Autofocus system and method in digital holography
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United States of America Patent
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Mar 26, 2019
Grant Date -
Nov 9, 2017
app pub date -
Nov 30, 2015
filing date -
Nov 28, 2014
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Abstract
At least one embodiment relates to an autofocus method for determining a focal plane for at least one object. The method includes reconstructing a holographic image of the at least one object such as to provide a reconstructed image at a plurality of different focal depths. The reconstructed image includes a real component and an imaginary component. The method also include performing a first edge detection on the real component for at least two depths of the plurality of different focal depths and a second edge detection on the imaginary component for the at least two depths. Further, the method includes obtaining a first measure of clarity for each of the at least two depths based on a first measure of statistical dispersion with respect to the first edge detection and a second measure of clarity.
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