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IT 10103 Introduction to Information Technology CHAPTER 05 - INPUT.

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Presentation on theme: "IT 10103 Introduction to Information Technology CHAPTER 05 - INPUT."— Presentation transcript:

1 IT 10103 Introduction to Information Technology CHAPTER 05 - INPUT

2 Input What is Input? Any data or instruction entered into the memory of a computer.

3 Input There are 4 types of input: TextGraphicsAudioVideo

4 Input Data Single Fact about something

5 Input Instructions Programs are made up of instructions that are processed in memory to convert data into information

6 Input Command User issued request for the computer to perform some action

7 Input User Response Replying to a question asked by the program instructions

8 Input Input Devices Any hardware component that allows users to enter data or instructions into a computer.

9 Keyboards The primary input device for the personal computer

10 Keyboards QWERTY DVORAK

11 Keyboards Types of Keyboards The Kinesis Keyboard 104 Key Keyboard 102 Key Multimedia Keyboard

12 Pointing Devices Controls a pointer on-screen

13 Pointing Devices Mouse Primary pointing device on personal computers

14 Mouse Mouse was originally invented at Xerox’s Palo Alto Research Center (PARC) in the late 70’s

15 Mice where first introduced to the public with the introduction of the Apple Macintosh in 1984 Mouse

16 Primary pointing device – it moves a cursor on screen corresponding to the movement of the mouse by the user Mouse

17 Types of mice: Roller Ball Track Ball OpticalLaser Light Pen Graphic Stylus Mouse

18 Roller Ball:

19 Track Ball:

20 Optical: (LED)

21 Laser (Logitech G5)

22 Light Pen

23 Graphic Stylus

24 Mouse Interfaces: PS/2USBSerial Mouse

25 PS/2

26 USB

27 Serial

28 Entering data by speaking into a microphone attached to the computer Called Voice Recognition See Page 245 – Figure 5-18 Voice Input

29 Entering sound into the computer Music and Sound Effects MIDI (Musical Instrument Digital Interface) Audio Input

30 Digital Camera Allows users to take pictures and store the photographed images digitally.

31 When you take a picture, light passes into the camera lens, which focuses the image on a charge-coupled device (CCD). The CCD generates an analog signal that represents the image. Digital Camera

32 An analog-to-digital converter (ADC) converts the analog signal to a digital signal. A digital signal processor (DSP) stores the digital image on the camera’s storage media. Digital Camera

33 The images can be transferred to a computer via a USB/Serial/Firewire connection Digital Camera

34 Factors to Consider: Resolution & Pixel Quantity Digital Camera

35 Resolution: Describes the sharpness and clearness of an image Stated in Pixels per Inch 1600 x 1200 1600 pixels per horizontal inch 1200 pixels per vertical inch Digital Camera

36 Bit Depth: 24 bits per pixel is minimum for a good quality digital camera Or each pixel requiring 24 bits to represent the color of the pixel or 3 Bytes per color Digital Camera

37 Video: Digital Video camera’s work the same way, but record moving images requiring larger capacity storage. Digital Camera

38 Scanners Optical Device similar to a copier

39 Designed to make copies of images & text for use with a computer measured in dpi or dots per inch The higher the dpi the shaper and clearer the image, but also the greater the storage needs to hold all the data Scanners

40 Images Converts Analog signal copy to a Digital signal copy that a computer can use Scanners

41 Text Converts the text into digital format via OCR (Optical Character Recognition) software Scanners

42 OCR Recognizing the text on a document to be able to convert it to editable text a word processing or other software can use Scanners

43 Scanner dpi vs Printer dpi Scanner or image dpi refers to how much information is in the image in a given area; printer dpi gives you an idea of how the ink goes onto the paper Scanners

44 There is rarely a need to scan higher than 240 dpi except for OCR Pictures in magazines are scanned at 200 dpi Scanners For: Scan At: E-Mail 72 dpi Web Pages 72-100 dpi Printers 72-240 dpi OCR 300 dpi

45 Storage Concerns Scanning a 4x6 photo produces: 240 DPI = 4.032Mb 360 DPI = 9.074Mb 720 DPI = 36.295Mb Scanners

46 The technology of authenticating a person’s identity by verifying a personal characteristic Used to grant access to programs, systems, rooms, or buildings. BioMetrics

47 Fingerprint Scanner Used to authenticate utilizing the distinctive fingerprint pattern of an individual BioMetrics

48 Hand Geometry Scanner Used to authenticate utilizing the distinctive geometric hand pattern of an individual BioMetrics

49 Face Recognition Scanner Used to authenticate utilizing a comparison of the individuals prerecorded face image with the image being scanned BioMetrics

50 Voice Verification Scanner Used to authenticate utilizing a comparison of the individuals prerecorded voice pattern with the voice pattern being scanned BioMetrics

51 Signature Verification Scanner Used to authenticate utilizing a comparison of the individuals prerecorded signature with the signature being scanned BioMetrics

52 Iris Recognition Scanner Used to authenticate utilizing a scan of the iris which is unique for each individual BioMetrics

53 All input devices regardless of type allow us to enter some form of data into the computer for use with software or for storage Input Summary

54 Questions?

55 Answer these questions: How would Biometrics benefit students? What might be the advantages and disadvantages of Biometrics for students? What might be the advantages and disadvantages of Biometrics for students? With the benefits and disadvantages in mind, would you be better off with or without Biometrics for students? Why? With the benefits and disadvantages in mind, would you be better off with or without Biometrics for students? Why? Discuss RFID technology? What role you think it will play in our future? What role you think it will play in our future? What do you see as good or bad about RFID? What do you see as good or bad about RFID? Assignment 03


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