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In this article we propose a new super-resolution algorithm tailored for light field cameras, which suffer by design from a limited spatial resolution. To do so, we cast the light field super-resolution problem into an optimization problem, where the particular structure of the light field data is captured by a nonsmooth graph-based regularizer, and all the light field views are super-resolved jointly. In our experiments, we show that the proposed method compares favorably to the state-of-the-art light field super-resolution algorithms in terms of PSNR and visual quality. In particular, the nonsmooth graph-based regularizer leads to sharper images while preserving fine details.
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Loïc Arnaud Baboulaz, Paolo Prandoni, Martin Vetterli, Zhou Xue