ART markers are available in different sizes, coated and uncoated, active or passive


Active and passive versions available

Active markers are infrared light emitting elements, mostly LEDs. All active markers provided by ART are just emitting radiation when the tracking cameras are sensitive, thus have to be synchronised with the cameras. Synchronisation can be done by a wired connection between the tracking system and the electronics controlling the active markers, but can also be done in a wireless way: For wireless synchronisation a coded IR flash is sent out by a tracking camera. The active markers’ electronics recognise the coded flash and activate the LEDs.

Passive markers are retroreflective, i.e. they reflect the incoming IR radiation into the direction of the incoming light.

Both active and passive markers will give the 3DOF (3 degrees of freedom), and can be either spherical or flat.

Active Markers

In ART tracking systems four types of LED-based active markers are used, depending on the application.
All active markers provided by ART are controlled by special electronics and need power supply.

Single LEDs

  • Simple and robust markers providing visibility up to long distances within a ca. +/- 60° angular range of visibility
  • Can be covered with acrylic protection sheets
  • The dimension for the single LED is 3.4 mm x 2.8 mm

Single LEDs with diffuser sphere

  • For optimum angular range of visibility at limited distances

Big active spherical markers

  • Several single LEDs per marker, covered with light scattering spheres
  • Provide visibility from all sides and up to very long distances
  • Diameter 50 mm, weight 50 g

Big active flat markers

  • Several single LEDs per marker, covered with light scattering surface
  • Provide tracking up to very great distances, within an angular range of visibility less than 180°
  • Suitable for outdoor tracking
  • Special features: magnetic base for easy positioning on metal surfaces
  • Diameter 30 mm

Evaluation Kit Active Markers

AMC (Active Marker Controller) for active markers

The active target set for active markers consists of the active marker controller (AMC) and the single active markers. The markers can be synchronised optically or via cable. Up to 6 active markers can be connected to the AMC.

Passive Markers

The passive markers most commonly used in tracking systems, including ART’s, are retroreflectors (see picture above). These markers reflect incoming IR radiation back in the direction of the incoming light.

More precisely the IR radiation is back-reflected into a narrow range of angles around the source of the incoming light. These markers are mostly spheres covered with retroreflecting foils, but can also be stickers made from retroreflecting material.

Retroreflecting sheets or foils available on the market can be based on two different optical principles:

  • Three mirrors, arranged in 90° angles to each other, reflect light in the described way. Mostly foils with arrangements of lots of very small mirrors in a plane are used.
  • Glass balls (with appropriate refraction index) focus incoming light onto the opposite surface of the ball. A layer of microscopic glass balls, carried by a reflecting material, acts as a retro reflector. These foils can be fabricated on a flexible carrier material, thus they are widely used for equipping spherical markers with retroreflecting surfaces.

Spherical Markers

Spherical markers are plastic spheres with a precisely centric M3 threaded insert, which are hand-coated with a highly retro-reflective film, for the most accurate optical tracking possible (see picture above).

They are also available as a coated version with a robust surface. We provide these coated markers in the following sizes: 14 mm and 16 mm.

Available sizes (mm/inch): 12 (30.2), 14 (35.3), 16 (40.3), 20 (50.4), 30 (75.6).

Flat Markers

Flat markers are pre-cut circular pieces of self-adhesive retro-reflective film.
Available sizes (mm/inch): 10 (25.2), 12.5 (31.5), 15 (37.8), 20 (50.4).

Ring Markers

Ring markers can be fitted on almost any cylindrical object such as torque wrenches or screw drivers.
Sometimes tracking of tools with flexible parts is required, in order to find the exact position of the tool tip. With special calibration and tracking algorithms it is possible to account for the motion of the extension and track the tool tip with a precision of less than 5 mm.

Technical data

You can combine this product with these products


Our tracking software for any VR/AR application

All ART systems have been designed around an integrated and adaptable architecture that provides reliable and accurate motion tracking for immersive projection systems, wide area HMD tracking and many other VR applications.


Small and unobtrusive, but powerful

ART is well known for adaptions to users' requirements. Regarding the brand new ARTTRACK6/M the need for a small and powerful camera that can be used in limited spaces and compartments was very high, especially from the developments…

ARTTRACK5 in use


Industry standard for immersive 3D for large tracking volumes, accurate and stable

ARTTRACK5 is the next generation of our ARTTRACK camera family, the standard for immersive 3D applications in industry and research.
ARTTRACK5’s enhanced features offer higher…


Best solution for medium-sized tracking volumes

TRACKPACK/E camera is our best solution for medium-sized tracking volumes with a respectable frustum volume of 60m³. It is compatible with ARTTRACK5 and ARTTRACK5/C, and users can add up to 8 cameras to one ART Controller…


plug & play tracking solution for small volumes

Two tracking cameras and the controller are fully integrated in one housing. When delivered, SMARTTRACK3 is pre-calibrated and may be used immediately. This and its compact size make…

ART Controller

Suitable for ART TRACKing systems

The ART Controller is available in a single variant for the housing and it is rack-mountable (19" housing). In case no rack will be available at the customer’s site it’s also possible to place the ART Controller on a table for example…


YOur PLUS for interaction

2+ is more than 2, and also more than 3! We have improved our bestseller for interaction Flystick2 with sophisticated details and new features. Many wishes of our customers and partners have been taken into account by our developers. Flystick2+ convinces with…


vibro-tactile or pure

The Fingertracking device is an add-on to the ART tracking system, which allows you to track the orientation of the hand and the position of the fingers.

Measurement Tool

For high precise point measurements

The ART Measurement Tool is a pointing device for measurement applications. In this specialized field it is very important to measure positions of points with a high degree of accuracy.

Motion Capture

Digitizing of Movements

Motion Capture ("mocap") is the technique of digitizing the movement of people, animals or objects. In the case of the ART Motion Capture system, markers are attached to the subject’s limbs and can be worn over normal…


Motion capture assistance tool

ART-Human is a tool to assist motion-capture projects. The software uses the information of our highly accurate 6 degree-of-freedom (6DOF) optical targets to track a human subject. We use 17 ergonomically designed targets which can be worn directly on…

ART Satellite Merger

Tracking inside occluded compartments

Do you need tracking in an occluded compartment inside your CAVE? For example in a closed car body inside the CAVE? Is this occluded compartment even moving during tracking operation?


Many geometries, also customized

Targets consists of several markers (minimum 4), and will give the 6DOF (degrees of freedom). Here also, we distinguish between passive and active types. In addition to our standard targets we offer several construction sets for your own targets and…