Augmented Reality: Combining Real and Virtual Worlds, Summaries of Artificial Intelligence

Download Augmented Reality: Combining Real and Virtual Worlds and more Summaries Artificial Intelligence in PDF only on Docsity! Augmented Reality David Johnson What Is Augmented Reality (AR)? ¢ A combination of — areal scene viewed by a user and — avirtual scene generated bya 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 ica Auginedted Real pu | View World | {optional in satarao) Cam Position Video of + | Real Scana ' uses tad * | Video Graphic | Video |_| Syatam Objects Maraing 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 ra ¢ 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