Articles

Real-Time Multi-Step View Reconstruction for a Virtual Teleconference System

We propose a real-time multi-step view reconstruction algorithm and we tune its implementation to a virtual teleconference application. Theoretical motivations and practical implementation issues of the algori...

Authors: B. J. Lei and E. A. Hendriks

Model-Based Real-Time Head Tracking

This paper treats real-time tracking of a human head using an analysis by synthesis approach. The work is based on the Structure from Motion (SfM) algorithm from Azarbayejani and Pentland (1995). We will analy...

Authors: Jacob Ström

Three-Dimensional Facial Adaptation for MPEG-4 Talking Heads

This paper studies a new method for three-dimensional (3D) facial model adaptation and its integration into a text-to-speech (TTS) system. The 3D facial adaptation requires a set of two orthogonal views of the...

Authors: Nikos Grammalidis, Nikos Sarris, Fani Deligianni and Michael G. Strintzis

Image-Based Multiresolution Implicit Object Modeling

We discuss two image-based 3D modeling methods based on a multiresolution evolution of a volumetric function′s level set. In the former method, the role of the level set implosion is to fuse ("sew" and "stitch...

Authors: Augusto Sarti and Stefano Tubaro

Parameterized Facial Expression Synthesis Based on MPEG-4

In the framework of MPEG-4, one can include applications where virtual agents, utilizing both textual and multisensory data, including facial expressions and nonverbal speech help systems become accustomed to ...

Authors: Amaryllis Raouzaiou, Nicolas Tsapatsoulis, Kostas Karpouzis and Stefanos Kollias

A Reduced-Complexity Fast Algorithm for Software Implementation of the IFFT/FFT in DMT Systems

The discrete multitone (DMT) modulation/demodulation scheme is the standard transmission technique in the application of asymmetric digital subscriber lines (ADSL) and very-high-speed digital subscriber lines (VD...

Authors: Tsun-Shan Chan, Jen-Chih Kuo and An-Yeu (Andy) Wu

High-Level Synthesis of DSP Applications Using Adaptive Negative Cycle Detection

The problem of detecting negative weight cycles in a graph is examined in the context of the dynamic graph structures that arise in the process of high level synthesis (HLS). The concept of adaptive negative cycl...

Authors: Nitin Chandrachoodan, Shuvra S. Bhattacharyya and K. J. Ray Liu

Lightweight Floating-Point Arithmetic: Case Study of Inverse Discrete Cosine Transform

To enable floating-point (FP) signal processing applications in low-power mobile devices, we propose lightweight floating-point arithmetic. It offers a wider range of precision/power/speed/area trade-offs, but...

Authors: Fang Fang, Tsuhan Chen and Rob A. Rutenbar

AVSynDEx: A Rapid Prototyping Process Dedicated to the Implementation of Digital Image Processing Applications on Multi-DSP and FPGA Architectures

We present AVSynDEx (concatenation of AVS SynDEx), a rapid prototyping process aiming to the implementation of digital signal processing...

Authors: Virginie Fresse, Olivier Déforges and Jean-François Nezan

Low-Complexity Versatile Finite Field Multiplier in Normal Basis

A low-complexity VLSI array of versatile multiplier in normal basis over is presented. The finite field parameters can be changed accord...

Authors: Hua Li and Chang Nian Zhang

Editorial

Authors: Yuke Wang and Yu Hen Hu

Design and DSP Implementation of Fixed-Point Systems

This article is an introduction to the FRIDGE design environment which supports the design and DSP implementation of fixed-point digital signal processing systems. We present the tool-supported transformation ...

Authors: Martin Coors, Holger Keding, Olaf Lüthje and Heinrich Meyr

Wavelet Kernels on a DSP: A Comparison between Lifting and Filter Banks for Image Coding

We develop wavelet engines on a digital signal processors (DSP) platform, the target application being image and intraframe video compression by means of the forthcoming JPEG2000 and Motion-JPEG2000 standards....

Authors: Stefano Gnavi, Barbara Penna, Marco Grangetto, Enrico Magli and Gabriella Olmo

A DSP Based POD Implementation for High Speed Multimedia Communications

In the cable network services, the audio/video entertainment contents should be protected from unauthorized copying, intercepting, and tampering. Point-of-deployment (POD) security module, proposed by

Authors: Chang Nian Zhang, Hua Li, Nuannuan Zhang and Jiesheng Xie

Partitioning and Scheduling DSP Applications with Maximal Memory Access Hiding

This paper presents an iteration space partitioning scheme to reduce the CPU idle time due to the long memory access latency. We take into consideration both the data accesses of intermediate and initial data....

Authors: Zhong Wang, Edwin Hsing-Mean Sha and Yuke Wang

Frequency Spectrum Based Low-Area Low-Power Parallel FIR Filter Design

Parallel (or block) FIR digital filters can be used either for high-speed or low-power (with reduced supply voltage) applications. Traditional parallel filter implementations cause linear increase in the hardw...

Authors: Jin-Gyun Chung and Keshab K. Parhi

P-CORDIC: A Precomputation Based Rotation CORDIC Algorithm

This paper presents a CORDIC (coordinate rotation digital computer) algorithm and architecture for the rotation mode in which the directions of all micro-rotations are precomputed while maintaining a constant ...

Authors: Martin Kuhlmann and Keshab K. Parhi

Editorial

Authors: Anand G. Dabak, Erik Dahlman and Giridhar D. Mandyam

On Bandwidth Efficient Modulation for High-Data-Rate Wireless LAN Systems

We address the problem of high-data-rate orthogonal frequency division multiplexed (OFDM) systems under restrictive bandwidth constraints. Based on recent theoretic results, multiple-input multiple-output (MIM...

Authors: John D. Terry, Juha Heiskala, Victor Stolpman and Majid Fozunbal

EM-Based Multiuser Detection in Fast Fading Multipath Environments

We address the problem of multiuser detection in fast fading multipath environments for DS-CDMA systems. In fast fading scenarios, temporal variations of the channel cause significant performance degradation e...

Authors: Mohammad Jaber Borran and Behnaam Aazhang

An Adaptive Channel Estimation Algorithm Using Time-Frequency Polynomial Model for OFDM with Fading Multipath Channels

Orthogonal frequency division multiplexing (OFDM) is an effective technique for the future 3G communications because of its great immunity to impulse noise and intersymbol interference. The channel estimation ...

Authors: Xiaowen Wang and K. J. Ray Liu

Joint Transmitter-Receiver Optimization in the Downlink CDMA Systems

To maximize the downlink code-division multiple access (CDMA) system capacity, we propose to minimize the total transmitted power of the system subject to users′ signal-to-interference ratio (SIR) requirements...

Authors: Mohammad Saquib and Habibul Islam

Reduced-Rank Chip-Level MMSE Equalization for the 3G CDMA Forward Link with Code-Multiplexed Pilot

This paper deals with synchronous direct-sequence code-division multiple access (CDMA) transmission using orthogonal channel codes in frequency selective multipath, motivated by the forward link in 3G CDMA sys...

Authors: Samina Chowdhury, Michael D. Zoltowski and J. Scott Goldstein

Dual Switched Predictive DIR MLSD Receiver for Dynamic Channels

A linear prefilter can be used to reduce the required complexity of a maximum likelihood sequence detector Viterbi algorithm (MLSD-VA) by shortening the overall channel and prefilter impulse response in dynami...

Authors: Michael Boyle and Anthony D. Fagan

Sequential Parameter Estimation of Time-Varying Non-Gaussian Autoregressive Processes

Parameter estimation of time-varying non-Gaussian autoregressive processes can be a highly nonlinear problem. The problem gets even more difficult if the functional form of the time variation of the process pa...

Authors: Petar M. Djurić, Jayesh H. Kotecha, Fabien Esteve and Etienne Perret

Spatial Block Codes Based on Unitary Transformations Derived from Orthonormal Polynomial Sets

Recent work in the development of diversity transformations for wireless systems has produced a theoretical framework for space-time block codes. Such codes are beneficial in that they may be easily concatenat...

Authors: Giridhar D. Mandyam

Performance of Reverse-Link Synchronous DS-CDMA System on a Frequency-Selective Multipath Fading Channel with Imperfect Power Control

We analyze the performance for reverse-link synchronous DS-CDMA system in a frequency-selective Rayleigh fading channel with an imperfect power control scheme. The performance degradation due to power control ...

Authors: Seung-Hoon Hwang and Duk Kyung Kim

Chip-Level Channel Equalization in WCDMA Downlink

The most important third generation (3G) cellular communications standard is based on wideband CDMA (WCDMA). Receivers based on TDMA style channel equalization at the chip level have been proposed for a WCDMA ...

Authors: Kari Hooli, Markku Juntti, Markku J. Heikkilä, Petri Komulainen, Matti Latva-aho and Jorma Lilleberg

Simulation of Specular Surface Imaging Based on Computer Graphics: Application on a Vision Inspection System

This work aims at detecting surface defects on reflecting industrial parts. A machine vision system, performing the detection of geometric aspect surface defects, is completely described. The revealing of defe...

Authors: Ralph Seulin, Frederic Merienne and Patrick Gorria

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

Editorial

Authors: Luciano da F. Costa and Fabrice Meriaudeau

Defect Detection on Inclined Textured Planes Using the Shape from Texture Method and the Delaunay Triangulation

We present one method for detecting defects on an inclined textured plane. This method uses a combination of a shape from texture (SFT) method with the Delaunay triangulation technique. The SFT method provides...

Authors: Justin Plantier, Laurent Boutté and Sylvie Lelandais

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

Automated Quality Assurance Applied to Mammographic Imaging

Quality control in mammography is based upon subjective interpretation of the image quality of a test phantom. In order to suppress subjectivity due to the human observer, automated computer analysis of the Le...

Authors: Lilian Blot, Anne Davis, Mike Holubinka, Robert Martí and Reyer Zwiggelaar

Detection of Noncircularity and Eccentricity of a Rolling Winder by Artificial Vision

A common objective in the web transport industry is to increase the velocity as much as possible. Some disturbances drastically limit this velocity. Time-varying eccentricity of the rolling winder is one of th...

Authors: Christophe Doignon and Dominique Knittel

A Machine Vision Quality Control System for Industrial Acrylic Fibre Production

This paper describes the implementation of INFIBRA, a machine vision system used in the quality control of acrylic fibre production. The system was developed by INETI under a contract with a leading industrial...

Authors: Paulo Heleno, Roger Davies, Bento A. Brázio Correia and João Dinis

Content-Based Image Retrieval for Semiconductor Process Characterization

Image data management in the semiconductor manufacturing environment is becoming more problematic as the size of silicon wafers continues to increase, while the dimension of critical features continues to shri...

Authors: Kenneth W. Tobin, Thomas P. Karnowski, Lloyd F. Arrowood, Regina K. Ferrell, James S. Goddard and Fred Lakhani

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