Multi-touch sensing surface for projection-based AR
Data di pubblicazione
21-08-2020
Codice
ME.20.028.A
Data di priorità
01-01-1970
Titolare
Politecnico di Milano
Dipartimento
Department of Mechanical Engineering
Autori
CASCINI Gaetano - CARUSO Giandomenico - BECATTINI Niccolò - MOROSI Federico
Descrizione
Spatial, or Spatially, Augmented Reality (SAR) is a relatively new approach for representing computergenerated
contents with high immersivity on the real environment. This is a technological variation of
the Augmented Reality (AR) paradigms and it has been developed to overcomes technical and
ergonomic drawback of Mixed Reality (MR) setups. In such systems, the augmentation of the physical
space is realized by projecting graphical information directly onto the external surface of objects without
any image planes in between. The use of a tracking system allows keeping the projection updated
according to the position and the orientation of the physical object.
The current invention can be applied in all those fields that require a fast and agile alteration of the
external visible features of a physical prototype or that need to visualize non-realistic information
spatially coherent with the same. The shape of tangible object, available with real or scaled dimensions
according to the needs, is used as a target surface for the projection and therefore it needs to be
manufactured with a neutral colour, uniform finishing and non-reflective material. The images,
generated for each of the projector included in the system, are then rendered by the control unit
according with (i) the silhouette of the prototype computed from its 3D digital model, (ii) the placement
data coming from the tracking system, (iii) the relative positions of the projectors, if more than one are
available, (iv) the rendering capability of the projectors in term of colour, brightness and resolution of
the light beams, (v) the external properties of the prototype surfaces and (vi) the modifications applied
by the user(s) on the digital contents.
Campo di applicazione
ICT technology
Vantaggi
he system presented in this patent benefits from the functionality provided by a state-of-the-art
technology to enable a novel tracking approach for the physical objects to be used in projection-based
SAR. For this reason, the following described technological advantages are referred with respect to
other tracking system commonly used in the same type of applications:
• It is insensitive to direct manipulations of the physical prototype that can alter the silhouette of the
same (as opposed to algorithms based on edges recognition);
• It allows to track all the translations and rotations that can be applied on a planar surface (as
opposed to turn tables or sensors embedded in the prototype itself);
• It allows a quick installation and an easy calibration of the hardware which becomes easily
transportable (as opposed to tracking systems based on optical, acoustic and magnetic sensors);
• It allows to avoid the use of physical markers attached onto the external surface of the physical
prototype which, although minimally, alter its silhouette (as opposed to tracking systems based
on optical sensors based on reflective IR markers);
• It allows to have neutral and monochromatic surfaces of the physical prototype, fundamental for
the fidelity of the colours that are rendered by the light beams of the projectors (as opposed to
algorithms based on the recognition of the surface textures);
• It allows to integrate within the multi-touch sensing surface an interactive graphical user interface
to apply any modifications on the projected digital contents.
Contatto
licensing.tto@polimi.it