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IEEE Signal Processing Letters

Issue 10 • Date Oct. 2011

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Displaying Results 1 - 25 of 25
  • [Front cover]

    Publication Year: 2011, Page(s): C1
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2011, Page(s): C2
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  • Table of contents

    Publication Year: 2011, Page(s):541 - 542
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  • Hybrid Codec-Based Intra-Frame Joint Rate Control for Stereoscopic Video

    Publication Year: 2011, Page(s):543 - 546
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (618 KB) | HTML iconHTML

    An intra-frame joint rate control scheme is first proposed for a hybrid coder to encode stereoscopic video, which is based on an optimization framework with a gradient-based quadratic rate-quantization model and a gradient-based linear distortion-quantization model. The proposed rate control scheme jointly works on the left and right encoders for stereoscopic video input by controlling the output ... View full abstract»

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  • Reduced-Complexity Soft-Decision Aided Space-Time Shift Keying

    Publication Year: 2011, Page(s):547 - 550
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB) | HTML iconHTML

    In this letter, we propose to reduce the detection complexity of soft-decision aided Space-Time Shift Keying (STSK). More explicitly, we propose a vector-by-vector based STSK detector, which exhibits a lower complexity compared to the classic block-by-block based Space-Time Modulation (STM) detector. We further operate the STSK detector on a symbol-by-symbol basis, so that a near-capacity performa... View full abstract»

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  • An Efficient Switching Median Filter Based on Local Outlier Factor

    Publication Year: 2011, Page(s):551 - 554
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1330 KB) | HTML iconHTML

    An effective algorithm for removing impulse noise from corrupted images is presented under the framework of switching median filtering. Firstly, noisy pixels are distinguished by Local Outlier Factor incorporating with Boundary Discriminative Noise Detection (LOFBDND). Then, the directional weighted median filter is adopted to remove the detected impulses by replacing each noisy pixel with the wei... View full abstract»

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  • Grassmannian Subspace Prediction for Precoded Spatial Multiplexing MIMO With Delayed Feedback

    Publication Year: 2011, Page(s):555 - 558
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1282 KB) | HTML iconHTML

    In unitary precoded multi-antenna systems with delayed feedback, the quantized channel state information (CSI) may become outdated before its actual use at the transmitter. In this letter, by exploiting the geometric properties of the Grassmannian manifold, we invoke the use of Grassmannian subspace predictive coding (GSPC) to overcome this problem. Under the framework of GSPC, a novel limited fee... View full abstract»

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  • Log-Polar Based Scheme for Revealing Duplicated Regions in Digital Images

    Publication Year: 2011, Page(s):559 - 562
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (846 KB) | HTML iconHTML

    Region duplication is a common type of digital image tampering. This paper presents a log-polar based approach to detect such forgery even if the copied area has been rotated and/or scaled. We compute log-polar fast Fourier transform (LPFFT) on image blocks to approximate the log-polar Fourier transform (LPFT). LPFFT is based on a nearly log-polar system where conversion to log-polar coordinates o... View full abstract»

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  • Missing-Feature Reconstruction With a Bounded Nonlinear State-Space Model

    Publication Year: 2011, Page(s):563 - 566
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB) | HTML iconHTML

    Missing-feature reconstruction can improve speech recognition performance in unknown noisy environments. In this work, we examine using a nonlinear state-space model (NSSM) for missing-feature reconstruction and propose estimation with observed bounds to improve the NSSM performance. Evaluated in large-vocabulary continuous speech recognition task with babble and impulsive noise, using observed bo... View full abstract»

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  • Face Recognition Based on Projected Color Space With Lighting Compensation

    Publication Year: 2011, Page(s):567 - 570
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (569 KB) | HTML iconHTML

    In this letter, we propose a novel color space conversion method called adaptive projection color space (APCS). This method includes two portions: adaptive singular value decomposition and an inner product conversion algorithm for color images. We employed images from the Color FERET and CMU-PIE databases for training and experiment. The results revealed that the recognition rates from our propose... View full abstract»

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  • Modeling Rates and Distortions Based on a Mixture of Laplacian Distributions for Inter-Predicted Residues in Quadtree Coding of HEVC

    Publication Year: 2011, Page(s):571 - 574
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1082 KB) | HTML iconHTML

    Inprobability model based rate control of video coding, modeling of residual distribution is important in predicting precise distortions so as to determine appropriate quantization parameter values. For this, single probability model approaches have been popularly taken which may fail to model the underlying statistical characteristics of different residues from variable block-sized coding. In thi... View full abstract»

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  • A New Approach for Optimal Multiple Watermarks Injection

    Publication Year: 2011, Page(s):575 - 578
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1333 KB) | HTML iconHTML

    The digital imaging technology has grown explosively for multimedia applications in recent years. The need for the copyrighted digitalized media becomes urgent nowadays. An approach for the digital copyright protection is to employ advanced watermarking techniques, where watermarks can reveal the ownership identities. Generally speaking, the watermarks are embedded into image or video signals. In ... View full abstract»

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  • A DCT Approximation for Image Compression

    Publication Year: 2011, Page(s):579 - 582
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB) | HTML iconHTML

    An orthogonal approximation for the 8-point discrete cosine transform (DCT) is introduced. The proposed transformation matrix contains only zeros and ones; multiplications and bit-shift operations are absent. Close spectral behavior relative to the DCT was adopted as design criterion. The proposed algorithm is superior to the signed discrete cosine transform. It could also outperform state-of-the-... View full abstract»

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  • Vector Sampling Expansions and Linear Canonical Transform

    Publication Year: 2011, Page(s):583 - 586
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (863 KB) | HTML iconHTML

    In a vector sampling expansion (VSE), N signals bandlimited to W rad/s in the conventional Fourier domain (CFD) pass through multi-input multi-output (MIMO) linear time-invariant (LTI) systems and produce M ≥ N output bandlimited signals in the CFD. In the uniformly sampled VSE, the outputs of all the M systems are uniformly sampled at the same rate while preserving the total number of samp... View full abstract»

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  • Compressed LED Illumination Sensing

    Publication Year: 2011, Page(s):587 - 590
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (754 KB) | HTML iconHTML

    Modern day light emitting diodes (LEDs) are capable of producing high intensity light across a wide spread of frequencies. Hence, they are becoming a common ingredient in many lighting systems. In order to obtain desired lighting effects efficiently, it is important to sense the light received across different target locations and estimate the unknown properties (amplitudes, frequency offsets and ... View full abstract»

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  • A New Feedforward Hybrid Active Noise Control System

    Publication Year: 2011, Page(s):591 - 594
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (810 KB) | HTML iconHTML

    Performance of the conventional broadband active noise control (ANC) system may degrade severely if its primary and reference noise signals contain both wideband and narrowband components simultaneously. In this letter, we propose a new feedforward hybrid ANC system capable of reducing such primary noise signals. First, typical simulation results are provided to show the performance deterioration ... View full abstract»

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  • On Variable Density Compressive Sampling

    Publication Year: 2011, Page(s):595 - 598
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1161 KB) | HTML iconHTML

    Incoherence between sparsity basis and sensing basis is an essential concept for compressive sampling. In this context, we advocate a coherence-driven optimization procedure for variable density sampling. The associated minimization problem is solved by use of convex optimization algorithms. We also propose a refinement of our technique when prior information is available on the signal support in ... View full abstract»

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  • Gaussian Specific Compensation for Channel Distortion in Speech Recognition

    Publication Year: 2011, Page(s):599 - 602
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (765 KB) | HTML iconHTML

    Channel distortion is one of the major factors degrading the performance of automatic speech recognition (ASR) systems. Most of the current compensation methods rely on the assumption that the channel distortion remains unchanged within an utterance or globally. However, we show in this letter that the distortion varies over speech frames even if the channel response is unchanged. To address this ... View full abstract»

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  • Unsharp Masking Sharpening Detection via Overshoot Artifacts Analysis

    Publication Year: 2011, Page(s):603 - 606
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (687 KB) | HTML iconHTML

    In this letter, we propose a new method in detecting unsharp masking (USM) sharpening operation in digital images. Overshoot artifacts are found to occur around side-planar edges in the sharpened images. Such artifacts, measured by a sharpening detector, can serve as a rather unique feature for identifying the previous performance of sharpening operation. Test results on photograph images with reg... View full abstract»

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  • Hourly Traffic Forecasts Using Interacting Multiple Model (IMM) Predictor

    Publication Year: 2011, Page(s):607 - 610
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1021 KB) | HTML iconHTML

    Accurate and timely forecasting of traffic status is crucial to effective management of intelligent transportation systems (ITS). An interacting multiple model (IMM) predictor is proposed to forecast travel time index (TTI) data in the letter. To the best of our knowledge, it is the first time to propose the novel combined predictor. Seven baseline individual predictors are selected as combination... View full abstract»

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  • Resolution Improvement of Infrared Images Using Visible Image Information

    Publication Year: 2011, Page(s):611 - 614
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1742 KB) | HTML iconHTML

    This letter presents a new framework for improving the spatial resolution of infrared (IR) images based on the high-resolution visible image information. Edge regions in an IR image, which have a strong correlation with the aligned edges in the visible image, are sharpened by using their high frequency patches, which are locally estimated from the visible image. The estimation is performed on the ... View full abstract»

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  • Blank page

    Publication Year: 2011, Page(s):615 - 616
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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2011, Page(s):617 - 618
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  • IEEE Signal Processing Society Information

    Publication Year: 2011, Page(s): C3
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  • Blank page [back cover]

    Publication Year: 2011, Page(s): C4
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Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

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Meet Our Editors

Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu