Fig. 1. Schematic diagram of rotational double-prism system

Fig. 2. Flowchart of field of view expansion method

Fig. 3. Field of view simulation

Fig. 4. Horizontal and vertical field angle expansion factors varying with rotation angle of double prisms. (a) Horizontal field angle expansion factor; (b) vertical field angle expansion factor

Fig. 5. Mosaic simulations. (a) Mosaic simulation of field of view for positions (-30°,90°) and (-90°,90°); (b) mosaic simulation of field of view for positions (-30°,90°) and (90°,90°); (c) mosaic simulation of field of view for positions (90°,90°) and (-30°,120°); (d) mosaic simulation of field of view for positions (30°,180°) and (-30°,180°)

Fig. 6. Two-way rotating double prism imaging system. (a) Schematic diagram of two-way rotating double prism imaging system; (b) experimental setup

Fig. 7. Pictures collected by double prism system. (a) (90°,90°); (b) (-90°,90°); (c) (30°,180°); (d) (-30°,90°); (e) (-30°,120°); (f) (-30°,180°)

Fig. 8. Images after distortion correction. (a) (90°,90°); (b) (-90°,90°); (c) (30°,180°); (d) (-30°,90°); (e) (-30°,120°); (f) (-30°,180°)

Fig. 9. Mosaic results. (a) Mosaic result of Figs. 8(b) and 8(d); (b) mosaic result of Figs. 8(a) and 8(d); (c) mosaic result of Figs. 8(a) and 8(e); (d) mosaic result of Figs. 8(c) and 8(f)