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A double image acquisition system with visible and UV LEDs for citrus fruit

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Food Processing Automation Conference Proceedings, 28-29 June 2008, Providence, Rhode Island  701P0508cd.(doi:10.13031/2013.24554)
Authors:   Naoshi Kondo, Takahisa Nishizu, Yoshihid Minami, Peter Ling, Mitsutaka Kurita, Makoto Kuramoto, Paolo Demetrio Falzea, Yuichi Ogawa
Keywords:   Fluorescence, Machine vision, Fruit grading, Post harvest, Fruit quality, Fruit rot, Image acquisition

There are many types of citrus fruit grading machine with machine vision capability. While most of them sort fruit by size, shape, and color, detection of rotten fruit remains challenging because their appearances are similar to normal parts. Objectives of this research were to investigate if fluorescence would be a good indicator of the fruit rot, and to develop an economical solution to add the rot inspection capability to an existing machine vision fruit inspection station. A machine vision system consisting of a pair of white and ultra violet (UV) LED lighting devices and a color CCD camera was proposed for the citrus fruit grading task. Since the time lag between the color and fluorescence image captures was short (14ms), it was possible to inspect color, shape, size, and rot of a fruit on the move before it leaves an existing industrial inspection chamber.

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