TOUCH SCREENS

Showing posts with label chapter7. Show all posts

Monday, February 28, 2011

Microsoft Surface Touchscreen Table Screen Interface at CES

From : http://www.youtube.com/watch?v=CkY4V_cuces&feature=player_embedded

Table Connect for iPhone

From : http://www.youtube.com/watch?v=TCbSwOgNzZg&feature=player_embedded

Touch Screens

A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touching the display of the device with a finger orhand. Touchscreens can also sense other passive objects, such as astylus. Touchscreen is common in devices such as all-in-one computers, tablet computers, and smartphones.

The touchscreen has two main attributes. First, it enables one to interact directly with what is displayed, rather than indirectly with a cursor controlled by a mouse or touchpad. Secondly, it lets one do so without requiring any intermediate device that would need to be held in the hand. Such displays can be attached to computers, or to networks as terminals. They also play a prominent role in the design of digital appliances such as the personal digital assistant (PDA),satellite navigation devices, mobile phones, and video games.

From: http://en.wikipedia.org/wiki/Touchscreen

Thursday, February 24, 2011

Input And Output Devices

From : http://www.youtube.com/watch?v=ZEyj-YorgxU

Output Devices

An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.
In computing, input/output, or I/O, refers to the communication between aninformation processing system (such as a computer), and the outside world. Inputs are the signals or data sent to the system, and outputs are the signals or data sent by the system to the outside.
Examples of output devices:

• Speakers

• Headphones

• Screen (Monitor)

• Printer

From: Computing Essentials, Complete 2011, Timothy J.O'Leary, Linda I.O'Leary 

Input Devices

An input device is any peripheral (piece of computer hardware equipment) used to provide data and control signals to an information processing system (such as acomputer). Input and output devices make up the hardware interface between computer as a scanner or 6DOF controller.
Many input devices can be classified according to:

• modality of input (e.g. mechanical motion, audio, visual, etc.)
• the input is discrete (e.g. key presses) or continuous (e.g. a mouse's position, though digitized into a discrete quantity, is fast enough to be considered continuous)
• the number of degrees of freedom involved (e.g. two-dimensional traditional mice, or three-dimensional navigators designed for CAD applications)

Pointing devices, which are input devices used to specify a position in space, can further be classified according to:

• Whether the input is direct or indirect. With direct input, the input space coincides with the display space, i.e. pointing is done in the space where visual feedback or the cursor appears. Touchscreens and light pens involve direct input. Examples involving indirect input include the mouse andtrackball.
• Whether the positional information is absolute (e.g. on a touch screen) or relative (e.g. with a mouse that can be lifted and repositioned)

Note that direct input is almost necessarily absolute, but indirect input may be either absolute or relative. For example, digitizing Graphics tablets that do not have an embedded screen involve indirect input and sense absolute positions and are often run in an absolute input mode, but they may also be setup to simulate a relative input mode where the stylus or puck can be lifted and repositioned.

Keyboards

A 'keyboard' is a human interface device which is represented as a layout of buttons. Each button, or key, can be used to either input a linguistic character to a computer, or to call upon a particular function of the computer. Traditional keyboards use spring-based buttons, though newer variations employ virtual keys, or even projected keyboards. Examples of types of keyboards include:
• Computer keyboard
• Keyer
• Chorded keyboard
• LPFK

Pointing devices

A pointing device is any human interface device that allows a user to input spatial data to a computer. In the case of mice and touch screens, this is usually achieved by detecting movement across a physical surface. Analog devices, such as 3D mice, joysticks, or pointing sticks, function by reporting their angle of deflection. Movements of the pointing device are echoed on the screen by movements of the cursor, creating a simple, intuitive way to navigate a computer's GUI.


Composite devices



Wii Remote with attached strap
Input devices, such as buttons and joysticks, can be combined on a single physical device that could be thought of as a composite device. Many gamingdevices have controllers like this. Technically mice are composite devices, as they both track movement and provide buttons for clicking, but composite devices are generally considered to have more than two different forms of input.
• Game controller
• Gamepad (or joypad)
• Paddle (game controller)
• Wii Remote

Imaging and Video input devices

Video input devices are used to digitize images or video from the outside world into the computer. The information can be stored in a multitude of formats depending on the user's requirement.
• digital camera
• Webcam
• Image scanner
• Fingerprint scanner
• Barcode reader
• 3D scanner
• Laser rangefinder

Medical Imaging
• Computed tomography
• Magnetic resonance imaging
• Positron emission tomography
• Medical ultrasonography

Audio input devices

In the fashion of video devices, audio devices are used to either capture or create sound. In some cases, an audio output device can be used as an input device, in order to capture produced sound.
• Microphone