Fig. 7From: Wireless multimedia sensor network for rape disease detectionsThe influence of expanded dataset. As shown in Fig. 7, this phenomenon is mainly due to the following reasons: (1) the extended datasets generated by various digital image processing techniques provide more opportunities for learning appropriate hierarchical features for models based on CNN; (2) the expansion of image diversity in image dataset is helpful to fully train the weight of learning in the model based on CNN, but the smaller image data set is lack of diversity and will lead to over-fitting problem; (3) the image preprocessing simulates the real collecting environment of apple pathological image, so the model based on CNN has better recognition ability to the natural apple pathological image obtained from apple orchard. The experimental results show that the extended data set can improve the generalization ability of the proposed modelBack to article page