GEOCAL

GEOCAL is a geometric camera calibration device that uses a beam-expanded laser in combination with a diffractive optical element (DOE).

Application Context

Geometric camera calibration is essential for imaging systems in industries such as automotive, ADAS, and security, where accurate object detection in dynamic scenes is required. After calibration, camera systems can measure distances more reliably, detect objects more accurately, and compensate for geometric distortion, particularly in wide-field-of-view configurations. It also enables precise alignment of stereo camera pairs.

Advantages of GEOCAL

Conventional geometric calibration methods rely on printed test charts with regular patterns, which must be scaled to match field of view and working distance. In addition, many setups require relay lenses when compact designs or infinity-based calibration are needed.

GEOCAL eliminates the need for test charts and relay lenses, while enabling high-precision measurement of geometric distortion, intrinsic and extrinsic parameters, and stereo camera alignment. It can also be used without external illumination.

In addition to the standard GEOCAL, we also offer the GEOCAL XL. This version has a significantly larger output window with a usable aperture of Ø 155 mm as opposed to the standard Ø 77 mm. The GEOCAL XL is ideal for geometric calibration of cameras with large front lenses and for applications where the distance between the camera and GEOCAL is long (e.g., calibrating through a windshield).

The GEOCAL IR version extends the laser diode wavelength range to 935 nm, enabling geometric camera calibration in the near-infrared (NIR) spectrum. It has the same physical dimensions as the standard GEOCAL.

GEOCAL includes a desktop software for evaluating GEOCAL images of different file formats. It supports the most common distortion models, which can be easily configured for specific use cases. The precise measurement results are visualized with easy-to-understand graphics for quick evaluation. A function for correcting test images allows you to quickly visually verify the quality of the calculated distortion parameters. A concise overview of all GEOCAL software changes is available here.

An API is also available, enabling integration of GEOCAL functionality into custom software, production line solutions, or device testing applications.
Both the software and API are compatible with GEOCAL XL.
For more information on the API, please contact our sales team.

Download software:

GEOCAL Software (Windows 64bit installer)

Important compatibility note

The laser wavelength of standard GEOCAL and GEOCAL XL has been updated from 633 nm to 638 nm.
All standard GEOCAL units from GC-10045 and all GEOCAL XL units from GC-XL-10013 onwards use the updated wavelength.

Software version 1.5.0 includes default configuration files for GEOCAL systems with 633 nm, 638 nm and 935 nm (IR).

Please refer to Section 10.11 of the manual for detailed instructions.

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