Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!pacbell.com!pacbell!well!moon!ymt!ymt!mike From: mike@ymt.com (Michael Czeiszperger) Newsgroups: sci.electronics Subject: Re: X-Y detection of moving metal ball? Message-ID: Date: 23 Apr 91 03:22:50 GMT References: <14815@mcdphx.phx.mcd.mot.com> <2404@tuvie.UUCP> Lines: 21 hp@vmars.tuwien.ac.at (Peter Holzer) writes: >I am working on a similar project, and the setup we have now (12MHz AT >with frame grabber card) is much too slow to do serious pattern >recognition in real-time. I can't do much more than find the nearest >dark spot to the last ball position and check if it doesn't exceed a >certain size. If there are lines or holes on the plane it will >eventually find these instead of the ball. I am now looking for signal >processors to get the necessary performance. There's an interesting book out called A Robot Ping Pong Player which describes a real time vision system that can detect a ping pong ball and hit it back. It is suprisingly capable, able to accurately judge not only trajectory, but spin as well. They used a four camera (Hitachi KP-231A) depth perception system coupled with a custom VLSI moment generator chip to track the ball. The book is by Russell L. Anderson of the Robotics Systems Research Department of AT&T Bell Labs, and available from the MIT press ISBN 0-262-01101-8. -- Michael Czeiszperger | "I'm trying to teach a caveman to play scrabble mike@ymt.com | but the only word he is knows is 'uugh', and he Greenbrae, CA | doesn't know how to spell it!"