24 May 1999 Stereo image quality: effects of spatio-temporal resolution
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We explored the response of the human visual system to mixed-resolution stereo video sequences in which one eye view was spatially or temporally low-pass filtered. It was expected that perceived quality, stereo depth, and perceived sharpness of sequences would be relatively unaffected by low-pass filtering, compared to the case where both eyes viewed a filtered image. Subjects viewed two 10-second stereo video-sequences, in which the right-eye frames were filtered vertically and horizontally (H) at 1/2H, 1/2V, 1/4H, 1/4V, 1/2H1/2V, 1/2H1/2V, 1/4H1/2V, and 1/4H1/4V resolution. Temporal filtering was implemented for a subset of these conditions at 1/2 temporal resolution, or with dropped-and-repeated frames. Subjects rates the overall quality, sharpness, and overall sensation of depth. It was found that spatial filtering produced acceptable results: the overall sensation of depth was unaffected by low-pass filtering, while ratings of quality and of sharpness were biased towards the eye with the greater spatial resolution. By comparison, temporal filtering produced unacceptable result: Field averaging and dropped-and-repeated frame conditions yielded images with poor quality and sharpness, even though perceived depth was relatively unaffected. We conclude that spatial filtering of one channel of a stereo video-stereo may be an effective means of reducing transmission bandwidth.
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Lew B. Stelmach, Lew B. Stelmach, Wa James Tam, Wa James Tam, Daniel V. Meegan, Daniel V. Meegan, "Stereo image quality: effects of spatio-temporal resolution", Proc. SPIE 3639, Stereoscopic Displays and Virtual Reality Systems VI, (24 May 1999); doi: 10.1117/12.349366; https://doi.org/10.1117/12.349366


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