Production-Oriented Stereoscopic Pipeline and Optimization
Date Issued
2016
Date
2016
Author(s)
Guan, Shuen-Huei
Abstract
With the popularity of stereoscopic movies and games, several researches are published. stereoscopy, or S-3D, becomes one of hot topics, for a while, in computer vision, computer graphics, psychology, and other related fields. Lots of research works are proposed to solve issues in display technologies, signal post-processing, human visual perception, and fundamental quality as- sessment. These works all provide inspiring insights, significant solutions to some issues, and even open questions for future research. However, seldom works are started from the viewpoint of producers, or more specifically, pro- duction studios that make stereoscopic films, visual effect, or games. It is a necessary but challenging task for creative producers to have an idea how the target audience might perceive when watching a stereoscopic film in a cinema during production. That is, it is a problem of bringing tar- get consumers’ perception into producers’ work-flow. Moreover, during the pipeline of a S-3D production, much communication happens between experts with different profession, including directors, producers, supervisors, layout artists, technical directors, coordinators and others. Having an effective com- municate and even a measurement of the stereoscopic effect is fundamental through the whole pipeline. This paper proposes a novel metric, geometric perceived depth percent- age (GPDP), to numerate and depict the depth perception of a scene before rendering. In addition to the geometric relationship between the object depth and focal distance, GPDP also takes the screen width and viewing distance ivinto account. As a result, it provides a more intuitive mean for predicting stereoscopy and is universal across different viewing conditions. Furthermore, based on GPDP, a practical tool is designed to visualize the stereoscopic perception without the need of any 3D device or special environ- ment. The tool utilizes the stereoscopic comfort volume, GPDP-based shad- ing schemes, depth perception markers, and GPDP histograms as visual cues so that S-3D layout artists can set stereoscopic parameters more easily. The tool can be easily implemented into any modern rendering pipeline, including interactive Autodesk Maya [1] and off-line Pixar’s RenderMan renderer [2]. It has been used in several production projects including commercial ones. Sometimes, we might need to fine-tune depth effect in post-processing when time and budget is not allowed for time-consuming in-production pipeline, or there is no 3D scenes to work on (ex, the video is a mix of real shooting and CG animation). An 3D experience optimization by fixing visual fatigue and depth perception is proposed, too. Five principles are proposed to reduce visual fatigue and enhance depth perception. Finally, several user studies show that GPDP is a proper depth perception indicator and the proposed tool can make the stereoscopic parameter setting process more easy and efficient.
Subjects
Computer Graphics
Stereoscopy
S-3D
3D, Binocular Vi- sion
Stereoscopic Vision
Production Pipeline.
Type
thesis
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