Results 1 - 10 of 169

Error resilient video coding using unequally protected key pictures

by Ye-kui Wang, Miska M. Hannuksela - in Proc. International Workshop VLBV03 , 2003
"... Abstract. This paper proposes the use of unequally protected key pictures to prevent temporal error propagation in error-prone video communications. The key picture may either be an intra-coded picture or a picture using a long-term motion compensation reference picture through reference picture sel ..."
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Abstract. This paper proposes the use of unequally protected key pictures to prevent temporal error propagation in error-prone video communications. The key picture may either be an intra-coded picture or a picture using a long-term motion compensation reference picture through reference picture

Error Resilient Video Coding Using B Pictures in H.264

by Mengyao Ma, Student Member, Oscar C. Au, Senior Member, S. -h. Gary Chan, Senior Member, Liwei Guo, Student Member
"... Abstract—Since the quality of compressed video is vulnerable to errors, video transmission over unreliable Internet is very challenging today. Multi-hypothesis motion-compensated prediction (MHMCP) has been shown to have error resilience capability for video transmission, where each macroblock is pr ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
picture framework in H.264/AVC also allows previously decoded B pictures to be used as references for B picture coding. In this paper, we will discuss the error resilience characteristics of the generalized B pictures in H.264/AVC. Three prediction patterns of B pictures are analyzed in terms

ERROR RESILIENT VIDEO CODING TECHNIQUES USING SPARE PICTURES

by Dong Tian, Miska M. Hannuksela, Ye-kui Wang, Moncef Gabbouj
"... In error prone environments not all the picture data can be received correctly during video transmission. Error propagation introduced by employing predictive coding may degrade the sequence quality severely. A novel method, called spare pictures, is proposed to indicate the similarity between a ref ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
In error prone environments not all the picture data can be received correctly during video transmission. Error propagation introduced by employing predictive coding may degrade the sequence quality severely. A novel method, called spare pictures, is proposed to indicate the similarity between a

RTP/AVPF Compliant Feedback for Error Resilient Video Coding in Conversational Applications

by Chenghao Liu, Ye-kui Wang, Miska M. Hannuksela, Ying Chen, Mate Sujeet, Moncef Gabbouj
"... Abstract — Feedback-based error-resilient video coding relies on efficient transmission of feedback messages. The Audio-Visual Profile with Feedback (AVPF) for Real-time Transport Control Protocol (RTCP), i.e. RTP/AVPF, supports low-latency feedbacks. In this paper, a reference picture selection (RP ..."
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Abstract — Feedback-based error-resilient video coding relies on efficient transmission of feedback messages. The Audio-Visual Profile with Feedback (AVPF) for Real-time Transport Control Protocol (RTCP), i.e. RTP/AVPF, supports low-latency feedbacks. In this paper, a reference picture selection

Video transport over ad hoc networks: Multistream coding with multipath transport

by Shiwen Mao, Student Member, Shunan Lin, Student Member, Shivendra S. Panwar, Senior Member, Yao Wang, Senior Member, Emre Celebi, Student Member - IEEE J. Sel. Areas Commun , 2003
"... Abstract—Enabling video transport over ad hoc networks is more challenging than over other wireless networks. The wireless links in an ad hoc network are highly error prone and can go down frequently because of node mobility, interference, channel fading, and the lack of infrastructure. However, the ..."
Abstract - Cited by 118 (20 self) - Add to MetaCart
, the mesh topology of ad hoc networks implies that it is possible to establish multiple paths between a source and a destination. Indeed, multipath transport provides an extra degree of freedom in designing error resilient video coding and transport schemes. In this paper, we propose to combine multistream

Error Resilient Packet-Switched Video Telephony with Adaptive Rateless Coding and Reference Picture Selection

by Muneeb Dawood, Raouf Hamzaoui, Shakeel Ahmad, Marwan Al-akaidi
"... Abstract — Providing high-quality video for packet-switched wireless video telephony on hand-held devices is a challenging task due to packet loss, limited available bandwidth, and complexity constraints. We propose a low-complexity channel-adaptive error resilience technique that combines applicati ..."
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application-layer forward error correction (FEC) with rateless codes, retransmission, and reference picture selection. Experimental results for H.264 video sequences show that the proposed technique achieves significant peak-signal-to-noise ratio (PSNR) and percentage degraded video duration (PDVD

ERROR-RESILIENT PACKET SWITCHED H.264 MOBILE VIDEO TELEPHONY WITH LT CODING AND REFERENCE PICTURE SELECTION

by Muneeb Dawood, Raouf Hamzaoui, Shakeel Ahmad, Marwan Al-akaidi
"... Packet switched video telephony over wireless networks for hand-held devices requires low-delay, low-complexity error control mechanisms to deal with packet loss. We present an efficient solution for 3G networks based on LT coding, reference picture selection, and cross-layer optimization. Experimen ..."
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Packet switched video telephony over wireless networks for hand-held devices requires low-delay, low-complexity error control mechanisms to deal with packet loss. We present an efficient solution for 3G networks based on LT coding, reference picture selection, and cross-layer optimization

Reliable Video Communication over Lossy Packet Networks using Multiple State Encoding and Path Diversity

by John Apostolopoulos - Visual Communications and Image Processing (VCIP , 2001
"... Video communication over lossy packet networks suchastheInternet is hampered by limited bandwidth and packet loss. This paper presents a system for providing reliable video communication over these networks, where the system is composed of two subsystems: (1) multiple state video encoder/decoder and ..."
Abstract - Cited by 185 (15 self) - Add to MetaCart
/decoder and (2) a path diversity transmission system. Multiple state video coding combats the problem of error propagation at the decoder by coding the video into multiple independently decodable streams, each with its own prediction process and state. If one stream is lost the other streams can still be decoded

Loss-resilient Coding of Texture and Depth for Free-viewpoint Video Conferencing

by Bruno Macchiavello, Camilo Dorea, Edson M. Hung, Gene Cheung , Wai-tian Tan , 2014
"... Free-viewpoint video conferencing allows a participant to observe the remote 3D scene from any freely chosen viewpoint. An intermediate virtual viewpoint image is typically synthesized using two pairs of transmitted texture and depth maps from two neighboring captured viewpoints via depth-image-base ..."
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the more reliable transmitted view are weighted more heavily. We then couple it with a sender-side optimiza-tion of reference picture selection (RPS) during real-time video coding, so that blocks containing pixel samples of voxels that are visible in both views are more error-resiliently coded in one view

Compressed-Domain Techniques for Error-Resilient Video Transcoding Using RPS

by Yui-lam Chan, Hoi-kin Cheung, Wan-chi Siu, Senior Member
"... Abstract—In video applications where video sequences are com-pressed and stored in a storage device for future delivery, the en-coding process is typically carried out without enough prior knowl-edge about the channel characteristics of a network. Error-resilient transcoding plays an important role ..."
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to provide an addition of re-silience to the video data, where or whenever it is needed. Recently, a reference picture selection (RPS) scheme has been adopted in an error-resilient transcoder in order to reduce error effects for the already encoded video bitstream. In this approach, the transcoder learns
Results 1 - 10 of 169