Resize and cropsize differences

[John Wilson]

Sorry for my novice questions... can someone shed light on this: in most network definitions prototxt files (like this),  I see crop_size to be 227 and new_width & new_height to be 256. Why not just specify a resize of the width and height to be 227 directly? Or is the 227 size used for doing the 10 crops automatically? Thank you.

[John Wilson]

My appologies again for the basic question, I'm just learning the ropes - if anyone can point me in the right direction here, much appreciated! Thank you.

[Jonathan L Long]

Look around https://github.com/BVLC/caffe/blob/master/src/caffe/layers/data_layer.cpp#L63 (in master; this has moved in dev).

The data layers first resize to 256 x 256, then take _random_ crops of size 227 x 227 (when training, as a form of data augmentation) or just the center crop (when testing).

JLL

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