Fig. 1.

Geometric shapes used to generate the weighting and directions of the encoding vectors for both simple (a, c, e) and balanced (b, d, f) multi-point displacement-encoding strategies. The top row (a, b): two-point encoding in 1D space. The middle row (c, d): three-point encoding in 2D space. The bottom row (e, f): four-point encoding in 3D space. The bars with the dots at the end indicate the encoding vectors. For the simple encoding strategies, an additional phase reference image without displacement encoding is also acquired, as indicated by the dot at the origin.