Fig. 1. (a) Multi-circle target; (b) Image acquisition environment based on parallel light tube; (c) A target image acquired by an infrared camera

Fig. 2. (a) Image coordinate system; (b) Target coordinate system

Fig. 3. Overall architecture of proposed blur kernel estimation network

Fig. 4. Schematic diagram of super-resolution reconstruction

Fig. 5. (a) Cropped portions of the images captured by long-focus infrared camera (a) and short-focus infrared camera (b) and synthesized high-resolution image

Fig. 6. Estimated blur kernels of long-focus infrared camera (a) and short-focus infrared camera (b)

Fig. 7. Visual results of different methods on real-world images captured by long-focus infrared camera for scale factor 4

Fig. 8. Visual results of different methods on real-world images captured by short-focus infrared camera for scale factor 4

Fig. 9. Visual results of different methods on 4-bar target image captured by long-focus infrared camera for scale factor 4