Contour maps provide a general method for recognizing twodimensional shapes. All but blank images give rise to such maps, and people are good at recognizing objects and shapes from them. The maps are encoded easily in long feature vectors that are suitable for recognition by an associative memory. These properties of contour maps suggest a role for them in early visual perception. The prevalenc...

HAL is a multi-disciplinary 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 from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau...

during an 11 days mission in february 2000 the shuttle radar topography mission (srtm) collected data over 80% of the earth's land surface, for all areas between 60 degrees n and 56 degrees s latitude. since srtm data became available, many studies utilized them for application in topography and morphometric landscape analysis. exploiting srtm data for recognition and extraction of topographic ...

Self Organizing Maps (SOMs) have attracted the attention of many computer vision scientists, particularly when dealing with image segmentation as a contour extraction problem. The idea of utilizing the prototypes (weights) of a SOM to model an evolving contour has produced a new class of Active Contour Models (ACM s), known as SOM based ACM s. Such models have been proposed in general with the ...

Contour Trees and Reeb Graphs are firmly embedded in scientific visualization for analysing univariate (scalar) fields. We generalize this analysis to multivariate fields with a data structure called the Joint Contour Net that quantizes the variation of multiple variables simultaneously. We report the first algorithm for constructing the Joint Contour Net. We also demonstrate that Contour Trees...

This pqm pments a rasterbased algorithm for reconstruction of 3-D terrain data from contour information appearing on the conventional 2-D map The height of an interior point between two neighboring contam is defined by a linear interpolation formula wt.lose variables are the height of those contours arid distance from the point to the contours. The distance from an interior mint to the contour ...

In this paper we experimentally study the context tree coding of contours in two alternative chain-code representations. The contours of the image regions are intersecting, resulting in many contour segments, each contour segment being represented by its starting position and a subsequence of chain-code symbols. A single stream of symbols is obtained, under a given ordering of the segments, by ...

The issue of graphic map load is currently very often overlooked. Conversely, having an objective knowledge the level a helps cartographers to assume map’s readability and suitability for target group users. aim this study is, therefore, use Graphic Map Load Measuring Tool (GMLMT) Subband Entropy script as metrics evaluate influence terrain type (plains, hills, highlands, mountains, high mounta...

A subtask of voice conversion is to accurately map the pitch contour of a source speaker to a target speaker. So far, the most widely employed method for carrying out this mapping is based on adjusting the pitch range of the source speaker to match the target while keeping the shape of the contour unchanged. In this project, we investigate four alternative algorithms for pitch contour mapping a...

Radar (SAR) images often exhibit profound appearance variations due to a variety of factors including clutter noise produced by the coherent nature of the illumination. Ultrasound images and infrared images have similar cluttered appearance, that make 1 dimensional structures, as edges and object boundaries difficult to locate. Structure information is usually extracted in two steps: firstly, b...