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Sympathetic quantisation -- a new approach to hologram quantisation

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Document pages: 16 pages

Abstract: Spatial light modulators can typically only modulate the phase or theamplitude of an incident wavefront, with only a limited number of discretevalues available. This is often accounted for in computer-generated holographyalgorithms by setting hologram pixel values to the nearest achievable valueduring what is known as quantisation. Sympathetic quantisation is analternative to this nearest-neighbour approach that takes into account theunderlying diffraction relationships in order to obtain a significantlyimproved post-quantisation performance. The concept of sympathetic quantisationis introduced in this paper and a simple implementation, soft sympatheticquantisation, is presented which is shown to improve mean squared error andstructural similarity index error metrics by 50 for the considered case ofsingle-transform algorithms.

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