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Comparing numerical error and visual quality in reconstructions from compressed digital holograms

机译：比较压缩数字全息图重建中的数值误差和视觉质量

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摘要

Digital holography is a well-known technique for both sensing and displaying real-world three-dimensional objects. Compression of digital holograms has been studied extensively, and the errors introduced by lossy compression are routinely evaluated in a reconstruction domain. Mean-square error predominates in the evaluation of reconstruction quality. However, it is not known how well this metric corresponds to what a viewer would regard as perceived error, nor how consistently it functions across different holograms and different viewers. In this study, we evaluate how each of seventeen viewers compared the visual quality of compressed and uncompressed holograms' reconstructions. Holograms from five different three-dimensional objects were used in the study, captured using a phase-shift digital holography setup. We applied two different lossy compression techniques to the complex-valued hologram pixels: uniform quantization, and removal and quantization of the Fourier coefficients, and used seven different compression levels with each.
机译：数字全息术是用于感测和显示现实世界的三维物体的众所周知的技术。已经对数字全息图的压缩进行了广泛的研究，并且有损压缩引入的误差通常在重建域中进行评估。均方误差在重建质量评估中占主导地位。然而，未知的是，该度量与观察者认为的感知误差的对应程度如何，或者在不同的全息图和不同的观察者中如何一致地起作用。在这项研究中，我们评估了十七个观看者中每个观看者如何比较压缩和未压缩全息图重建的视觉质量。研究中使用了来自五个不同三维物体的全息图，并通过相移数字全息图设置捕获了全息图。我们对复数值全息像素应用了两种不同的有损压缩技术：均匀量化，傅立叶系数的去除和量化，并分别使用了七个不同的压缩级别。

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