Fig. 1. Infrared and visible face image registration process based on feature maps

Fig. 2. Diagrams of face silhouette feature extraction based on IDSC. (a) Bellman-Ford shortest path graph built using face silhouette landmark points; (b) four marked points; (c) their IDSC feature histograms

Fig. 3. Student's T distribution for various degrees of freedom

Fig. 4. Flow chart of proposed registration algorithm

Fig. 5. Registration results on synthetic Chinese character point sets. (a)-(c) Point sets before registration; (d)-(f) registration results of proposed algorithm; (g)-(i) recall curves of three registration algorithms

Fig. 6. Visible and infrared face registration results in UTK-IRIS database. (a)(b) Original visible and infrared images; (c) face edge maps; (d)(e) checkerboards of warping visible image into and infrared image

Fig. 7. Quantitative result comparison of multispectral face image pairs of different individuals. (a) Charles; (b) Heo; (c) Gribok; (d) Sharon

Fig. 8. Visible and infrared face image registration and fusion results captured by ourselves. (a) Original visible images; (b) original infrared images; (c) checkerboard images; (d) fusion images