Abstract
In this paper, a fast method for displaying a digital, real and off-axis Fresnel hologram on a lower resolution device is reported. Preserving the original resolution of the hologram upon display is one of the important attributes of the proposed method. Our method can be divided into 3 stages. First, a digital hologram representing a given three dimensional (3D) object is down-sampled based on a fix, jitter down-sampling lattice. Second, the down-sampled hologram is interpolated, through pixel duplication, into a low resolution hologram that can be displayed with a low-resolution spatial light modulator (SLM). Third, the SLM is overlaid with a grating which is generated based on the same jitter down-sampling lattice that samples the hologram. The integration of the grating and the low-resolution hologram results in, to a good approximation, the resolution of the original hologram. As such, our proposed method enables digital holograms to be displayed with lower resolution SLMs, paving the way for the development of low-cost holographic video display.
Highlights
With the advancement of computing technology, digital holography has undergone rapid and encouraging development in the past two decades
By generating the correct binary mask through an iterative process based on Simple Genetic Algorithm (SGA) [8], the binary mask programmable hologram (BMPH) can mimic a hologram with identical resolution as the grating, thereby capable of reconstructing an image with the same resolution of the original hologram
We follow the concept of the BMPH and propose a fast method for displaying an off-axis digital hologram with a lower resolution spatial light modulator (SLM)
Summary
With the advancement of computing technology, digital holography has undergone rapid and encouraging development in the past two decades. Existing spatial light modulators (SLMs), such as the Liquid Crystal on Silicon (LCoS), are small in size and rather expensive Both the resolution and size of these devices can be enhanced with the use of multiple units, or the active tiling (AT) method [3,4,5,6], the complexity and cost of the setup is increased substantially. For certain object images, the method fails to generate the correct binary mask even after large number of iterations Despite all these shortcomings, the BMPH has casted light on the feasibility of using a low-resolution SLM to reconstruct an image obtained from the higher resolution of the original hologram. We follow the concept of the BMPH and propose a fast method for displaying an off-axis digital hologram with a lower resolution SLM.
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