Multi- or hyperspectral cameras permit rapid acquisition of images at many wavelengths. Imaging at fewer than ten wavelengths is generally termed multispectral, and more than ten termed hyperspectral. The resulting dataset can be visualized as a cube with the X and Y dimensions being the length and width of the image (in pixels) and the Z dimension being spectral wavelengths; each datapoint is an intensity value. Alternatively, the dataset could be envisioned as a stack of singlewavelength pictures of the object, with as many pictures as the number of wavelengths used. Such imaging provides information about the spatial distribution of constituents (pigments, sugars, moisture, etc.) near the product’s surface. Differences between sound and damaged tissues in visible and NIR diffuse reflectance are useful
for detecting bruises, chilling injury, scald, decay
lesions and numerous other defects. Bruises on
apples and peaches can be detected at specific
NIR wavelengths; however, the wavelengths chosen
for apple differ between fresh and aged
bruises because of drying of the injured tissues
Multi- or hyperspectral cameras permit rapid acquisition of images at many wavelengths. Imaging at fewer than ten wavelengths is generally termed multispectral, and more than ten termed hyperspectral. The resulting dataset can be visualized as a cube with the X and Y dimensions being the length and width of the image (in pixels) and the Z dimension being spectral wavelengths; each datapoint is an intensity value. Alternatively, the dataset could be envisioned as a stack of singlewavelength pictures of the object, with as many pictures as the number of wavelengths used. Such imaging provides information about the spatial distribution of constituents (pigments, sugars, moisture, etc.) near the product’s surface. Differences between sound and damaged tissues in visible and NIR diffuse reflectance are useful
for detecting bruises, chilling injury, scald, decay
lesions and numerous other defects. Bruises on
apples and peaches can be detected at specific
NIR wavelengths; however, the wavelengths chosen
for apple differ between fresh and aged
bruises because of drying of the injured tissues
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