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Image Restoration

The image degradation model
$\displaystyle \mathbf{y} = \mathbf{Ax} +\mathbf{n}$

Testing for latex.
$\frac{1}{2}\|\mathbf{Ax} - b \|_2^2 + \lambda\| \mathbf{x} \|_1$ , is the $\ell_1$ regularized least-squares problem.