Article (Scientific journals)
Selection of the most efficient wavelength bands for 'Jonagold' apple sorting
Kleynen, O.; Leemans, Vincent; Destain, Marie-France
2003In Postharvest Biology and Technology, 30 (3), p. 221-232
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Keywords :
apple defects; recent bruises; bicolour fruit; wavelength selection; spectrometer
Abstract :
[en] This paper presents a method based on quadratic discriminant analysis to select the best filters for detecting a wide range of defects in 'Jonagold' apple fruit using a multi-spectral vision system. Reflectance spectra of damaged and sound tissue were recorded using a visible/NIR spectrometer. Analysed defects consisted of scald, hail damage (with and without skin perforation), limb rubs, russets, scab tissue, frost damage, rot, visible flesh damage and recent bruises. Camera filter effects were approximated by summing the reflectances of all the wavelengths within the filter bandwidth. Combinations of three and four filters were tested and evaluated for discriminating damaged tissues from healthy ones. If a three-filter combination appeared sufficient to detect most of the damaged tissue, a four-filter combination should be considered for the complete sorting automation of this bicolour apple variety. A fourth filter was necessary to quantify the ratio between the blush and ground colours. Regarding recent bruise defects which represented the major difficulty, an image segmentation algorithm based on local contrast variations can enhance their detection. (C) 2003 Elsevier B.V. All rights reserved.
Disciplines :
Food science
Agriculture & agronomy
Author, co-author :
Kleynen, O.
Leemans, Vincent ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Destain, Marie-France ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Language :
English
Title :
Selection of the most efficient wavelength bands for 'Jonagold' apple sorting
Publication date :
2003
Journal title :
Postharvest Biology and Technology
ISSN :
0925-5214
eISSN :
1873-2356
Publisher :
Elsevier Science
Volume :
30
Issue :
3
Pages :
221-232
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 November 2009

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