Defocus map estimation from a single image using improved likelihood feature and edge-based basis.

•Edge-based and region-based methods are combined via RTF with linear basis.•Orthogonal gradients with Gabor filter subsets can obtain more accurate likelihood.•First K highest local maximums are effective to serve as the input feature of RTF.•Proposed method outperforms state-of-the-art DME methods.•Proposed method is readily applied to image deblurring and defocus blur detection.