Chapter 5, Input
Chapter 5 Objectives Explain how voice recognition works Describe two types of input Understand how to input data into a handheld computer List characteristics of a keyboard Identify uses of a digital camera Identify various types Chapter 5 of keyboards Describe various techniques used for video input Input Identify various types of pointing devices Describe uses of PC video cameras and Web cams
Explain how a mouse works Explain how scanners and other reading devices work Identify alternative input Next Describe different mouse types p. 5.2 devices for physically challenged users
What are Input What Is Input? DATA Devices? What is input? Bradley Kinkade 42 hours $12.50 per hour What is an input device? • Any hardware component used to enter data, •Data programs, commands, and user responses into a – Unprocessed computer facts, figures, video input and symbols ct re ct voice input or rre keyboard e c co S ar t E s no • Instructions S rie re N nt a O e es SP rd tri – Programs E ca en R e d R tim ar pointing SE e ec U , th im scanners – Commands es e t DS rd device Y th N ca o, e S and reading N MA tim M – User responses M e RA O th G devices C nt O d ri R ar p P ec tim Next hard disk Next digital p. 5.3 Fig. 5-2 INSTRUCTIONS p. 5.4 camera
The Keyboard The Keyboard How is the keyboard divided? What is a portable keyboard? • Typing area • Full-sized folded • Numeric keypad keyboard you keyboard • Function keys conveniently can attach and
function keys remove from a handheld computer
typing area unfolded Next Next keyboard p. 5.4 Fig. 5-3 numeric keypad p. 5.6 Fig. 5-7
1 The Keyboard The Keyboard What is an ergonomic keyboard? What are alternative forms for commands? • Designed to minimize strain on hands • Many programs allow you to use button, menu, and wrists or function key to obtain same result Ergonomics incorporates Command Button Menu Function Key(s) comfort, efficiency, and Copy Edit|Copy SHIFT+F2 safety into design of items Open File|Open CTRL+F12 in workplace Print File|Print CTRL+SHIFT+F12 Next Next p. 5.6 Fig. 5-8 p. 5.4 Fig. 5-4
Mouse Mouse mousemouse pad pad What is a mouse? mouse How does a mechanical mouse work? • Pointing device that • Rubber or metal mousemouse wheelwheel buttons button fits under palm of ball is on its buttons button hand underside • Controls movement of pointer, also • Movement of called mouse mouse translates pointer, on screen into signals • Pointer on screen computer takes several understands shapes
Next Next p. 5.7 p. 5.7 Fig. 5-9 ballball I-beam block arrow pointing hand
Mouse Other Pointing Devices How does an optical mouse work? What are common mouse operations? wheel backback wheel • Senses light to button buttonbutton button • Point detect mouse’s movement • Click forwardforward • More precise than buttonbutton • Right-click mechanical mouse • Double-click • Connect using a •Drag cable or wireless • Right-drag
opticaloptical • Rotate wheel sensorsensor • Press wheel Next Next p. 5.7 Fig. 5-10 p. 5.8 Fig. 5-11
2 Other Pointing Devices Other Pointing Devices What is a trackball? What is a touchpad? • Stationary pointing Small, flat, device with a ball on its top rectangular pointing device sensitive to • To move pointer, pressure and rotate ball with motion thumb, fingers, or palm of hand
touchpad Next Next p. 5.10 Fig. 5-13 trackball p. 5.10 Fig. 5-14
Other Pointing Devices Other Pointing Devices joystick What is a pointing stick? What are a joystick and a wheel? • Pointing • Joystick is vertical lever device mounted on a base shaped like • Wheel is steering-wheel pencil type input device eraser • Pedal simulates car wheel positioned brakes and accelerator between keys on keyboard pedal
Next pointing stick Next p. 5.11 Fig. 5-15 p. 5.11 Fig. 5-16
Other Pointing Devices Other Pointing Devices What is a light pen? What is a touch screen? • Handheld input device that contains light source or Touch areas can detect light of screen with finger Often used Press light pen against with kiosks screen surface and then press button on pen light pen touch screen Next Next p. 5.12 Fig. 5-17 p. 5.12 Fig. 5-18
3 Other Pointing Devices Other Pointing Devices What is a stylus? What is an electronic signature? Looks like a ballpoint • Pen and
pen, but uses stylus or pen graphics tablet pressure to write text used with special and draw lines software for Used with graphics handwriting tablets and handheld recognition computers • Legal as ink signature • Also called e-signature Next Next p. 5.13 Fig. 5-19 p. 5.13 Fig. 5-20
Other Pointing Devices Voice Input What is handwriting recognition software? How does voice recognition work? • Translates handwritten letters Step 1: Dictate and symbols into characters You’re right! that the computer can Step 2: Convert analog to digital understand
Step 3: Check database for match Natural Language your, you’re Engine Matches right, write …Your write …You’re right …Your right Step 4: Most likely match selected Next Next p. 5.14 Fig. 5-21 p. 5.15 Fig. 5-22
Input Devices for Voice Input Handheld Computers What is a MIDI? How is a data entered into a handheld device? • External device, such as electronic piano stylus keyboard, to input music and sound effects
handwriting recognition characters voice input stylus
stylus
transfer data from on-screen desktop Next keyboard computer Next p. 5.16 Fig. 5-23 digital camera p. 5.17 Fig. 5-25 portable keyboard
4 Digital Cameras Digital Cameras How does a digital camera work? What is a digital camera? 1: Take picture Step 1 • Allows you to take digital pictures 2: Image focuses on CCD
• Images viewable immediately on camera 3: CCD generates analog Step 2 signal that represents Download image 4: Analog signal to computer Step 3 converts to digital signal Post pictures Step 4 5: Digital signal processor to Web (DSP) adjusts quality Step 5 6: Transfer image to computer 7: View and manipulate image Next Next Step 6 p. 5.18 Fig. 5-26 p. 5.19 Fig. 5-27 Step 7
Digital Cameras Video Input What is resolution? What is video input? • Sharpness and clarity of image • Process of entering full-motion recording into computer • Higher the resolution, the better the image quality, but the • Also called video capture digitaldigital video video more expensive the camera cameracamera Video capture card is •Pixel (picture element) is single point in electronic image expansion card that Greater the converts analog video number of pixels, signal into digital the better the signal image quality that computer understands Video compression
Next Next analoganalog video video p. 5.20 Fig. 5-28 p. 5.21 Fig. 5-30 cameracamera
Video Input Video Input What is a PC video camera? What is a Web cam? • Digital video camera that allows home user to record, edit, • Video camera whose output displays on a Web page and capture video and still images, and to make video • Also called a cam telephone calls on Internet PC video • Also called PC camera camera Streaming cam shows moving images by sending continual stream of pictures
Web cam Next Next video output p. 5.22 Fig. 5-29 p. 5.23 Fig. 5-31
5 Scanners and Reading Video Input Devices What is videoconferencing? What is a scanner? • Two or more geographically separated people who use • Device that captures data directly from source network on the Internet to transmit audio and video data document – Source document is original form of data Whiteboard is another window on screen that can display notes and drawings OCR simultaneously on all participants’ screens
Next Next p. 5.24 Fig. 5-32 p. 5.24 flatbed scanner
Scanners and Reading Scanners and Reading Devices Devices How does a flatbed scanner work? What are various types of scanners? 1: Place document Pen or face down handheld 2: Bright light scans document 3: Image reflected Step 1 into mirrors Flatbed 4: Light converted to Step 2 analog electrical and Step 3 then to digital signal 5: Digital information sent to computer 6: Print or save document Drum Next Next p. 5.25 Fig. 5-33 Step 4 Step 6 p. 5.26 Fig. 5-34 Step 5 Sheet-fed
Scanners and Reading Scanners and Reading Devices Devices What is image processing? What is an optical reader? • Capturing, storing, analyzing, displaying, printing, • Device that uses light source to read characters, and manipulating images marks, and codes and then converts them into • Converting paper documents digital data into electronic form • Also called imaging Optical Optical mark character recognition Bar recognition (OMR) code Next Next scanner p. 5.26 p. 5.27 (OCR)
6 Scanners and Reading Scanners and Reading Devices Devices What is an OCR font? What is a turnaround document? • You return it to company that sent it
• OCR font, such as OCR-A, used with OCR devices • OCR device determines characters’ shapes by detecting patterns of light and dark numbers are read • OCR software converts shapes into characters by OCR device when document is the computer can understand returned Next Next p. 5.27 Fig. 5-35 p. 5.27 Fig. 5-36
Scanners and Reading Scanners and Reading Devices Devices What is optical mark recognition (OMR)? What is a bar code scanner? • Uses laser beams to read • Reads hand- bar codes drawn pencil marks, such as small circles or rectangles
bar code scanners Next Next p. 5.28 Fig. 5-37 p. 5.28 Fig. 5-38
Scanners and Reading Scanners and Reading Devices Devices What is a bar code? What is a magnetic ink character recognition • Identification code that consists of a set of vertical reader (MICR)? lines and spaces of different widths • Can read text printed with magnetized ink • Universal Product Code (UPC) • Banking industry almost exclusively uses MICR for check processing
NumberNumber system system charactercharacter identifies identifies typetype of of product product
Check character verifies ManufacturerManufacturer Check character verifies accuracy of scanned identificationidentification number number accuracy of scanned UPC symbol (Kellogg’s,(Kellogg’s, in in this this case) case) UPC symbol Next Next Item number (10 oz. box p. 5.28 Fig. 5-39 Item number (10 oz. box p. 5.30 Fig. 5-41 check bank account check of Froot Loops of Froot Loops number number number amount
7 Scanners and Reading Input Devices for Devices Physically Challenged Users pointing What is wireless input? device for • Handheld computer or device used to collect data What input devices are those with wirelessly at the location where transaction or available for those with motor event takes place physical limitations? disabilities • Data transferred later to desktop computer through keyguard for limited docking station hand mobility
onscreen keyboard
Next Next p. 5.30 Fig. 5-42 p. 5.31 speech recognition
Input Devices for PUTTING IT ALL Physically Challenged TOGETHER Users What type of input devices do home users require? What are new developments in computing that will Enhanced keyboard or ergonomic Home benefit physically challenged users? keyboard Mouse Gesture Implantation Joystick or wheel recognition • For paralyzed or speech- 30-bit 600x1,200 dpi color scanner impaired individuals • Computer will detect human 1- to 4-megapixel digital camera motions • Doctor will implant computerized device Microphone • Computers with this containing transmitter into capability have potential to brain Voice recognition software recognize sign language, read lips, track facial • As user thinks, transmitter Next will send signals to Next PC video camera p. 5.32 movements, or follow eye p. 5.33 Fig. 5-46 gazes computer
PUTTING IT ALL PUTTING IT ALL TOGETHER TOGETHER What type of input devices do SOHO users require? What type of input devices do mobile users require? Mobile Enhanced or ergonomic keyboard Small Office/Home Office Wireless mouse for notebook computer Mouse Trackball, touchpad, or pointing Stylus and portable keyboard for stick on notebook computer handheld computer Stylus and portable keyboard for 36-bit 600 x 1,200 dpi color scanner handheld computer 1- to 4-megapixel digital camera 2- or 3-megapixel digital camera Microphone Voice recognition software Voice recognition software
Next Next p. 5.33 Fig. 5-46 PC video camera p. 5.33 Fig. 5-46
8 PUTTING IT ALL PUTTING IT ALL TOGETHER TOGETHER What type of input devices do power users require? What type of input devices do large business users require? Power Enhanced or ergonomic keyboard Enhanced or ergonomic keyboard Large Business Mouse Mouse Touch screen Stylus and cursor for graphics tablet Light pen for point-of-sale terminals 48-bit 1,200x1,200 dpi color scanner 42-bit 1,200x1,200 dpi color scanner 3-megapixel digital camera OCR, OMR, bar code reader, or MICR reader Microphone Video camera for videoconferences PC video camera Voice recognition software Microphone Next Next p. 5.33 Fig. 5-46 p. 5.33 Fig. 5-46
Summary of Input
• What is input? • What are input devices? • The keyboard • Mouse • Other pointing devices • Voice input • Input devices for handheld computers •Digital cameras • Video input • Scanners and reading devices • Input devices for physically challenged users Chapter 5 Complete
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