GRADUAL AND RANDOM BINARIZATION OF GRAY-SCALE HOLOGRAMS

A new method called gradual and random binarization to binarize gray-s cale holograms, based on an iterative algorithm, is proposed. The bina rization process is performed gradually, and the pixels to be binarize d are chosen randomly. Errors caused by this operation are spatially d iffused. A comparison with other established methods based on error di ffusion, direct binary search and iterative stepwise quantization show s that the gradual and random binarization method achieves a very good compromise between computational complexity and reconstruction qualit y. Optical reconstructions are presented.