Quantitative slope evaluation by subtracting the out-of-plane displacement phase maps
that are sheared along the x direction in a three-aperture digital speckle pattern
interferometry arrangement. The
figures show the (a) wrapped phase map and unwrapped (b) 2D and (c) 3D plots of slope.
For further details, see the paper by Bhaduri et al., pp. 5680-5686.