Fig. 1. Key technologies of surgical navigation system

Fig. 2. AR surgical navigation

Fig. 3. Video assisted thoracoscopic surgery navigation system for resection of tumor at the top of liver^［40］

Fig. 4. Multimodal navigation images for 3D-LHNS laparoscopic hepatectomy^［45］

Fig. 5. Fixed display equipment

Fig. 6. Mobile handheld display device

Fig. 7. Mobile phone screen surveillance of hematoma location markers^［48］

Fig. 8. Doctors wear 3D glasses to view enhanced images on stationary display

Fig. 9. Translucent screen

Fig. 10. Medarpa system with translucent screen^［51］

Fig. 11. Video perspective head-mounted display

Fig. 12. Principle of intraoperative navigation display in Google glasses

Fig. 13. Projection display technology

Fig. 14. Location of intracranial hematoma with body surface projection

Fig. 15. Principle for calibration method based on homography

Fig. 16. Texture mapping

Fig. 17. Bezier surface

Fig. 18. Correction of projection distortion of irregular surface^［99］

Fig. 19. Quadric surface imaging relationship