• Title/Summary/Keyword: error concealment

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A Temporal Error Concealment Technique Using Motion Adaptive Boundary Matching Algorithm

  • Kim Won Ki;Jeong Je Chang
    • Proceedings of the IEEK Conference
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    • 2004.08c
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    • pp.819-822
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    • 2004
  • To transmit MPEG-2 video on an erroneous channel, a number of error control techniques He needed. Especially, error concealment techniques which can be implemented on receivers independent of transmitters are essential to obtain good video quality. In this paper, a motion adaptive boundary matching algorithm (MA-BMA) is presented for temporal error concealment. Before carrying out BMA, we perform error concealmmt by a motion vector prediction using neighboring motion vectors. If the candidate of error concealment is rot satisfied, search range and reliable boundary pixels are selected by the motion activity or motion vectors ane a damaged macroblock is concealed by applying the MA-BMA. This error concealment technique reduces the complexity and maintains PSNR gain of 0.3 0.7dB compared to the conventional BMA.

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Video Error Concealment using Neighboring Motion Vectors (주변의 움직임 벡터를 사용한 비디오 에러 은닉 기법)

  • 임유두;이병욱
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.3C
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    • pp.257-263
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    • 2003
  • Error control and concealment in video communication is becoming increasingly important because transmission errors can cause single or multiple loss of macroblocks in video delivery over unreliable channels such as wireless networks and the internet. This paper describes a temporal error concealment by postprocessing. Lost image blocks are overlapped block motion compensated (OBMC) using median of motion vectors from adjacent blocks at the decoder. The results show a significant improvement over zero motion error concealment and other temporal concealment methods such as Motion Vector Rational Interpolation or Side Match Criterion OBMC by 1.4 to 3.5㏈ gain in PSNR. We present experimental results showing improvements in PSNR and computational complexity.

Error concealment for Low Bit Rate Video over Burst-packet-Loss Networks (다발적 패킷 손실 네트워크에서 저비트율 영상의 에러은닉)

  • 정진우;변재영;고성제
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.271-274
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    • 2003
  • This paper presents a robust error concealment method for burst-packet-loss networks. The proposed error concealment algorithm can reduce the computational complexities of the existing error concealment methods. Moreover, experimental results show that the proposed method produces the better video quality than the conventional boundary matching algorithm.

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Error Concealment Techniques for Visual Quality Improving (화질 향상을 위한 오류 은폐 기법)

  • Suh, Jae-Won
    • The Journal of the Korea Contents Association
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    • v.6 no.2
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    • pp.65-74
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    • 2006
  • The MPEG-2 video compressed bitstream is very sensitive to transmission errors due to the complex coding structure of the MPEG-2 video coding standard. If one packet is lost or received with errors, not only the current frame will be corrupted, but also errors will propagate to succeeding frames within a group of pictures. Therefore, we employ various error resilient coding/decoding techniques to protect and reduce the transmission error effects. Error concealment technique is one of them. Error concealment technique exploits spatial and temporal redundancies of the correctly received video data to conceal the corrupted video data. Motion vector recovery and compensation with the estimated motion vector is good approach to conceal the corrupted data. In this paper, we propose various error concealment algorithms based on motion vector recovery, and compare their performance to those of conventional error concealment methods.

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High-Performance Spatial and Temporal Error-Concealment Algorithms for Block-Based Video Coding Techniques

  • Hsu, Ching-Ting;Chen, Mei-Juan;Liao, Wen-Wei;Lo, Shen-Yi
    • ETRI Journal
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    • v.27 no.1
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    • pp.53-63
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    • 2005
  • A compressed video bitstream is sensitive to errors that may severely degrade the reconstructed images even when the bit error rate is small. One approach to combat the impact of such errors is the use of error concealment at the decoder without increasing the bit rate or changing the encoder. For spatial-error concealment, we propose a method featuring edge continuity and texture preservation as well as low computation to reconstruct more visually acceptable images. Aiming at temporal error concealment, we propose a two-step algorithm based on block matching principles in which the assumption of smooth and uniform motion for some adjacent blocks is adopted. As simulation results show, the proposed spatial and temporal methods provide better reconstruction quality for damaged images than other methods.

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Channel Condition Adaptive Error Concealment using Scalability Coding (채널상태에 적응적인 계층 부호화를 이용한 오류 은닉 방법 연구)

  • Han Seung-Gyun;Park Seung-Ho;Suh Doug-Young
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.1B
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    • pp.8-17
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    • 2004
  • In this paper: we propose the adaptive error concealment technique for scalable video coding over wireless network error prove environment. We prove it is very effective that Error concealment techniques proposed in this paper are applied to scalable video data. In this paper, we propose two methods of error concealment. First one is that the en·or is concealed using the motion vector of base layer and previous VOP data. Second one is that according to existence of motion vector in error position, the error is concealed using the same position data of base layer when the motion vector is existing otherwise using the same position data of previous VOP when the motion vector is 0(zero) adaptively. We show that according to various error pattern caused by condition of wireless network and characteristics of sequence, we refer decoder to base layer data or previous enhancement layer data to effective error concealment. Using scalable coding of MPEG-4 In this paper, this error concealment techniques are available to be used every codec based on DCT.

Application of watermarking to error concealment in video communications (영상통신에서의 패킷 오류 은닉에 활용되는 워터마킹 기법)

  • Oh, Tae-Suk;Kim, Yong-Cheol
    • Proceedings of the KIEE Conference
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    • 2006.04a
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    • pp.84-86
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    • 2006
  • An informed watermarking algorithm is proposed in this work that aids in concealing packet loss errors in video communications. This watermark-based error concealment(WEC) method embeds a low resolution version of the video frame inside itself as watermark data. At the receiver, the extracted watermark is used as a reference for error concealment. The proposed DCT-based algorithm has features of informed watermarking in order to minimize the distortion of the host frame. At the encoder, a predictive feedback loop Is employed which helps to adjusts the strength of the scale factor Furthermore, some of the modified coefficients of the DCT signal are virtually free from distortion by employing bit- sign adaptivity. The performance of the detector is Qualitatively analyzed for error concealment applications where full-frame DCT embedding proved to be more advantageous.

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An Error Concealment Technique for MPEG-4 Video Transmission over Wireless Networks (무선 네트워크 환경에서의 MPEG-4 비디오 전송을 위한 에러 은닉 기법)

  • Park, Jeong-Beom;Eo, Jin-Woo
    • Journal of IKEEE
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    • v.9 no.2 s.17
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    • pp.170-178
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    • 2005
  • The video data corrupted by the transmission error due to packet loss induce error propagation in decoded video data, and cause poor video quality. To remedy these corrupted video data, there have been introduced two types of error concealment techniques: spatial or temporal error concealment algorithm. Computational overhead by using spatial error concealment algorithm is a serious disadvantage in mobile video data streaming environment. In this paper, we propose hybrid type error concealment technique recovering video quality of mobile device using MPEG-4 video streaming on error-prone wireless network. Our algorithm is implemented in MPEG-4 decoder. The algorithm adopts Intel Wireless MMX technology to provide high performance of portable embedded multimedia mobile device. It is proven that the proposed algorithm shows expected performance for a mobile streaming system(PDA) on IP channels. Our approach showed better processing speed and better video quality comparing with traditional error concealment algorithm.

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Design and Implementation of Error Concealment Algorithm using Data Hiding and Adaptive Selection of Adjacent Motion Vectors (정보숨김과 주변 움직임 벡터의 적응적 선택에 의한 에러은닉 알고리즘의 설계 및 구현)

  • Lee, Hyun-Woo;Seong, Dong-Su;Lee, Keon-Bae
    • The KIPS Transactions:PartB
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    • v.13B no.6 s.109
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    • pp.607-614
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    • 2006
  • In this paper, we propose an error resilience video coder which uses a hybrid error concealment algorithm. Firstly, the algorithm uses the error concealment with data hiding. If the hiding information is lost, the motion vector of lost macroblock is computed with adaptive selection of adjacent motion vectors and OBMC (Overlapped Block Motion Compensation) is applied with this motion vector. We know our algorithm is more effective in case of continuous GOB. The results show more significant improvement than many temporal concealment methods such as MVRI (Motion Vector Rational Interpolation) or existing error concealment using data hiding.

A Temporal Error Concealment Technique Using The Adaptive Boundary Matching Algorithm (적응적 경계 정합을 이용한 시간적 에러 은닉 기법)

  • 김원기;이두수;정제창
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.5C
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    • pp.683-691
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    • 2004
  • To transmit MPEG-2 video on an errorneous channel, a number of error control techniques are needed. Especially, error concealment techniques which can be implemented on receivers independent of transmitters are essential to obtain good video quality. In this paper, prediction of motion vector and an adaptive boundary matching algorithm are presented for temporal error concealment. Before the complex BMA, we perform error concealment by a motion vector prediction using neighboring motion vectors. If the candidate of error concealment is not satisfied, search range and reliable boundary pixels are selected by the temporal activity or motion vectors and a damaged macroblock is concealed by applying an adaptive BMA. This error concealment technique reduces the complexity and maintains a PSNR gain of 0.3∼0.7㏈ compared to conventional BMA.