tailieunhanh - Báo cáo hóa học: " New Hybrid Error Concealment for Digital Compressed Video"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: New Hybrid Error Concealment for Digital Compressed Video | EURASIP Journal on Applied Signal Processing 2005 12 1821-1833 2005 Hindawi Publishing Corporation New Hybrid Error Concealment for Digital Compressed Video Ofer Hadar Communication Systems Engineering Department Ben-Gurion University of the Negev Beer-Sheva 84105 Israel Email hadar@ Merav Huber Electrical and Computer Engineering Department Ben-Gurion University of the Negev Beer-Sheva 84105 Israel Email huberm@ Revital Huber Electrical and Computer Engineering Department Ben-Gurion University of the Negev Beer-Sheva 84105 Israel Email huberr@ Shlomo Greenberg Communication Systems Engineering Department Ben-Gurion University of the Negev Beer-Sheva 84105 Israel Email shlomogreenberg@ Received 2 August 2004 Revised 26 December 2004 Recommended for Publication by Reha Civanlar Transmission of a compressed video signal over a lossy communication network exposes the information to losses and errors which leads to significant visible errors in the reconstructed frames at the decoder side. In this paper we present a new hybrid error concealment algorithm for compressed video sequences based on temporal and spatial concealment methods. We describe spatial and temporal techniques for the recovery of lost blocks. In particular we develop postprocessing techniques for the reconstruction of missing or damaged macroblocks. A new decision support tree is developed to efficiently choose the best appropriate error concealment method according to the spatial and temporal characteristics of the sequence. The proposed algorithm is compared to three error concealment methods spatial temporal and a previous hybrid approach using different noise levels. The results are evaluated using four quality measures. We show that our error concealment scheme outperforms all the other three methods for all the tested video sequences. Keywords and phrases error concealment spatial temporal hybrid error concealment video coding MPEG-2 decision tree .