  Finger vein image recognition technology plays an important role in biometric
recognition and has been successfully applied in many fields. Because veins are
buried beneath the skin tissue, finger vein image recognition has an
unparalleled advantage, which is not easily disturbed by external factors. This
review summarizes 46 papers about deep learning for finger vein image
recognition from 2017 to 2021. These papers are summarized according to the
tasks of deep neural networks. Besides, we present the challenges and potential
development directions of finger vein image recognition.
