Camera suite
The APRIL camera calibration suite is now available in the master branch of the APRIL Robotics Toolkit. Located in april.camera, this suite computes accurate camera calibrations and results are more repeatable than popular alternatives like OpenCV (as determined by human trials). A 2D grid of AprilTags is required for calibration and removes the need for observing the entire calibration target for detection. Interactive single-camera calibration via AprilCal is great for novices and experts alike and provides target position suggestions to ensure highly-accurate calibrations. Flexible multi-camera calibration is also supported without interactive suggestions
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Calibration targets
We recommend mounting these targets on foam poster board. It can usually be done quite cheaply and quickly (about $5/ sq ft), for example at Kinkos. If you can find out the email address for your local FedEx Office, usually formatted country###@fedex.com, you can use the following as a template to order by email:
Hi, I would like to print ## copies of the 8.5x11in-tag-mosaic-1.5in.pdf on a foam mounted matte paper, (I was quoted 5/sq ft for the foam mounting, plus printing) The file is a 72dpi raster; it's important that if it is resized (e.g. to 300dpi), that no interpolation/resampling is done to ensure a crisp transition from black to white on the borders. Please let me know when I can get them, and/or contact me if you have questions. Also, I won't need to see a proof, assuming the final output preserves crisp transitions from black to white. Thanks! Your Name Cell: +1 (555) 555-5555 Attachments: 8.5x11in-tag-mosaic-1.5in.pdf