What is Input?
-Input is any data instructions entered into the memory of a computer.Instructions can be entered into the computer in the form of programs, commands, and user responses.
-Input device is any hardware component that allows users to enter data and instructions into a computer.
The Keyboard
-an input device that contains keys users press to enter data and instructions into a computer.
-Most desktop computer keyboards have between 101 and 105 keys, function keys, CTRL keys, ALT keys, and arrow keys. A numeric keypad on the right side of the keyboard.
-The insertion point is a symbol on the screen that indicates where the next character you type will appear.
-An ergonomic keyboard has a design that reduces the chance of wrist and hand injuries. Ergonomics incorporates comfort, efficiency, and safety into the design of the workplace.
Mouse
-A mouse is a pointing device that fits under your hand comfortably. A mouse can be wired or wireless.
Other Pointing Devices : Trackball ,Touchpad ,Pointing Stick
Touch Screens and Touch-Sensitive Pads
-A touch screen is a touch-sensitive display device
Pen Input
With pen input, you touch stylus or digital pen on a flat surface to write, draw, or make selections.
Game Controllers
Video games and computer games uses a game controller as the input device that directs movements and actions of on-screen objects such as gamepads, joysticks and wheels, light guns, dance pads, and motion-sensing controllers.
Digital Cameras
A digital camera is a mobile device that allows users to take pictures and store them digitally. There are Studio cameras, Field cameras, and Point-and-shoot cameras.
Two factors affect the quality of digital camera photos :
-Resolution - is the number of horizontal and vertical pixels in a display device.
-Number of bits stored in each pixel - each pixel consists of one or more bits of data. The more bits used to represent a pixel, the more colors and shade of gray that can be represented.
Voice Input
-Voice input is the process of entering input by speaking into a microphone.
-Voice recognition is the computer's capability of distinguishing spoken words.
-Audio input is the process of entering any sound into the computer like : Speech, Music, Sound Effects.
Video Input
-Video Input is the process of capturing full-motion images and storing them on a computer's storage medium.
-A Web cam is a type of digital video camera that enables user to : Capture video and still images, Make video telephone calls, and add live images to instant messages.
-A video conference is a meeting between two or more geographically separated people.
Scanner and reading devices
-Optical character recognition (OCR) involves reading characters from ordinary documents.
-A turnaround document is a document you return to the company that creates and sends it.
-A bar code reader, also called a bar code scanner users laser beams to read bar codes.
- Magnetic stripe card readers read the magnetic stripe on the back of cards such as : Credit cards, Entertainment cards, Bank cards, Other similar cards.
Biometric input
-Biometrics authenticates a person’s identity by verifying a personal characteristic
-Fingerprint reader
-Face recognition system
-Hand geometry system
-Voice verification system
-Signature verification system
-Iris recognition system
-Retinal scanners
No comments:
Post a Comment