Abstract
We investigated the question of how the perception of three-dimensional information reconstructed numerically from digital holograms of real-world objects, and presented on conventional displays, depends on motion and stereoscopic presentation. Perceived depth in an adjustable random pattern stereogram was matched to the depth in hologram reconstructions. The objects in holograms were a microscopic biological cell and a macroscopic metal coil. For control, we used real physical objects in additional to hologram reconstructions of real objects. Stereoscopic presentation increased perceived depth substantially in comparison to non-stereoscopic presentation. When stereoscopic cues were weak or absent e.g. because of blur, motion increased perceived depth considerably. However, when stereoscopic cues were strong, the effect of motion was small. In conclusion, for the maximization of perceived three-dimensional information of holograms on conventional displays, it seems highly beneficial to use the combination of motion and stereoscopic presentation.
Highlights
Digital holography is a technology for imaging three-dimensional (3D) objects
We can refer to both off-axis single captures and full Fresnel fields as digital holograms
There is a precedent for the preparation of optically captured 3D data for display on conventional stereo displays, from the field of confocal microscopy [5]
Summary
Digital holography is a technology for imaging three-dimensional (3D) objects. A digital hologram, recorded with a digital camera, results from the interference between a reference wave front and an object wave front reflected from or transmitted through an object. The development of optoelectronic holographic display technology is in general not mature enough to admit affordable high-quality displays. Before this technology reaches that point, displaying numerical reconstructions on conventional stereo or non-stereo displays seems to be a useful alternative. There is a precedent for the preparation of optically captured 3D data for display on conventional stereo displays, from the field of confocal microscopy [5] It should be noted, that unlike holograms and real physical 3D scenes, conventional stereoscopic displays only have focus cues that specify the depth of display surface but not other depth planes in the scene. The natural correspondence between convergence of the eyes and focus is mostly disrupted, which may cause perceptual distortions, double images, and even eyestrain [6,7]
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