Gangrong Qu is Supported by the NSFC(No.60372015);the Science Foundation of Bei- jing Jiaotong University(No.2002SM54;Wang Caifang and Jiang Ming is supported in part by the Chinese NKBRSF(No.2003CB716101); NSFC(No.60325101,No.60532080,No.60628102);Ministry of Educa- tion(No.306017);Engineering Research Institute of Peking University,Microsoft Research Asia.
Many imaging systems can be modeled by the following linear system of equations Ax=b,(1) where the observed data is b=(b^1...b^M)~T∈K^M and the image is x=(x_1…x_N)~T∈K^N.The number field K can be the reals R or th...