Improved-fidelity error diffusion through blending with pseudorandom encoding

Error diffusion (ED) and pseudorandom encoding (PRE) methods of designing F ourier transform holograms are compared in Brms of their properties and the optical performance of the resulting far-field diffraction patterns. Altho ugh both methods produce a diffuse noise pattern due to the error between t he desired fully complex pattern and the encoded modulation, the PRE errors reconstruct uniformly over the nonredundant band-width of the discrete-pix el spatial Light modulator, while the ED errors reconstruct outside the win dow of the designed diffraction pattern. Combining the two encoding methods produces higher-fidelity diffraction patterns than either method produces individually. For some designs the fidelity of the ED-PRE algorithm is even higher over the entire nonredundant bandwidth than for the previously repo rted [J. Opt. Sec. Am. A 16, 2425 (1999)] minimum-distance-PRE algorithm. ( C) 2000 Optical Society of America [S0740-3232(00)00609-8] OCIS codes: 230. 6120, 090.1760, 070.2580, 030.6600.