Conference Paper

Perceptual quality feedback based progressive frame-level refreshing for robust video communication

Dept. of Inf. & Comput. Sci., California Univ., Irvine, CA, USA
DOI: 10.1109/ICASSP.2004.1326526 Conference: Acoustics, Speech, and Signal Processing, 2004. Proceedings. (ICASSP '04). IEEE International Conference on, Volume: 3
Source: IEEE Xplore

ABSTRACT In this paper, we propose an encoder side error resilience technique, namely the progressive group of picture (PGOP), which is well suited for rate controlled real-time video transmission over wireless channels. The PGOP scheme can be seen as an alternative approach to the group of picture (GOP) that periodically uses intra-frames (I-frames) for low bit-rate channels. This is because: (1) the PGOP scheme is shown to completely stop error propagation in a timely manner; (2) the PGOP scheme avoids the bit rate fluctuation problem associated with I-frames by using a progressive intra-updating scheme. We use the PGOP scheme in a perceptual quality feedback framework, and apply a novel online algorithm that helps shape the bit rate and explores the maximum recovery capability of PGOP. The performance of our scheme is demonstrated in a wireless LAN environment.

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    ABSTRACT: Error resilient encoding in video communication is becoming increasingly important due to data transmission over unreliable channels. In this paper, we propose a new power- aware error resilient coding scheme based on network error probability and user expecta- tion in video communication using mobile handheld devices. By considering both image content and network conditions, we can achieve a fast recoverable and energy-efficient er- ror resilient coding scheme. More importantly, our approach allows system designers to evaluate various operating points in terms of error resilient level and energy consumption over a wide range of system operating conditions. We have implemented our scheme on an H.263 video codec algorithm, compared it with the previous AIR, GOP and PGOP cod- ing schemes, and measured energy consumption and video quality on the IPAQ and Zaurus PDAs. Our experimental results show that our approach reduces energy consumption by 34%, 24% and 17% compared with AIR, GOP and PGOP schemes respectively, while in- curring only a small fluctuation in the compressed frame size. In addition, our experimental results prove that our approach allows faster error recovery than the previous AIR, GOP and PGOP approaches. We believe our error resilient coding scheme is therefore eminently applicable for video communication on energy-constrained wireless mobile handheld de- vices.
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    [Show abstract] [Hide abstract]
    ABSTRACT: Error resilient encoding in video communication is becoming increasingly important due to data transmission over unreliable channels. In this paper, we propose a new power-aware error resilient coding scheme based on network error probability and user expectation in video communication using mobile handheld devices. By considering both image content and network conditions, we can achieve a fast recoverable and energy-efficient error resilient coding scheme. More importantly, our approach allows system designers to evaluate various operating points in terms of error resilient level and energy consumption over a wide range of system operating conditions. We have implemented our scheme on an H.263 video codec algorithm, compared it with the previous AIR, GOP and PGOP coding schemes, and measured energy consumption and video quality on the IPAQ and Zaurus PDAs. Our experimental results show that our approach reduces energy consumption by 34%, 24% and 17% compared with AIR, GOP and PGOP schemes respectively, while incurring only a small fluctuation in the compressed frame size. In addition, our experimental results prove that our approach allows faster error recovery than the previous AIR, GOP and PGOP approaches. We believe our error resilient coding scheme is therefore eminently applicable for video communication on energy-constrained wireless mobile handheld devices.
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    ABSTRACT: The provision of real-time low-latency video appli-cations (e.g., interactive video tele-conferencing) over a wireless network is a significant research challenge. In this paper, we propose an encoder side error-resilient scheme (PGOP), by which we can stop the temporal error propagation in a progressive manner such that the constraint of encoder buffer delay can be satisfied. We compare the refreshing capability of our scheme to the well-known group of picture (GOP) scheme: with an equivalent refreshing capability, the PGOP scheme out-performs the GOP scheme in the low-latency scenario, showing better spatial and temporal quality for both frame-level and macroblock-level rate control modes. Furthermore, PGOP shows a significant decoding qual-ity gain over GOP in a simulated wideband code divi-sion multiple access mobile network.