拡散型ディジタルホログラフィにおける再生像の誤差評価

概要

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The error of images reconstructed from diffuse-type digital holograms consisting of 8bit data is numerically investigated in order to use them as a technique for encryption and digital watermarking. It is evaluated by the standard deviation of the image difference between the original image and reconstructed one. It is revealed that the error is small for large phase modulation which is operated for the original image to make diffuse-type holograms. At the same time, the error evaluation is done with respect to the effect of hologram defects given by replacing the value of several pixels in a part of holograms with different one. On the basis of the error evaluation, a method by which the original image data are reconstructed in a perfect form is also presented.
2004-02-20