This is a demo of using AprilTags to detect the position of a rectangular display. It uses WebAssembly to expose the official AprilTag library to the web.
Print out one of these legends (ANSI Letter, 8.5x11in, PDF or 300ppi, PNG) to setup your monitor. The tags should be 1.75 inches/44.5 mm, including their white borders.
Don't want to print them out? You can still try it by pointing your webcam at the legend (or accessing it from a different device, if you have an integrated camera).
This project uses modified components from https://github.com/AprilRobotics/apriltag. See notice below.
Copyright (C) 2013-2016, The Regents of The University of Michigan. All rights reserved. This software was developed in the APRIL Robotics Lab under the direction of Edwin Olson, ebolson@umich.edu. This software may be available under alternative licensing terms; contact the address above. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. The views and conclusions contained in the software and documentation are those of the authors and should not be interpreted as representing official policies, either expressed or implied, of the Regents of The University of Michigan.