Therefore, we establish a network layer structure based Spatial Pyramid Pooling network (SPP-net). To achieve this goal, a fixed-length vector set is necessary for the classifiers or full connection layers. Our scheme attempts to learn multiscale high-level features, so as to capture detail spatial information. The scale of fingerprints images is various, due to different fingerprint acquisition devices different scale contains different detail information of the images. Sheng Wu, in Advances in Computers, 2021 3.2.2 The construction of SPP-net deep feature vector
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