“…There are two choices for us to realise the target that is to discard the useless background information and let the input image comprise most of the foreground. One is the fingerprint segmentation or matting [15, 16], and the other is the image cropping. Even though both the ways above is effective to drop the useless information that the background provides, the traditional fingerprint segmentation such as OSTU algorithm does not fit the fingerprint images like Fig.…”