Unfocused Blur Assessment of SAR Images

Unfocused blur assessment is an important part of SAR image quality evaluation system. The mainlobe of unfocused point target is widened and the sidelobe is raised, leading to broadened edges in the azimuth direction. Based on this phenomenon, we proposed a new method to evaluate the extent of unfocused blur using truncated image spectrum and the average edge width in the salient area. A new metric UBE is defined and verified by experiments.