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Published byCaren Harper Modified over 9 years ago
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Josh Stephens Comp 6620
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Characteristics Degrees of Freedom: particular, independent way that a body moves in space Input type/Frequency of data: Discrete: single data value (e.g. Boolean value) Continuous: generate multiple data valuse (e.g. pixel coordinates) How much physical interaction is required. Purely active: require user to perform some form of physical activity Purely passive: does not require physical activity, continues to operate even when untouched Intended Use: position/orientation information, produce real number values, indicate element of a set
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Categories Desktop input devices Tracking devices 3d mice Special purpose input devices Direct human input
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Desktop Input Devices Keyboards 2d mice and trackballs Pen-based tablets Joysticks 6-DOF devices for desktop
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Keyboards Traditional desktop input device Discrete Chord keyboard Held in one hand User presses combinations of keys for a single alphanumeric input
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Chord Keyboard
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2d Mice and trackballs Made popular by WIMP interface design 2 components: Manually continuous 2d locator for positioning a cursor and generating 2d pixel coordinates Set of discrete components Relative devices: report how far they have moved rather than where they are Trackball more feasible for 3d environments
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Pen-Based Tablets Same as mice and trackballs, except with the addition of a manually continuous component Use of a stylus to generate 2d coordinates “pen and paper” interface
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Joysticks Traditionally used on desktop Combination of manually continuous 2d locator and a set of discrete components Isotonic Joystick: Cursor typically continues moving in the direction the joystick is pointing Isoteric Joystick: large spring constant so they cannot be perceptibly moved. Output varies with the force the user applies to the device
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6 DOF Input Devices Move objects dynamically in 3 dimensions Useful in manipulating virtual objects
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Tracking devices Motion trackers Eye trackers Data gloves
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Motion Tracking Magnetic tracking Mechanical tracking Acoustic tracking Inertial tracking Optical tracking Hybrid tracking
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Eye Tracking Purely passive input devices used to determine where the user is looking Uses corneal reflections detected by a camera Electro-oculography: measures the skin’s electric potential differences using electrodes placed around the eye
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Data gloves Bend sensing gloves: detect hand postures Pinch Gloves: determines if a user is touching 2 or more fingertips together
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3D Mice User physically moves them in 3d space Handheld Place motion trackers inside a structure http://www.youtube.com/watch?v=R-TBi3EfvEU User Worn Makes the device an extension of they user’s hand http://www.youtube.com/watch?v=fMeLZ8mAY5g
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Direct Human Input Obtain data directly from signals generated by the human body. User becomes the input device. http://www.youtube.com/watch?v=QIqNdMqA7Kc
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