@article{Girod:256469,
      recid = {256469},
      author = {Girod, D. and Landry, J. A. and Doyon, G. and  Osuna-Garcia, J. A. and Salazar-Garcia, S. and Geonaga, R.},
      title = {Evaluating Hass Avocado Maturity Using Hyperspectral  Imaging.},
      address = {2008-07-13},
      number = {1875-2017-355},
      pages = {12},
      year = {2008},
      abstract = {The maturity of avocado fruit is usually assessed by  measuring its dry matter content (DM), which is a  destructive and time consuming process. The aim of this  study is to introduce a non-destructive and quick technique  that can estimate the DM content of an avocado fruit.  'Hass' avocado fruits at different maturity stages and  varying skin color were analyzed by hyperspectral imaging  in reflectance and absorbance modes. The DM ranged from  19.8% to 42.5%. The hyperspectral data consist of mean  spectra of avocados in the VIS/NIR region, from 400nm to  lOOOnm, for a total of 163 different spectral bands.  Relationship between spectral wavelengths and DM content  were carried out using a chemometric partial least squares  (PLS) regression technique. Calibration and validation  statistics, such as correlation coefficient (R2) and  prediction error (RMSEP) were used as means of comparing  the predictive accuracies of the different models. The  results of PLS modeling, over several different  randomizations of the database, with full cross validation  methods using the entire spectral range, resulted in a mean  R2 of 0.86 with a mean RMSEP of 2.45 in reflectance mode,  and a mean R2 of 0.94 with a mean RMSEP of 1.59 for the  absorbance mode. This indicates that reasonably accurate  models (R2>0.8) could be obtained for DM content with the  entire spectral range. Also this study shows that  wavelengths reduction can be applied to the problem.  Starting with 163 spectral bands, the DM could be predicted  with identical performances using 10% of the initial  wavelengths (16 spectral bands). Thus the study  demonstrates the feasibility of using VIS/NIR hyperspectral  imaging in absorbance mode in order to determine a  physicochemical property, namely DM, of 'Hass' avocados in  a non-destructive way. Furthermore it gives some clues  about which spectral bands could be useful for that  purpose.},
      url = {http://ageconsearch.umn.edu/record/256469},
      doi = {https://doi.org/10.22004/ag.econ.256469},
}