Chapter 5, Input
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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.