Abstract
The effects of measurement errors on the quality of the images reconstructed from discretely sampled holograms (a) conventionally and (b) by the recently reported weak-signal-enhancement technique (WSET) are examined. Analytical results are obtained for far-field holograms in which (i) phase errors and (ii) amplitude gain errors are present. It is shown that, although weak images are fairly rapidly submerged in phase-error noise for conventional reconstruction (unless the number of sampling points is high), the enhanced weak images are relatively insentive to phase errors. The effect of amplitude errors are fairly similar in the two cases, although twice as serious in the WSET method because of the processing involved. Similar results obtained by computer for the near-field zone are shown.
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