Fig. 1. Schematic diagram of mapping relationship of object points in different viewpoints

Fig. 2. Sparse representation of light field. (a) Central sub-aperture image and disparity map; (b) sub-aperture images

Fig. 3. Sub-aperture images and EPI. (a) Sub-aperture images; (b) EPI

Fig. 4. EPI of foreground alpha images

Fig. 5. Disparity map. (a) Disparity map of platonic scene; (b) disparity map of antinous scene

Fig. 6. Comparison of alpha images in different scenes. (a) Central sub-aperture alpha image; (b) alpha image of propagation algorithm at u=1,v=1; (c) alpha image of each sub-aperture matting algorithm at u=1,v=1

Fig. 7. Comparison of alpha matting results in different scenes. (a) Central sub-aperture alpha matting result; (b) alpha matting result of propagation algorithm at u=1,v=1; (c) alpha matting result of each sub-aperture matting algorithm at u=1,v=1

Fig. 8. EPIs of different scenes. (a) EPI obtained by propagation algorithm in platonic scene when v=1,y=92; (b) EPI obtained by each sub-aperture matting algorithm in platonic scene when v=1,y=92; (c) EPI obtained by propagation algorithm in antinous scene when v=1,y=445; (d) EPI obtained by each sub-aperture matting algorithm in antinous scene when v=1,y=445

Fig. 9. Central sub-aperture alpha image and disparity map of real light field data. (a) Central sub-aperture alpha image; (b) disparity map

Fig. 10. alpha images and alpha matting results of real light field data obtained by different algorithms. (a1)(a2) Central sub-aperture images; (b1)(b2) propagation algorithm; (c1)(c2) each sub-aperture matting algorithm

Fig. 11. EPIs of real light field data alpha matting. (a) EPI obtained by propagation algorithm in platonic scene when v=1,y=390; (b) EPI obtained by each sub-aperture matting algorithm in platonic scene when v=1,y=390; (c) EPI obtained by propagation algorithm in antinous scene when v=1,y=435; (d) EPI obtained by each sub-aperture matting algorithm in antinous scene when v=1,y=435

Fig. 12. Comparison of real light field data fusion (u=1,v=1). (a) Result obtained by propagation algorithm; (b) result obtained by each sub-aperture matting algorithm; (c) partial enlarged image of Fig. 12(a); (d) partial enlarged image of real light field data; (e) partial enlarged image of Fig. 12(b)

Fig. 13. EPI of fusing light field data (v=1,y=598). (a) EPI obtained by propagation algorithm; (b) EPI of real light field data; (c) EPI obtained by each sub-aperture matting algorithm

Fig. 14. Comparison of new generated viewpoint of real light field data (u=1,v=1.5). (a) New viewpoint generated by propagation algorithm; (b) new viewpoint generated by each sub-aperture matting algorithm

Fig. 15. EPIs of new viewpoint images of real light field data. (a) EPI of new viewpoint image obtained by propagation algorithm when v=1,y=71; (b) EPI of new viewpoint image obtained by each sub-aperture matting algorithm when v=1,y=71; (c) EPI of new viewpoint image obtained by propagation algorithm when v=1,y=528; (d) EPI of new viewpoint image obtained by each sub-aperture matting algorithm when v=1,y=528

Table 1. Consistency evaluation of synthetic light field alpha images

Table 2. Consistency evaluation of real light field alpha images