Pico Projectors

Multiple calibrated pico-projectors mounted inside the spherical display provide a seamless backprojected display.

Optical Tracking

Optical tracking support head-coupled rendering to provide parallax-based 3D depth cues and wireless interaction devices.

Interactive

Spheree supports direct interaction techniques with gesture and a stylus, and integration with 3D softwares and game engines like Blender and Unity.

Spheree illustrates that calibrated, multiple projector spherical displays
represent the future of interactive, scalable, high resolution non-planar displays.

How it Works

We developed a novel multiple pico-projector system that automatically calibrates and blends using a camera+projector approach. This creates a uniform pixel space on the surface of the sphere.

Our auto-calibration algorithm uses a spherical modification of [Teubl et al. 2012], which uses a simple webcam. This same webcam is used to calculate the parametrization of the spherical screen for the correct view-point rendering of a scene from the head-coupled viewer.

Spheree is highly scalable allowing as many projectors as needed for virtually any sphere size. Our spherical display design has no corners, hence no singularities in blending, and provides uniform pixel density across the whole sphere. Additionally, no mirrors are used so there are no blind spots. We only use lenses that come with the pico-projectors, rather than special ones such as fish-eye lenses, simplifying rendering.

Spheree supports bi-manual gesture, hands-free and moving-the-display interactions. We coupled Spheree to a 3D modelling package, Blender, to illustrate its use in a 3D modelling workflow. People can use a 3D modelling environment or capture real objects, such as designs moulded with clay, and easily put them inside Spheree.

We have tested a 20" diameter, eight pico-projector and a 7", four pico-projector Sphere. The 20" Spheree allows participants to experience and interact with 1:1 models of human sized objects. The small spheree can be held in your hands; thus, users are able to pick it up and interact with the models inside.

 

 

Media

Press Clipping

 

 

Researchers

Fernando Ferreira, Marcio Cabral, Olavo Belloc,
Gregor Miller, Celso Kurashima, Roseli de Deus Lopes,
Ian Stavness, Junia Anacleto, Marcelo Zuffo and Sidney Fels

USP

University of Sao Paulo

USASK

University of Saskatchewan

UFSCar

Federal University of Sao Carlos

UBC

University of British Columbia

UFABC

Federal University of ABC

Staff

André Montes, Gabriel Roque, Luiz Paulucci, Marcio Almeida, Mario Nagamura, Rodrigo Ferraz, Rosana Pinheiro and Rose Saçashima

POLI

Polytechnic School of University of Sao Paulo

LSI

Laboratory of Integrated Systems EP-USP

CITI

Interdisciplinary Centre of Interactive Technologies USP

CAVERNA Digital

Caverna Digital LSI-EP-USP

In Collaboration With:

HCT

Human Communitacion Technologies

LIA

Laboratory of Advanced Interaction

GRAND

Graphics, Animation and New Media

MAGIC

MAGIC

Funding

FAPESP

Sao Paulo Research Foundation

CNPQ

National Council for Scientific and Technological Development

NSERC

Natural Sciences and Engineering Research Council of Canada