Abstract
A new image processing technique is described that has been found well suited for the fully automatic evaluation of Young's fringes in speckle pattern photography. The basic idea is fringe pattern analysis by creating synthetic images and fitting them to the image picked up by a TV camera. High speed fringe generation and comparison is achieved using a videoprocessor. A theoretical discussion and experimental results show the efficiency of this method for subfringe evaluation, i.e. the measurement of displacements well below the mean speckle size.
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