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A Weed Species Spectral Detector Based on Neural Networks

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Abstract

A new neural network architecture for classification purposes is proposed. The Self-Organizing Map (SOM) neural network is used in a supervised way for a classification task. The neurons of the SOM become associated with local linear mappings (LLM). Error information obtained during training is used in a novel learning algorithm to train the classifier. The proposed method achieves fast convergence and good generalization. The classification method is then applied in a precision farming application, the classification of crops and different kinds of weeds by using spectral reflectance measurements. The classification performance of the proposed method is proven superior compared to other neural classifiers. Also, the proposed method compares favorably with the results obtained by using an optimal Bayesian classifier.

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References

  • Bennet K. A. and Brown, R. B. 1997. Direct nozzle injection and precise metering for variable rate herbicide application, Paper No. 97–1046 (American Society of Agricultural Engineers, St. Joseph, MI, USA).

    Google Scholar 

  • Biller, R. H. 1998. Reduced input of herbicides by use of optoelectronic sensors. Journal of Agricultural Engineering Research 71, 357–362.

    Google Scholar 

  • Bishop, C. M. 1995. Neural Networks for Pattern Recognition (Oxford University Press, Oxford, U.K.).

    Google Scholar 

  • Chancellor, W. J. and Goronea, M. A. 1993. Spatial variability of nitrogen, moisture and weeds, Paper No. 93–1069 (American Society of Agricultural Engineers, St. Joseph, MI, USA).

    Google Scholar 

  • Dietterich, T. G. 1997. Approximate statistical tests for comparing supervised classification learning algorithms. Neural Computation 10(7), 1895–1924

    Google Scholar 

  • Efron, B. and Gong, G. 1983. A leisurely look at the bootstrap, the jacknife and cross-validation. The American Statistician 37(1), 36–48.

    Google Scholar 

  • Everitt, B. S. 1977. The Analysis of Contingency Tables (Chapman and Hall, London).

    Google Scholar 

  • Gausman, H. W. 1985. Plant leaf optical properties in visible and near-infrared light, Dissertation (Texas Tech University, 78 pp., Lubbock, Texas, USA).

  • Grant, L. 1987. Diffuse and specular characteristics of leaf reflectance. Remote Sensing of the Environment 22, 309–322.

    Google Scholar 

  • Hahn, F. and Muir, A. Y. 1993. Weed-Crop discrimination by optical reflectance. In: Proceedings of IV International Symposium on Fruit, Nut, and Vegetable Production Engineering, edited by F. Juste (Ministerio de Agriculture, Pesca y Alimentación & INIA, Valencia, Spain), vol. 1, p. 221–228.

    Google Scholar 

  • Herrala, E., Okkonen, J., Hyvarinen, T., Aikio M. and Lammasniemi, J. 1994. Imaging spectrometer for process industry applications. SPIE 2248, 33–40.

    Google Scholar 

  • Kohonen, T. 1982. Self-organized formation of topologically correct feature maps. Biological Cybernetics 43, 59–69.

    Google Scholar 

  • Kohonen, T. 1995. Self-Organizing Maps, Springer Series in Information Sciences (Springer Verlag Berlin-Heidelberg).

  • Miller, P. C. H. and Stafford, J. V. 1991. Herbicide application to targetted patches. In: Brighton Crop Protection Conference—Weeds—1991 (British Crop Protection Council, Brighton), vol. 3, p. 1249–1256.

    Google Scholar 

  • Moshou, D., De Ketelaere, B., Vrindts, E., De Baerdemaeker, J. and Ramon, H. 1998. Local linear mapping neural networks for pattern recognition of plants. In: Proceedings of First IFAC/CAEA, International Workshop on Control Applications and Ergonomics in Agriculture, June 4–6 1998 (Athens, Greece) p. 61–66.

  • Niles, L., Silverman, H., Tajchman, G. and Bush, M. 1989. How limited training data can allow a neural network to outperform an 'optimal' statistical classifier. In: Proceedings of International Conference on Acoustics, Speech, and Signal Processing '89 (editor IEEE, New York) p. 17–20.

    Google Scholar 

  • Ritter, H., Martinetz, T. and Schulten, K. 1992. Neural Computation and Self-Organizing Maps: An Introduction (Addison-Wesley, New York).

    Google Scholar 

  • Rosenblatt, M. 1956. Remarks on some nonparametric estimates of a density function. Annals of Mathematical Statistics 27, 832–837.

    Google Scholar 

  • Rumelhart, D. E., Hinton, G. E. and Williams, R. J. 1986. Parallel Distributed Processing (MIT Press, Cambridge, USA), vol. 1, p. 318–362.

    Google Scholar 

  • Specht, D. F. 1990. Probabilistic neural networks. Neural Networks 3(1), 109–118.

    Google Scholar 

  • Stafford, J. V. and Benlloch, J. V. 1997. Machine-assisted detection of weeds and weed patches. In: Precision Agriculture '97, Proceedings of the First European Conference on Precision Agriculture, edited by J. V. Stafford (Bios Scientific Publishers, Oxford, UK), p. 511–518.

    Google Scholar 

  • Vrindts, E. and De Baerdemaeker, J. 1997. Optical discrimination of crop, weed and soil for on-line weed detection. In: Proceedings of the First European Conference on Precision Agriculture, edited by J. Stafford (BIOS Scientific Publishers, Oxford, UK), p. 537–544.

    Google Scholar 

  • Vrindts, E. and De Baerdemaeker, J. 1999. Optical weed detection and evaluation using reflection measurements. In: Precision Agriculture and Biological—Quality. Proceedings of SPIE, vol. 3543; 3–4 Nov. 1998, Boston, USA edited by G. E. Meyer and J. A. DeShazer (Bellingham, Washington, USA), p. 279–289.

    Google Scholar 

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Moshou, D., Ramon, H. & De Baerdemaeker, J. A Weed Species Spectral Detector Based on Neural Networks. Precision Agriculture 3, 209–223 (2002). https://doi.org/10.1023/A:1015590520873

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