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
Distribution Statement : APPROVED FOR PUBLIC RELEASE