This work presents a continuous level of detail representation of foliage of trees. Multiresolution modeling allows to adapt the number of polygons to render to the relevance of the object in the scene. However, foliage is represented by... more
We are currently developing a component based, parallel visualization and graphical analysis tool for visualizing and analyzing data on twoand three-dimensional (20, 3 0 ) meshes. The tool consists of three primary components: a graphical... more
To determine the impact of seeps and focused flow on the occurrence of shallow gas hydrates, several seafloor mounds in the Atwater Valley lease area of the Gulf of Mexico were surveyed with a wide range of seismic frequencies. Seismic... more
Image de-noising and enhancement form fundamental problems in many engineering and biomedical applications. The paper is devoted to the study of the multi-resolution approach to this problem employing the Haar wavelet transform. The... more
The National Airborne Field Experiment 2006 (NAFE06) was conducted during a three week period of November 2006 in the Murrumbidgee River catchment, located in southeastern Australia. One objective of NAFE06 was to explore the suitability... more
With the increasing use of the Internet several problems have arisen regarding the processing of electronic documents. These include content filtering, content retrieval/search. Moreover, document security has taken a centre stage... more
Motivation: Efficient fitting tools are needed to take advantage of a fast growth of atomic models of protein domains from crystallography or comparative modeling, and low-resolution density maps of larger molecular assemblies. Here, we... more
Motivation: Efficient fitting tools are needed to take advantage of a fast growth of atomic models of protein domains from crystallography or comparative modeling, and low-resolution density maps of larger molecular assemblies. Here, we... more
Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2011Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2011Günümüzde bilgisayar grafik teknolojileri giderek... more
Several algorithms are reviewed for computing various types of wavelet transforms: the Mallat algorithm, the "a trous" algorithm and their generalizations by Shensa. The goal is 1) to develop guidelines for implementing discrete and... more
![Fig. 4. Rearrangement of the DWT cell of Fig. 1(a) that avoids subsam- pling and, hence, allows the application of fast filtering techniques. fore some time processing must be done in order to avoid wrap-around effects. There are two well-known methods for this, called the overlap-add and overlap-save methods [24]. One is the transposed form of the other and both require exactly the same complexity. For one filter of length L /2, with input block length B/2, wrap-around effects are avoided if the FFT-length AN satisfies the inequality](https://figures.academia-assets.com/118857237/figure_003.jpg)
![Fig. 6. Simple example of fast running FIR filtering algorithm with decimation ratio R = 2 [23]. Subscripts 0 and 1 indicate biphase decomposi- tion.](https://figures.academia-assets.com/118857237/figure_005.jpg)
In this paper, we address the problem of detecting and localizing cars in still images. The proposed car detection system is based on a hierarchical feature detector in which the processing units are shunting inhibitory neurons. To reduce... more
User interaction with animated hair is desirable for various applications but difficult because it requires real-time animation and rendering of hair. Hair modeling, including styling, simulation, and rendering, is computationally... more
A variety of new and powerful algorithms have been developed for image compression over the years. Among them the wavelet-based image compression schemes have gained much popularity due to their overlapping nature which reduces the... more
We propose a technique for simplification and multiresolution modeling of a terrain represented as a TIN. Our goal is to maintain the morphological structure of the terrain in the resulting multiresolution model. To this aim, we extend... more
We present a novel multi‐resolution algorithm for simulation of complex cloth‐like deforming meshes. Our algorithm precomputes a multi‐resolution hierarchy by using a combination of ‘chromatic decomposition’1 and polygonal simplification... more
The research project "Integrated System for Transport Infrastructure surveillance and Monitoring by Electromagnetic Sensing" (ISTIMES), was approved in the 7th Framework Programme, in the Joint Call ICT and Security and started... more
In this paper, a new technique for hiding text in a bitmap images will be present. The technique based on using an index of the dictionary representing the characters of the secret messages instead of the characters themselves. The... more
Computer Vision can provide a great deal of assistance to Intelligent Vehicles. In this paper an Advanced Driver Assistance Systems for Vehicle Detection is presented. A geometric model of the vehicle is defined where its energy function... more
Eighteen months into the project, the long-term goals and objectives remain as stated in the progress report last year. Our goal is to develop an ensemble ocean forecast methodology, using Bayesian Hierarchical Modelling (BHM) tools. The... more
Large scale scientific simulations routinely produce data of increasing resolution. Analyzing this data is key to scientific discovery. A critical bottleneck facing the analysis is the I/O time to access the data. One method of addressing... more
We present a simple method to render fields of grass, animated in the wind, in real time. The technique employs vertex shaders to render displacement maps with Russian doll style transparent shells. Animation is achieved by translating... more
This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will... more
The use of a multi-resolution control model for a robot painting system is reported in this paper. It gives a flexible and general framework for the control system design which eases software development and integration, as well as... more
Multi-resolution codes enable multicast at different rates to different receivers, a setup that is often desirable for graphics or video streaming. We propose a simple, distributed, two-stage message passing algorithm to generate network... more
The objectives and methodology of the MAMUD research project are presented in this paper. MAMUD is an acronym for Measuring and Modeling Urban Dynamics: Impact on Quality of Live and Hydrology. The research will be conducted over a four... more
Motivation: Efficient fitting tools are needed to take advantage of a fast growth of atomic models of protein domains from crystallography or comparative modeling, and low-resolution density maps of larger molecular assemblies. Here, we... more
In this paper, a path planning algorithm is developed based on a Minimal Representation Size Cluster Genetic Algorithm (MRSC-GA) [ 5 ] . The algorithm utilizes evolutionary computation techniques for planning paths for mobile robots,... more
There is a recognized need for automated path planning for unmanned air vehicles (UAVs) and guided munitions. Evolutionary programming approaches provide an alternative to classical functional optimization methods with the capability of... more
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or... more
While progressive compression techniques were proposed long time ago, fast and efficient streaming of detailed 3D models over lossy networks still remains a challenge. A primary reason is that packet loss occurring in unreliable networks... more
The goal of this paper is to describe a new fully-reversible image transform specifically designed for an efficient (pseudo-critical) coding while preserving a psychovisual Fourier domain description. There is now strong evidence for the... more
Curvelet transform is a promising tool for multi-resolution analysis on images. This paper explains a new approach for facial expression recognition based on curvelet features extracted using curvelet transform. Curvelet transform is... more
Driven by increasing demands on connectivity to improve safety, situational awareness and operational effectiveness for first responders, more and more public safety agencies are realizing the need of modernization of their existing... more
Several researchers have used image enhancement methods to reduce detection errors and increase verification accuracy in palmprint identification. Divergent opinions exist among experts regarding the best method of image filtering to... more
Since increasing demand for high bit-depth video places large demands upon resources, such as communication bandwidth as well as memory and storage capacity, research into improving the compression ratio (CR) for these videos is... more
In this paper, we propose a new approach for symbol recognition using structural signatures and a Galois Lattice as classifier. The structural signatures are based on topological graphs computed from segments which are extracted from the... more
Je tiens tout d'abord à remercier chaleureusement Karl Tombre et Josianne Zérubia d'avoir rapporté la thèse. Je les remercie pour leurs remarques pertinentes et je leur en suis reconnaissant. Je remercie Eric Lecolinet d'avoir accepté de... more
In Riemannian geometry, a distance function is determined by an inner product on the tangent space. In Riemann-Finsler geometry, this distance function can be determined by a norm. This gives more freedom on the form of the so-called... more
Traditional design and implementation of large atmospheric models is a difficult, tedious and erroneous task. With the Ctadel project we propose a new method of code generation, where the designer describes the model in an abstract... more
In this article, we propose a novel approach for discerning which scanner has been used to scan a particular document. Its originality relates to a signature extracted in the wavelet domain of the digitized documents where the acquisition... more
To minimize the dose applied to the specimens during imaging in a MeV ion microbeam we have investigated new concepts that allow collection of images with multi-resolution support. To test the concept, a set of reference PIXE microbeam... more
To minimize the dose applied to the specimens during imaging in a MeV ion microbeam we have investigated new concepts that allow collection of images with multi-resolution support. To test the concept, a set of reference PIXE microbeam... more
A temperature profile 2400 m along the offshore active caldera of Campi Flegrei (Gulf of Pozzuoli) was obtained by the installation of a permanent fiber-optic monitoring system within the framework of the Innovative Monitoring for Coastal... more
The use of a multi-resolution control model for a robot painting system is reported in this paper. It gives a flexible and general framework for the control system design which eases software development and integration, as well as... more
In this paper, we describe a hybrid learning system which combines a genetic algorithm with a neural network to classify grayscale images. The system operates on multi-resolution images which a~ formed by applying Gabor filters to a set... more
People typically learn through exposure to visual concepts associated with linguistic descriptions. For instance, teaching visual object categories to children is often accompanied by descriptions in text or speech. In a machine learning... more