Low-overhead content-adaptive spatial scalability for scalable video coding
J. Sel. Topics Signal Processing(2013)
摘要
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) one. Both operations, however, will cause critical visual information loss in the retargeted frames. The content-adaptive spatial scalability SVC coders (CASS-SVC) use non-homogeneous scaling to avoid critical information loss, which, however, requires to send additional side information to signal the decoder, thereby degrading coding efficiency significantly. To address the problem, we propose a low-overhead 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. Our experimental 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.
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关键词
cass-svc coder,h.264/avc,higher-resolution sequence,coding efficiency,uniform scaling,retargeted frames,side-information coder,inter-layer prediction,visual information loss,hr sequence,lr sequence,video cropping,nonhomogeneous inter-layer predictive coder,content-adaptive spatial scalability svc coders,image resolution,image segmentation,nonhomogeneous interlayer prediction coding tools,scalable extension,nonhomogeneous scaling,video shot,hr frames,panoramic mosaic,scalable video coding,low-overhead content-adaptive spatial scalability svc coder,shot-level global scaling map,video coding,image sequences,mosaic-guided video retargeter,video adaptation,prediction theory,video retargeting,spatial scalability,lower resolution sequence,low-overhead cass-svc coder,critical visual information loss,global scaling maps,low-overhead content-adaptive spatial scalability,video retargeting scheme,resized frames
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