Figure 2. The quality improvement factor 
versus the regularisation parameter 
(squares) for our overlapping patches method, and versus 
(dots) for the total variation method.
The used phantom is the 
image of Lena, the reconstruction is performed using only 
noised projections. For our method we have used a 
value fixed to 
, the patches basis shown in figure 1 and a step size of 
.