Ict 4
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- 2. 2 Portable computers and mobile devices often use: Built in or slide-out keyboard Pen or touch input (on-screen keyboard) Voice input
- 3. 3 Pointing devices: Used to select and manipulate objects Used to input data Used to issue commands to the computer Common types of pointing devices: Mouse, touchpad, touchpoint, rollerball, joystick Pen/stylus Touch screen
- 4. 4 Mouse: A common pointing device that the user slides along a flat surface to move a pointer around the screen and clicks its buttons to make selections Older mechanical mice use a ball Optical or laser mice track with light Can be wireless
- 5. 5 Stylus: Pen-like device used to draw or write electronically on the screen Also called digital pen, electronic pen, tablet pen Commonly used with pen-based computers Used to issue commands and input data If handwriting recognition is used, written text can be converted to editable typed text
- 6. 6 • Digital form: Used to input handwritten data into the computer and then convert it to editable text
- 7. 7 Other uses for pens/styluses: Digital writing systems Graphics tablets Signature capture devices
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- 9. 9 Other pointing devices: Joysticks, gamepads, and other gaming devices Trackballs Buttons and wheels Touch pads
- 10. 10 Scanner (optical scanner): Input device that captures an image of an object and transfers them to a computer in digital form Can scan photos, documents, drawings, (flat objects) Data is typically input as a single image If optical character recognition (OCR) is used, text is input as individual text characters Types of scanners Flatbed Portable 3D Integrated (ATMs, etc.)
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- 12. 12 Optical resolution: Quality of scanned images Measured in number of dots per inch (dpi) Can often be specified when image is scanned Can be changed when scanned image is edited Varies with scanner used Higher resolution = better quality but larger file size
- 13. 13 Barcode readers: Input devices that read barcodes Barcode: Machine-readable code that represents data as a set of bars
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- 15. 15 Radio frequency identification (RFID): Technology used to store and transmit data located in RFID tags RFID tag: Contains tiny chips and radio antennas Attached to objects for identification purposes Read by RFID readers Tags only need to be within range of the reader, rather than in the line of sight Applications Tracking inventory and assets Electronic tolls Tracking patients in hospitals Ticketing applications Security: Speeding up ID process
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- 17. 17 Optical mark readers (OMRs): Input data from special forms to score or tally exams, questionnaires, ballots Optical character recognition (OCR): The ability of a computer to recognize scanned text characters and convert them to electronic form as text, not images OCR readers can recognize many typed fonts Used to process turnaround documents like monthly bills
- 18. 18 Magnetic ink character recognition (MICR) readers: Read MICR characters Used primarily for banking MICR readers read the special magnetic characters and sort/process checks Can be used for remote deposit
- 19. 19 Biometric data: Based on unique physiological characteristics or personal trait Fingerprint Hand or face geometry Iris of the eye Voice or signature Biometric readers: Used to input biometric data Can be stand-alone or built into another piece of hardware Used to allow access only by authorized individuals Most often used for access control and to verify transactions
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- 22. 22 Digital video cameras Digital camcorders PC video cameras (PC cams, Web cam) Store images on digital media (flash memory, DVDs, hard drives, etc.) Applications: Surveillance video cameras Video conferences and Webinars Face recognition systems
- 23. 23 Audio input: The process of entering audio data into the computer Voice input: Inputting spoken words and converting them to digital form Via microphone or headset Recorded for narrations, podcasts, etc. VoIP (Voice over IP systems) applications To provide spoken instructions to computer (speech recognition systems) Music input systems are used to input music Microphones, keyboard controllers, etc.
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- 26. 26 Color vs. monochrome CRT vs. flat-panel displays Size and aspect ratio Screen resolution Video adapters, interfaces, and ports Wired vs. wireless displays 2D vs. 3D Touch and gesture capabilities
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- 28. 28 Liquid crystal displays (LCDs): Use charged liquid crystals between sheets of glass or plastic Requires backlighting LED (Light emitting diode): Used in displays as well as a variety of consumer products OLED (Organic Light emitting diode) – Uses layers of organic material Emit visible light when current is applied FOLED (Flexible OLED) TOLED (Transparent OLED) PHOLED (Phosphorescent OLED)
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- 30. 30 Interferometric modulator displays (IMOD): Essentially a complex mirror that uses external light to display images Designed initially for mobile phones and portable devices Images are bright and clear, even in sunlight Plasma displays: Use layers of gas to display images Most often used on large displays Surface-conduction electron-emitter displays (SED): Millions of tiny electron guns, similar to CRT Thin, bright, less flicker than LCD or plasma
- 31. 31 Data projector: Display device that projects all computer output to a wall or projection screen Found in classrooms, conference rooms Can be wireless or integrated into devices Integrated – tiny projectors built into mobile phones, portable devices Hologram projectors used to display 3D images
- 32. 32 Printers: Produce hard copy Printer characteristics Printing technology used Impact vs. nonimpact Color vs. black and white Personal vs. network printers Print resolution (measured in dpi) Print speed (measured in pages per minute (PPM)) Connection (USB, Ethernet, Wi-Fi, etc.) Multifunction capabilities
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- 34. 34 Ink-jet printer: Sprays droplets of ink to produce images on paper Usually print in color Often the choice for home use Print fairly slowly, one line at a time Quality not quite as good as a laser printer Use ink-jet cartridges Newer printers with full width printheads are much faster Potential applications for the future Dispensing liquid metal, aromas, computer chips and other circuitry, “printing” human tissue
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- 36. 36 Photo printers Barcode, label, and postage printers Portable printers Plotters and wide-format ink-jet printers 3-D printers
- 37. 37 Audio output: Output in the form of voice, music, and other audible sounds Speakers Headphones and headsets Earphones and earbuds