Sharpness-statistics-based auto-focusing algorithm for optical ptychography

Fast autofocusing of recorded planes by salient feature region for coherent diffraction imaging

“…In practice, the measurement error of the experimental system will lead to the inconsistency between the distance parameters and the physical model of the algorithm [13]. The mismatch parameters will seriously affect the image reconstruction [14]. The distance between the image sensor and the sample needs to be additionally calibrated, and the measurement with additional tools is often biased [15].…”