Error resilient video transcoding for robust inter-network communications using GPRS

A novel fully comprehensive mobile video communications system is proposed in this paper. This system exploits the useful rate management features of the video transcoders and combines them with error resilience for transmissions of coded video streams over general packet radio service (GPRS) mobileaccess networks. The error-resilient video transcoding operation takes place at a centralized point, referred to as a video proxy, which provides the necessary output transmission rates with the required amount of robustness. With the use of this proposed algorithm, error resilience can be added to an already compressed video stream at an intermediate stage at the edge of two or more different networks through two resilience schemes, namely the adaptive intra refresh (AIR) and feedback control signaling (FCS) methods. Both resilience tools impose an output rate increase which can also be prevented with the proposed novel technique in this paper. Thus, an error-resilient video transcoding scheme is presented to give robust video outputs at near target transmission rates that only require the same number of GPRS timeslots as the nonresilient schemes. Moreover, an ultimate robustness is also accomplished with the combination of the two resilience algorithms at the video proxy. Extensive computer simulations demonstrate the effectiveness of the proposed system

Adaptive header compression techniques for mobile multimedia networks

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Use of prioritised object-oriented video coding for the provision of multiparty video communications in error-prone environments

Mobile communication channels are time-varying with respect to the available throughput and error conditions. This paper presents a centralised unicast architecture for use in multiparty communications. It is proposed to use object-oriented video coding to implement video prioritisation schemes and experiments are carried out to determine the perceptual quality improvements that can be achieved by varying the allocation of available source and channel protection bits to different video objects. Scene segmentation is also presented as a tool for increasing the throughput efficiency when transmitting encoded videoconferencing scene

Use of prioritised object-oriented video coding for the provision of multiparty video communications in error-prone environments

Mobile communication channels are time-varying with respect to the available throughput and error conditions. This paper presents a centralised unicast architecture for use in multiparty communications. It is proposed to use object-oriented video coding to implement video prioritisation schemes and experiments are carried out to determine the perceptual quality improvements that can be achieved by varying the allocation of available source and channel protection bits to different video objects. Scene segmentation is also presented as a tool for increasing the throughput efficiency when transmitting encoded videoconferencing scene