Title :
Temporal adaptation strategies for spatio-temporal image alignment in inter-sequence error concealment of digital TV
Author :
Tröger, Tobias ; Kaup, André
Author_Institution :
Multimedia Commun. & Signal Process., Univ. of Erlangen-Nuremberg, Erlangen, Germany
Abstract :
In multi-broadcast scenarios, inter-sequence error concealment replaces lost image blocks of digital TV signals with error-free ones of low-resolution reference signals. Although single reference frames are misaligned spatio-temporally, the reconstruction quality is significantly higher than for conventional techniques. However, it can be further increased by reusing the alignment parameters of previous frames in case of misalignment of the current frame. Two strategies are proposed for this temporal adaptation of the alignment parameters either minimizing the additional complexity or maximizing the reconstruction quality. Overall, a gain of up to 5.0 dB PSNR Y is obtained while the computation time does not rise by more than 1.8%.
Keywords :
digital television; image reconstruction; image resolution; PSNR; digital TV signals; image blocks; intersequence error concealment; low-resolution reference signals; multibroadcast scenarios; reconstruction quality; single reference frames; spatio-temporal image alignment; temporal adaptation strategy; Bit rate; Digital video broadcasting; Gain; Image reconstruction; Robustness; Transforms; Videos;
Conference_Titel :
Image Processing (ICIP), 2011 18th IEEE International Conference on
Conference_Location :
Brussels
Print_ISBN :
978-1-4577-1304-0
Electronic_ISBN :
1522-4880
DOI :
10.1109/ICIP.2011.6116074