DocumentCode :
47169
Title :
Low-Overhead Content-Adaptive Spatial Scalability for Scalable Video Coding
Author :
Chia-Wen Lin ; Chia-Ming Tsai ; Po-Chun Chen
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Volume :
7
Issue :
6
fYear :
2013
fDate :
Dec. 2013
Firstpage :
1084
Lastpage :
1095
Abstract :
To support spatial scalability, the scalable extension of H.264/AVC (SVC) uses video cropping or uniform scaling to downscale the original higher-resolution (HR) sequence to a lower resolution (LR) sequence. Both operations, however, will cause critical visual information loss in the resized frames. To address the problem, we propose a low-overhead content-adaptive spatial scalability SVC (CASS-SVC) coder consisting of three main modules: a mosaic-guided video retargeter, a side-information coder, and a non-homogeneous inter-layer predictive coder. The proposed video retargeting scheme first constructs a panoramic mosaic for each video shot to obtain a compact shot-level global scaling map which is then used to derive the scaling maps of individual frames in the shot. The side information required for the non-homogeneous scaling, including the global scaling maps and the spatial corresponding positions of individual frames to the panoramic mosaic, are then efficiently coded by the side-information coder. The non-homogeneous interlayer prediction coding tools are used to provide good predictions to reduce the bitrates for coding the HR frames. Our simulation results demonstrate that, compared to existing CASS-SVC coders, our method cannot only well preserve subjective quality of important content in the LR sequence, but also significantly improves the coding efficiency of HR sequence.
Keywords :
image resolution; image segmentation; image sequences; prediction theory; video coding; CASS-SVC coder; H.264/AVC; HR frames; HR sequence; LR sequence; coding efficiency; critical visual information loss; global scaling maps; higher-resolution sequence; low-overhead content-adaptive spatial scalability SVC coder; lower resolution sequence; mosaic-guided video retargeter; nonhomogeneous inter-layer predictive coder; nonhomogeneous interlayer prediction coding tools; nonhomogeneous scaling; panoramic mosaic; resized frames; scalable extension; scalable video coding; shot-level global scaling map; side-information coder; uniform scaling; video cropping; video retargeting scheme; video shot; Optimization; Scalability; Spatial resolution; Video coding; Inter-layer prediction; scalable video coding; spatial scalability; video adaptation; video retargeting;
fLanguage :
English
Journal_Title :
Selected Topics in Signal Processing, IEEE Journal of
Publisher :
ieee
ISSN :
1932-4553
Type :
jour
DOI :
10.1109/JSTSP.2013.2273659
Filename :
6562765
Link To Document :
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