The concepts Point Spread Function (PSF) and Modulation Transfer Function (MTF) are base din the linear and local- linear methods of super-resolution. The resolving function, noise factor and value of achieved resolution are introduced into consideration. It is possible to make the definitions RPSF and RMTF for the resolved images. Values of the achieved resolutions will be estimated by the ratio of integral from RMTF to integral from MTF. It is possible to make the definitions NPSF and NMTF for the nonlinear iterative methods and similarly to estimate values of the achieved resolution. The report is devoted to the comparative analysis of the methods of super-resolutions.