Table 3 Overview of challenges during the preprocessing of finger images and proposed approaches
Challenge | Authors | Year | Approach |
|---|---|---|---|
Finger segmentation | Wang et al. [44] | 2017 | Hand color estimation in YCbCr |
Rotated pitched principal orientation estimation | Zaghetto et al. [45] | 2015 | Artificial neural network |
Low contrast | Wang et al. [46] | 2016 | CLAHE and extensions |
Distance to sensor, rigde-line frequency | Carney et al. [33] | 2017 | Frequency map, sensor-finger distance approximation |
Core/principle singular point detection | Labati et al. [47] | 2010 | Poincaré-based ridge orientation analysis |
Deformation correction | Lin et al. [48] | 2018 | Robust thin plate splines, deformation correction model |