Co-Authors:
Geoola, F., Institute of Agricultural Engineering, ARO, The Volcani Center, PO Box 6, Bet Dagan, 50250, Israel
Peiper, U.M., Institute of Agricultural Engineering, ARO, The Volcani Center, PO Box 6, Bet Dagan, 50250, Israel
Abstract:
The object was to develop a rapid spectrophotometric procedure for detection of bruised areas on “Golden Delicious” apples which can be adapted for use in an automatic sensing device. Spectra of diffuse reflectance in the wavelength band of 400 to 840 nm were studied for 300 bruised and unbruised refrigerated apples. Statistical analysis of the reflectance spectra led to the development of a classifying function in the range of 750 to 80 nm for bruise detection purposes. The validity, reliability and generality of the developed classifying function and selected wavebands were examined by classifying 300 refrigerated apples of which 100 were unbruised, 100 bruised and left at room temperature for 90 min, and 100 bruised and left at room temperature for 24 h. Correct classifications were made for 96·1%, 88·4% and 93·7% of apples that were unbruised, bruised and left for 90 min and bruised and left for 24 h, respectively. Similar experiments were conducted on 200 non-refrigerated apples; the classification performances were 92·9% and 91·8% for unbruised, and bruised and left for 24 h, respectively. © 1994 Silsoe Research Institute.
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