Novel Error Concealment Method With Adaptive Prediction to the Abrupt and Gradual Scene Changes

Abstract

In this paper, the impact of the scene change on the conventional error concealment method is addressed and a novel error concealment method is proposed to improve the insufficiency of conventional temporal error concealment algorithm due to the occurrence of scene change. Combining with the low complexity scene change detection algorithm using macroblock type information, the corrupt blocks resulting from bit errors are concealed either temporally or spatially depending on whether or not an abrupt scene change is found. In the case of gradual scene change, a novel error concealment method of interpolation and extrapolation is proposed to utilize the linear property of gradual scene change sequence, and effectively reduce the concealment error in comparison with the conventional algorithm. Great improvement about 3 to 5 dB PSNR in average and 6 to 8 dB in some cases is obtained with very little overhead memory and computation.

Realizing Video-Surveillance on Wireless Mesh Networks: Implementation Issues and Performance Evaluation

“…The distance-vector multipath networkbalancing routing algorithm is used for two reasons: first it is able to reduce delay (Vutukury & Garcia-Luna-Aceves, 2001); (Vutukury & Garcia-Luna-Aceves, 1999 -a); (Vutukury & Garcia-Luna-Aceves, 1999 -b); secondly, thanks to its multipath peculiarity, it increases the robustness of the architecture to external attacks and interceptions. In fact, if a path is (maliciously or not) shielded, or its quality is temporally degraded, all the packets flowing through it are lost; however, the application of the multipath networkbalancing routing algorithm guarantees that a high percentage of packets are able to reach the Video Decoder block, and therefore frames can be decoded, by applying an error concealment video decoding algorithm (Lee et al, 2002); (Pei & Chou, 2004); (Tsekeridou & Pitas, 2000). Mesh nodes are implemented as software routers running on low-cost computers with the Click Modular Router (Click); (Morris et al, 1999) on a Linux Platform.…”

Multipath routing and rate-controlled video encoding in wireless video surveillance networks

“…The distance-vector multipath network-balancing routing algorithm is used for two reasons: first it is able to reduce delay [25,35,36]; secondly, thanks to its multipath peculiarity, it increases the robustness of the architecture to external attacks and interceptions. In fact, if a path is shielded (maliciously or not), or its quality is temporally degraded, all the packets flowing through it are lost; however, the application of the multipath network-balancing routing algorithm guarantees that a high percentage of packets are able to reach the Video Decoder block, and therefore frames can be decoded, by applying an error concealment video decoding algorithm [37][38][39].…”

Real-Time Fade Detection in Compressed Domain

“…In order to achieve effective and efficient motion estimation and compensation inside digital videos, MPEG arranged video sequences into group of pictures (GoP), for which the structure of such arrangement can be illustrated in [8]. Inside each GoP, the MPEG video structure has the feature that there exist two B frames between every pair of I-P frames or P-P frames.…”

“…By using equation (8), examine a n to see if the frame sequences detection process should be activated or not. Following satisfaction of equation (8), then frame n belongs to the set of frames than make up the fade sequences, go to next frame with the same of Tav.…”