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 Wenjun Zhang

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Average citations per article1.96
Citation Count53
Publication count27
Publication years2005-2016
Available for download1
Average downloads per article344.00
Downloads (cumulative)344
Downloads (12 Months)307
Downloads (6 Weeks)27
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27 results found Export Results: bibtexendnoteacmrefcsv

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1 published by ACM
December 2016 ACM Transactions on Information Systems (TOIS): Volume 35 Issue 3, June 2017
Publisher: ACM
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 27,   Downloads (12 Months): 307,   Downloads (Overall): 344

Full text available: PDFPDF
Identifying topic trends on microblogging services such as Twitter and estimating those topics’ future popularity have great academic and business value, especially when the operations can be done in real time. For any third party, however, capturing and processing such huge volumes of real-time data in microblogs are almost infeasible ...
Keywords: Topic detection, cost, microblogging, prediction

2
January 2012 IEEE Transactions on Image Processing: Volume 21 Issue 1, January 2012
Publisher: IEEE Press
Bibliometrics:
Citation Count: 9

In this paper, we propose a new psychovisual quality metric of images based on recent developments in brain theory and neuroscience, particularly the free-energy principle. The perception and understanding of an image is modeled as an active inference process, in which the brain tries to explain the scene using an ...

3
November 2010 IEEE Communications Letters: Volume 14 Issue 11, November 2010
Publisher: IEEE Press
Bibliometrics:
Citation Count: 4

Signal-to-leakage-and-noise ratio (SLNR) is a promising criterion for linear precoder design in multi-user (MU) multiple-input multiple-output (MIMO) systems. It decouples the precoder design problem and makes closed-form solution available. In this letter, we present a new linear precoding scheme by slightly relaxing the SLNR maximization for MU-MIMO systems with multiple ...
Keywords: signal-to-leakage-and-noise ratio (SLNR), linear precoding, multi-user MIMO

4
September 2010 PCM'10: Proceedings of the Advances in multimedia information processing, and 11th Pacific Rim conference on Multimedia: Part II
Publisher: Springer-Verlag
Bibliometrics:
Citation Count: 0

In this paper a video coding scheme with Layered Block Matching Super-resolution (LBM-SR) is presented. At the encoder side, it divides the video frames into key and non-key frames, which are encoded at original resolution and reduced resolution respectively. During the resolution reduction process, most of the high frequency information ...
Keywords: super-resolution, layered block matching, video coding

5
September 2010 Journal of Signal Processing Systems: Volume 60 Issue 3, September 2010
Publisher: Kluwer Academic Publishers
Bibliometrics:
Citation Count: 0


6
January 2010 IEEE Transactions on Image Processing: Volume 19 Issue 1, January 2010
Publisher: IEEE Press
Bibliometrics:
Citation Count: 2

In this paper, we present the design of directional lapped transforms for image coding. A lapped transform, which can be implemented by a prefilter followed by a discrete cosine transform (DCT), can be factorized into elementary operators. The corresponding directional lapped transform is generated by applying each elementary operator along ...
Keywords: Directional transform, lapped transform, image coding, directional transform

7
December 2009 IEEE Transactions on Image Processing: Volume 18 Issue 12, December 2009
Publisher: IEEE Press
Bibliometrics:
Citation Count: 8

Almost all existing color demosaicking algorithms for digital cameras are designed on the assumption of high correlation between red, green, blue (or some other primary color) bands. They exploit spectral correlations between the primary color bands to interpolate the missing color samples, but in areas of no or weak spectral ...
Keywords: color demosaicking, linear minimum mean-square estimation (LMMSE), Autoregressive model, support vector regression (SVR), autoregressive model, color saturation, digital cameras

8
November 2009 GLOBECOM'09: Proceedings of the 28th IEEE conference on Global telecommunications
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0

The poor performance of TCP in multihop ad hoc networks is mainly attributed to the inefficient interaction among different protocol layers in previous literature, while the heavy load caused by end-to-end TCP acknowledgements (ACKs) with limited information is usually ignored. In this paper, we propose a novel incorporating ACK transfer ...

9
November 2009 ICIP'09: Proceedings of the 16th IEEE international conference on Image processing
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0

Intra-predictive transforms are a kind of block-based transforms that can exploit both the intra- and inter-block correlations. This paper analyzes the coding gains of intra-predictive transforms for the Gaussian process. The tight upper bound of the coding gain is derived, which is shown to be better than both the discrete ...
Keywords: coding gain, intra-predictive transform, image coding

10
November 2009 ICIP'09: Proceedings of the 16th IEEE international conference on Image processing
Publisher: IEEE Press
Bibliometrics:
Citation Count: 2

Sparse signal representation from overcomplete dictionaries have been extensively investigated in recent research, leading to state-of-the-art results in signal, image and video restoration. One of the most important issues is involved in selecting the proper size of dictionary. However, the related guidelines are still not established. In this paper, we ...
Keywords: subtractive clustering, K-SVD, OMP, sparse representation

11
November 2009 Journal of Visual Communication and Image Representation: Volume 20 Issue 8, November, 2009
Publisher: Academic Press, Inc.
Bibliometrics:
Citation Count: 4

The existing implementations of block-shift based filtering algorithms for deblocking are hard to achieve good smoothing performance and low computation complexity simultaneously due to their fixed block size and small shifting range. In this paper, we propose to integrate quadtree (QT) decomposition with the block-shift filtering for deblocking. By incorporating ...
Keywords: Image compression, Image restoration, Quadtree decomposition, Image deblocking, Perceptual quality, Image deringing, Image post-processing, Block-shift filtering

12
September 2009 IEEE Transactions on Circuits and Systems for Video Technology: Volume 19 Issue 9, September 2009
Publisher: IEEE Press
Bibliometrics:
Citation Count: 2

A video region-of-interest (ROI) scalable coding scheme can ensure the priority of ROI. Error protection schemes can be used to guarantee the correct receipt of the ROI stream when transporting ROI scalable video over an error-prone network. However, we find that the correct receipt of ROI bitstreams cannot ensure the ...
Keywords: Error resilience, leaky prediction (LP), scalable coding, error resilience, region-of-interest (ROI)

13
August 2009 IEEE Transactions on Signal Processing: Volume 57 Issue 8, August 2009
Publisher: IEEE Press
Bibliometrics:
Citation Count: 0

This paper presents the theory and the design of intra-predictive transforms, which unify the inter-block prediction and block-based transforms in block-based image coding. Motivated by interpreting inter-block prediction as a transform with a larger size, we derive the concept of intra-predictive transforms. Conventional predictions and transforms can be viewed as ...
Keywords: Karhunen-Loève transform, Wiener prediction, Image coding, image coding, intra prediction, Karhunen–LoÈve transform

14
June 2009 ICC'09: Proceedings of the 2009 IEEE international conference on Communications
Publisher: IEEE Press
Bibliometrics:
Citation Count: 2

In most wireless relay networks, the source and relay nodes transmit successively via fixed time division (FTD) and each relay forwards a packet immediately upon receiving. In this paper we enable the buffering capability of relay nodes and propose a framework for joint scheduling and relay selection. The goal is ...

15
June 2009 Multimedia Tools and Applications: Volume 43 Issue 2, June 2009
Publisher: Kluwer Academic Publishers
Bibliometrics:
Citation Count: 1

The H.264 video compression standard supports seven variable block sizes ranging from 4�׿4 to 16�׿16 for one Macro Block (MB) with 16�׿16 size to conduct motion estimation (ME) and compensation. This new feature achieves significant coding gain at the cost of huge computation complexity. Dozens of fast mode decision algorithms ...
Keywords: Video encoder, Image edge direction, MB movement characteristic, Mode decision, Variable block size selection

16
July 2008 Image Communication: Volume 23 Issue 6, July, 2008
Publisher: Elsevier Science Inc.
Bibliometrics:
Citation Count: 7

Blocking artifact is a prevailing degradation caused by the block-based Discrete Cosine Transform (BDCT) coding technique under low bit-rate conditions. In this paper, we propose an efficient no-reference noticeable blockiness estimation algorithm for BDCT coded images. The difference on block boundaries is first measured and then transformed into the block ...
Keywords: Human visual system, Image quality assessment, Image deblocking, Just noticeable difference, Discrete cosine transforms

17
June 2008 Computer Communications: Volume 31 Issue 10, June, 2008
Publisher: Elsevier Science Publishers B. V.
Bibliometrics:
Citation Count: 2

Performance of TCP-Vegas is not satisfactory in multihop ad hoc networks over IEEE 802.11 MAC protocol. We analyze the problem with a unified network model and a TCP source window model. We observe that Vegas cannot maintain the optimal window with maximum average throughput when the network capacity is smaller ...
Keywords: Ad hoc, Throughput, DSR, TCP, Vegas

18
April 2008 IEEE Transactions on Circuits and Systems for Video Technology: Volume 18 Issue 4, April 2008
Publisher: IEEE Press
Bibliometrics:
Citation Count: 1

In most existing in-band wavelet video coding schemes, over-complete wavelet transform is used for the motion-compensated temporal filtering (MCTF) of each spatial subband. It can overcome the shift-variance of critical sampling wavelet transform and improve the coding efficiency of the in-band scheme. However, a dilemma exists in the current implementations ...
Keywords: Cross-resolution leaky prediction, mismatch error analysis, spatial scalability, wavelet video coding, Mismatch Error Analysis, Cross-resolution Leaky Prediction, In-band MCTF, Wavelet Video Coding, Spatial Scalability, in-band motion-compensated temporal filtering (MCTF)

19
March 2008 DCC '08: Proceedings of the Data Compression Conference
Publisher: IEEE Computer Society
Bibliometrics:
Citation Count: 3

This paper presents a scheme to design directional lapped transforms. Lapped transforms can be factorized into lifting steps. By introducing directional operator into each lifting step, the directional lapped transform is constructed. The directional lapped transform proposed not only preserves the advantages of lapped transforms, it also can represent directional ...

20
November 2007 Signal Processing: Volume 87 Issue 11, November, 2007
Publisher: Elsevier North-Holland, Inc.
Bibliometrics:
Citation Count: 1

Fractional pixel motion estimation is applied in H.264 to achieve more accurate motion vectors and higher compression efficiency. It, however, distinctly increased complexity in the procedure of motion estimation. In this paper, we propose an adaptive and fast fractional pixel search algorithm (AFFPS) to reduce the computation load of motion ...
Keywords: All-zero block, H.264, Fractional pixel search, Motion estimation



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