Understanding Computers: Today and Tomorrow, 15th Edition Chapter 4 PDF

15th Edition Understanding Computers Today and Tomorrow Comprehensive Chapter 4 Input and Output PART-1 Deborah Morle...

15th Edition Understanding Computers Today and Tomorrow Comprehensive Chapter 4 Input and Output PART-1 Deborah Morley Charles S. Parker Copyright 2015 Cengage Learning  Learning Objectives 1. Explain the purpose of a computer keyboard and the types of keyboards widely used today. 2. List several different pointing devices and describe their functions. 3. Describe the purposes of scanners and readers and list some types of scanners and readers in use today. 4. Explain what digital cameras are and how they are used today. 5. Understand the devices that can be used for audio input. Understanding Computers: Today and Tomorrow, 15th Edition 2  Learning Objectives 6. Describe the characteristics of a display device and explain some of the technologies used to display images. 7. List several types of printers and explain their functions. 8. Identify the hardware devices typically used for audio output. Understanding Computers: Today and Tomorrow, 15th Edition 3  Overview This chapter covers: – The most common input devices – Hardware designed for capturing data in electronic form – Audio input – Types of display devices and how they work – Types of printers and how they work – Audio output devices Understanding Computers: Today and Tomorrow, * 15th Edition  Keyboards An input device used to enter characters at the location marked by the insertion point or cursor – Can be wired or wireless – Typically contains: Standard alphanumeric keys Numeric keypad Function keys Delete and Backspace keys Control and Alternate keys Arrow directional keys and special keys Understanding Computers: Today and Tomorrow, 15th Edition 5  Keyboards Understanding Computers: Today and Tomorrow, 15th Edition 6  Keyboards Mobile devices often use: – Slide-out keyboard – Pen or touch input (on-screen keyboard) – Keyboard dock Understanding Computers: Today and Tomorrow, 15th Edition 7  Pointing and Touch Devices Pointing devices are used to: – Select and manipulate objects – Input data – Issue commands to the computer Common types of pointing devices: – Mouse – Pen/stylus – Devices that use touch input Understanding Computers: Today and Tomorrow, 15th Edition 8  Mice Mouse – 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 – Touch mice support two- dimensional gestures 9  Mice Understanding Computers: Today and Tomorrow, 15th Edition 10  Trend Box Perceptual Computing – Users control devices with 3D gestures, voice commands, and facial expressions – Noncontact system – Allows for full body input and input from a slight distance away Understanding Computers: Today and Tomorrow, 15th Edition 11  Pens/Styluses Stylus – Pen-like device used to draw or write electronically on the screen – Also called digital pen, electronic pen, tablet pen – Pen input is being used for: Photography, graphic design, animation Industrial design, document processing, and healthcare applications Navigating through a document Issuing commands 12  Pens/Styluses – Pen-Based Computers and Mobile Devices Pen input used with mobile devices and tablet computers – Used to input handwritten text and sketches and to manipulate objects – If handwriting recognition is used, written text can be converted to editable typed text 13  Pens/Styluses Digital Writing Systems – Pen-based systems that capture handwritten input as it is being written – Requires special paper with a grid of dots – Handwritten input can be transferred to computer Graphics Tablets – Pen tablets or digitizing devices – Flat, touch sensitive tablet typically connected to computer using a USB 14 port  Pens/Styluses Signature Capture Devices – Found at check out counters to record customer signatures Understanding Computers: Today and Tomorrow, 15th Edition 15  Touch Screens Touch Screens – Display devices that are touched with the finger to select commands or otherwise provide input to the computer – Common on portable computers, smartphones, and other mobile devices – Multi-touch Can recognize input from more than one finger at a time – Table PC Large screen computer either built into a table or designed to be used 16 on a table  Touch Screens Understanding Computers: Today and Tomorrow, 15th Edition 17  Other Pointing Devices Gaming devices Trackballs Control buttons and wheels Touch pads Understanding Computers: Today and Tomorrow, 15th Edition 18  Quick Quiz 1.An optical mouse is. a. the same as a wireless mouse b. a mouse that tracks movements with light instead of a ball c.a mouse that contains a scroll wheel on the top 2. True or False: With handwriting recognition, text is input as a graphical image so the text cannot later be edited as text. 3. An input device that looks like an upside-down mouse with the ball on top is a(n). 19  How It WorksBox Augmented Reality – Computer generated images are overlaid on top of real- time images – Today, most often with smartphones using camera input, location info, and other data – Displays appropriate information related to images captured by the smartphone 20  Scanners, Readers, and Digital Cameras Source documents – Already exists in physical form (photographs, checks, or product label) Source data automation – Captures data directly from a source document Saves time Increases accuracy Utilizes scanning or reading devices 21  Scanners Scanners (Optical Scanners) – Input devices that read printed text and graphics and transfers them to a computer in digital form – Data is typically input as a single image – Can scan photos, documents, images – Types of scanners Flatbed Portable 3D Receipt and business 22 card scanners  Scanners Understanding Computers: Today and Tomorrow, 15th Edition 23  Scanners Scanning Quality and Resolution – Quality of scanned images indicated by optical resolution Measured in number of dots per inch (dpi) Can often be specified when image is scanned Can be changed when scanned image is edited – Higher resolution means better quality but larger file size 24  Readers Barcode Readers – Input devices that read barcodes Barcodes – Machine-readable codes that represent data as a set of bars – Common Types Universal Product Code (UPC) ISBN DataBar QR Codes 25  Readers Understanding Computers: Today and Tomorrow, 15th Edition 26  Readers Understanding Computers: Today and Tomorrow, 15th Edition 27  Readers Radio Frequency Identification (RFID) Readers – Technology used to store and transmit data located in RFID tags – RFID tags contain tiny chips and radio antennas Can be attached to objects Read by RFID readers Tags only need to be within range of the reader, rather than in the line of sight Understanding Computers: Today and Tomorrow, 15th Edition 28  Readers Applications – Tracking inventory and assets – Electronic toll collection – Tracking patients in hospitals – Ticketing applications – Speeding up ID process of travelers at border crossings Types of RFID Readers – Handheld, portal, and stationary Slow to catch on in retail industry due to privacy and security issues 29 Readers 30  Readers Optical Mark Readers (OMRs) – Input data from special forms to score or tally exams, questionnaires, ballots Optical Character Recognition (OCR) Devices – OCR is the ability of a computer to recognize scanned text characters and convert them to electronic form as text, not images – OCR software is used to identify each character and convert it to editable text – Used to process turnaround 31 documents like monthly  Readers Magnetic Ink Character Recognition (MICR) Readers – Also called check scanners – Used primarily for banking – Read the special magnetic characters printed at the bottom of checks – High volume readers process deposited checks – Used to facilitate remote deposits and electronic check processing Understanding Computers: Today and Tomorrow, 15th Edition 32  Readers Biometric Readers – Used to input biometric data such as anindividual’s fingerprint or voice – Can be stand-alone or built into another piece of hardware – Most often used for access control, to authorize electronic payments, log on to secure Web sites Understanding Computers: Today and Tomorrow, 15th Edition 33  Technology and You Box Mobile Deposits – Mobile remote deposit capture – Transmit check information via smartphone app and camera – App optimizes the check front and back images and transmits images and deposit data to your bank Understanding Computers: Today and Tomorrow, 15th Edition 34 Thank you for listening and have a great day :) - VDS