4.5 Article

Sympathetic quantisation - A new approach to hologram quantisation

Journal

OPTICS COMMUNICATIONS
Volume 473, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.optcom.2020.125883

Keywords

Computer generated holography; Sympathetic quantisation; Spatial light modulators

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Funding

  1. Engineering and Physical Sciences Research Council, United Kingdom [EP/L016567/1, EP/L015455/1, EP/T008369/1]
  2. EPSRC [EP/T008369/1, EP/M016218/1] Funding Source: UKRI

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Spatial light modulators can typically only modulate the phase or the amplitude of an incident wavefront, with only a limited number of discrete values available. This is often accounted for in computer-generated holography algorithms by setting hologram pixel values to the nearest achievable value during what is known as quantisation. Sympathetic quantisation is an alternative to this nearest-neighbour approach that takes into account the underlying diffraction relationships in order to obtain a significantly improved post-quantisation performance. The concept of sympathetic quantisation is introduced in this paper and a simple implementation, soft sympathetic quantisation, is presented which is shown to improve mean squared error and structural similarity index error metrics by 50% for the considered case of single-transform algorithms.

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