Accelerating phase-added stereogram calculations by coefficient grouping for digital holography
Host Publication: SPIE Photonics Europe, 2020
Authors: D. Blinder and P. Schelkens
Publication Date: Apr. 2020
Number of Pages: 10
Computer generated holography (CGH) is a computationally intensive task, which requires the design of efficient algorithms for calculating realistic holograms in real-time. Sparse CGH algorithms address this challenge by computing holographic signals in a transform domain where they are sparse, thereby requiring only to update a small number of coefficients and speeding up calculations. However, the required memory access patterns form a bottleneck, limiting speed gains. We propose a novel technique for computing phase-added stereograms by grouping Fourier coefficients into sub-stereograms, mapping to contiguous cells in 3D space. We present various implementations of this algorithm, reporting speedup factors ranging from 3 to 30 depending on the devices computing capability, without compromising on quality. This enables real-time CGH for driving holographic displays for more complex scenes.