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פותח על ידי קלירמאש פתרונות בע"מ -
Nonlinear methods for estimation of maturity stage, total chlorophyll, and carotenoid content in intact bell peppers
Year:
2013
Source of publication :
Biosystems Engineering
Authors :
אגוזי, חיים
;
.
איגנת, תימאה
;
.
ברנשטיין, נירית
;
.
הופמן, אהרון
;
.
שמילוביץ', זאב
;
.
Volume :
114
Co-Authors:
Ignat, T., Department of Physics-Control, Corvinus University of Budapest, Somlói 14-16, Budapest 1118, Hungary, Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Schmilovitch, Z., Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Feföldi, J., Department of Physics-Control, Corvinus University of Budapest, Somlói 14-16, Budapest 1118, Hungary
Bernstein, N., Institute of Soil, Water and Environmental Sciences, ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Steiner, B., Department of Physics-Control, Corvinus University of Budapest, Somlói 14-16, Budapest 1118, Hungary
Egozi, H., Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Hoffman, A., Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
414
To page:
425
(
Total pages:
12
)
Abstract:
The objective of the present study was to develop a fast, non-destructive method to measure the bell pepper chlorophyll content, which is one of the major maturity indices for determining harvesting time. The research is based on visibleenear-infrared (VISeNIR) and short-wave infrared (SWIR) spectrometry. Red, green and yellow varieties were examined: 'Celica', 'Ever Green' and 'No.117', respectively. Peppers were marked at the flowering stage, and 20 samples of each variety were collected weekly during nine weeks until full growth. Disc samples of the fruit flesh were analysed destructively, the spectrometry data were analysed chemometrically, and a nonlinear-kernel algorithm was developed for spectral data analysis. Comparisons were made between the linear and nonlinear regression analyses of the raw reflectance spectra (R), on one hand, and the preprocessed spectra such as the first derivative of R (D1R), log(1/R), D1(log(1/R)) and D2(log(1/R)), on the other hand. For further evaluation of the regression models a standardised weighted sum (SWS) index was developed, based on criterion weighting. The developed kernel algorithm, partial least squares (PLSR), and support vector machine (SVM) regression models were able to predict total chlorophyll and carotenoid contents for all three tested bell pepper cultivars, with average cross-validation errors of 0.007 and 0.01 mg g-1, respectively. The kernel nonlinear analysis of the spectral data yielded the most promising regression models for all three cultivars. © 2012 IAgrE.
Note:
Related Files :
Algorithms
Bells
chlorophyll
Reflectance spectrum
regression analysis
Spectrometry
Total chlorophyll and carotenoid contents
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.biosystemseng.2012.10.001
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26847
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:25
Scientific Publication
Nonlinear methods for estimation of maturity stage, total chlorophyll, and carotenoid content in intact bell peppers
114
Ignat, T., Department of Physics-Control, Corvinus University of Budapest, Somlói 14-16, Budapest 1118, Hungary, Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Schmilovitch, Z., Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Feföldi, J., Department of Physics-Control, Corvinus University of Budapest, Somlói 14-16, Budapest 1118, Hungary
Bernstein, N., Institute of Soil, Water and Environmental Sciences, ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Steiner, B., Department of Physics-Control, Corvinus University of Budapest, Somlói 14-16, Budapest 1118, Hungary
Egozi, H., Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Hoffman, A., Institute of Agricultural Engineering ARO, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Nonlinear methods for estimation of maturity stage, total chlorophyll, and carotenoid content in intact bell peppers
The objective of the present study was to develop a fast, non-destructive method to measure the bell pepper chlorophyll content, which is one of the major maturity indices for determining harvesting time. The research is based on visibleenear-infrared (VISeNIR) and short-wave infrared (SWIR) spectrometry. Red, green and yellow varieties were examined: 'Celica', 'Ever Green' and 'No.117', respectively. Peppers were marked at the flowering stage, and 20 samples of each variety were collected weekly during nine weeks until full growth. Disc samples of the fruit flesh were analysed destructively, the spectrometry data were analysed chemometrically, and a nonlinear-kernel algorithm was developed for spectral data analysis. Comparisons were made between the linear and nonlinear regression analyses of the raw reflectance spectra (R), on one hand, and the preprocessed spectra such as the first derivative of R (D1R), log(1/R), D1(log(1/R)) and D2(log(1/R)), on the other hand. For further evaluation of the regression models a standardised weighted sum (SWS) index was developed, based on criterion weighting. The developed kernel algorithm, partial least squares (PLSR), and support vector machine (SVM) regression models were able to predict total chlorophyll and carotenoid contents for all three tested bell pepper cultivars, with average cross-validation errors of 0.007 and 0.01 mg g-1, respectively. The kernel nonlinear analysis of the spectral data yielded the most promising regression models for all three cultivars. © 2012 IAgrE.
Scientific Publication
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