Several error measures are proposed, which quantify the inaccuracy of image deblurring using a particular incorrect PSF. Using a set of simulation results, it is shown that the desired metric is feasible even without specification of the unblurred prior image or the radiometric response of the camera. It is also shown that the proposed metric accurately and reliably predicts the resulting deblurring error from the use of an approximate PSF in place of an exact PSF.
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Jonathan D. Simpkins, Robert L. Stevenson, "A novel error metric for parametric fitting of point spread functions," Proc. SPIE 9029, Visual Information Processing and Communication V, 90290A (17 February 2014);