Quality evaluation of pickling cucumbers using hyperspectral reflectance and transmittance imaging: Part I. Development of a prototype |
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Authors: | Diwan P Ariana Renfu Lu |
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Affiliation: | (1) Sugarbeet and Bean Research Unit, USDA Agricultural Research Service, Michigan State University, 224 Farrall Hall, East Lansing, MI 48824, USA |
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Abstract: | This article reports on the development of a hyperspectral imaging prototype for online evaluation of external and internal
quality of pickling cucumbers. The prototype consisted of a two-lane round belt conveyor, two illumination sources (one for
reflectance and one for transmittance), and a hyperspectral imaging unit. It had a novel feature of simultaneous imaging under
reflectance mode in the visible region (400–675 nm) and transmittance mode for the red and near-infrared region (Red-NIR)
(675–1000 nm). Reflectance information from the visible region was intended for evaluating the external characteristics of
cucumbers such as skin color, whereas transmittance information from Red-NIR was used for internal defect detection (i.e.,
hollow center). Additional features of the prototype included simultaneous acquisition of reflectance and transmittance from
calibration references that were installed in the system, to provide real-time, continuous corrections of individual hyperspectral
images from each sample. Methods and algorithms were developed of estimating cucumber fruit size and correcting the effect
of fruit size on transmittance measurements. The system was calibrated and evaluated for detecting the color, size, and internal
defect of pickling cucumbers. |
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Keywords: | Grading Hyperspectral imaging Pickling cucumbers External quality Internal quality Defect detection |
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