Optimization-based image reconstruction in x-ray computed tomography by sparsity exploitation of local continuity and nonlocal spatial self-similarity
Zhang Han-Ming, Wang Lin-Yuan, Li Lei, Yan Bin†, 
, Cai Ai-Long, Hu Guo-En
, Cai Ai-Long, Hu Guo-En (a) A modified CS-phantom shown in the grayscale window [0,1]. (b) A gradient magnitude image of the phantom shown in the grayscale window [0,0.05]. The phantom array comprises 52780 nonzero pixels, and there are 22779 nonzero values in its gradient image.
