Fig. 1. Propagation of light in multimode fiber

Fig. 2. Schematics of different sampling manners, the arrows in the figure represent the directions of the vectors . (a) Sampling interval is pixel, =(3,1), = (−1,3); (b) Sampling interval is 3 pixel, =(3,0), =(0,3) 采样方案示意图，图中箭头表示向量 的方向。(a)采样间隔为 pixel， =(3,1)， = (−1,3)；(b)采样间隔为3 pixel， =(3,0)， =(0,3)

Fig. 3. Schematic of experimental setup and the photograph of the experiment platform

Fig. 4. Results at different sampling intervals. (a), (b) Reconstruction results and the position distribution of sampling points when the number of sampling points is 2 400; (c), (d) Reconstruction results and the position distribution of sampling points when the number of sampling points is 2 900; Value below (a) and (c) is the cosine similarity between the reconstruction results to the ground truth; Grey area in (b) and (d) is the intensity envelope region, and the white dots are the sampling points. Zoomed-in view of the distribution of points in the red box is shown on the right

Fig. 5. (a) Similarity versus number of sampling points at different sampling intervals; (b) Variation of minimum number of sampling versus sampling interval under the same image quality, the dashed line represents the upper bound of the number of sampling points; (c) Variation of minimum sampling area versus sampling interval, the dashed line represents the area of the fiber

Fig. 6. Correlation with spatial displacement

Fig. 7. (a) Total elapsed time versus sampling points at different sampling intervals; (b) Variation of minimum time with sampling interval