Sharpness index and its application to focus control.


A sharpness index function, derived from the intensity distribution in an image aberrated by a quadratic-curvature wavefront distortion, is shown to be very effective as a measure of the correctness of focus. The function is introduced and analyzed in the spatial frequency domain. Broadly, the sharpness index belongs to a family of functions known as image… (More)
DOI: 10.1364/AO.15.000877

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