“…The evaluation protocols are described in Section V-A. In the experiments on NTU-PI-v1 and NTU-CP-v1, the ROIs extracted by the pretrained ROI-LAnet (Section V-D) are input to CompCode [29], OrdinalCode [30], DOC [35], DoN [36], DSCN [39], SIFT-IRANSAC [25], MF-LBP [26], VGG-16 [57], ResNet-50 [66], GoogLeNet [67], PalmNet [22], PCANet [42], AlexNet-S [21], CR-CompCode [37], LLDP [33] and HOL [34] because their preprocessing steps cannot handle images in these two databases, which have complex backgrounds or no gaps between the fingers. In other words, if the proposed ROI-LAnet is not used to "help" other palmprint recognition methods to extract ROI, all of them would fail.…”