Asymmetric Video Up-sampling: A Low-Complexity Patch- Based Inter-frame Up-sampling Scheme
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Video up-sampling has received more and more research attentions as contemporary display terminal resolution becomes larger and larger. It is necessary for high-resolution display devices, such as HDTV and IPTV, to be able to generate a higher resolution video from a lower resolution one. This thesis proposes an asymmetric video up-sampling scheme and design an inter-frame up- sampling algorithm to interpolate inter frames in a low resolution video sequence with the aid of high-resolution intra frames. First, motion vectors and macroblock mode information is extracted from H.264/AVC stream. Second, each inter frame is divided into patches according to the given macroblock mode information. Third, the up-sampled patches are reconstructed by the combination of the original low-resolution patch and the corresponding high-resolution patch. Finally, we make some simple motion search around the original motion vector to obtain a refined patch, considering the accuracy of the motion vector and the loss of the residual. Experiments have been implemented to demonstrate that noticeable improvement in both objective and subjective quality are obtained. The proposed algorithm can achieve up to 4.14dB gain over bicubic interpolation and up to 3.50 dB over Zhenyu's hybrid method in PSNR with the aid of compressed high-resolution intra frames.