Fig. 1. Principle diagram of optical field imaging

Fig. 2. Measured results of PSF of LYTRO camera

Fig. 3. Hexagonal RST coordinate system

Fig. 4. Distribution and location diagram of diffusion function points (a) and local magnification diagram (b)

Fig. 5. Distribution of color filters and diffusion function points

Fig. 6. Pyramid model

Fig. 7. Pyramid algorithm model of LYTRO camera

Fig. 8. Algorithm flow chart

Fig. 9. Original image information collected by LYTRO camera. (a) Image 1; (b) image 2

Fig. 10. Experimental results and local enlargement of 4 algorithms

Fig. 11. Color recovery results of two sets of images. (a) Bilinear algorithm; (b) Lu's algorithm; (c) adaptive algorithm; (d) proposed algorithm

Fig. 12. Original image and sub-aperture images. (a) Original image; (b) sub-aperture image; (c) 7×7 sub-aperture images

Fig. 13. Original image and local magnified images. (a) Original image; (b) local magnification image 1; (c) local magnification image 2; (d) local two times enlarged image 3

Fig. 14. Experimental comparison of algorithms. (a) Toolbox W/O rectification+dual three-time on-sample; (b) toolbox W/O rectification+super-resolution; (c) document algorithm[25]; (d) proposed algorithm