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... Apparatus: For the experiment we built a Wheatstone stereoscope [10] in order to avoid any crosstalk. Our stereoscope has two mirrors at 45 degrees fixed on an optical breadboard, two Dell P2415Q monitors, and a chin rest. ...
In this paper, we study an artifact of stereoscopic 3D (S3D) video called sharpness mismatch (SM), that occurs when one view is more blurred than the other. SM beyond a certain level can create visual discomfort, and consequently degrade the quality of experience. Therefore, it is important to measure the just noticeable sharpness mismatch (JNSM), i.e., the minimal level of SM that is perceived by the human visual system and creates discomfort. The knowledge of the JNSM can be used in the evaluation of the quality of S3D video, and more in general when processing S3D video, like in asymmetric compression. In this paper, we focus in particular on the detection of SM. For this goal, we organized a psychophysical experiment with 23 subjects and a crosstalk-free stereoscopic display in order to gather psychophysical data necessary for the development of a SM detection method. Based on the gathered experiment data, we propose a new SM detection method. The evaluation of this method shows that its performance is close but not better than that of the state-of-the-art methods. Therefore, our goal in the near future is to improve the proposed method.
... To enable stereoscopic vision, one frontally positioned screen displayed the right stereo half-image directly to the right eye. The left stereo half-image appeared on the second screen placed on the left side of the observer; this screen was viewed through a mirror placed in front of the subject such that the right eye's view was not affected (single-mirror stereoscope; see Kollin & Hollander, 2007). Viewing distance to the screens was 80 cm, which amounts to a visual angle of 40.28 horizontally and 248 vertically. ...
When estimating ego-motion in environments (e.g., tunnels, streets) with varying depth, human subjects confuse ego-acceleration with environment narrowing and ego-deceleration with environment widening. Festl, Recktenwald, Yuan, and Mallot (2012) demonstrated that in nonstereoscopic viewing conditions, this happens despite the fact that retinal measurements of acceleration rate-a variable related to tau-dot-should allow veridical perception. Here we address the question of whether additional depth cues (specifically binocular stereo, object occlusion, or constant average object size) help break the confusion between narrowing and acceleration. Using a forced-choice paradigm, the confusion is shown to persist even if unambiguous stereo information is provided. The confusion can also be demonstrated in an adjustment task in which subjects were asked to keep a constant speed in a tunnel with varying diameter: Subjects increased speed in widening sections and decreased speed in narrowing sections even though stereoscopic depth information was provided. If object-based depth information (stereo, occlusion, constant average object size) is added, the confusion between narrowing and acceleration still remains but may be slightly reduced. All experiments are consistent with a simple matched filter algorithm for ego-motion detection, neglecting both parallactic and stereoscopic depth information, but leave open the possibility of cue combination at a later stage.
Immersive stereoscopic imaging requires sharp wide field images, special software, and high resolution displays.
Examples of some successful image capture, splicing, viewing, hosting, and posting techniques used in digital
stereoscopic panoramic photography are given.
Image capture uses camera movements that approximate natural eye positions reasonably well by using manual or
motorized gimbal mounted systems designed for the purpose. Processing requires seamlessly stitching dozens or
hundreds of images into left and right panoramas. Creating stereoscopic images over 50 mega pixels benefits from
programmable motorized camera mounts. The 2 gig limit of TIFFs is often exceeded and requires the use of
GigaPan.org hosting technologies. Gigapixel stereoscopic images are viewed as a single whole while many small files
are quickly uploaded to improve the sharpness of the areas viewed and may be seen at 3d-360.com. Immersive stereo contents, active scrolling and deep zoom capabilities take stereoscopic photography from snapshots
into the realm of immersive virtual presence when combined with modern web and display technologies. Scientific,
artistic, and commercial applications can make effective use of existing stereoscopic displays systems by using these
extended capabilities.
