Bi-directionady motion-compensated frame-rate up-conversion for H.264/AVC decoders

Alfonso, Daniele; Bagni, Daniele; Moglia, Daniele

doi:10.1109/elmar.2005.193636

Cited by 7 publications

(9 citation statements)

References 6 publications

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“…At the decoder, the side information is generated from the key frames using temporal interpolation based on Motion Compensated (MC) interpolation with symmetric motion vectors [28]. As explained earlier, the parity bits are used to recover the bitplanes of the wavelet transform of the WZ frames from those of the side-information.…”

Section: Wyner-ziv Wavelet Domain Schemementioning

confidence: 99%

Performance evaluation of wavelet-based distributed video coding schemes

Bernardini

Rinaldo

Vitali

et al. 2009

SIViP

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In this paper we propose and compare different distributed video coding (DVC) schemes based on the use of the wavelet transform, which naturally allows for spatial and other forms of scalability. In particular, we propose a hybrid encoder which utilizes channel codes, and evaluate its performance in the absence of a feedback channel. The proposed scheme uses statistical models for the estimation of the required bitrate at the encoder. We also propose a scheme that is based on a modulo reduction procedure and does not use channel codes at the receiver/transmitter. These schemes are compared with more conventional coders that do not or only partially exploit the distributed coding paradigm. Experimental results show that the considered schemes have good performance when compared with similar asymmetric video compression schemes, and that DVC can be an interesting option in appropriate scenarios.

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Section: Wyner-ziv Wavelet Domain Schemementioning

confidence: 99%

Performance evaluation of wavelet-based distributed video coding schemes

Bernardini

Rinaldo

Vitali

et al. 2009

SIViP

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“…In addition, a weighted zero MV method was proposed to keep consistency of MVs in background regions by giving favors into zero MVs [6,7]. Moglia et al [16] proposed a bi-directional ME which improves the accuracy of motion estimation with backward and forward frames. This FRU algorithm performs forward motion estimation to estimate an initial interpolated frame from the (t) frame to the (t -1) frame.…”

Section: Conventional Fru Algorithmsmentioning

confidence: 99%

“…Many FRU algorithms have been developed, and they can be classified into two categories [3,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. One approach employs frame repetition or linear interpolation regardless of object motion.…”

Section: Introductionmentioning

confidence: 99%

Confidence-based adaptive frame rate up-conversion

Min

Sim

2013

EURASIP J. Adv. Signal Process.

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In this article, we propose a new frame rate up-conversion (FRU) method for temporal quality enhancement. The proposed FRU algorithm employs gradual and adaptive motion estimation based on confidence priority for selecting more accurate motion vectors (MVs). In order to estimate accurate MVs, we adaptively alternate a search range and the order of blocks to be searched depending on the confidence level in hierarchical motion estimation. The precedence of the proposed algorithm is conducted based on the confidence level that is decided by the complexity of pixel values in a block. In addition, we perform bi-directional motion compensation and spatial linear interpolation to fill occlusion regions. In our experiments, we found that the proposed algorithm is about 2 dB better than several conventional methods. Furthermore, block artifacts and blur artifacts are significantly diminished by the proposed algorithm.

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“…Using different puncturing schemes, it is possible to send incremental subsets of parity bits, thus allowing to vary the protection offered by the coder to the bitstream. At the decoder, the side information is generated from the Key frames using temporal interpolation based on Motion Compensated (MC) interpolation with symmetric motion vectors (34). The purpose of this procedure is to reconstruct at the receiver a good approximation of each WZ frame, which will be used by the decoder as side information.…”

Section: Wyner-ziv Wavelet Domain Schemementioning

confidence: 99%

“…In our implementation we use the low complexity coder presented in (37), but other choices are possible; 3) at the receiver, maximum likelihood (ML) decoding of X from quantized X and side information Y. As before, the side information Y is generated by temporal interpolation based on Motion Compensated (MC) interpolation with symmetric motion vectors (34). In (4) it is discussed how to choose M to guarantee the recovery of X, after detailing the reconstruction procedure.…”

Section: Dvc Via Modulo Reductionmentioning

confidence: 99%

Distributed Video Coding: Principles and Evaluation of Wavelet-Based Schemes

Bernardini¹,

Rinaldo²,

Zontone³

2011

Effective Video Coding for Multimedia Applications

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3. a presentation of some original work by the authors on the design and evaluation of wavelet-based video coding;4. an overview of applications of the DVC paradigm to other aspects besides video coding. In particular, we will present results relative to robust transmission of video using an auxiliary DVC stream;5. conclusions, advantages and limitations of the DVC paradigm.In particular, we will introduce an original distributed video coder based on processing the wavelet transform with a modulo-reduction function. The reduced wavelet coefficients are compressed with a wavelet coder. At the receiver side, the statistical properties between similar frames are used to recover the compressed frame. A second contribution is the analysis and the comparison of DVC schemes in two different scenarios: in the first scenario the information frames are separated from the other frames, and they are compressed following the original framework considered for Wyner-Ziv coding. In the second scenario, all the frames are available at the encoder making this an interesting proposal for the design of a low-complexity video coder, with no motion compensation, where the information frames are coded using DSC techniques. The whole set of experiments show that the proposed schemes -that do not use any feedback channel -have good performance when compared to similar asymmetric video compression schemes considered in the literature. Finally, we will consider an original error-resilient scheme that employs distributed video coding tools. A bitstream, produced by any standard motion-compensated predictive codec, is sent over an error-prone channel. A Wyner-Ziv encoded auxiliary bitstream is sent as redundant information to serve as a forward error correction code. We propose the use of an extended version of the Recursive Optimal per-Pixel Estimate (ROPE) algorithm to establish how many parity bits should be sent to the decoder in order to correct the decoded and concealed frames. At the decoder side, error concealed reconstructed frames and parity bits are used by the Wyner-Ziv decoder, and each corrected frame is used as a reference by future frames, thus reducing drift. Tests with video sequences and realistic loss patterns are reported. Experimental results show that the proposed scheme performs well when compared to other schemes that use Forward Error Correcting (FEC) codes or the H.264 standard intra-macroblock refresh procedure. Foundation of Distributed Source CodingIn this section we will introduce in detail two major results provided by Information Theory that prove that, under the DSC paradigm, it is still possible to achieve or to approach, in total generality, the optimal performance of a joint coder: the Slepian-Wolf theorem and the Wyner-Ziv theorem. We first introduce the main ideas behind distributed source coding by means of examples. A glimpse at Distributed Source CodingConsider the case of N distributed sensors that communicate with a data collection center using a radio link. Data recorded by each sensor, at each t...

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Bi-directionady motion-compensated frame-rate up-conversion for H.264/AVC decoders

Cited by 7 publications

References 6 publications

Performance evaluation of wavelet-based distributed video coding schemes

Performance evaluation of wavelet-based distributed video coding schemes

Confidence-based adaptive frame rate up-conversion

Distributed Video Coding: Principles and Evaluation of Wavelet-Based Schemes

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