Fig. 1. Schematic diagram of a wireless optical communication system using a double reflector

Fig. 2. Structure of the filter carousel

Fig. 3. Schematic diagram of light reflected by a 2D reflector. (a) 3D coordinate; (b) 2D coordinate

Fig. 4. Variation of the light intensity value of the reflected beam passing through the filter module. (a) Light spot diagram at t=0.10 s; (b) light spot diagram at t=0.05 s; (c) light intensity variation with time

Fig. 5. Double spot maps in the alignment case. (a) Original color map; (b) grayscale map

Fig. 6. Double spot maps with offset. (a) Original color map; (b) grayscale map

Fig. 7. Flow chart of multi-spot/overlapping spot center extraction and spot control

Fig. 8. Overlapping double-spot images. (a) Edge-extracted grayscale map; (b) cross-section of the grayscale distribution map

Fig. 9. Relationship between shape factor and the degree of spot overlap

Fig. 10. Diagrams of overlapping light spots segmentation. (a) Segmentation results; (b) light spot center extraction results

Fig. 11. Double-spot grayscale images. (a) No overlap; (b) less overlap; (c) more overlap

Fig. 12. Split effect. (a) No overlap; (b) less overlap; (c) more overlap

Fig. 13. Histogram of mean standard deviation