I have written a technical report on depth map generation using optical flow which basically explains how Depth Map Automatic Generator (DMAG) works. As DMAG does not explicitly handle occluded pixels, it has a tendency to blur object boundaries. The cool thing about DMAG is that you don't have to give a minimum and maximum disparitiy. You can compare the depths maps obtained by DMAG in this technical report with depth maps obtained by DMAG2, DMAG5, DMAG6, and DMAG7 in A Qualitative Comparison of Selected Automatic DepthMap Generators.
Anyways, here's the link: Depth Map Generation using Optical Flow.
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