关键词: 高光谱图像, 反射, 半透射, 水蜜桃, 冷害 , 检测

Abstract:

Hyperspectral imaging technique was investigated for the detection of chilling injury in ‘Xiahui 5’ honey
peach during the early postharvest storage period. Extractable juice content was measured during the storage to find
the time point of occurrance of early chilling injury. Then, hyperspectral reflectance and half-transmission images over
the wavelength range of 400–1 000 nm were captured, and independent components analysis (ICA) was implemented
on both modes of pictures, respectively. The optimal wavelengths selected by ICA were 656, 674 and 704 nm for
reflectance mode, and 640, 745 and 811 nm for half transmittance mode, respectively. Further, spectral average of
each characteristic band was chosen as the input of the Fisher discrimination model, an average prediction accuracy of
83.0% and 94.0% for each mode to distinguish between normal and early injured peach were achieved. This research
has demonstrated that the hyperspectral imaging technique is feasible for the detection of chilled peach at the early
period, and half transmittance mode has a better performance.

Key words: hyperspectral imaging, reflectance, half-transmittance, honey peach, chilling injury, detection