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...und a (veryssmall) device. Our technique provides robust, inexpensive,sand wireless input from fingers, without requiring poweredsexternal components.sOther potential approaches have employed cameras =-=[10]-=-,smicrophones [5], proximity sensors [2], magnetic tags [7],sand accelerometers [3]. Each of these can potentially operate in small spaces, but suffer from at least some drawbacks, e.g.: how to integr...

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...eality on mobile phones has only recently become possible due to increased processing capabilities of modern smart phones. First approaches were based on optical flow based methods such as TinyMotion =-=[35]-=-. Our own previous work [33] marks the first real-time 6DOF pose estimation from natural features on a mobile phone. However, none of these works addresses wide area tracking. 2.2 Vision based localiz...

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... can listen to the closure part of the “cliff-hanger”. Spell-Casting through Gesture Recognition The gesture recognition process is supported primarily through camera-based motion estimation as in [1]=-=[9]-=-. As motion samples are collected, they are rendered to the screen to allow players to see their gesture progress. After the gesture is complete, the motion trail is normalized and the data is passed ...

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...h the display, which introduces some non-negligible delay in the visual feedback. Camera-based interaction with the above mentioned interfaces can be understood in terms of a Fitts’ task. Wang et al. =-=[22]-=- show that optical flow processing on a camera phone follows Fitts’ law. For both magic lens and dynamic peephole pointing the fundamental components of interaction are rapid precise movements towards...

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...t yet interactive. This lack of interactivity may change with the increasing proliferation of high-power handheld devices (mobile phones, PDAs, MP3 players), which enable new forms of use (e.g. [2][4]=-=[7]-=-). However, despite the emergence of new technology that allow users to interact with large displays, much past research has found that motivating people to interact with these displays in a public sp...

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... codes on paper, and HotPaper [5] needs several sentences of western text for identification. The recent advances in content-based document recognition algorithms [16, 28], cell phone motion gestures =-=[13, 29]-=-, touch interfaces [11, 27] and hardware production pave the way to new approaches. We present PACER (Paper And Cell phone for document Editing and Reading), an interactive paper system featuring a ca...

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...ding to Fitts’ law [1], the duration of such movements (t) is systematically dependent on the distance to the target (D) and the target’s width (W) as follows: t = a + b log2(D/W + 1) (1) Wang et al. =-=[9]-=- show that Fitts’ law is applicable to target acquisition tasks in which the phone UI is controlled using optical flow motion sensing. Rohs and Oulasvirta [6] propose a modified Fitts’ law model for t...

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... They suggest that tilt should be included in commercial games on these platforms. One of the few empirical studies of general tilt-based interaction uses a camera-based approach for detecting motion =-=[18]-=-. Although tilt is usually implemented using an accelerometer, Wang et al. [18] used vision-based motion tracking software and proposed several interaction tasks to use it. These include a point-selec...