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186   Chapter 6 Plant leaf disease classification based on feature selection






                                                     Table 6.10 Confusion matrix of MLP.


                                           Class        C1         C2         C3        C4
                                           C1           34          0         0         1
                                           C2            7         13         0         0
                                           C3            2          0         18        2
                                           C4            3          0         1         4
                                           MLP, multilayer perceptron.





                                              Table 6.11 Performance comparison of CNN models.


                                                   Without transfer learning  With transfer learning
                                                   Training  Validation  Training  Validation
                                           Models accuracy   accuracy   accuracy   accuracy
                                           AlexNet  74.3%    66%        85.6%      78.8%
                                           VGG16   78%       76%        84.5%      77.6%
                                           ResNet-18 84%     68%        90.6%      80%
                                           ResNet-50 63.5%   67.1%      85.4%      84.7%
                                           CNN, convolutional neural network.





                                    of images before processing by the deep neural network. Trans-
                                    ferlearningfromother similarfeaturesdataset is also per-
                                    formed to train the deep residual neural network, which gives
                                    advantages in the learning process. The proposed method
                                    achieves a best accuracy of 84.7%, which is higher than that of
                                    other pretrained models. Also, we proposed a simpler MLP
                                    framework but has competitive results. In future work, this pre-
                                    sented method will be improved by increasing the number of
                                    images in data set and optimizing parameters of the deep neural
                                    network model.
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