Fig. 1. Epipolar geometry

Fig. 2. Process of stereo matching using DIC method

Fig. 3. Correction of stereo matching on right image

Fig. 4. Stereo matching process of epipolar constraint correction

Fig. 5. Binocular stereovision model

Fig. 6. Specimen size

Fig. 7. Specimen photo

Fig. 8. Stereovision system

Fig. 9. Experimental photo

Fig. 10. Extensometer and position of measured point

Fig. 11. Comparison of displacement curves before and after correction of epipolar constraint. (a) 1# specimen; (b) 2# specimen; (c) 3# specimen; (d) 4# specimen

Fig. 12. Comparison of displacement error curves before and after correction of epipolar constraint. (a) 1# specimen; (b) 2# specimen; (c) 3# specimen; (d) 4# specimen