Fig. 1. Optical path diagram of non-orthogonal interference phase imaging device (M: total reflective mirror; BS: beam splitter prism; L: lens; D: diaphragm; MO: microscope objective; POL: electric rotating polarizer; P: parallel component; S: vertical component)

Fig. 2. Two-medium concentric ellipsoid model. (a) Three-dimensional space diagram of the model ; (b) phase shift distribution of the model in X direction

Fig. 3. Concentric ellipsoid model edge detection results. (a) Canny edge operator detection map of the model in YOZ plane; (b) LOG edge operator detection diagram of the model in YOZ plane; (c) projection boundary of the model in YOZ plane; (d) projection boundary of the model in the other plane

Fig. 4. Principle diagram of direct linear transformation algorithm

Fig. 5. Projection boundary and enlarged local boundary of the model in YOZ plane

Fig. 6. Reconstruction results of two-medium concentric ellipsoid model. (a) Three-dimensional distribution of model reconstruction result; (b) boundary point distribution of axial section of external ellipsoid; (c) boundary point distribution of axial section of inner sphere

Fig. 7. Phase diagrams and inversion morphology of polystyrene micro-sphere. (a)-(b) Phase diagrams of two incidental beam with an angle of 60° in incidental direction; (c) reconstructed three-dimensional morphological distribution; (d) axial section boundary point distribution and fitting evaluation