The importance of methodology on perceived depth estimates in stereoscopic displays

Daynes, Chelsea (2012). The importance of methodology on perceived depth estimates in stereoscopic displays Honours Thesis, School of Psychology, The University of Queensland.

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Author Daynes, Chelsea
Thesis Title The importance of methodology on perceived depth estimates in stereoscopic displays
School, Centre or Institute School of Psychology
Institution The University of Queensland
Publication date 2012-10-10
Thesis type Honours Thesis
Supervisor Phil Grove
Total pages 68
Language eng
Subjects 1701 Psychology
Abstract/Summary The lateral separation of our eyes results in the projection of slightly different images in each eye that are used to recover depth. One source of information supporting depth perception (stereopsis) is based on binocular disparity, the relative positions of matching retinal points in the two eyes’ images. Another source of information is based on features in the two eyes that cannot be matched. These unmatchable features, referred to as monocular occlusion zones, have been shown to support the recovery of depth in the absence of conventional disparity information. Howard and Duke (2003) claimed to have discovered a new form of stereopsis based on transparency relations between surfaces in depth. They argue that the percept generated by their stimulus is as effective as a disparitybased stimulus, and greater than an occlusion-based stimulus. Howard and Duke (2003) required participants to adjust a depth probe to match the perceived depth of stimulus. This method may be flawed as participants can simply match the perceived depth in the stimuli using eye movements. This thesis investigated whether this depth matching method confounded the effectiveness of their novel transparency stimulus. To do so, we replicated Howard and Duke’s study, and incorporated a condition where participants estimated the perceived depth of a variety of their modified stimuli with a tape measure. The tape measure condition was to eliminate the effects of the depth matching strategy. We hypothesised that the manual estimates of depth would reveal that Howard and Duke’s novel transparency stimulus was no greater than an occlusion-based stimulus. We found no support for this hypothesis. Experiment two investigated whether controlling for eye movements would reveal the original hypothesised trend. Indeed, we observed that the depth generated by each stimulus were more similar. The results showed that Howard and Duke (2003) overestimated the effectiveness and robustness of their novel transparency stimulus as they did not control for eye movements. Theoretical implications are discussed in light of the present investigation and existing studies.
Keyword Perceived depth estimates
Stereoscopic displays

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Created: Fri, 22 Feb 2013, 15:59:05 EST by Mrs Ann Lee on behalf of School of Psychology