17 May 2013 Apple ripeness detection using hyperspectral laser scatter imaging
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A hyperspectral laser scatter imaging (HLSI) system based on a supercontinuum laser in combination with a monochromator has been developed for contactless and non-destructive measuring the ripeness of Braeburn apples. Reflectance images were obtained by a CCD camera at 91 different wavelengths ranging from 550 nm to 1000 nm and transformed into reflectance profiles. A linear function was fitted to the logarithm (log10) of the extracted profiles, resulting in an intercept and a slope. These two parameters were then correlated with apple ripeness parameters such as firmness and soluble solids content (SSC) measured by the reference, destructive methods. Preliminary results showed the potential of slope and intercept to be used as a ripeness indicator. Moreover, during fruit ripening, the new HLSI measurement technique clearly showed the degradation of chlorophyll over time.
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Robbe Van Beers, Robbe Van Beers, Ben Aernouts, Ben Aernouts, Josse De Baerdemaeker, Josse De Baerdemaeker, Wouter Saeys, Wouter Saeys, "Apple ripeness detection using hyperspectral laser scatter imaging", Proc. SPIE 8881, Sensing Technologies for Biomaterial, Food, and Agriculture 2013, 88810K (17 May 2013); doi: 10.1117/12.2030569; https://doi.org/10.1117/12.2030569

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