Abstract
Focus cues are incorrect in conventional stereoscopic displays. This causes a dissociation of vergence and accommodation, which leads to visual fatigue and perceptual distortions. Multi-plane displays can minimize these problems by creating nearly correct focus cues. But to create the appearance of continuous depth in a multi-plane display, one needs to use depth-weighted blending: i.e., distribute light intensity between adjacent planes. Akeley et al. [ACM Trans. Graph. 23, 804 (2004)] and Liu and Hua [Opt. Express 18, 11562 (2009)] described rather different rules for depth-weighted blending. We examined the effectiveness of those and other rules using a model of a typical human eye and biologically plausible metrics for image quality. We find that the linear blending rule proposed by Akeley and colleagues [ACM Trans. Graph. 23, 804 (2004)] is the best solution for natural stimuli.
Highlights
When a viewer looks from one point to another in the natural environment, he/she must adjust the eyes’ vergence such that both eyes are directed to the same point
If we present depth-weighted stimuli on two planes—one at 0D and another at 0.6D—and the eye accommodates in-between those planes, the resulting modulation transfer function (MTF) is the weighted sum of MTFs from Fig. 3
We found the accommodative distance for each intensity ratio that yielded the greatest MTF area from 0 to 30 cpd
Summary
When a viewer looks from one point to another in the natural environment, he/she must adjust the eyes’ vergence (the angle between the lines of sight) such that both eyes are directed to the same point. (Details of the polychromatic model that incorporates monochromatic and chromatic aberrations are Received 5 Aug 2011; revised 22 Sep 2011; accepted 24 Sep 2011; published 6 Oct 2011 10 October 2011 / Vol 19, No 21 / OPTICS EXPRESS 20948 described elsewhere [31].) Image quality and best focus for each spatial frequency and for broadband spatial stimuli, were assessed by computing the area under the product of the NTF and polychromatic MTF. We conclude that the linear rule is close to the optimal rule for presenting natural stimuli in a multi-plane display when the viewer has typical optics and neural filtering
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