IEEE Trans Pattern Anal Mach Intell - Estimation of Alpha Mattes for Multiple Image Layers.

Tópicos

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Resumo

Image matting deals with the estimation of the alpha matte at each pixel, i.e., the contribution of the foreground and background objects to the composition of the image at that pixel. Existing methods for image matting are typically limited to estimating the alpha mattes for two image layers only. However, in several applications one is interested in editing images with multiple objects. In this work, we consider the problem of estimating the alpha mattes of multiple (n = 2) image layers. We show that this problem can be decomposed into n simpler subproblems of alpha matte estimation for two image layers. Moreover, we show that, by construction, the estimated alpha mattes at each pixel are constrained to sum up to 1 across the multiple image layers. A key feature of our framework is that the alpha mattes can be estimated in closed form. We further show that, due to the nature of spatial regularization used in the estimation, the final estimated alpha mattes are not constrained to take values in [0, 1]. Hence, we study the optimization problem of estimating the alpha mattes for multiple image layers subject to the fact that the alpha mattes are nonnegative and sum up to 1 at each pixel. We present experiments to show that our proposed method can be used to extract mattes of multiple image layers.

Resumo Limpo

imag mat deal estim alpha matt pixel ie contribut foreground background object composit imag pixel exist method imag mat typic limit estim alpha matt two imag layer howev sever applic one interest edit imag multipl object work consid problem estim alpha matt multipl n imag layer show problem can decompos n simpler subproblem alpha matt estim two imag layer moreov show construct estim alpha matt pixel constrain sum across multipl imag layer key featur framework alpha matt can estim close form show due natur spatial regular use estim final estim alpha matt constrain take valu henc studi optim problem estim alpha matt multipl imag layer subject fact alpha matt nonneg sum pixel present experi show propos method can use extract matt multipl imag layer

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