Efficient Image Processing in Fourier Holography for Moving Images

For still images, diffraction-based beam-forming of laser light is a well-known task in optics called Fourier holography. Using a phase-only diffractive optical element (DOE) which displays a computer-generated hologram (CGH) very efficient beam forming is realized The drawbacks of this technique are massive computation costs for phase-only holograms. In this paper, we briefly describe this diffraction-based technology. Then, we depict an algorithm which is well-suited for CGH calculation. This algorithm for still images is adopted to calculate phase holograms for moving images in real-time. Then, simulations reveal remarkable performance characteristics of the algorithm when used for correlated images. We investigate the dependency of the per pixel difference of consecutive images on the reconstruction quality of the algorithm. We show that reconstruction quality can be improved significantly for moving images when highly correlated images are used. This gain can be used to lower computation costs.