iphone a jeho funkce

V telefonu je umístěn tříosý^[3] akcelerometr sloužící jako senzor polohy, díky němuž se automaticky přepíná zobrazení na výšku a na šířku podle skutečné polohy přístroje. V iPhonu 3GS přibyl k určení polohy tříosý magnetometr (digitální kompas). V telefonu se také nachází senzor dopadajícího světla, který určuje jas obrazovky. iPhone obsahuje celkem 4 fyzická tlačítka a jeden přepínač: na přední straně tlačítko Home (Domů), na levé straně dvě tlačítka pro ovládání hlasitosti a dvoupolohový přepínač tichého a hlasitého módu a na horní straně uspávací/vypínací tlačítko. Všechny ostatní funkce se ovládají pomocí dotykového displeje.


***


Welcome to ARTag! ARTag is an "Augmented Reality" system where virtual objects, games, and animations appear to enter the real world. 3D graphics is added in real time to video, similar to "view matching" in Hollywood, except that with Augmented Reality it is happening online. ARTag "Magic Lens" and "Magic Mirror" systems use arrays of the square ARTag markers added to objects or the environment allowing a computer vision algorithm to calculate the camera "pose" in real time, allowing the CG (computer graphics) virtual camera to be aligned. This gives the illusion of 3D animations or video games to appear to belong in the real world.
Augmented Reality
What is "Augmented Reality"? Augmented Reality is virtual reality added to real imagery, imagine a camcorder where as you look through the viewfinder, you see some computer generated 3D objects drawn on top of the video picture. For example virtual chess pieces could be drawn on top of an empty chess board. The computer must know where the camcorder is relative to the chess board in order to know how to "augment" the image correctly. One way to achieve this is to put marker patterns in the scene, when this marker is recognized in the camera image, the computer rendering the virtual chess pieces knows what position and angle to render them and draw them over the camera image so that it appears natural to you looking through the viewfinder.
A more concise definition is: Augmented Reality (AR), also known as "Mixed Reality" is where virtual and real objects appear together in a real time system. A prominent meeting place and showcase for AR technology is the annual international conference ISMAR http://www.ismar06.org/ .
AR requires aligning a virtual camera with the real one, and overlaying or combining the imagery for both, to be displayed on some computer monitor, hand-held or wearable display. Tracking the real camera pose is a fundamental part of AR. The system can be simplified if computer vision is used to find the camera pose, instead of some expensive specialized external sensors (acoustic, LED, RF, magnetic). AR is increasing becoming a field where computer vision and graphics meet. artoolkitis a system invented by Hirokazu Kato that uses computer vision and markers to achieve AR using just a video or webcam. ARToolkit was created several years ago and achieves good functionality with limited processor power, ARToolkit has been used and is still used by many graduate students. ARTag was inspired by ARToolkit, but came out later in Nov 2004 taking advantage of the increased computing processing power available. ARTag uses more complex image processing and digital symbol processing to achieve a higher reliability and immunity to lighting (see comparisons ).
There are two ways to use ARTag AR; "Magic Lens" and "Magic Mirror". With a "Magic Lens", a user holds a tablet PC, PDA, or camera cell phone (or any computer device with a dispay and camera) and looks "through" it to see the mixture of real and virtual reality. A Magic Lens system is mostly a private experience, every user needs their own hardware, whereas in a "Magic Mirror" system a single video camera looks out from near a large screen and users see their "reflection" with 3D content added.
AR with the "Magic Lens" metaphor brings 3D computer data into the real world instead of forcing humans to go into the computer world, moving a camera, object, or tablet PC/PDA around is more intuitive than learning key and mouse actions to move around a virtual environemnt.

***