Overview

  • There are Four new targets boards that can be arbitrarily placed on set to match per shot tracking needs
  • Each board is 1 meter wide by 1 meter long or 1.5m x 1.5m and can be printed on durable vinyl
  • The targets on each board are unique so any combination of these four boards can be used together
  • The purpose of these new boards is to reduce the work and time involved in surveying targets for a shoot
  • The targets are designed to be surveyed at only 3 points on each board. This means that creating an arbitrarily placed fiducial configuration of 84 points, requires surveying only 13 points: 3 per board and 1 for backsite Surveying now takes roughly 10 minutes to create a constellation with 84 unique fiducials
  • The targets can be placed and oriented in any manner as long as the Intersense camera can still see them on set
  • Targets can be placed easily on the floor or walls or random incline
  • Targets can be left uncut on a long strip and pre-surveyed for a totalstation free setup

 

 

About the Boards

Each Board is Unique

This means that you can’t arbitrarily swap out one board for another. Because each board is unique this allows any combination of boards to be used to create a constellation file. Additionally, each board contains unique fiducial IDs and has a unique title. Each board is identified by a unique letter and contains the following fiducials and survey points:

 

How to Use

The boards can be placed, once mounted to a Rigid Substrate, at any angle and any location (so long as the intersense camera can still see it). In the illustrations below, the Intersense camera is mounted to bottom of the camera rig and is looking down. This works if the portable target boards are on the floor.

Portable Targets on the Floor

These targets are printed to a size suitable for handheld or small crane tracking. If the camera gets too high than it may not find the fiducials. Below is an illustration of the Field of View cone of the intersense camera.

Dolly Shot

Because of the flexibility of placing the portable target boards, tracking becomes easier for a wider variety of short. An example would be tracking for a dolly shot.

 

Process

  1. Mount targets to rigid substrate
  2. Place targets as desired on location for best camera tracking
  3. Set up surveyor / total station
  4. Establish Origin and Backsite
  5. Make sure the fiducial boards are secure in their environment
  6. Survey the 3 points per used fiducial target board
  7. Export the Survey file to a .TXT file format
    1. Use the “North, East, Elev, Desc” setting for “Coordinate Order” when exporting from SurvCE
  8. Use the Constellation Tool to generate your CFG, cones and extra points. (refer to the Constellation Tool page for more information)
  9. Load the newly created .cfg file and send it to the Intersense camera
  10. Position IS1200 on the camera rig so it can see the targets keeping the LEMO connections coming off the right side. (Front on the is1200 will be on the back, and back on the front
  11. Make Intersense orientation pitch a negative value.
  12. Adjust camera sensor offsets to reflect the position of the camera realitive to the IS1200. For more info see “Camera Offsets”

 

Requirements

 

  • ¬†Each target board must be mounted to a rigid substrate

How to Survey

Each board has three unique survey points. Only these points should be surveyed for each board. Surveying additional fiducial points on the board will have no affect when creating the final constellation and orientation. These unique survey points per board are the:

  1. Top Left
  2. Bottom Left
  3. Bottom Right

An example of this is illustrated below with Board A:

Make sure your exported survey file is exported from SurvCE with the point values in the following order: “North, East, Elev, Desc”

Survey the Fiducial NOT the “A1″ Mark

It is important to note that the fiducials are the targets that need to be surveyed on these boards, and NOT the A1, A2 or A3 marks next to them. When surveying the fiducial, the A1, A2 and A3 marks are the “descriptions” used to identify the surveyed fiducials in SurvCE. The illustration below should assist:

Another illustration to further clarify

How to use with SurvCE

A Completed Survey

A completed survey file may look like the example below. Notice the presence of both the ORIGIN and BACKSITE. These two points are still necessary to determine world center and world orientation. The additional FLOOR1 point could be used as a physical reference point by which to integrate your CG elements at shoot time.