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Multi-Frame Demosaicing and Super-Resolution from Under-Sampled Color Images (2004)
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BibTeX
@MISC{Farsiu04multi-framedemosaicing,
author = {Sina Farsiu and Michael Elad and Peyman Milanfar},
title = {Multi-Frame Demosaicing and Super-Resolution from Under-Sampled Color Images},
year = {2004}
}
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Abstract
In the last two decades, two related categories of problems have been studied independently in the image restoration literature: super-resolution and demosaicing. A closer look at these problems reveals the relation between them, and as conventional color digital cameras suffer from both low-spatial resolution and color filtering, it is reasonable to address them in a unified context. In this paper, we propose a fast and robust hybrid method of super-resolution and demosaicing, based on a maximum a posteriori (MAP) estimation technique by minimizing a multi-term cost function. The L 1 norm is used for measuring the difference between the projected estimate of the high-resolution image and each low-resolution image, removing outliers in the data and errors due to possibly inaccurate motion estimation. Bilateral regularization is used for regularizing the luminance component, resulting in sharp edges and forcing interpolation along the edges and not across them. Simultaneously, Tikhonov regularization is used to smooth the chrominance component. Finally, an additional regularization term is used to force similar edge orientation in different color channels. We show that the minimization of the total cost function is relatively easy and fast. Experimental results on synthetic and real data sets confirm the effectiveness of our method.
Keyphrases
under-sampled color image multi-frame demosaicing additional regularization term unified context multi-term cost function projected estimate robust hybrid method image restoration literature luminance component tikhonov regularization real data set chrominance component estimation technique di erence low-resolution image related category di erent color channel high-resolution image low-spatial resolution total cost function similar edge orientation conventional color digital camera bilateral regularization sharp edge motion estimation color filtering experimental result
