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Chapter 5 Input. Chapter 5 Objectives. Explain how a digital camera works. Define input. Describe uses of PC video cameras, Web cams, and video conferencing. List characteristics of a keyboard. Describe different mouse types and how they work.

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Chapter 5 input l.jpg

Chapter 5Input


Chapter 5 objectives l.jpg
Chapter 5 Objectives

Explain how a digital camera works

Define input

Describe uses of PC video cameras,Web cams, and video conferencing

List characteristics of a keyboard

Describe different mouse typesand how they work

Discuss various scanners and reading devices and how they work

Summarize how pointing devices work

Explain the types of terminals and the purpose of their card readers

Explain how voice recognition works

Summarize the various biometric devices

Describe various input devicesfor mobile users

Identify alternative input devices for physically challenged users


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WHAT IS INPUT?

  • Any data or instructions you enter into the memory of a computer

    • Data - unorganized facts, figures, symbols

    • Instructions

      • Programs

      • Commands

      • User Responses


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THE KEYBOARD

  • Most commonly used input device

  • Many features

  • Many types

    • Cordless

    • Built-in

    • Ergonomic

    • Portable

    • Virtual


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THE KEYBOARD

  • What are alternative forms for commands?

    • Many programs allow you to use key combination, menu, or button to obtain same result


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POINTING DEVICES

An input device that allows you to control a pointer on the screen

  • Mechanical Mouse

  • Optical Mouse

  • Trackball

  • Touchpad


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POINTING DEVICES

  • Pointing stick

  • Joystick

  • Touch screen


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POINTING DEVICES

  • Pen Input

    • Light pen

    • Stylus

    • Cursor

    • Electronic signature

    • Handwriting recognition software


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AUDIO INPUT

  • Voice Input: Speech Recognition

    • Computer’s capability of distinguishing spoken words

    • Speaker dependent (user must train the computer) vs speaker independent

    • Discrete vs continuous speech


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AUDIO INPUT

  • Audio Input

    • Entering music, speech, or sound effects

    • Requires a sound card

    • Uses microphone, tape/CD player, …

    • MIDI


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VIDEO INPUT

  • Video Input

    • Entering a full-motion recording into a computer and storing the video on a hard disk or some other medium

    • Digital video (DV) camera records video as digital signals

    • PC video camera

    • Web cam


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VIDEO INPUT

  • Videoconferencing

    • Meeting between two or more geographically separated individuals who use a network to transmit audio and video data

      • Whiteboard can display notes and drawing simultaneously on all participants’ screens.


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DIGITAL CAMERAS

  • Allows you to take pictures and store the photographed images digitally

    • Edit, print, fax, mail, or post on the Web

    • Images stored various ways:

      • Floppy disk

      • PC card

      • Memory stick

      • Compact flash disk

    • The higher the resolution the better the image

      • More pixels means higher resolution


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SCANNERS AND READING DEVICES

  • Make the input process more efficient by eliminating the manual entry of data

  • Source document: original paper document

  • Scanners are used for image processing, converting paper documents into electronic images


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SCANNERS AND READING DEVICES

  • Optical Scanner

  • Convert an image into a numeric representation: the bitmap

  • Types of scanners

    • Handheld

    • Flatbed

    • Drum

    • Sheet-feed


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SCANNERS AND READING DEVICES

  • Optical Readers

    • Uses light to read characters, marks, and codes

    • Converts them into digital data that can be processed by a computer


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SCANNERS AND READING DEVICES

  • Optical Readers

  • Optical character recognition (OCR)

    • Reads printed characters

    • OCR software used with scanners

  • Optical mark recognition (OMR)

    • Reads hand-drawn marks

  • Bar code scanner


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SCANNERS AND READING DEVICES

  • Magnetic Ink Character Recognition (MICR) Reader

    • Preprinted on checks - bank code, account number, and check number


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SCANNERS AND READING DEVICES

  • Data collection devices

    • Used to obtain data directly at the location where the transaction or event takes place


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TERMINALS

  • Performs both input and output

  • Components: monitor, keyboard, video card

  • Special purpose terminals:

    • Point-of-sale (POS) terminal

      • Card reader reads customer’s data from magnetic strip

    • Automatic teller machine (ATM)

      • Connects to host computer through network


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TERMINALS

  • Smart display

    • Thin monitor that detaches from computer to function as portable wireless touch screen


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BIOMETRIC INPUT

  • Biometrics authenticates a person’s identity by verifying personal characteristics.

    • Fingerprint scanners

    • Face recognition system

    • Voice verification system

    • Signature verification system

    • Iris recognition system


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INPUT DEVICES FOR THE PHYSICALLY CHALLENGED

  • Americans with Disabilities Act (ADA) requires company to make reasonable attempts to accommodate the needs of physically challenged workers.



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