光谱学与光谱分析 |
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Improving Apple Fruit Quality Predictions by Effective Correction of Vis-NIR Laser Diffuse Reflecting Images |
QING Zhao-shen1,JI Bao-ping1*,SHI Bo-lin1,ZHU Da-zhou1,TU Zhen-hua1,ZUDE Manuela2 |
1. China Agricultural University, College of Food Science and Nutritional Engineering, Beijing 100083, China 2. Leibniz-Institute for Agricultural Engineering Potsdam-Bornim (ATB), 14469 Potsdam-Bornim, Germany |
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Abstract In the present study, improved laser-induced light backscattering imaging was studied regarding its potential for analyzing apple SSC and fruit flesh firmness. Images of the diffuse reflection of light on the fruit surface were obtained from Fuji apples using laser diodes emitting at five wavelength bands (680, 780, 880, 940 and 980 nm). Image processing algorithms were tested to correct for dissimilar equator and shape of fruit, and partial least squares (PLS) regression analysis was applied to calibrate on the fruit quality parameter. In comparison to the calibration based on corrected frequency with the models built by raw data, the former improved r from 0.78 to 0.80 and from 0.87 to 0.89 for predicting SSC and firmness, respectively. Comparing models based on mean value of intensities with results obtained by frequency of intensities, the latter gave higher performance for predicting Fuji SSC and firmness. Comparing calibration for predicting SSC based on the corrected frequency of intensities and the results obtained from raw data set, the former improved root mean of standard error of prediction (RMSEP) from 1.28° to 0.84°Brix. On the other hand, in comparison to models for analyzing flesh firmness built by means of corrected frequency of intensities with the calibrations based on raw data, the former gave the improvement in RMSEP from 8.23 to 6.17 N·cm-2.
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Received: 2007-01-19
Accepted: 2007-04-26
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Corresponding Authors:
JI Bao-ping
E-mail: jbp@cau.edu.cn
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