# IEEE Signal Processing Letters

## Filter Results

Displaying Results 1 - 25 of 27
• ### [Front cover]

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

Publication Year: 2011, Page(s): C2
| PDF (36 KB)

Publication Year: 2011, Page(s):617 - 618
| PDF (164 KB)
• ### Recursive Bayesian Control of Multichannel Acoustic Echo Cancellation

Publication Year: 2011, Page(s):619 - 622
Cited by:  Papers (10)
| | PDF (930 KB) | HTML

We present a novel recursive Bayesian method in the DFT-domain to address the multichannel acoustic echo cancellation problem. We model the echo paths between the loudspeakers and the near-end microphone as a multichannel random variable with a first-order Markov property. The incorporation of the near-end observation noise, in conjunction with the multichannel Markov model, leads to a multichanne... View full abstract»

• ### A Widely Linear Complex Unscented Kalman Filter

Publication Year: 2011, Page(s):623 - 626
Cited by:  Papers (22)
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Conventional complex valued signal processing algorithms assume rotation invariant (circular) signal distributions, and are thus suboptimal for real world processes which exhibit rotation dependent distributions (noncircular). In nonlinear sequential state space estimation, noncircularity can arise from the data, state transition model, and state and observation noises. We provide further insight ... View full abstract»

• ### Tagged Visual Cryptography

Publication Year: 2011, Page(s):627 - 630
Cited by:  Papers (12)
| | PDF (1002 KB) | HTML

This letter presents a method for implementing visual cryptography (VC) in which an additional tag is attached to each generated share. The proposed (t, n), 2 ≤ t ≤ n tagged visual cryptography (TVC) scheme works like a traditional VC scheme does, where the original image is encoded in n shares in such a way that the secret can be revealed by superi... View full abstract»

• ### A Texture-Aware Salient Edge Model for Image Retargeting

Publication Year: 2011, Page(s):631 - 634
Cited by:  Papers (12)
| | PDF (902 KB) | HTML

Image retargeting aims at adapting a given image to fit the size of arbitrary displays without severe visual distortions. To achieve this task successfully, it is essential to define a reliable image importance map (IIM) since it guides subsequent retargeting procedures. In this letter, we introduce a novel IIM for effective image retargeting. Specifically, we define our IIM by exploiting the high... View full abstract»

• ### Maximizing the Sum-Rate of Amplify-and-Forward Two-Way Relaying Networks

Publication Year: 2011, Page(s):635 - 638
Cited by:  Papers (18)
| | PDF (1310 KB) | HTML

This letter addresses the problem of beamforming design for an amplify-and-forward (AF) based two-way relaying network (TWRN) which consists of two terminal nodes and several relay nodes. Considering a two-time-slot relaying scheme, we design the optimal beamforming coefficients to maximize the sum-rate of AF-based TWRN under total relay power constraint (TRPC). Although the optimization problem i... View full abstract»

• ### Fast and Robust Circular Object Detection With Probabilistic Pairwise Voting

Publication Year: 2011, Page(s):639 - 642
Cited by:  Papers (18)
| | PDF (701 KB) | HTML

Accurate and efficient detection of circular objects in images is a challenging computer vision problem. Existing circular object detection methods can be broadly classified into two categories: voting based and maximum likelihood estimation (MLE) based. The former is robust to noise, however its computational complexity and memory requirement are high. On the other hand, MLE based methods (e.g., ... View full abstract»

• ### Tensor Locally Linear Discriminative Analysis

Publication Year: 2011, Page(s):643 - 646
Cited by:  Papers (12)
| | PDF (1217 KB) | HTML

This letter presents a Tensor Locally Linear Discriminative Analysis (TLLDA) method for image presentation. TLLDA is originated from the Local Fisher Discriminant Analysis (LFDA), but TLLDA offers some advantages over LFDA. 1) TLLDA can preserve the local discriminative information of image data as LFDA. 2) TLLDA represents images as matrices or 2-order tensors rather than vectors, so TLLDA keeps ... View full abstract»

• ### Decentralized Coordinated Downlink Beamforming via Primal Decomposition

Publication Year: 2011, Page(s):647 - 650
Cited by:  Papers (30)
| | PDF (975 KB) | HTML

This letter considers the design problem of coordinated downlink minimum power beamforming for a multiuser multi-cell network, where each multi-antenna base station (BS) serves multiple single antenna users. We propose a decentralized primal decomposition based algorithm where limited amount of information is exchanged between coupled BSs at each iteration. Algorithm converges to the globally opti... View full abstract»

• ### Constant-Time Filtering Using Shiftable Kernels

Publication Year: 2011, Page(s):651 - 654
Cited by:  Papers (13)
| | PDF (1214 KB) | HTML

It was recently demonstrated in that the nonlinear bilateral filter can be efficiently implemented using a constant-time or O(1) algorithm. At the heart of this algorithm was the idea of approximating the Gaussian range kernel of the bilateral filter using trigonometric functions. In this letter, we explain how the idea in can be extended to few other linear and nonlinear filters . While so... View full abstract»

• ### A New Algorithm for Real Data Convolutions With $j$-Circulants

Publication Year: 2011, Page(s):655 - 658
| | PDF (494 KB) | HTML

A new algorithm for efficient linear convolution of real signals is presented. It is shown that the circulant required in traditional overlap-and-save (OLS) and overlap-and-add (OLA) methods can be substituted by a j-circulant, that is, a circulant matrix where the shifted elements are multiplied by the imaginary unit. Such j-circulant can be implemented easily and efficiently with h... View full abstract»

• ### An Adaptive Diffusion Augmented CLMS Algorithm for Distributed Filtering of Noncircular Complex Signals

Publication Year: 2011, Page(s):659 - 662
Cited by:  Papers (19)
| | PDF (1167 KB) | HTML

An adaptive diffusion augmented complex least mean square (D-ACLMS) algorithm for collaborative processing of the generality of complex signals over distributed networks is proposed. The algorithm enables the estimation of both second order circular (proper) and noncircular (improper) signals within a unified framework of augmented complex statistics. The analysis shows that the performance advant... View full abstract»

• ### Dictionaries Construction Using Alternating Projection Method in Compressive Sensing

Publication Year: 2011, Page(s):663 - 666
Cited by:  Papers (4)
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This letter introduces a novel algorithm to construct sensing and measurement dictionaries in compressive sensing using alternating projection method. The cumulative and mutual cross coherence of the constructed dictionaries are lower than those of Gaussian random dictionary. The concept of General Restricted Isometry Constant (GRIC) is introduced. Low cumulative cross coherence puts bound on GRIC... View full abstract»

• ### Probability Density of Weight Deviations Given Preceding Weight Deviations for Proportionate-Type LMS Adaptive Algorithms

Publication Year: 2011, Page(s):667 - 670
Cited by:  Papers (1)
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In this work, the conditional probability density function of the current weight deviations given the preceding weight deviations is generated for a wide array of proportionate type least mean square algorithms. The conditional probability density function is derived for colored input signals when noise is present as well as when noise is absent. Additionally, the marginal conditional probability ... View full abstract»

• ### Timing Acquisition for Bandlimited Long-Code DS-CDMA in Doubly-Selective Fading Channels

Publication Year: 2011, Page(s):671 - 674
Cited by:  Papers (2)
| | PDF (1407 KB) | HTML

The code timing acquisition problem of bandlimited long-code based DS-CDMA systems operating in doubly-selective time-varying multipath channels is considered. We extend the unstructured schemes proposed by Buzzi to long-code spreading, which first estimates the Symbol Weighted Composite Channel Impulse Response (SW-CCIR) vectors and then extracts the timing informations. We also propose novel str... View full abstract»

• ### Colored Noise Based Multicondition Training Technique for Robust Speaker Identification

Publication Year: 2011, Page(s):675 - 678
Cited by:  Papers (9)
| | PDF (745 KB) | HTML

This letter proposes a colored noise based multicondition training technique for robust speaker identification in unknown noisy environments. The colored noise samples generation is based on filtering a white Gaussian sequence that leads to a power spectral density (PSD) proportional to 1/fβ, where β ∈ [0, 2]. Gaussian mixture models (GMM) are applied to obta... View full abstract»

• ### Fingerprint Singular Point Detection Based on Multiple-Scale Orientation Entropy

Publication Year: 2011, Page(s):679 - 682
Cited by:  Papers (5)
| | PDF (974 KB) | HTML

This letter develops a novel method for fingerprint singular point detection based on a new singularity representation of ridge-valley region called orientation entropy. The candidate singular point is obtained by the multiple-scale analysis of orientation entropy and some post processing steps are proposed to filter the spurious core and delta points. An iteration compensation scheme is proposed ... View full abstract»

• ### Efficient Learning of Sample-Specific Discriminative Features for Scene Classification

Publication Year: 2011, Page(s):683 - 686
Cited by:  Papers (7)
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Learning the sample-specific discriminative features based on numerous local learning may not scale well to real world scene classification tasks and suffer from the risk of overfitting. Hence we cast it in SVM based localized multiple kernel learning framework, and design a new strategy to alternately optimize the standard SVM solver and the sample-specific kernel weights, by either a linear prog... View full abstract»

• ### Fast Radix-2 Algorithm for the Discrete Hartley Transform of Type II

Publication Year: 2011, Page(s):687 - 689
Cited by:  Papers (9)
| | PDF (623 KB) | HTML

We present a new efficient method for the computation of the discrete Hartley transform of type II and radix-2 length N=2n. This recursive method requires a reduced number of arithmetic operations compared with existing methods and can be easily implemented. A new efficient method for the direct computation of a length N type-II DHT from two adjacent DHT-II sequences of length N/2 is... View full abstract»

• ### Visual Conspicuity Index: Spatial Dissimilarity, Distance, and Central Bias

Publication Year: 2011, Page(s):690 - 693
Cited by:  Papers (8)
| | PDF (603 KB) | HTML

We propose an image conspicuity index that combines three factors: spatial dissimilarity, spatial distance and central bias. The dissimilarity between image patches is evaluated in a reduced dimensional principal component space and is inversely weighted by the spatial separations between patches. An additional weighting mechanism is deployed that reflects the bias of human fixations towards the i... View full abstract»

• ### Improved Block Truncation Coding Using Extreme Mean Value Scaling and Block-Based High Speed Direct Binary Search

Publication Year: 2011, Page(s):694 - 697
Cited by:  Papers (6)
| | PDF (2114 KB) | HTML

Block truncation coding (BTC) has been considered as an efficient compression technique for decades. However, the annoying blocking effect and false contour caused by low bit rate configuration are key problems. To solve these problems, many former halftoning-based BTCs are proposed. However, these schemes also induce another impulse noise issue while the previous issues still have room for improv... View full abstract»

• ### Blank page

Publication Year: 2011, Page(s): 698
| PDF (5 KB)
• ### IEEE Signal Processing Letters Information for authors

Publication Year: 2011, Page(s):699 - 700
| PDF (143 KB)

## 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.

Full Aims & Scope

## Meet Our Editors

Editor-in-Chief
James E. Fowler
Dept Electrical & Computer Engineering
Associate Director
Distributed Analytics and Security Institute
Mississippi State University
Mississippi State, MS 39762 USA
fowler@ece.msstate.edu