Iterative scheme for establishing optimal position of focusing lens and retinal camera for implementing same

Abstract

An approach to autofocus is introduced herein in which an iterative scheme is implemented to perform pairwise comparisons of digital images to identify the optimal position for the focusing lens. This approach relies on the fact that digital images taken in rapid succession are not completely independent but are of the same subject with varying degrees of blur or defocus. According to this approach, a retinal camera can proceed through a series of steps analyzing pairs of digital images until an optimal position for the focusing lens is found.

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