Input Devices What Is Input What is input

Input Devices

What Is Input? What is input? DATA Bradley Kinkade 42 hours $12. 50 per hour v Data • Unprocessed facts, figures, and symbols v Instructions • Programs • Commands • User responses ct ct e r r o o e c ot c r S es a re n E S ntri s a N O rd e trie P S ca en E R ime ard t ec R E e h S ard US s, t e tim D N ec S Ye , th A m M i M et A No M R h G rd CO int t O a pr PR ec tim hard disk INSTRUCTION

What are Input Devices? What is an input device? v Any hardware component used to enter data, programs, commands, and user responses into a computer voice input video input keyboard scanners and reading devices pointing device digital camera

The Keyboard How is the keyboard divided? v Typing area v Numeric keypad v Function keys function keys typing area numeric keypad

The Keyboard What is a portable keyboard? v Full-sized keyboard you conveniently can attach and remove from a handheld computer unfolded keyboard

The Keyboard What is an ergonomic keyboard? v Designed to minimize strain on hands and wrists ° Ergonomics incorporates comfort, efficiency, and safety into design of items in workplace

The Keyboard What are alternative forms for commands? v Many programs allow you to use button, menu, or function key to obtain same result Command Button Menu Function Key(s) Copy Edit|Copy SHIFT+F 2 Open File|Open CTRL+F 12 Print File|Print CTRL+SHIFT+F 12

Mouse What is a mouse? mouse v Pointing device that fits under palm of hand v Controls movement of pointer, also called mouse pointer, on screen v Pointer on screen takes several shapes I-beam block arrow pointing hand

Mouse mouse pad How did a mechanical mouse work? v Rubber or metal ball is on its underside v Movement of mouse translates into signals computer understands mouse buttons wheel button ball

Mouse How does an optical mouse work? v Senses light to detect mouse’s movement v More precise than mechanical mouse v Connect using a cable or wireless wheel button back button forward button optical sensor

Other Pointing Devices What are common mouse operations? v Point v Click v Right-click v Double-click v Drag v Right-drag v Rotate wheel v Press wheel

Other Pointing Devices What is a trackball? trackball v Stationary pointing device with a ball on its top v To move pointer, rotate ball with thumb, fingers, or palm of hand

Other Pointing Devices What is a touchpad? v Small, flat, rectangular pointing device sensitive to pressure and motion touchpad

Other Pointing Devices What is a pointing stick? v Pointing device shaped like pencil eraser positioned between keys on keyboard pointing stick

Other Pointing Devices joystick What are a joystick and a wheel? v Joystick is vertical lever mounted on a base v Wheel is steering-wheel type input device v Pedal simulates car brakes and accelerator wheel pedal

Other Pointing Devices What is a light pen? v Handheld input device that contains light source or can detect light ° Press light pen against screen surface and then press button on light pen

Other Pointing Devices What is a touch screen? Touch areas of screen with finger v Often used with kiosks v touch screen

Other Pointing Devices What is a stylus? Looks like a ballpoint pen, but uses pressure to write text and draw lines v Used with graphics tablets and handheld computers v stylus or pen

Other Pointing Devices What is an electronic signature? v Pen and graphics tablet used with special software for handwriting recognition v Legal as ink signature v Also called e-signature

Other Pointing Devices What is handwriting recognition software? v Translates handwritten letters and symbols into characters that the computer can understand

Voice Input How does voice recognition work? Step 1: Dictate You’re right! Natural Language Engine …Your write …You’re right …Your right Step 2: Convert analog to digital Step 4: Most likely match selected Step 3: Check database for match your, you’re Matches right, write

Voice Input What is a MIDI? v External device, such as electronic piano keyboard, to input music and sound effects

Input Devices for Handheld Computers How is a data entered into a handheld device? stylus voice input handwriting recognition characters stylus transfer data from desktop computer on-screen keyboard digital camera portable

Digital Cameras What is a digital camera? v Allows you to take digital pictures v Images viewable immediately on camera Download to computer ° Post pictures to Web °

Digital Cameras How does a digital camera work? 1: Take picture Step 1 2: Image focuses on CCD Step 2 3: CCD generates analog signal that represents image 4: Analog signal converts to digital signal Step 3 Step 4 5: Digital signal processor (DSP) adjusts quality Step 5 6: Transfer image to computer 7: View and manipulate image Step 6 Step 7

Digital Cameras What is resolution? Sharpness and clarity of image v Higher the resolution, the better the image quality, but the more expensive the camera v Pixel (picture element) is single point in electronic image v ° Greater the number of pixels, the better the image quality

Video Input What is video input? Process of entering full-motion recording into computer v Also called video capture digital video v ° ° Video capture card is expansion card that converts analog video signal into digital signal that computer understands Video compression analog video camera

Video Input What is a PC video camera? Digital video camera that allows home user to record, edit, and capture video and still images, and to make video telephone calls on Internet PC video camera v Also called PC camera v

Video Input What is a Web cam? Video camera whose output displays on a Web page v Also called a cam v ° Streaming cam shows moving images by sending continual stream of pictures Web cam video output

Video Input What is videoconferencing? v Two or more geographically separated people who use network on the Internet to transmit audio and video data ° Whiteboard is another window on screen that can display notes and drawings simultaneously on all participants’ screens

What is a scanner? v Device Scanners and Reading Devices that captures data directly from source document • Source document is original form of data OCR flatbed scanner

Scanners and Reading Devices How does a flatbed scanner work? 1: Place document face down 2: Bright light scans document 3: Image reflected into mirrors 4: Light converted to analog electrical and then to digital signal Step 1 Step 2 Step 3 5: Digital information sent to computer 6: Print or save document Step 4 Step 6 Step 5

Scanners and Reading Devices What are various types of scanners? Pen or handheld Flatbed Drum Sheet-fed

Scanners and Reading Devices What is image processing? v Capturing, storing, analyzing, displaying, printing, and manipulating images v Converting paper documents into electronic form v Also called imaging

Scanners and Reading Devices What is an optical reader? v Device that uses light source to read characters, marks, and codes and then converts them into digital data Optical character recognition (OCR) Optical mark recognition (OMR) Bar code scanner

What is an OCR font? v OCR Scanners and Reading Devices font, such as OCR-A, used with OCR devices v OCR device determines characters’ shapes by detecting patterns of light and dark v OCR software converts shapes into characters the computer can understand

Scanners and Reading Devices What is a turnaround document? v You return it to company that sent it numbers are read by OCR device when document is returned

Scanners and Reading Devices What is optical mark recognition (OMR)? v Reads handdrawn pencil marks, such as small circles or rectangles

Scanners and Reading Devices What is a bar code scanner? v Uses laser beams to read bar codes bar code scanners

What is a bar code? Scanners and Reading Devices v Identification code that consists of a set of vertical lines and spaces of different widths v Universal Product Code (UPC) Number system character identifies type of product Manufacturer identification number (Kellogg’s, in this case) Check character verifies accuracy of scanned UPC symbol Item number (10 oz. box of Froot Loops

Scanners and Reading Devices What is a magnetic ink character recognition reader (MICR)? v Can read text printed with magnetized ink v Banking industry almost exclusively uses MICR for check processing check number bank number account number check amount

Scanners and Reading Devices What is wireless input? v Handheld computer or device used to collect data wirelessly at the location where transaction or event takes place v Data transferred later to desktop computer through docking station

What input devices are available for those with physical limitations? keyguard for limited hand mobility onscreen keyboard speech recognition Input Devices for Physically Challenged pointing Users device for those with motor disabilities

Input Devices for Physically Challenged Users What are new developments in computing that will benefit physically challenged users? Gesture recognition • Computer will detect human motions • Computers with this capability have potential to recognize sign language, read lips, track facial movements, or follow eye gazes Implantation • For paralyzed or speechimpaired individuals • Doctor will implant computerized device containing transmitter into brain • As user thinks, transmitter will send signals to computer

PUTTING IT ALL TOGETHER What type of input devices do home users require? q. Enhanced keyboard or ergonomic Home keyboard q. Mouse q. Joystick or wheel q 30 -bit 600 x 1, 200 dpi color scanner q 1 - to 4 -megapixel digital camera q. Microphone q. Voice recognition software q. PC video camera

PUTTING IT ALL TOGETHER What type of input devices do SOHO users require? q. Enhanced or ergonomic keyboard q. Mouse q. Stylus and portable keyboard for handheld computer q 36 -bit 600 x 1, 200 dpi color scanner q 1 - to 4 -megapixel digital camera q. Microphone q. Voice recognition software q. PC video camera Small Office/Home Office

PUTTING IT ALL TOGETHER What type of input devices do mobile users require? q. Wireless mouse for notebook computer q. Trackball, touchpad, or pointing stick on notebook computer q. Stylus and portable keyboard for handheld computer q 2 - or 3 -megapixel digital camera q. Voice recognition software Mobile

PUTTING IT ALL TOGETHER What type of input devices do power users require? Power q. Enhanced or ergonomic keyboard q. Mouse q. Stylus and cursor for graphics tablet q 48 -bit 1, 200 x 1, 200 dpi color scanner q 3 -megapixel digital camera q. Microphone q. PC video camera

PUTTING IT ALL TOGETHER What type of input devices do large business users require? q. Enhanced or ergonomic keyboard q. Mouse q. Touch screen q. Light pen for point-of-sale terminals q 42 -bit 1, 200 x 1, 200 dpi color scanner q. OCR, OMR, bar code reader, or MICR reader q. Video camera for videoconferences q. Voice recognition software q. Microphone Large Business

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