Fig. 1. Basic principle of 360° floating display system based on human eye tracking

Fig. 2. Display system workflow

Fig. 3. Image stitching method and detection effect of stitching place. (a) Image stitching method; (b) detection effect of stitching place

Fig. 4. Calculation method of vertical viewpoint angle

Fig. 5. Catadioptric cylindrical projection optical system

Fig. 6. 360° display algorithm workflow

Fig. 7. MTF curves of catadioptric cylindrical projection optical system

Fig. 8. Mapping relations in different coordinate spaces

Fig. 9. Principles of predistortion correction and polar coordinate system conversion. (a) Correction principle; (b) before predistortion correction; (c) after predistortion correction

Fig. 10. Physical structure of 360° floating display system. (a) System structure; (b) DLP projector optical and mechanical structure

Fig. 11. Error of actual reference fiducial point and fitting reference fiducial point in cylindrical screen space. (a) Error of SFIS; (b) error of FFIS

Fig. 12. Cylindrical screen distortion correction results. (a) Target correction result; (b) before correction; (c) actual correction result

Fig. 13. Error between target correction result and actual correction result in camera space

Fig. 14. Display effect of different viewpoint positions. (a) Looking straight on left side; (b) looking straight in middle; (c) looking straight on right side; (d) looking down on left side; (e) looking down in middle; (f) looking down on right side