Enhancement of two-dimensional holographic images by resolutionimprovement through hologram aperture expansion

摘要

The application of the 1-D aperture expansion algorithm to 2-Dholograms is demonstrated for the cases of 1-point, 2-point, andquasi-continuous objects in the presence of noise. Due to the 1-D natureof the algorithm, different predictive models used for rows and columnsin the case of 2-point and similar objects; which calls for some priorknowledge of the object geometry. Quality of images from expandedholograms may be improved by reconstructing at a distance whichoptimizes a quality criterion in the image. Of the two methodsconsidered for reconstructing area holograms the 2-D method performsbetter with prediction errors and noise and is computationally faster