Subjective evaluation of stereoscopic images: Effects of camera parametersand display duration

In this paper; two experiments are presented that were aimed to investigate the effects of stereoscopic filming parameters and display duration on obs ervers' judgements of naturalness and quality of stereoscopic images, The p aper first presents a literature review of temporal factors in stereoscopic vision, with reference to stereoscopic displays, Several studies have indi cated an effect of display duration on performance-oriented (criterion base d) measures. The experiments reported here were performed to extend the stu dy of display duration from performance to appreciation-oriented measures. In addition, the present study aimed to investigate the effects of manipula ting camera separation, convergence distance, and focal length on perceived quality and naturalness. In the first experiment, using display durations of both 5 and 10 s, 12 obs ervers rated naturalness of depth and quality of depth for stereoscopic sti ll images. The results showed no significant main effect of display duratio n, A small vet significant shift between naturalness and quality was found for both duration conditions. This result replicated earlier findings, indi cating that this is a reliable effect, albeit content-dependent. The second experiment was performed using display durations ranging from I to lj s, T he results of this experiment showed a small yet significant effect of disp lay duration. Whereas longer display durations do not have a negative impac t on the appreciative scores of optimally reproduced stereoscopic images, o bservers do give lower judgements to monoscopic images and stereoscopic ima ges with unnatural disparity values as display duration increases. In addit ion, the results of both experiments provide support for the argument that stereoscopic camera toe-in should be avoided if possible.