  In this paper, we will present a generalization for a minimization problem
from I. Daubechies, M. Defrise, and C. Demol [3]. This generalization is useful
for solving many practical problems in which more than one constraint are
involved. In this regard, we will conclude the findings of many papers (most of
which are on image processing) from this generalization. It is hoped that the
approach proposed in this paper will be a suitable reference for some applied
works where multi-frames, multi-wavelets, or multi-constraints are present in
linear inverse problems.
