Edge-aware Bidirectional Diffusion for Dense Depth Estimation from Light Fields
This addresses depth estimation for computer vision applications, but appears incremental as it builds on existing light field and diffusion methods.
The paper tackles dense depth estimation from light fields by proposing an algorithm that uses a sparse set of depth edges and gradients, disambiguated through bidirectional diffusion to separate depth from texture edges. The result is fast and accurate depth maps, though no concrete numbers are provided in the abstract.
We present an algorithm to estimate fast and accurate depth maps from light fields via a sparse set of depth edges and gradients. Our proposed approach is based around the idea that true depth edges are more sensitive than texture edges to local constraints, and so they can be reliably disambiguated through a bidirectional diffusion process. First, we use epipolar-plane images to estimate sub-pixel disparity at a sparse set of pixels. To find sparse points efficiently, we propose an entropy-based refinement approach to a line estimate from a limited set of oriented filter banks. Next, to estimate the diffusion direction away from sparse points, we optimize constraints at these points via our bidirectional diffusion method. This resolves the ambiguity of which surface the edge belongs to and reliably separates depth from texture edges, allowing us to diffuse the sparse set in a depth-edge and occlusion-aware manner to obtain accurate dense depth maps.