Science and Golf II: Proceedings of the 1994 World Scientific Congress of Golf

By A. J. Cochran; M. R. Farrally | Go to book overview

50

Video monitoring system to measure initial launch characteristics of golf ball

W. Gobush, D. Pelletier and C. Days

Titleist and Foot-Joy Worldwide, Fairhaven, Massachusetts, USA

Abstract

A video data acquisition system is described which takes two snapshot views of selected markers on a golf ball in the immediate post-launch time period. The analysis of the combined snapshot images allows the initial ball speed, launch angle and spin rate to be measured in real time. The mathematical and photogrammetrical techniques are described that solve this motion analysis problem.

Keywords: Video, Pixels, Retroreflector, Strobe, Translational Velocity, Angular Velocity, Photogrammetry.


1 Introduction

The measurement of ball velocity, spin rate and launch angle is critically important in assessing new ball and club designs. Once the ball has left the tee, the flight motion is essentially prescribed by the velocity and spin rate created by the impact and the aerodynamic characteristics of the golf ball. In automating these kinematic measurements for outdoor use, computerized video technology has been utilized and resulted in a compact, automatic and portable measuring system.


2 Background

The study of high speed motion analysis has frequently used the medium of 16mm film or Polaroid film. The film is usually projected onto a digitizing tablet and points of interest can be selected frame by frame. However, high-speed film results in excessive film developing time and the inability to rapidly digitize frames make film a less than perfect medium for the study of golf ball motion. Recently, the advances in computerized video technology permits video to compete with film as a convenient, accurate and cost-effective research tool.

A solution to the motion blur problem caused by the fast ball speeds is the addition of the strobe lamp to the video camera. Although the typical electronic shutter is not fast enough for stilling the image of a golf ball, it results in a high level of contrast by only allowing outdoor light to photosensitize the video sensor for the duration of the scene to be measured (see Figure 1). The real motion freezing of markers on a golf

Science and Golf II: Proceedings of the World Scientific Congress of Golf. Edited by A.J. Cochran and M.R. Farrally. Published in 1994 by E & FN Spon, London. ISBN 0 419 18790 1

-327-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
One moment ...
Default project is now your active project.
Project items
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Buy instant access to cite pages or passages in MLA 8, MLA 7, APA and Chicago citation styles.

(Einhorn, 1992, p. 25)

(Einhorn 25)

(Einhorn 25)

1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

Note: primary sources have slightly different requirements for citation. Please see these guidelines for more information.

Cited page

Bookmark this page
Science and Golf II: Proceedings of the 1994 World Scientific Congress of Golf
Table of contents

Table of contents

Settings

Settings

Typeface
Text size Smaller Larger Reset View mode
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

Help
Full screen
Items saved from this book
  • Bookmarks
  • Highlights & Notes
  • Citations
/ 643

matching results for page

    Questia reader help

    How to highlight and cite specific passages

    1. Click or tap the first word you want to select.
    2. Click or tap the last word you want to select, and you’ll see everything in between get selected.
    3. You’ll then get a menu of options like creating a highlight or a citation from that passage of text.

    OK, got it!

    Cited passage

    Style
    Citations are available only to our active members.
    Buy instant access to cite pages or passages in MLA 8, MLA 7, APA and Chicago citation styles.

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn, 1992, p. 25).

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences." (Einhorn 25)

    "Portraying himself as an honest, ordinary person helped Lincoln identify with his audiences."1

    1. Lois J. Einhorn, Abraham Lincoln, the Orator: Penetrating the Lincoln Legend (Westport, CT: Greenwood Press, 1992), 25, http://www.questia.com/read/27419298.

    Cited passage

    Thanks for trying Questia!

    Please continue trying out our research tools, but please note, full functionality is available only to our active members.

    Your work will be lost once you leave this Web page.

    Buy instant access to save your work.

    Already a member? Log in now.

    Search by... Author
    Show... All Results Primary Sources Peer-reviewed

    Oops!

    An unknown error has occurred. Please click the button below to reload the page. If the problem persists, please try again in a little while.