AUGMENTED REALITY BRIEF, Slides of Management Information Systems

Download AUGMENTED REALITY BRIEF and more Slides Management Information Systems in PDF only on Docsity! Augmented Reality David Johnson What Is Augmented Reality (AR)? • A combination of – a real scene viewed by a user and – a virtual scene generated by a computer that augments the scene with additional information. – ARToolkit demo movie – T-immersion 2004 video Combining the Real and Virtual Worlds We need: • Precise models • Locations and optical properties of the viewer (or camera) and the display • Calibration of all devices • To combine all local coordinate systems centered on the devices and the objects in the scene in a global coordinate system Combining the Real and Virtual Worlds (cont) • Register models of all 3D objects of interest with their counterparts in the scene • Track the objects over time when the user moves and interacts with the scene Realistic Merging Requires: • Objects to behave in physically plausible manners when manipulated • Occlusion • Collision detection • Shadows Failures in Registration Failures in registration due to: – Noise • Position and pose of camera with respect to the real scene – Image distortions – Time delays • In calculating the camera position Display Technologies • Monitor Based – Laptops – Cell phones – Projectors (more Ubiquitous Computing) • Head Mounted Displays: – Video see-through – Optical see-through Monitor Based Augmented Reality • Simplest available • Treat laptop/PDA/cell phone as a window through which you can see AR world. • Sunglasses demo Video see-through HMD Head Tracker Head locations Video cameras ~ 4 Real ™~ World generator Monitors Graphic images Video compositor Combined video  Advantages of Video see-through HMD • Flexibility in composition strategies • Real and virtual view delays can be matched Advantages of Optical see-through HMD • Simplicity • Resolution • No eye offset Early Application • Later – “architectural anatomy” - movie • Tourguide - movie More Mechanical • ECRC UNC - Medical • Early 90’s • Lots of work on reducing registration error – Explain movie – Teapot movie • Medical applications – movie AR Games • ARQuake AR • Lots of new applications • Will discuss some tracking systems next class