A digital holographic autofocus imaging method based on the rule of thirds and genetic algorithm

Abstract

This invention relates to a digital holographic autofocus imaging method based on the ternary method and a genetic algorithm, comprising the following steps: acquiring the off-axis digital hologram of the object to be processed and the recording distance; preprocessing to obtain a complex amplitude distribution; setting a search range, a first focusing evaluation function, a first reconstruction distance, a second reconstruction distance, and a threshold; iteratively narrowing the search range of the focusing plane using the ternary method and the first focusing evaluation function AMP in a non-fixed step size manner; and then accurately locating the focusing plane within the narrowed search range using the genetic algorithm and the second focusing evaluation function DIF. Compared with existing technologies, this invention has advantages such as high sensitivity, high accuracy, and wide applicability.

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