Figure 2

Deblurring results of$\mathbf{256}\mathbf{\times }\mathbf{256}$sparse Word image convolved by a$\mathbf{7}\mathbf{\times }\mathbf{7}$Gaussian kernel generated by the MATLAB command$\mathbf{fspecial}\mathbf{(}\mathbf{\text{‘}}\mathbf{Gaussian}\mathbf{\text{’}}\mathbf{,}\mathbf{7}\mathbf{,}\mathbf{15}\mathbf{)}$. Upper left: original image; upper middle: blurred image. The other three are reconstructed images, respectively, by the $A^T$ Bregman iteration, the reweighted ${\ell }_1$ minimization algorithm, and the chaotic iteration.