Method

High-resolution image Column direction

Maximum

Minimum

Mean

RMS

Ridge estimation iterative method

0.001234

0.000975

0.001076

4.4844E−05

Spectrum correction iteration

0.000351

0.000286

0.000316

1.6879E−05

Conjugate gradient method

0.003224

0.002735

0.002866

6.5588E−05