Using inter-frame dependence history to select intra-refresh blocks

Zhao, Chengji; Ngan, King Ngi; Zhang, J.; Mathew, Reji; Zhang, X.

doi:10.1049/el:20020924

Cited by 7 publications

(3 citation statements)

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“…The MPEG-4 SP codec using intra Block Refresh (IBR) is compared with the proposed approaches. The use of IBR in MPEG-4 SP improves quality in frame loss conditions [7] as shown in Table 2 but overall technique is still inferior to the PIFBP or PAFBP scheme. [8] do not add any significant improvement in quality during loss.…”

Section: Figure 9 Coding Performance For Carphonementioning

confidence: 97%

A modified video codec for MBMS applications

Praveenkumar

Kalva

Furht

2005

Proceedings of the 4th International Conference on Mobile and Ubiquitous Multimedia - MUM '05

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Multimedia Broadcast Multicast Service (MBMS) is currently being standardized by the 3GPP. The MBMS services will enable new class of applications with efficient use of spectrum. MBMS also poses a new set of requirements on video coding and delivery. In this paper we present a short overview of MBMS and a video codec designed for MBMS. The proposed video codec addresses the two key issues in video delivery over MBMS: 1) error resilience and 2) resource adaptive playback. We show that the proposed codec is simple to implement on low-resource terminals such as mobile phones and outperforms MPEG-4 SP coding under lossy conditions.

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Section: Figure 9 Coding Performance For Carphonementioning

confidence: 97%

A modified video codec for MBMS applications

Praveenkumar

Kalva

Furht

2005

Proceedings of the 4th International Conference on Mobile and Ubiquitous Multimedia - MUM '05

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“…Zhao et al [103] introduced an intra refresh scheme that is based on pixel level inter-frame dependence history. The coding mode of each pixel is tracked by the encoder.…”

Section: Intra Refreshmentioning

confidence: 99%

Efficient error concealment and error control schemes for H.264 video

Zheng¹

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In the last decade, as the demand of video transmission over communication network grows rapidly, the algorithms and technologies in video processing have significant improvement. In order to achieve good coding efficiency, the temporal and spatial redundancies in video are removed by compression schemes, such as motion compensated prediction and discrete cosine transform. On the other hand, these coding schemes make the encoded video very sensitive to the transmission error. Even single bit error in transmission may cause obvious degradation of video quality. To alleviate the effect of the transmission error, many error resilient algorithms have been developed. In this thesis, many popular error resilient algorithms have been studied, and several new error control methods are proposed for the new coding standard H.264, which supports many new video applications. There are three parts in the thesis. In Part I that includes Chapter 1 and 2, an introduction about the fundamentals of video coding is presented. The codec of H.263 is used as an example to illustrate how to compress the digital video into a bitstream. Then the new coding standard H.264 is introduced, since some new coding techniques are adopted in this coding standard. In Chapter 2, many efficient error resilient methods are reviewed.

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“…Adaptive intra refresh (AIR) adopted by MPEG-4 [1], generally performs better than intra-frame updating. Zhao et al [2] propose an intra refresh scheme based on pixel-level refresh map, which is proved to outperform AIR algorithm. Zhang et al [3] and Farber et al [4] minimize the overall distortion caused by spatial and temporal error propagation by optimally selecting the inter/intra mode for each MB in the encoder.…”

Section: Introductionmentioning

confidence: 99%