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Outputs (179)

A Phase Field Model Incorporating Generic and Specific Prior Knowledge Applied to Road Network Extraction from VHR Satellite Images (2007)
Presentation / Conference Contribution
Peng, T., Jermyn, I., Prinet, V., Zerubia, J., & Hu, B. (2007, September). A Phase Field Model Incorporating Generic and Specific Prior Knowledge Applied to Road Network Extraction from VHR Satellite Images. Presented at British Machine Conference 2007, Warwick

We address the problem of updating road maps in dense urban areas by extracting the main road network from a very high resolution (VHR) satellite image. Our model of the region occupied by the road network in the image is innovative. It incorporates... Read More about A Phase Field Model Incorporating Generic and Specific Prior Knowledge Applied to Road Network Extraction from VHR Satellite Images.

A `Gas of Circles' Phase Field Model and its Application to Tree Crown Extraction (2007)
Presentation / Conference Contribution
Horváth, P., & Jermyn, I. (2007, September). A `Gas of Circles' Phase Field Model and its Application to Tree Crown Extraction. Presented at 15th European Signal Processing Conference (EUSIPCO 2007), Poznan

The problem of extracting the region in the image domain corresponding to an a priori unknown number of circular objects occurs in several domains. We propose a new model of a ‘gas of circles’, the ensemble of regions in the image domain composed of... Read More about A `Gas of Circles' Phase Field Model and its Application to Tree Crown Extraction.

A New Phase Field Model of a `Gas of Circles' for Tree Crown Extraction from Aerial Images (2007)
Presentation / Conference Contribution
Horváth, P., & Jermyn, I. (2007, August). A New Phase Field Model of a `Gas of Circles' for Tree Crown Extraction from Aerial Images. Presented at 12th International Conference(CAIP 2007), Vienna

We describe a model for tree crown extraction from aerial images, a problem of great practical importance for the forestry industry. The novelty lies in the prior model of the region occupied by tree crowns in the image, which is a phase field versio... Read More about A New Phase Field Model of a `Gas of Circles' for Tree Crown Extraction from Aerial Images.

Removing Shape-Preserving Transformations in Square-Root Elastic (SRE) Framework for Shape Analysis of Curves (2007)
Presentation / Conference Contribution
Joshi, S., Klassen, E., Srivastava, A., & Jermyn, I. (2007, August). Removing Shape-Preserving Transformations in Square-Root Elastic (SRE) Framework for Shape Analysis of Curves. Presented at 6th International Conference on Energy Minimization Methods in Computer Vision and Pattern Recognition, Ezhou

This paper illustrates and extends an efficient framework, called the square-root-elastic (SRE) framework, for studying shapes of closed curves, that was first introduced in [2]. This framework combines the strengths of two important ideas - elastic... Read More about Removing Shape-Preserving Transformations in Square-Root Elastic (SRE) Framework for Shape Analysis of Curves.

A Novel Representation for Riemannian Analysis of Elastic Curves in R^{n} (2007)
Presentation / Conference Contribution
Joshi, S., Klassen, E., Srivastava, A., & Jermyn, I. (2007, June). A Novel Representation for Riemannian Analysis of Elastic Curves in R^{n}. Presented at 2007 IEEE Conference on Computer Vision and Pattern Recognition, Minneapolis

We propose a novel representation of continuous, closed curves in Rn that is quite efficient for analyzing their shapes. We combine the strengths of two important ideas-elastic shape metric and path-straightening methods - in shape analysis and prese... Read More about A Novel Representation for Riemannian Analysis of Elastic Curves in R^{n}.

Indexing satellite images with features computed from man-made structures on the Earth’s surface (2007)
Presentation / Conference Contribution
Bhattacharya, A., Roux, M., Maitre, H., Jermyn, I., Descombes, X., & Zerubia, J. (2007, June). Indexing satellite images with features computed from man-made structures on the Earth’s surface. Presented at 2007 International Workshop on Content-Based Multimedia Indexing, Bordeaux

Indexing and retrieval from remote sensing image databases relies on the extraction of appropriate information from the data about the entity of interest (e.g. land cover type) and on the robustness of this extraction to nuisance variables. Other ent... Read More about Indexing satellite images with features computed from man-made structures on the Earth’s surface.

Riemannian Analysis of Probability Density Functions with Applications in Vision (2007)
Presentation / Conference Contribution
Joshi, S., Srivastava, A., & Jermyn, I. (2007, June). Riemannian Analysis of Probability Density Functions with Applications in Vision. Presented at IEEE Conference on Computer Vision and Pattern Recognition 2007, Minneapolis

Applications in computer vision involve statistically analyzing an important class of constrained, nonnegative functions, including probability density functions (in texture analysis), dynamic time-warping functions (in activity analysis), and re-par... Read More about Riemannian Analysis of Probability Density Functions with Applications in Vision.

Urban Road Extraction from VHR Images Using a Multiscale Image Model and a Phase Field Model of Network Geometry (2007)
Presentation / Conference Contribution
Peng, T., Jermyn, I., Prinet, V., & Zerubia, J. (2007, April). Urban Road Extraction from VHR Images Using a Multiscale Image Model and a Phase Field Model of Network Geometry. Presented at 2007 Urban Remote Sensing Joint Event, Paris

This paper addresses the problem of automatically extracting the main road network in a dense urban area from a very high resolution optical satellite image using a variational approach. The model energy has two parts: a phase field higher-order acti... Read More about Urban Road Extraction from VHR Images Using a Multiscale Image Model and a Phase Field Model of Network Geometry.

An improved `gas of circles' higher-order active contour model and its application to tree crown extraction (2006)
Presentation / Conference Contribution
Horvath, P., Jermyn, I., Kato, Z., & Zerubia, J. (2006, December). An improved `gas of circles' higher-order active contour model and its application to tree crown extraction. Presented at 5th Indian Conference Computer Vision, Graphics and Image Processing (ICVGIP 2006), Madurai

A central task in image processing is to find the region in the image corresponding to an entity. In a number of problems, the region takes the form of a collection of circles, e.g. tree crowns in remote sensing imagery; cells in biological and medic... Read More about An improved `gas of circles' higher-order active contour model and its application to tree crown extraction.

Computing statistics from a graph representation of road networks in satellite images for indexing and retrieval (2006)
Presentation / Conference Contribution
Bhattacharya, A., Jermyn, I., Descombes, X., & Zerubia, J. (2006, October). Computing statistics from a graph representation of road networks in satellite images for indexing and retrieval. Presented at International Symposium on Computational Modelling of Objects Represented in Images (CompIMAGE 2006), Coimbra

Retrieval from remote sensing image archives relies on the extraction of pertinent information from the data about the entity of interest (e.g. land cover type), and on the robustness of this extraction to nuisance variables (e.g. illumination). Most... Read More about Computing statistics from a graph representation of road networks in satellite images for indexing and retrieval.

Nonlinear models for the statistics of adaptive wavelet packet coefficients of texture (2006)
Presentation / Conference Contribution
Aubray, J., Jermyn, I., & Zerubia, J. (2006, September). Nonlinear models for the statistics of adaptive wavelet packet coefficients of texture. Presented at Signal Processing Conference, 2006 14th European, Florence

Probabilistic adaptive wavelet packet models of texture provide new insight into texture structure and statistics by focusing the analysis on significant structure in frequency space. In very adapted subbands, they have revealed new bimodal statistic... Read More about Nonlinear models for the statistics of adaptive wavelet packet coefficients of texture.

A higher-order active contour model for tree detection (2006)
Presentation / Conference Contribution
Horvath, P., Jermyn, I., Kato, Z., & Zerubia, J. (2006, August). A higher-order active contour model for tree detection. Presented at 18th International Conference on Pattern Recognition (ICPR'06), Hong Kong

We present a model of a `gas of circles', the ensemble of regions in the image domain consisting of an unknown number of circles with approximately fixed radius and short range repulsive interactions, and apply it to the extraction of tree crowns fro... Read More about A higher-order active contour model for tree detection.

'Cite them right': Developing students' citation skills (2006)
Presentation / Conference Contribution
Pears, R. (2006, January). 'Cite them right': Developing students' citation skills. Presented at BOBCATSSS Symposium: Information, Innovation, Responsibility: Information professional in the Network Society., Tallinn University, Estonia

Phase field models and higher-order active contours (2005)
Presentation / Conference Contribution
Rochery, M., Jermyn, I., & Zerubia, J. (2005, October). Phase field models and higher-order active contours. Presented at IEEE International Conference on Computer Vision (ICCV), Beijing, China

The representation and modelling of regions is an important topic in computer vision. In this paper, we represent a region via a level set of a 'phase field' function. The function is not constrained, e.g. to be a distance function; nevertheless, pha... Read More about Phase field models and higher-order active contours.

Texture-adaptive mother wavelet selection for texture analysis (2005)
Presentation / Conference Contribution
Abhayaratne, G., Jermyn, I., & Zerubia, J. (2005, September). Texture-adaptive mother wavelet selection for texture analysis. Presented at IEEE International Conference on Image Processing (ICIP), Genova, Italy

Classification results obtained using wavelet-based texture analysis techniques vary with the choice of mother wavelet used in the methodology. We discuss the use of mother wavelet filters as parameters in a probabilistic approach to texture analysis... Read More about Texture-adaptive mother wavelet selection for texture analysis.

New higher-order active contour energies for network extraction (2005)
Presentation / Conference Contribution
Rochery, M., Jermyn, I., & Zerubia, J. (2005, September). New higher-order active contour energies for network extraction. Presented at IEEE International Conference on Image Processing (ICIP), Genoa, Italy

Using the framework of higher-order active contours, we present a new quadratic continuation energy for the extraction of line networks (e.g. road, hydrographic, vascular) in the presence of occlusions. Occlusions create gaps in the data that frequen... Read More about New higher-order active contour energies for network extraction.

Multimodal statistics of adaptive wavelet packet coefficients: experimental evidence and theory (2005)
Presentation / Conference Contribution
Cossu, R., Jermyn, I., & Zerubia, J. (2023, January). Multimodal statistics of adaptive wavelet packet coefficients: experimental evidence and theory. Presented at 4th International Conference on Physics in Signal and Image Processing, Toulouse, France

In recent work, it was noted that although the subband histograms for standard wavelet coefcients take on a generalized Gaussian form, this is no longer true for wavelet packet bases adapted to a given texture. Instead, three types of subband statist... Read More about Multimodal statistics of adaptive wavelet packet coefficients: experimental evidence and theory.

Gap Closure in (Road) Networks Using Higher-Order Active Contours (2004)
Presentation / Conference Contribution
Rochery, M., Jermyn, I., & Zerubia, J. (2004, October). Gap Closure in (Road) Networks Using Higher-Order Active Contours. Presented at IEEE International Conference on Image Processing (ICIP), Singapore

We present a new model for the extraction of networks from images in the presence of occlusions. Such occlusions cause gaps in the extracted network that need to he closed. Using higher-order active contours, which allow the incorporation of sophisti... Read More about Gap Closure in (Road) Networks Using Higher-Order Active Contours.