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Surface gradients are useful to surface reconstruction in single view modeling, shape-from-shading, and photometric stereo. Previous algorithms minimize a complex, nonlinear energy functional, or require dense surface gradients to perform integration to generate 3D locations, or require user-input heights to constrain the solution space, or produce severe distortion and smooth out surface details. Most single-view algorithms output a Monge patch (height-field), which may introduce furtherdoi:10.1109/iccv.2007.4409103 dblp:conf/iccv/NgWT07 fatcat:tyegkliairdzle3bbnb6f6gf6q