Analysis of Hyperspectral Images of Citrus Fruits

Publisher Summary Some of the most important aspects that need to be taken into consideration when developing a hyperspectral inspection system for citrus include the geometry of the fruit, the emission spectrum of the lighting source, and their interaction. Because many citrus fruits are almost spherical, each point of their surface reflects the electromagnetic radiation differently toward the camera. This causes a gradual darkening of the image especially the further pixels from the light source, which is a phenomenon that must be artificially corrected. In addition, the variation of the efficiency of the filters with the wavelength should be also taken into consideration to enable the appropriate corrections to obtain true reflectance images. Hyperspectral systems are an important tool for the quality inspection of citrus fruits, offering the possibility of designing machines for the automatic identification of blemishes. This is particularly important for early rot detection, one of the major problems faced by this sector. However, a realistic implementation of such systems probably still requires an important effort in adequately reducing the number of input bands.

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