Articles

Wafer Defect Detection Using Directional Morphological Gradient Techniques

Accurate detection and classification of wafer defects constitute an important component of the IC production process because together they can immediately improve the yield and also provide information needed...

Authors: Gongyuan Qu, Sally L. Wood and Cho Teh

Spatial and Spectral Methods for Weed Detection and Localization

This study concerns the detection and localization of weed patches in order to improve the knowledge on weed-crop competition. A remote control aircraft provided with a camera allowed to obtain low cost and re...

Authors: Jean-Baptiste Vioix, Jean-Paul Douzals, Frédéric Truchetet, Louis Assémat and Jean-Philippe Guillemin

A Multiagent System for Edge Detection and Continuity Perception on Fish Otolith Images

We present an algorithm for fish otolith growth ring detection using a multiagent system. Up to now, the identification of growth rings, for age estimation, is routinely achieved by human readers, but this tas...

Authors: Anne Guillaud, Herve Troadec, Abdesslam Benzinou, Jean Le Bihan and Vincent Rodin

Visual Inspection of Machined Metallic High-Precision Surfaces

This paper presents a surface inspection prototype of an automatic system for precision ground metallic surfaces, in this case bearing rolls. The surface reflectance properties are modeled and verified with op...

Authors: Franz Pernkopf and Paul O'Leary

Combined Frequency and Spatial Domain Algorithm for the Removal of Blocking Artifacts

A novel combined frequency and spatial domain method is presented in this paper for blockiness reduction for low bit rate compressed images. The method consists of two stages: in the first, better estimates of...

Authors: George A. Triantafyllidis, Dimitrios Tzovaras, Demetrios Sampson and Michael G. Strintzis

Temporal Segmentation of MPEG Video Streams

Many algorithms for temporal video partitioning rely on the analysis of uncompressed video features. Since the information relevant to the partitioning process can be extracted directly from the MPEG compresse...

Authors: Janko Calic and Ebroul Izquierdo

B-Spline Active Contour with Handling of Topology Changes for Fast Video Segmentation

This paper deals with video segmentation for MPEG-4 and MPEG-7 applications. Region-based active contour is a powerful technique for segmentation. However most of these methods are implemented using level sets...

Authors: Frederic Precioso and Michel Barlaud

A Standard-Compliant Virtual Meeting System with Active Video Object Tracking

This paper presents an H.323 standard compliant virtual video conferencing system. The proposed system not only serves as a multipoint control unit (MCU) for multipoint connection but also provides a gateway f...

Authors: Chia-Wen Lin, Yao-Jen Chang, Chih-Ming Wang, Yung-Chang Chen and Ming-Ting Sun

Tracking of Objects in Video Scenes with Time Varying Content

We propose a method for tracking of objects contained in video sequences. Each video object is represented by a set of polygonal regions. A bottom up approach (spatial segmentation/motion estimation) is applie...

Authors: Amal Mahboubi, Jenny Benois-Pineau and Dominique Barba

A 3-Step Algorithm Using Region-Based Active Contours for Video Objects Detection

We propose a 3-step algorithm for the automatic detection of moving objects in video sequences using region-based active contours. First, we introduce a very full general framework for region-based active cont...

Authors: Stéphanie Jehan-Besson, Michel Barlaud and Gilles Aubert

An Active Model for Facial Feature Tracking

We present a system for finding and tracking a face and extract global and local animation parameters from a video sequence. The system uses an initial colour processing step for finding a rough estimate of th...

Authors: Jörgen Ahlberg

A Novel Hexagonal Search Algorithm for Fast Block Matching Motion Estimation

Based on real-world image sequence characteristics of center-biased motion vector distribution, a Hexagonal (HS) algorithm with center-biased checking point pattern for fast block motion estimation is proposed...

Authors: Anastasios Hamosfakidis and Yakup Paker

Capacity Analysis Based on Using Adaptive Antenna Arrays Jointly Optimized for Trunking and Spatial Efficiency

Cellular systems using adaptive antennas for spatial processing have been shown to provide an increase in capacity. When employing adaptive antennas, the standard approach to achieve capacity gain has been to ...

Authors: Ivan Howitt and Fahed H. Awad

A Survey of Watermarking Algorithms for Image Authentication

Digital image manipulation software is now readily available on personal computers. It is therefore very simple to tamper with any image and make it available to others. Insuring digital image integrity has th...

Authors: Christian Rey and Jean-Luc Dugelay

Editorial

Authors: Moncef Gabbouj, Faouzi Alaya Cheikh, Bogdan Cramariuc and Geoff Morrison

Low-Complexity Iterative Receiver for Space-Time Coded Signals over Frequency Selective Channels

We propose a low-complexity turbo-detector scheme for frequency selective multiple-input multiple-output channels. The detection part of the receiver is based on a List-type MAP equalizer which is a state-redu...

Authors: Noura Sellami, Inbar Fijalkow and Mohamed Siala

Editorial

Authors: Dirk Slock, Vahid Tarokh and Xiang-Gen Xia

Maximum Likelihood Blind Channel Estimation for Space-Time Coding Systems

Sophisticated signal processing techniques have to be developed for capacity enhancement of future wireless communication systems. In recent years, space-time coding is proposed to provide significant capacity...

Authors: Hakan A. Çırpan, Erdal Panayırcı and Erdinc Çekli

Linear Equalization Combined with Multiple Symbol Decision Feedback Detection for Differential Space-Time Modulation

Differential space-time modulation (DSTM) for multiple antenna communication systems has been recently proposed for frequency-nonselective fading channels. In broadband multirate systems, frequency-selective f...

Authors: Genyuan Wang, Aijun Song and Xiang-Gen Xia

Space-Time Trellis Coded 8PSK Schemes for Rapid Rayleigh Fading Channels

This paper presents the design of 8PSK space-time (ST) trellis codes suitable for rapid fading channels. The proposed codes utilize the design criteria of ST codes over rapid fading channels. Two different app...

Authors: Salam A. Zummo and Saud A. Al-Semari

Blind Identification of Convolutive MIMO Systems with 3 Sources and 2 Sensors

We address the problem of blind identification of a convolutive Multiple-Input Multiple-Output (MIMO) system with more inputs than outputs, and in particular, the 3-input 2-output case. We assume that the inpu...

Authors: Binning Chen, Athina P. Petropulu and Lieven De Lathauwer

Pilot-Symbol-Assisted Channel Estimation for Space-Time Coded OFDM Systems

Space-time coded orthogonal frequency division multiplexing (OFDM) transmitter diversity techniques have been shown to provide an efficient means of achieving near optimal diversity gain in frequency-selective...

Authors: King F. Lee and Douglas B. Williams

Space-Time Turbo Trellis Coded Modulation for Wireless Data Communications

This paper presents the design of space-time turbo trellis coded modulation (ST turbo TCM) for improving the bandwidth efficiency and the reliability of future wireless data networks. We present new recursive ...

Authors: Welly Firmanto, Branka Vucetic, Jinhong Yuan and Zhuo Chen

On the Capacity of Certain Space-Time Coding Schemes

We take a capacity view of a number of different space-time coding (STC) schemes. While the Shannon capacity of multiple-input multiple-output (MIMO) channels has been known for a number of years now, the atta...

Authors: Constantinos B. Papadias and Gerard J. Foschini

Deterministic Blind Subspace MIMO Equalization

A subspace based approach for the blind multiple signal separation and recovery for MIMO systems is proposed in this paper. Instead of using the statistics of the received signal, the proposed algorithm exploi...

Authors: Balaji Sampath, K. J. Ray Liu and Ye (Geoffrey) Li

On Some Design Issues of Space-Time Coded Multi-Antenna Systems

This paper concerns some design issues and tradeoffs of communication systems equipped with multiple transmit and receive antennas. The general space-time coding/modulation structure by Tarokh et al. (1999) is...

Authors: Hsuan-Jung Su and Evaggelos Geraniotis

Maximum-Likelihood Sequence Detection of Multiple Antenna Systems over Dispersive Channels via Sphere Decoding

Multiple antenna systems are capable of providing high data rate transmissions over wireless channels. When the channels are dispersive, the signal at each receive antenna is a combination of both the current ...

Authors: Haris Vikalo and Babak Hassibi

Audio Classification in Speech and Music: A Comparison between a Statistical and a Neural Approach

We focus the attention on the problem of audio classification in speech and music for multimedia applications. In particular, we present a comparison between two different techniques for speech/music discrimin...

Authors: Alessandro Bugatti, Alessandra Flammini and Pierangelo Migliorati

Segmentation and Content-Based Watermarking for Color Image and Image Region Indexing and Retrieval

In this paper, an entirely novel approach to image indexing is presented using content-based watermarking. The proposed system uses color image segmentation and watermarking in order to facilitate content-base...

Authors: Nikolaos V. Boulgouris, Ioannis Kompatsiaris, Vasileios Mezaris, Dimitrios Simitopoulos and Michael G. Strintzis

SVD-Based Optimal Filtering Technique for Noise Reduction in Hearing Aids Using Two Microphones

We introduce a new SVD-based (Singular value decomposition) strategy for noise reduction in hearing aids. This technique is evaluated for noise reduction in a behind-the-ear (BTE) hearing aid where two omnidir...

Authors: Jean-Baptiste Maj, Marc Moonen and Jan Wouters

Video Segmentation Using Fast Marching and Region Growing Algorithms

The algorithm presented in this paper is comprised of three main stages: (1) classification of the image sequence and, in the case of a moving camera, parametric motion estimation, (2) change detection having ...

Authors: Eftychis Sifakis, Ilias Grinias and Georgios Tziritas

Editorial

Authors: Moncef Gabbouj, Faouzi Alaya Cheikh, Bogdan Cramariuc and Geoff Morrison

Stand-Alone Objective Segmentation Quality Evaluation

The identification of objects in video sequences, that is, video segmentation, plays a major role in emerging interactive multimedia services, such as those enabled by the ISO MPEG- ...

Authors: Paulo Lobato Correia and Fernando Pereira

Overview of the MPEG-7 Standard and of Future Challenges for Visual Information Analysis

This paper presents an overview of the MPEG- standard: the Multimedia Content Description Interface. It focuses on visual information d...

Authors: Philippe Salembier

Objective Evaluation Criteria for 2D-Shape Estimation Results of Moving Objects

The objective evaluation of 2D-shape estimation results for moving objects in a video sequence is still an open problem. First approaches in the literature evaluate the spatial accuracy and the temporal cohere...

Authors: Roland Mech and Ferran Marqués

Using Invariant Image Features for Synchronization in Spread Spectrum Image Watermarking

A watermarking scheme is presented in which the characteristics of both spatial and frequency techniques are combined to achieve robustness against image processing and geometric transformations. The proposed ...

Authors: Ebroul Izquierdo

Using MPEG- at the Consumer Terminal in Broadcasting

The European Union IST research programme SAMBITS (System for Advanced Multimedia Broadcast and IT Services) project is using Digital Video Broadcasting (DVB), the DVB Multimedia Home Platform (MHP) standard, ...

Authors: Alan Pearmain, Mounia Lalmas, Ekaterina Moutogianni, Damien Papworth, Pat Healey and Thomas Rölleke

Ordinal-Measure Based Shape Correspondence

We present a novel approach to shape similarity estimation based on distance transformation and ordinal correlation. The proposed method operates in three steps: object alignment, contour to multilevel image t...

Authors: Faouzi Alaya Cheikh, Bogdan Cramariuc, Mari Partio, Pasi Reijonen and Moncef Gabbouj

Equalization and Decoding for Multiple-Input Multiple-Output Wireless Channels

We consider multiple-input, multiple-output (MIMO) wireless communication systems that employ multiple transmit and receive antennas to increase the data rate and achieve diversity in fading multipath channels...

Authors: Bjørn A. Bjerke and John G. Proakis

A Novel Decoder for Unknown Diversity Channels Employing Space-Time Codes

We suggest new decoding techniques for diversity channels employing space time codes (STC) when the channel coefficients are unknown to both transmitter and receiver. Most of the existing decoders for unknown ...

Authors: Elona Erez and Meir Feder

Systematic Design of Space-Time Trellis Codes for Diversity and Coding Advantages

The emerging need for high data rate wireless services has raised considerable interest in space-time coding. In this work, we propose a systematic code construction method that jointly considers diversity adv...

Authors: Zoltan Safar and K. J. Ray Liu

Editorial

Authors: Dirk Slock, Vahid Tarokh and Xiang-Gen Xia

Differential Space-Time Block Code Modulation for DS-CDMA Systems

A differential space-time block code (DSTBC) modulation scheme is used to improve the performance of DS-CDMA systems in fast time-dispersive fading channels. The resulting scheme is referred to as the differentia...

Authors: Jianhua Liu, Jian Li and Erik G. Larsson

Multiple-Symbol Decision-Feedback Space-Time Differential Decoding in Fading Channels

Space-time differential coding (STDC) is an effective technique for exploiting transmitter diversity while it does not require the channel state information at the receiver. However, like conventional differen...

Authors: Yan Liu and Xiaodong Wang

Low Complexity Receiver Structures for Space-Time Coded Multiple-Access Systems

Multiuser detection for space-time coded synchronous multiple-access systems in the presence of independent Rayleigh fading is considered. Under the assumption of quasi-static fading, it is shown that optimal ...

Authors: Sudharman K. Jayaweera and H. Vincent Poor

Channel Estimation and Optimal Power Allocation for a Multiple-Antenna OFDM System

We propose combining channel estimation and optimal power allocation approaches for a multiple-antenna orthogonal frequency division multiplexing (OFDM) system in high-speed transmission applications. We devel...

Authors: Tai-Lai Tung and Kung Yao

Space-Time Codes for Wireless Optical Communications

A space-time channel coding technique is presented for overcoming turbulence-induced fading in an atmospheric optical heterodyne communication system that uses multiple transmit and receive apertures. In parti...

Authors: Shane M. Haas, Jeffrey H. Shapiro and Vahid Tarokh

Rayleigh Fading Multi-Antenna Channels

Information theoretic properties of flat fading channels with multiple antennas are investigated. Perfect channel knowledge at the receiver is assumed. Expressions for maximum information rates and outage prob...

Authors: Alex Grant

Space-Time Turbo Coded Modulation: Design and Applications

A design method for recursive space-time trellis codes and parallel-concatenated space-time turbo coded modulation is proposed that can be applied to an arbitrary existing space-time trellis code. The method e...

Authors: Djordje Tujkovic, Markku Juntti and Matti Latva-aho

Joint Estimation and Decoding of Space-Time Trellis Codes

We explore the possibility of using an emerging tool in statistical signal processing, sequential importance sampling (SIS), for joint estimation and decoding of space-time trellis codes (STTC). First, we prov...

Authors: Jianqiu Zhang and Petar M. Djurić