Below you'll find some of the most common questions we receive about our products. Please feel free to contact us for custom inquiries or if in doubt.
Q: Do you offer shipping Internationally?
A: Yes. Please see our shipping information page for details.
Q: What are your lead times?
A: As all calibration targets are custom made the lead for manufacturing is up to 9 days. Shipping typically takes another week depending on the destination and your chosen shipping service. Please see our shipping information page for details.
Q: Who owns and operates calib.io?
A: We are computer vision researchers and entrepreneurs from Denmark, who for many years struggled to find high-quality calibration targets that were affordable for CV labs and companies. After evaluating different processes for calibration target manufacturing in terms of accuracy, price, and versatility, we found a reliable process for medium to large size calibration targets that are accurate, flat and very stiff. We established Calib.io I/S to make these products available to others facing the same challenges.
Q: Can you manufacture custom calibration targets?
A: This is definitely possible. Your desired calibration pattern should be emailed to email@example.com as a PDF file with the pattern defined as vector shapes (not rasterised) and text converted to shapes. The page size must correspond exactly to the desired calibration target dimensions. We recommend using our pattern generator for design and PDF generation. Pricing for custom targets will be approx. 50% more than our standard products (considering same dimensions). You will receive an individual quote before your order is sent to production.
Q: Which pattern type should I choose?
A: A number of factors affect your optimal choice of calibration target. First and foremost, the pattern type must be compatible with your software platform or library. Checkerboards are most widely supported, in e.g. OpenCV, Matlab's Computer Vision Toolbox, MVTec Halcon, and a large number of photogrammetry software packages. Circle targets can provide improved calibration quality due to a higher feature density. However, symmetric circle grids are not rotationally invariant, and hence not suitable for stereo calibration. In these cases, checkerboard or asymmetric circle grids can be used. Find more information in our knowledge base articles.
Q: Which target size is suitable for my application?
A: Generally, the target should fill most most of your camera's FOV (Field Of View) at the desired working distance. Capturing calibration information from the periphery of images is especially important for the determination of lens distortion parameters. However, most software packages require the entirety of the calibration target to be visible in all images. Find more information in our knowledge base articles.
Q: Should I choose the fine or coarse pattern type?
A: This depends mainly on the pixel resolution of the cameras to be calibrated and how well and uniformly the target is lit in the calibration situation. The coarse patterns were designed for cameras with resolutions below 3MPx, but given good rigid mounting and controlled lighting, the fine pattern will be detected quite robustly. Find more information in our knowledge base articles.
Q: What is the maximum plate dimensions you can manufacture?
A: We can manufacture plates up to 2500 x 1500mm. The plate thickness would be 6mm, and for large plates (with one dimension over 800mm) we recommend resting the plate on a rigid support.
Q: What is the dimensional accuracy of feature locations?
A: Our dimensional tolerance for feature point locations is 0.1mm + 0.3mm/m (at 20°C).
Q: Can I customize the text on the target?
A: Of course, we have done this for clients who wish to supply our targets together with vision-based product. Email us at firstname.lastname@example.org and we´ll be happy to accommodate.
Q: Do you offer high volume or academic discounts?
A: Yes we do, please email us at email@example.com .
Q: What is your return policy?
A: As most of our products are custom manufactured on demand, we cannot offer returns, unless the product is damaged in shipping or does not live up to our very high quality standards. Please note that every calibration target is carefully checked and inspected during production, so we do expect this situation to very rarely occur. In the unlikely event that your product is not operating as intended, please email us at firstname.lastname@example.org for a solution.