Table 1: Image deblurring using LSQR and IDR( ) for “Lena” ( ).

Method LSQR IDR(1) IDR(2) IDR(4) IDR(8)

Iter 8 4 6 5 9
MV 16 4 6 5 9
REN 0.0625 0.0705 0.1352 0.0799 0.1832

Iter 32 10 10 9 13
MV 64 10 10 9 13
REN 0.0347 0.0323 0.0314 0.0313 0.0319

Iter 145 32 33 30 35
MV 290 32 33 30 35
REN 0.0170 0.0135 0.0175 0.0140 0.0177