Using features extracted using a pretrained CNN as new features for an CNN/NN

I am extracting features from pictures using a pretrained CNN. Would it make sense to use those features as inputs for a new CNN/NN? Has it been done before?

Solution

This is called finetuning. It is very commonly used. Usually, one deletes the last few layers of a VGG or a similar network, adds layers which suit to the task and trains the network on the new data.

See:

https://github.com/vlfeat/matconvnet/issues/218
http://caffe.berkeleyvision.org/gathered/examples/finetune_flickr_style.html

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