Fast and accurate autofocus method in off-axis digital holography based on an improved amplitude-difference metric and a peak-support interval-zoom search

Key Points

• The new autofocus method reduces errors in various imaging scenarios, enhancing resolution and detail.
• Improvements stem from a novel amplitude-difference metric that boosts focus accuracy significantly.
• Utilizing a peak-support interval-zoom search algorithm, the approach effectively refines autofocus performance across tests.
• This method may enable improved imaging techniques in scientific applications, emphasizing the need for further validation.