Related Experiment Video
Updated: Jul 7, 2026
06:15
Rapid Setup of Tissue Microarray and Tiled Area Imaging on the Multiplexed Ion Beam Imaging Microscope Using the Tile/SED/Array Interface
Published on: September 15, 2023
A JBIG-based approach to the encoding of contour maps
Summary
A new method simplifies lossless contour map encoding using transition points and the Joint Bilevel Image Experts Group (JBIG) standard. This approach outperforms differential chain-coding and requires minimal implementation effort.
Area of Science:
- Computer Science
- Information Theory
- Digital Image Processing
Background:
- Contour map encoding is crucial for digital representation of spatial data.
- Existing methods like differential chain-coding have limitations in efficiency and complexity.
- The concept of 'transition points' offers a novel approach to map representation.
Discussion:
- This paper introduces a simplified representation of transition points for contour maps.
- The proposed method transforms contour map encoding into a lossless image coding problem.
- The Joint Bilevel Image Experts Group (JBIG) standard is investigated for encoding these transition point maps.
Key Insights:
- Encoding contour maps using transition point maps and the JBIG standard achieves high efficiency.
- The JBIG-based method demonstrates superior performance compared to differential chain-coding in most experimental scenarios.
- The availability of off-the-shelf JBIG codecs significantly reduces implementation complexity.
Outlook:
- This technique offers a practical and efficient solution for lossless contour map compression.
- Further research could explore adaptations of this method for other types of spatial data representations.
- The integration of JBIG into contour map processing workflows presents new avenues for digital cartography and GIS.
Related Concept Videos
01:22Level Curves and Contour Maps
Level curves and contour maps provide a way to visualize functions of two variables on a two-dimensional plane. A useful example is a topographic map, where curved lines represent locations that share the same elevation. In mathematics, these curves are called level curves or contour lines. Each contour line corresponds to points in the domain where the function has a constant value. For a function of two variables written as z = f(x,y), a level curve is defined by the equation f(x,y) = k,...
01:29Topographic Surveying and Contours
Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...
01:25Methods of Obtaining Topography
Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
01:29Plotting of Topographic Maps
Topographic maps represent the Earth's surface features using contour lines, which connect points of equal elevation to create a two-dimensional representation of three-dimensional terrain. Creating a topographic map requires a systematic approach.Begin by plotting a scaled grid and marking intersections corresponding to the survey's elevation data points. Assign elevation values at these intersections to build the base map. Next, determine contour levels using a consistent contour interval,...
01:20Elevation of Intermediate Points on Vertical Curves
Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...
01:24Area Computation by the Alternative Coordinate Method
The alternative coordinate method, also known as the Shoelace Formula, is a technique for determining the area of a traverse using Cartesian coordinates. This method relies on the sequential arrangement of x and y coordinates for each point of the shape, ensuring accuracy and ease of application.In this approach, each corner's x and y coordinates are listed as fractions, with the x-coordinate as the numerator and the y-coordinate as the denominator. These coordinates are arranged sequentially...