Iterative stepwise binarization of digital amplitude holograms with added energy to the signal window

Abstract

We propose a method for optimizing the process of iteratively binarizing digital amplitude holograms by utilizing the effect of adding energy to the reconstructed signal window from the hologram. For this purpose, we introduce a parameter called the energy factor and show that the performance of the iterative binarization process can be greatly enhanced if the value of the energy factor is properly chosen. Finally, we show that the optimal values of this energy factor can be estimated with an analytical function for different computational costs.

Efficient recording and retrieval of complex digital Fresnel holograms based on the line partitioned autoassociative memory

“…The binarization process reduces the size of the holographic data, and also permits the hologram to be printed [16], and subsequently viewed upon illumination with a coherent beam. In the past, different attempts have been made to binarize a hologram, based on iterative adjustment [17] and down-sampling [18]- [19]. However, iterative process is time consuming, and the image quality is degraded significantly with down-sampling.…”

Embedding intensity image in grid-cross down-sampling (GCD) binary holograms based on block truncation coding

“…Since then, progressive development has been made to enhance the fidelity of the information recorded in the binary hologram. For example, employing iterative process to derive the binary hologram fringe patterns for a given source image [6][7][8], or the use of error diffusion [9] to binarize a gray scale hologram [10][11][12][13]. Recently, Tsang et al have proposed a fast, non-iterative method for generating binary holograms which results in reconstructed images with favorable visual qualities.…”

Intensity image-embedded binary holograms

“…The pioneer work can be dated back to the 1960s [4,5] when a successful attempt in the realization of binary Fraunhofer holograms was demonstrated. Later, methods on the generation of binary holograms in an iterative manner have been reported in [6][7][8]. Moderate success has also been attained in applying error diffusion [9] in the binarization of Fourier [10][11][12] and Fresnel [13] holograms.…”