing Techniques for the Agro-Food Sector
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Keywords :
Apple; multi-spectral; machine vision; Bayes; sorting
Abstract :
[en] This paper presents a method to sort Jonagold apples using a four bands multi-spectral image acquisition device. Multi-spectral images of sound tissue and various defects were acquired. Defects could be divided into four classes: slight defects (e.g. small russet), more serious defects (scar tissue), defects leading to the rejection of the fruit (e.g. rot) and recent bruises (between one hour and two hours old). Image segmentation was based on the Bayes' theorem. Each pixel of the fruit was classified into 'healthy' or 'defect' classes according to the probability distribution of the spectral components of each class. Once segmented, the fruit was graded by linear discriminant analysis on the basis of the relative area of the defect and statistical parameters computed on the spectral components of the two tissues classes. Results (cross validation) showed 94% and 84% if the sound and defective fruits respectively well classified. Most of the misclassified defective fruits (89%) belonged to the slight defect category.
Disciplines :
Agriculture & agronomy
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Kleynen, Olivier
Leemans, Vincent ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Mécanique et construction
Destain, Marie-France ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Mécanique et construction
Language :
English
Title :
External quality grading of Jonagold apples using a multi-spectral vision system
Publication date :
2003
Event name :
2ème International Workshop - Information Technologies and Computing Techniques for the Agro-Food Sector
Event organizer :
International Center for numerical methods in Engineering
Event place :
Barcelona, Spain
Event date :
Novembre 2003
Audience :
International
Main work title :
II International Workshop - Information Technologies and Computing Techniques for the Agro-Food Sector
Editor :
Balsa-Canto E., Mora J.
Onate E.
Publisher :
International Center for numerical methods in Engineering, Barcelona, Spain
Pages :
63-66
Peer reviewed :
Peer reviewed
Funders :
DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE]
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