Accession Number : ADA285492


Title :   Estimating the Heading Direction Using Normal Flow


Corporate Author : MARYLAND UNIV COLLEGE PARK COMPUTER VISION LAB


Personal Author(s) : Aloimonos, Yiannis ; Duric, Zoran


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a285492.pdf


Report Date : Jan 1994


Pagination or Media Count : 25


Abstract : If an observer is moving rigidly with bounded rotation then normal flow measurements (i.e., the spatiotemporal derivatives of the image intensity function) give rise to a constraint on the observer's translation. This novel constraint gives rise to a robust, qualitative solution to the problem of recovering the observer's heading direction, by providing an area where the Focus of Expansion lies. If the rotation of the observer is large then the solution area is large too, while small rotation causes the solution area to be small, thus giving rise to a robust solution. In the paper the relationship between the solution area and the rotation and translation vectors is studied and experimental results using synthetic and real calibrated image sequences are presented. This work demonstrates that the algorithm developed for the case of pure translation, if appropriately modified, results in a robust algorithm that works in the case of general rigid motion with bounded rotation. Subsequently, it has the potential to replace expensive accelerometers, inertial systems and inaccurate odometers in practical navigational systems for the problem of kinetic stabilization, which is a prerequisite for any other navigational ability.


Descriptors :   *NAVIGATION , STABILIZATION , ALGORITHMS , IMAGE PROCESSING , OBSERVERS , REPRINTS , MEASUREMENT , ACCELEROMETERS , BEARING(DIRECTION) , ROTATION , FOCAL PLANES , INERTIAL SYSTEMS , KINETICS , COMPUTER VISION , FLOW , EXPANSION , TRANSLATIONS , OPTICAL ANALYSIS , ODOMETERS , IMAGE MOTION COMPENSATION , MOTION , ORIENTATION(DIRECTION) , SEQUENCES , PROBLEM SOLVING , THREE DIMENSIONAL , FLOW FIELDS , SOLUTIONS(GENERAL)


Subject Categories : Cybernetics
      Navigation and Guidance
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE