Abstract
An important aspect of a subject�s perception of virtual objects in a virtual environment is whether the size of the object is perceived as it would be in the physical world, which is named size-constancy. The ability of subjects to appreciate size-constancy in an immersive virtual environment was studied while scene complexity, stereovision and motion parallax visual factors were manipulated resulting in twelve different viewing conditions. Under each visual condition, 18 subjects made size judgments of a virtual object displayed at five different distances from them. Responses from the majority of our population demonstrated that scene complexity and stereovision have a significant impact on subjects' ability to appreciate size-constancy. In contrast, motion parallax produced by moving the virtual environment or by the movements of the observer alone proved not to be a significant factor in determining size-constancy performance. Consequently, size-constancy is best obtained when scene complexity and stereovision are components of the viewing conditions.
Highlights
Virtual Environments (VEs) are used for a variety of research and commercial purposes, such as medical rehabilitation training, scientific data mining and industry manufacturing[16,20, 9, 11,[9]
Size-constancy performance, as measured by percent visual angle (VA), was better when viewing under the ENV conditions than under the NO-ENV conditions and better under STEREO conditions than under monocular vision (MONO) conditions
Our results illuminate several important issues regarding the perception of size-constancy in projection based VE systems
Summary
Virtual Environments (VEs) are used for a variety of research and commercial purposes, such as medical rehabilitation training, scientific data mining and industry manufacturing[16,20, 9, 11,[9]. The limitations of the VE can have an adverse affect on its use and the credibility of the environments that it offers. One significant aspect of this problem is whether users can perceive size-constancy in the VE. Does the perceived size of objects rendered in a VE remain constant regardless of its distance from the observer?. The recent work of Kenyon et al [18] demonstrated size-constancy behavior in subjects using a CAVE® (CAVE Automatic Virtual Environment) [8]. For a majority of their population monocular cues to depth were required to accompany the persistent steoreoptic attribute of the object to reinforce its true size.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
