An Investigation of Using Random Dot Patterns to Achieve X-Ray Vision For Near-Field Applications of Stereoscopic Video Based Augmented Reality Displays
Year: 2018
Type: dissertation
Abstract: As one of the most interesting applications of Augmented Reality, ‘X-ray vision’ involves the presentation of computer generated objects as if they lie behind a real object surface. Achieving this notion presents several challenges, including perceptual ambiguity about the ordinal and absolute depth of the virtual object relative to the real object’s surface and maintaining sufficient information about the virtual and real object. This thesis investigates how random dots on an object’s surface can facilitate seeing a virtual object as behind the surface with stereoscopic displays. Using a psychophysical method, Experiment 1 demonstrated the potential of this approach to improve ordinal depth judgements. Experiment 2 investigated the effect of dot size and dot density on transparency ratings of the real surface while preserving surface details. Paired Comparison results revealed an advantage of the proposed method in comparison with the ‘no pattern’ condition for the transparency ratings. Surface detail preservation was also descriptively shown to decrease with increasing dot density and dot size. Experiment 3 explored the impact of variations in image sharpness, dot size and dot density of the random dot pattern, and the depth of the virtual object, on the accuracy and difficulty of absolute depth judgements about the virtual object. Compared to the ‘no-pattern’ condition, the random dot patterns improved the accuracy of depth judgments. In estimating the depth of the virtual object when random dot patterns were used, no main effect of dot size was found. However, interactions suggested higher dot densities lead to smaller errors. Moreover, subjective difficulty ratings in performing depth judgements with sharper patterns may indicate that the random dot patterns support the use of convergence as a beneficial depth cue. The implications of these findings for the design of ‘X-ray’ displays for near-field (including medical) stereoscopic AR are discussed.
Source: TSpace (University of Toronto)
Author: Sanaz Ghasemi
Language: English
Subfield: Media Technology
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2900673122