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18 February 2009 Temporal sub-sampling of depth maps in depth image-based rendering of stereoscopic image sequences
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Abstract
In depth image based rendering, video sequences and their associated depth maps are used to render new camera viewpoints for stereoscopic applications. In this study, we examined the effect of temporal downsampling of the depth maps on stereoscopic depth quality and visual comfort. The depth maps of four eight-second video sequences were temporally downsampled by dropping all frames, except the first, for every 2, 4, or 8 consecutive frames. The dropped frames were then replaced by the retained frame. Test stereoscopic sequences were generated by using the original image sequences for the left-eye view and the rendered image sequences for the right-eye view. The downsampled versions were compared to a reference version with full depth maps that were not downsampled. Based on the data from 21 viewers, ratings of depth quality for the downsampled versions were lower. Importantly, ratings depended on the content characteristics of the stereoscopic video sequences. Results were similar for visual comfort, except that the differences in ratings between sequences were larger. The present results suggest that more processing, such as interpolation of depth maps, might be required to counter the negative effects of temporal downsampling, especially beyond a downsampling of two.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wa James Tam, Filippo Speranza, Carlos Vázquez, and Liang Zhang "Temporal sub-sampling of depth maps in depth image-based rendering of stereoscopic image sequences", Proc. SPIE 7237, Stereoscopic Displays and Applications XX, 72371K (18 February 2009); https://doi.org/10.1117/12.807168
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