CharuCo Targets
CharuCo Targets
CharuCo Targets
CharuCo Targets
CharuCo Targets
CharuCo Targets
CharuCo Targets
CharuCo Targets
CharuCo Targets
CharuCo Targets

CharuCo Targets

Regular price €111,00 Sale

CharuCo Targets

 In CharuCo targets, fields are uniquely encoded, which makes it possible to calibrate using a partly occluded or with a non-ideal target location. It also improves robustness against image noise. These properties allow recording information from the very edges of images, which is ideal for accurate and robust determination of lens parameters. Also, the unique coding of feature points allows for stereo calibration in which corners may be partly non-visible.

CharuCo detection is implemented in the OpenCV 3 and OpenCV 4 contrib module, but is also available as a stand-alone library.

Our default selection of CharuCo targets use the DICT_5x5 dictionary. If your application requires further customization, please contact us, and we are able to accommodate any customizations of CharuCo boards. You can also provide a PDF drawing of your completely custom pattern.

To mount these targets on tripod, frames or fixtures, see Mounting Fixture. 

 

Aluminium composite targets

Our larger sized calibration targets are made from aluminium/LDPE composite sheets which offers excellent flatness and stiffness, while being lightweight. Additionally, the composite material offers good thermal stability and corrosion resistance.  

The patterns are transferred to the composite material using a specialised precision direct UV (Ultra-Violet) printing process resulting in a durable matte finish. Through extensive testing, we have found this process to be ideal for machine vision applications, where both accuracy, good optical performance and physical robustness are of utmost importance.

To mount these targets on tripod, frames or fixtures, see Mounting Fixture.

Ceramic targets

For ultimate absolute accuracy requirements and smaller FOVs, we offer ceramic targets. These are extremely flat, have close no to thermal expansion, and are manufactured on semi-conductor clean-room lithography lines.

In order to provide good, matte contrast without specular highlights, we use a specially coated blue chrome coating on a white alumina ceramic substrate. Feature-to-feature dimensional accuracy is better than 2μm.

Please note: we are also able to manufacture ceramic calibration targets with other patterns or designs at dimensions up to 400x400mm. NRE costs apply. Please submit a quote request if interested.

Precision Manufactured

All of our calibration targets are made from aluminium/LDPE composite which offers excellent flatness and stiffness, while being lightweight. Additionally, the composite material offers good thermal stability and corrosion resistance.  

The patterns are transferred to the composite material using a specialised precision direct UV (Ultra-Violet) printing process resulting in a durable matte finish. Through extensive testing, we have found this process to be ideal for machine vision applications, where both accuracy, good optical performance and physical robustness are of utmost importance.

 

Sizes

The following sizes are available:

Size [mm] Size [inches]
800 x 600 x 6 31.496 x 23.622 x 0.236
600 x 400 x 6 23.622 x 15.748 x 0.236
400 x 300 x 6 15.748 x 11.811 x 0.236
300 x 200 x 6 11.811 x 7.874 x 0.236
200 x 150 x 6 7.874 x 5.905 x 0.236

Patterns

We offer two pattern options, Fine and Coarse, which have been specifically designed to work optimally with high (Fine) and low (Coarse) resolution cameras. The following tables illustrate the available options:

Fine (Aluminium composite)

Plate Size [mm] Checker Width [mm] Marker Width [mm] Rows x Columns
800 x 600 x 6 30 23 18 x 25
600 x 400 x 6 20 16
18 x 29
400 x 300 x 6 15 12
18 x 25
300 x 200 x 6 10 8
18 x 29
200 x 150 x 6 7.5 6
18 x 25

 

Fine (Ceramic)

Plate Size [mm] Checker Width [mm] Rows x Columns
150 x 100 x 3 5 15 x 24
100 x 75 x 3 3.75 15 x 22
75 x 50 x 3 2.5 15 x 24

  

Coarse (Aluminium composite)

Plate Size [mm] Checker Width [mm] Marker Width [mm] Rows x Columns
800 x 600 x 6 60 47 9 x 12
600 x 400 x 6 40 31
9 x 14
400 x 300 x 6 30 23
9 x 12
300 x 200 x 6 20 16
9 x 14
200 x 150 x 6 15 12
9 x 12

  

Aluminium Composite Technical Specifications

Weight 6.6 kg/m²
Outdoor Lifetime up to 3 years
Temperature Resistance -50 °C to + 80 °C  [-58 °F to +176 °F]
Specified temperature 20 °C (ISO 1:2016)
Linear thermal expansion ~24 μm /(°C · m)
Rigidity E·J

3840 kNcm2/m

 

Ceramics Technical Specifications

Temperature Resistance -50 °C to + 200 °C  [-58 °F to +392 °F]
Specified temperature 20 °C (ISO 1:2016)
Linear thermal expansion ~7.2 μm /(°C · m)