Efficient Minimization Method for a Generalized Total Variation Functional

Abstract

Replacing the l(2) data fidelity term of the standard Total Variation (TV) functional with an l(1) data fidelity term has been found to offer a number of theoretical and practical benefits. Efficient algorithms for minimizing this l(1)-TV functional have only recently begun to be developed, the fastest of which exploit graph representations, and are restricted to the denoising problem. We describe an alternative approach that minimizes a generalized TV functional, including both l(2)-TV and l(1)-TV as special cases, and is capable of solving more general inverse problems than denoising (e.g., deconvolution). This algorithm is competitive with the graph-based methods in the denoising case, and is the fastest algorithm of which we are aware for general inverse problems involving a nontrivial forward linear operator.