[ros-users] Calibration Plate

[von Wichert, Georg]

For good calibrations the pattern should be as planar as possible, cardboard as a carrier might actually be a little problematic, we used particle boards instead.

Another option is to use the nearest internet photoservice and let them print the pattern on "aluminum dibond". Depending on the service provider the scaling can vary, so it s best to call them in advance and ask for the best method to preserve the size. Otherwise the dimensions have to be measured afterwards.

-----Original Message-----
From: ros-users-bounces at code.ros.org [mailto:ros-users-bounces at code.ros.org] On Behalf Of Bill Morris
Sent: Tuesday, November 02, 2010 11:41 PM
To: User discussions
Subject: Re: [ros-users] Calibration Plate

On Tue, 2010-11-02 at 13:39 -0700, Hang Dong wrote: 
> We are looking for a high quality calibration target (something beyond 
> pdf printout pasted on a plate) like the 4x4 checkerboard shown in the 
> pr2 calibration page:
> http://www.ros.org/wiki/pr2_calibration/Tutorials/Calibrating%20the%20
> PR2
> 
> Is it possible to purchase one directly from willow garage or a 
> distributor, or any hint one how to go about making one ourselves?
> 
> Thanks,
> 
> Hang

We make ours by printing the checkerboard on a large sheet of paper then using a spray adhesive like "Super77" to affix the paper to a piece of cardboard or foamcore.


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