3D characterization of auto-stereo images
January 18, 2011, SPIE Electronic Imaging, Burlingame, CA—Jessica Prevoteau from the University of Reims Champagne-Ardenne and 3DTV Solutions presented a laboratory prototype of a 2-D/3-D imaging measurement system. This instrument is part of a project to characterize the entire production, transmission, display chain. The impetus for this work is the need for standards in a highly subjective area.
As more 3-D content is produced, there is a need for more user control of the 3-D images, to keep the effects comfortable. Therefore, they defined a transform using a model and analysis to compare the features in 2-D and 3-D images of the same scene. The difficulty is the different perceptions of depth effects from user to user.
The test instrument can display individual 2-D features through a two-way mirror that coincide with the locating feature images of a 3-D display and the user is asked if the 2-D image is in front, even with, or behind the 3-D image. Additional data are user demographics and optical characteristics. Tests included visual checks with a standard interocular spacing versus the actual user spacing. The user position was fixed with a forehead and chin support to minimize head movement. The instrument is used to measure levels of depth at multiple positions on the screen and with various combinations of actual screen positioning to compare the images on the autostereo display.
