In GIS system, we often use vector contour map to show or locate position on the earth. Since such map data is very worthy of value, it is necessary and important to protect its copyright. In this paper, we propose a new method to embed watermark into the angle parameter of polygonal lines or curves in a contour map after its parameterization. The watermark can be detected as proof of the owner...

This paper proposes a probabilistic prior-based active contour model for segmenting human brain MR images. Our model is formulated with the maximum a posterior (MAP) principle and implemented under the level set framework. Probabilistic atlas for the structure of interest, e.g., cortical gray matter or caudate nucleus, can be seamlessly integrate into the level set evolution procedure to provid...

Some applications such as the autonomous navigation in natural terrain and the automation of map making process require high-level scene descriptions as well as geometrical representation of the natural terrain environments. In this paper, we present methods for building high level terrain descriptions, referred as topographic maps, by extracting terrain features like "peaks", "pits", "ridges",...

A new algorithm for reconstructing contour map from raster DEM data is presented. It runs completely within the programmable 3D visualization pipeline in real-time. During the rendering, we first make an elevation gradient map out of original terrain vertex data. Then figure out the final contour lines with image-space processing, and blend the values on the original scene to obtain the final s...

A variety of operations have been described in recent years that are intended as digital solutions to a basic class of cartographic adjacency problems. A selection of these algorithms includes: interpolation; Voronoi diagrams of point distributions (proximal maps, Thiessen polygons); skeleton encoding (of scanned characters or polygons); corridor selection, or extraction of regions within speci...

Terrain relief is an important feature of geographic environment and a major element of topographic maps. Contour lines are widely adopted as representation of terrain relief in traditional maps. In general, contour maps are still indispensable due to the following reasons: 1) Abundant terrain data are still represented by contour maps; 2) Contour maps contain fewer limits for use in different ...

Earlier studies have suggested that proficient map readers employ cognitive strategies such as information chunking and schemas to aid information processing. In this paper experienced and non-experienced map readers studied and reproduced firstly a town map and then a topographical map. No group differences were observed for the town map task. When the topographical map was recalled the expert...

This paper describes the development and evaluation of an educational Augmented Reality application for mobile phones that supports landscape architecture students who learn how to read and analyse contour maps. The results show that Augmented Reality can enhance appeal and clearness of a paper contour map but if too much information is presented, it could also confuse the map information.