Table 1 Summary of the parameter selections

1

N ₀

Scale of the patch

8

2

K

Number of atoms in the dictionary

256

3

L ^D₀

Sparsity level for dictionary learning

5

4

L ^S₀

Sparsity level for sparse representation

5

5

ɛ ₁

Stopping criterion about the projection

0.001

6

ɛ ₂

Stopping criterion about the sparse representation

0.001