Classification of wheat kernels infected with fungi of the genus Fusarium using discriminative classifiers and neural networks

Ewa Ropelewska1*
Fusarium head blight (FHB) compromises the processing suitability and nutritional value of grain, and it causes significant crop losses. The aim of the study was to develop models for the classification of wheat (Triticum aestivum L.) kernels infected with fungi and healthy wheat kernels. Wheat kernels were classified with the use of Decision Tree, Rule-based, Bayes, Lazy, Meta and Function classifiers, as well as multilayer perceptron (MLP), radial basis function (RBF) and probabilistic neural networks (PNN) Twenty textures were selected from RGB, Lab, XYZ colour spaces each, for every wheat variety and each kernel side. Accuracy ranged from 82% for the dorsal side of kernels for Naive Bayes and IBk classifiers to 100% for the ventral side of kernels for IBk, FLDA and Naive Bayes classifiers. Classification accuracy was highest in the model based on texture attributes from Lab colour space. The final model of 20 attributes from Lab colour space was applied to a set of kernels from all wheat varieties, analysed on the ventral side. The accuracy of the classification model ranged from 94% to 98%, depending on the applied classifier. The models developed with the use of neural networks were characterised by overall classification accuracy of above 99% for MLP networks, above 96% for RBF networks and above 97%forPNN. The developed models indicate that analyses should be performed on the ventral side of kernels based on textures from Lab colour space.
Keywords: Discrimination, fungal infection, neural networks, textures, Triticum aestivum, wheat kernels.
1University of Warmia and Mazury in Olsztyn, Faculty of Engineering, Department of Systems Engineering, Heweliusza 14, 10-718 Olsztyn, Poland. *Corresponding author (ewa.ropelewska@uwm.edu.pl).