The VGG-16 model


The VGG model stands for the Visual Geometry Group from Oxford. The model was very simple and had a greater depth than AlexNet. The paper had two models with 16 and 19 layers depth. All the CNN layers were using 3 by 3 filters with stride and a pad of size 1 and a max pooling size of 2 with stride 2.  This resulted in a decrease in the number of parameters. Though the size is decreasing because of max pooling, the number of filters is increasing with layers. The architecture of the 16-layer deep model is as follows:

This model has 138 million parameters and is the largest of all the models described here. But the uniformity of parameters is quite good. The characteristic is such that, as deep as the network gets, the smaller the image is with an increased number of filters. One of the data augmentation techniques used was scale jittering. Scale jittering is an augmentation technique where a side with random size is considered to vary the scales. 

Model based design in Simulink

The DenseNet model



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