KEYWORDS: Video, Visualization, Video processing, Video coding, Volume rendering, Computer programming, 3D modeling, 3D displays, 3D video compression, Data communications
A depth dilation filter is proposed for free viewpoint video system based on mixed resolution multi-view video plus depth (MVD). By applying gray scale dilation filter to depth images, foreground regions are extended to background region, and synthesis artifacts occur out of boundary edge. Thus, objective and subjective quality of view synthesis result is improved. A depth dilation filter is applied to inloop resampling part in encoding/decoding, and post processing part after decoding. Accurate view synthesis is important in virtual view generation for autostereoscopic display, moreover there are many coding tools which use view synthesis to reduce interview redundancy in 3D video coding such as view synthesis prediction (VSP) and depth based motion vector prediction (DMVP), and compression efficiency can be improved by accurate view synthesis. Coding and synthesis experiments are performed for performance evaluation of a dilation filter with MPEG test sequences. Dilation filter was implemented on the top of the MPEG reference software for AVC based 3D video coding. By applying a depth dilation filter, BD-rate gains of 0.5% and 6.0% in terms of PSNR of decoded views and synthesized views, respectively.
KEYWORDS: Image resolution, Video, 3D displays, 3D video streaming, Image processing, Image quality, Video compression, Detection and tracking algorithms, Stereoscopic displays, Cameras
For a full motion parallax 3D display, it is necessary to supply multiple views obtained from a series of different
locations. However, it is impractical to deliver all of the required views because it will result in a huge size of
bit streams. In the previous work, authors proposed a mixed resolution 3D video format composed of color and
depth information pairs with heterogeneous resolutions, and also suggested a view synthesis algorithm for mixed
resolution videos. This paper reports a more refined view interpolation method and improved results.
KEYWORDS: Video, Video compression, 3D video compression, 3D video streaming, Data centers, Laser Doppler velocimetry, Image resolution, Video processing, Image quality, 3D displays
new 3D video format which consists of one full resolution mono video and half resolution left/right videos is proposed.
The proposed 3D video format can generate high quality virtual views from small amount of input data while preserving
the compatibility for legacy mono and frame compatible stereo video systems. The center view video is the same with
normal mono video data, but left/right views are frame compatible stereo video data. This format was tested in terms of
compression efficiency, rendering capability, and backward compatibility. Especially we compared view synthesis
quality when virtual views are made from full resolution two views or one original view and the other half resolution
view. For frame compatible stereo format, experiments were performed on interlaced method. The proposed format gives
BD bit-rate gains of 15%.
A series of psychophysical experiments using paired comparison method was performed to investigate various visual
attribute affecting image quality of a mobile display. An image quality difference model was developed to show high
correlation with visual results. The result showed that Naturalness and Clearness are the most significant attributes
among the perceptions. A colour quality difference model based on image statistics was also constructed and it was
found colour difference and colour naturalness are important attributes for predicting image colour quality difference.
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