Custom Products

Below you find a selection of custom calibration products which we have designed and manufactured in cooperation with some of our customers. These targets were made to fulfil special requirements pertaining to FOV, calibration speed, illumination wavelength, or mounting.

Should you be interested in one of these options, please request a quote or contact us and we can discuss your application and recommend the best solution.

 

Custom patterns

The largest group of custom products are specific patterns and sizes that we do not offer in our standard product portfolio. Examples of these are:

  • ChAruCo targets with different dictionaries and/or marker ids, enabling multiple boards to be detected simultanously in the same scene.
  • Circle/checkerboard targets with unique finder patterns, enabling partial observation and stereo-calibration.
  • Deltille grid patterns and other less common targets.
  • Single AruCo marker plates for VR and robot calibration purposes.
  • MacBeth color calibration targets.
  • Proprietary customer designed patterns. We keep these designs confidential of course and can sign an NDA is requested.

For these custom designs, pricing depends mainly on the size of the desired board, and whether camera-ready vector graphics (true to scale, pure vector PDF/SVG with page size equal to board size, text converted to paths) are provided. We gladly assist in preparing or redrawing customer designs for a fee, and always provide a final PDF proof for the customer to verify before production.

Special substrates

We offer a number of special substrates with added performance over our standard targets:

  • Honeycomb Aluminium - extremely rigid at larger sizes
  • Optical Glass/ceramic - very flat, can be patterned with ultra high accuracy
  • Carbon Fiber - very rigid, can be patterned with ultra high accuracy
  • Acrylic - semitransparent, suitable for backlit applications
  • Passive Thermal - allows for contrast with thermal cameras
  • Retro Reflective Substrate - ideal for robust detection with active sensors

Read more about these substrates in our knowledge base article Exploring Calibration Target Substrates

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Mounting options

For Alu/HDPE composite targets, we offer the highly versatile Mounting Fixture, which can also be bough for existing calibration targets.

We have realised a number of different mounting solutions for our customers:

  • Through-holes precisely machined into your targets according to customer's drawing.
  • Slotted aluminium frame protecting and stiffening target and providing mounting options.
  • Robotic flange adapter machined and epoxy-glued to calibration target
  • Cylindrical holes machined to exact depth on backside of target

 

Antireflective Coating

We have developed an antireflective coating process, which results in near Lambertian reflectance properties across a wide range of the visible and IR spectrum. This avoids coding errors due to reflectance differences, and is especially useful when calibrating active sensors or when lighting cannot be controlled.

The coating is very durable, scratchresistant and suitable for both indoor and outdoor use. 

Top: no coating - Bottom: AR coating

 


Frames / fixtures

Cameras should always be calibrated with the calibration target at the application’s working distance and also cover a rather large portion of the FOV in each single view. For large FOVs, we can manufacture targets up to 2500x1500mm in size. These need to be mounted into very rigid and flat frame structures. We can design and manufacture these structures for you or just deliver the plate insert. 

Pricing depends on size and complexity.

 

ChArUco Cubes

In multi-camera setups, extrinsic calibration can benefit from multiple calibration patterns (network calibration). With a cube structure, the target assembly is very rigid and the individual faces can be accurately calibrated by us before delivery. This allows for quick and accurate extrinsic calibration of multi-camera setups with opposing views.

Patterns can be individually specified. The cube mounts to standard 1/4''-20 or 5/8'' tripod interfaces depending on size. Can be constructed in sizes of 100mm to 500mm

 

3D calibration targets

While planar targets are the most common, we have also successfully employed the 3D calibration target design below. This allows accurate and precise calibration from as little as a single image, which is useful for e.g. factory calibration. Uncertainty in parameter estimates would be around 1% for a single image using a single radial coefficient camera model. Currently, this target design is manufactured upon individual customer request. Software code based on OpenCV can also be provided for this target.

Pricing and lead time: very dependent on physical size and individual requirements.

 

 


If you are interested in any of these options, please contact us, e.g. by using the request quote form.