Resolution-enhanced holographic stereogram based on integral imaging using a moving array lenslet technique and an aperture array filter.

Abstract

A method in which an integral-imaging-based holographic stereogram (HS) using a moving array lenslet technique (MALT) and aperture array filter toward improving the resolution of a reconstructed three-dimensional (3D) image is presented. The previous resolution-enhanced HS using the MALT method only considered enhancement of the sampling rate without decreasing the volume pixels (voxels) size. The voxels are created by multiple plane waves in different directions emitting from holographic elements (hogels), and the voxel size is equal to the width of plane waves. In order to further improve the resolution of the reconstructed image quality, an aperture array filter is applied to allow the center square part of each plane wave to pass and filter the rest. The filtering process reduces the width of plane waves, and decreases the voxel size as well. The proposed method has a high sampling rate and can reconstruct the 3D image with smaller voxels. The image quality improvement is verified in numerical and optical reconstruction compared to theHSusingMALTalone.