Accession Number : ADA116769

Title :   Detecting Line-Road and Road-Intersection Patterns at Various Angles.

Descriptive Note : Research note,

Corporate Author : ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA

Personal Author(s) : Singleton,J Robert ; Chen,Pi-Fuay

PDF Url : ADA116769

Report Date : Oct 1981

Pagination or Media Count : 46

Abstract : An extended Walsh transform technique for detecting and recognizing a set of cartographic features, such as linear roads and road intersections, at a variety of angles with the axes of the inspecting window is described. The method was implemented as software for an existing sensor array minicomputer system, which consists of a solid state array to convert optical images into electronic signals, a minicomputer as signal processor, and a computer-controlled translational stage as the imagery holder. Each angular orientation of the cartographic features is defined as a class of pattern and classified by using two minimum distance classifiers together with some pretesting algorithms. Typical experimental results are presented and conclusions are given.

Descriptors :   *Mapping, *Optical images, *Roads, *Patterns, *Signal processing, Orientation(Direction), Angles, Computer programs, Minicomputers, Walsh functions, Detectors, Arrays, Algorithms, Signals, Electronics

Subject Categories : Cartography and Aerial Photography
      Computer Programming and Software
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE