Fig. 1. Schematic of single camera DIC panoramic measurement system

Fig. 2. 3D imaging model

Fig. 3. Panoramic imaging process

Fig. 4. Transformation relationship between virtual and real images

Fig. 5. Error cloud map of fitted surface of planar mirror

Fig. 6. Experimental optical path

Fig. 7. Imaging relationship in mirrorsduring tensile test

Fig. 8. Engineering strain of four sub-regions

Fig. 9. Engineering strain cloud maps when the time sequence is 78 s. (a) Sub-region rear 1; (b) sub-region front 1; (c) sub-region front 2; (d) sub-region rear 2

Fig. 10. Displacement transformation of front and rear surfaces

Fig. 11. Relative error of front and rear surface displacements

Fig. 12. Thickness cloud maps of decision currency

Fig. 13. Three-dimensional reconstruction of decision currency

Fig. 14. Experimental setup of four-camera measurement system

Fig. 15. Three-dimensional reconstruction of decision currency by four-camera DIC system