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Hi Kevin, I was delighed to find your article while googling for spatial transformer network :)

Currently I am thinking of using Spatial Transformer to automatically locate the serial number region in a banknote. An example banknote and serial number region is attached below.

The ultimate goal is to train serial number recognition network. The input are raw banknote images, and the labels are serial number digit. The general idea is to use spatial transformer module to automatically locate the snr region, and then feed the cropped/warpped snr region to further cnn layers for recognition. Do you think spatial transformer network is capable of automatically locating such a small region in the image by sheer backpropogation?