A concealment scheme for H.263 coded video transported over the Internet using the RTPUDPIP protocol

Abstract

Packet video with real-time constraints, limited bandwidth, multicast distribution, and using the RTPUDPIP protocol must take into account packet losses (with a large payload size) due to network congestion. An effective solution for packet loss is to perform concealment at the receiver. In this paper, we propose a concealment scheme for the 'I' frame missing odd or even slices that address the above problems. The proposed concealment scheme uses the previous frame macroblock (MB) or the MB motion vector (MV) with a fast motion estimation algorithm, located at the same spatial location as the missing MB. The decision between the MB or MB MV with a fast motion estimation algorithm is determined by the amount of motion between the decoded upper and lower 1 pixel wide boundary (if available) of the missing MB and the MB located in same spatial location in the previous frame. The proposed scheme produced similar peak signal to noise ratio (PSNR) results while the Central Processing Unit (CPU) time is reduced by a factor of 30 when compared to the full search concealment technique.