The wavefront reconstructed errors of full parallax holographic stereograms are analysed. The optical transfer function (OTF) is simulated to investigate frequency response and imaging quality of holographic stereogram systems. The behaviour of the OTF with respect to slit size and spatial frequency in different aberrations is described and used to optimize the exit pupil function. The shaped window function (Gaussian and Blackman) is proposed to be used as the exit pupil function of holographic systems, and the influence of different exit pupil functions on the OTF is investigated in detail. The calculated results show that the shaped exit pupil function with optimized slit size can improve the imaging quality of full parallax holographic stereogram systems effectively. The design criterion of the exit pupil function is also discussed.

No abstract

No abstract

No abstract

A novel nonuniform sampling method for bandwidth compression of full parallax holographic stereograms is presented. The configuration of the holographic stereograms and the angular-frequency characteristics of the holographic element on the holographic plane are investigated. The sampling angular-frequencies are chosen for each hogel according to their spectral distribution. Sampling and decompression process for low-pass and band-pass hogels are both introduced. The decompressed hogels can reconstruct their angular spectral distributions accurately, which demonstrates that the nonuniform sampling is a lossless method. Simulation experiments are carried out to verify the proposed method. The results indicate that the method can reduce the number of samples to 46.26% of that of the traditional uniform sampling method, and the decompressed holographic stereogram can reconstruct full parallax images of a 3D object with high quality.