Rank Reduced Alternative Matting Laplacian
François Pitié · 2016
Cutting out objects from an image and estimating the corresponding transparency masks is a key step in post-production. One popular technique for pulling the transparency values is the closed-form approach of Levin et al.[6]. It is used in many matting algorithms for smoothing the initial noisy guess of the transparency map. Recently we proposed in [8] a more efficient alternative formulation to the original closed-form approach. In the new formulation the matting model parameters are fully exposed, which allows for more useful spatial constraints to be defined. We present in this paper how this new approach [8] can be sped up by considering local re-parametrisation of the matting model.