Computers9 Ch5


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Computers9 Ch5

  1. 1. Chapter 5 B.M.H Input and Output
  2. 2. Learning Objectives <ul><li>Keyboard </li></ul><ul><li>Pointing Devices </li></ul><ul><ul><li>Mouse, Trackball, Touchpad, Pointing stick </li></ul></ul><ul><ul><li>Joystick, Graphics tablet, Touch screens </li></ul></ul><ul><ul><li>Pen-based computing </li></ul></ul><ul><li>Source Data Automation </li></ul><ul><ul><li>Magnetic-ink character recognition </li></ul></ul><ul><ul><li>Optical recognition devices </li></ul></ul><ul><ul><li>Voice output </li></ul></ul>MIU
  3. 3. Computer system MIU Input Processing Output Secondary Storage
  4. 4. Input <ul><li>Input data </li></ul><ul><ul><li>Go directly to the computer for processing </li></ul></ul><ul><ul><ul><li>Bar codes , </li></ul></ul></ul><ul><ul><ul><li>Speech through a microphone </li></ul></ul></ul><ul><ul><ul><li>Data by means of a device that converts motions to on-screen action </li></ul></ul></ul><ul><ul><li>Go through intermediate handling </li></ul></ul><ul><ul><ul><li>Copied from a source document and translated to a Magnetic disk </li></ul></ul></ul><ul><ul><ul><li>Called rawdata. </li></ul></ul></ul>MIU
  5. 5. Conventional input devices <ul><li>Keyboard </li></ul><ul><li>Pointing devices </li></ul>MIU
  6. 6. Keyboard <ul><li>Part of a PC or a terminal </li></ul><ul><ul><li>A traditional keyboard </li></ul></ul><ul><ul><li>A keyboard of supermarket or fast-food franchise </li></ul></ul><ul><ul><ul><li>Its keys represent items such as large fries or a Big Mac. </li></ul></ul></ul><ul><ul><li>A keyboard to enter other language characters such as a Chinese characters. </li></ul></ul>MIU
  7. 7. Pointing devices <ul><li>Used to position a pointer on the screen </li></ul><ul><ul><li>Pointer </li></ul></ul><ul><ul><ul><li>Has a number of shapes but most is often an arrow </li></ul></ul></ul><ul><li>Has one or more buttons </li></ul><ul><ul><li>To set the insertion point or cursor </li></ul></ul><ul><ul><li>To communicate commands to the OS or </li></ul></ul><ul><ul><li>an application program by clicking a button </li></ul></ul><ul><ul><ul><li>Often used to click on an icon in GUI </li></ul></ul></ul><ul><ul><li> Icon </li></ul></ul><ul><ul><ul><li>A pictorial symbol on a screen </li></ul></ul></ul><ul><ul><ul><li>Represents a computer activity (a command to the computer) </li></ul></ul></ul><ul><ul><li> GUI (graphical user interface) </li></ul></ul><ul><ul><ul><li>The environment that permits communication with the computer clicking on icons </li></ul></ul></ul>MIU
  8. 8. Pointing devices <ul><li>Types </li></ul><ul><ul><li>Mouse </li></ul></ul><ul><ul><li>Trackball </li></ul></ul><ul><ul><li>Touchpad </li></ul></ul><ul><ul><li>Pointing stick </li></ul></ul><ul><ul><li>Joystick </li></ul></ul><ul><ul><li>Graphics tablet </li></ul></ul><ul><ul><li>Touch screens </li></ul></ul><ul><ul><li>Pen-based computing </li></ul></ul>MIU
  9. 9. Mouse <ul><li>The most common pointing device for PCs </li></ul><ul><li>Types </li></ul><ul><ul><li>Mechanical mouse </li></ul></ul><ul><ul><ul><li>Uses a small ball on its underside </li></ul></ul></ul><ul><ul><ul><ul><li>Sensors inside the mouse determine the direction and distance of movement </li></ul></ul></ul></ul><ul><ul><li>Optical mouse </li></ul></ul><ul><ul><ul><li>Uses a light beam to monitor mouse movement </li></ul></ul></ul><ul><ul><li> Wireless mouse </li></ul></ul><ul><ul><ul><li>Communicate through an infrared beam without cable </li></ul></ul></ul><ul><ul><li> Wheel mouse </li></ul></ul><ul><ul><ul><li>Has an extra wheel that can be clicked like a button or rolled to affect the cursor </li></ul></ul></ul>MIU
  10. 10. MIU
  11. 11. MIU
  12. 12. Trackball <ul><li>A variation on the mechanical mouse </li></ul><ul><ul><li>Roll the ball directly with your hand </li></ul></ul><ul><ul><li>Used to play a video game </li></ul></ul>MIU
  13. 13. MIU
  14. 14. Touchpad <ul><li>A rectangular pressure-sensitive pad </li></ul><ul><ul><li>Slide a finger across the surface </li></ul></ul><ul><li>Buttons at the bottom of the unit </li></ul><ul><ul><li>The same functions as mouse buttons </li></ul></ul><ul><li>Recognize a finger tap as a click </li></ul>MIU
  15. 15. MIU
  16. 16. MIU
  17. 17. Pointing stick <ul><li>A small pressure-sensitive post </li></ul><ul><ul><li>mounted in the center of the keyboard between the G and H keys </li></ul></ul><ul><li>Pushing the post in one direction </li></ul><ul><ul><li>Causes it to move in that direction </li></ul></ul>MIU
  18. 18. MIU
  19. 19. Joystick <ul><li>A short lever with a handgrip </li></ul><ul><li>The distance and speed of movement </li></ul><ul><ul><li>Control the screen pointer ’ s position </li></ul></ul><ul><li>Most often used with games </li></ul><ul><ul><li>such as flight simulators </li></ul></ul>MIU
  20. 20. MIU
  21. 21. Graphics tablet <ul><li>Called a digitizing tablet </li></ul><ul><li>A rectangular board with an invisible grid of electronic dots </li></ul><ul><ul><li>used a pen-like stylus or a mouse-like puck </li></ul></ul>MIU
  22. 22. MIU
  23. 23. Touch screens <ul><li>One way of getting input directly from the source </li></ul><ul><li>Point to a selection </li></ul>MIU
  24. 24. MIU
  25. 25. Pen-based computing <ul><li>Use an electronic pen, or stylus to input data </li></ul><ul><ul><li>Used as a pointer on the screen </li></ul></ul><ul><ul><li>Used to input data in handwritten form </li></ul></ul>MIU
  26. 26. MIU
  27. 27. Source Data Automation <ul><li>The use of special equipment to collect data at the source (efficient data input) </li></ul><ul><ul><li>Send it directly to the computer </li></ul></ul><ul><ul><li>- supermarket bar code eliminates keying </li></ul></ul><ul><ul><li>Reduce the number of intermediate steps </li></ul></ul><ul><ul><li>-> Reduce costs and opportunities for human mistakes. </li></ul></ul><ul><li>The primary areas </li></ul><ul><ul><li>Magnetic-ink character recognition </li></ul></ul><ul><ul><li>Optical Scanners </li></ul></ul><ul><ul><li>Other optical recognition devices </li></ul></ul><ul><ul><li>Voice, finger or eye </li></ul></ul>MIU
  28. 28. MICR <ul><li>: M agnetic- I nk C haracter R ecognition </li></ul><ul><li>Involves using a machine to read character made of magnetized particles </li></ul><ul><li>Ex. Banking industry </li></ul><ul><ul><li>the numbers encoded across the bottom of personal check </li></ul></ul><ul><ul><li>These numbers should correspond to the amount of the check. </li></ul></ul>MIU
  29. 29. MIU
  30. 30. Optical Scanner <ul><li>Convert text or even a drawing or picture into computer-recognizable data </li></ul><ul><ul><li>by using a form of optical recognition </li></ul></ul><ul><li>Optical recognition system </li></ul><ul><ul><li>Use a light beam to scan input data and convert it into electrical signals </li></ul></ul><ul><li>Categories </li></ul><ul><ul><li>Flatbed scanner </li></ul></ul><ul><ul><li>Sheet-feed scanner </li></ul></ul><ul><ul><li>Handheld scanner </li></ul></ul>MIU
  31. 31. MIU Flatbed scanner Sheetfed scanner handheld scanner
  32. 32. More optical recognition methods <ul><li>O ptical M ark R ecognition (OMR) </li></ul><ul><li>O ptical C haracter R ecognition (OCR) </li></ul><ul><li>Bar codes </li></ul><ul><li>Handwritten characters </li></ul>MIU
  33. 33. OMR <ul><li>Called Mark sensing </li></ul><ul><ul><li>A machine senses marks on a piece of paper </li></ul></ul><ul><ul><li>Ex. Test ’ s answer sheet </li></ul></ul>MIU Exam 1. O O O O 2. O O O O 3. O O O O 4. O O O O 5. O O O O a b c d
  34. 34. OCR <ul><li>Use a light source to read special characters and convert them into electrical signals </li></ul><ul><li>OCR-A </li></ul><ul><ul><li>A standard typeface for optical character </li></ul></ul><ul><ul><li>Established by the ANSI </li></ul></ul><ul><ul><li>Can be read by both humans and machines </li></ul></ul>MIU
  35. 35. Bar code <ul><li>The code number represented on the product label by a pattern of vertical marks, or bars </li></ul><ul><li>Barcode reader </li></ul><ul><ul><li>sense and read these stripes </li></ul></ul><ul><ul><li>A photoelectric device that reads the code by mean of reflected light </li></ul></ul>MIU
  36. 36. MIU
  37. 37. MIU
  38. 38. Handwritten characters <ul><li>Machines that can read handwritten characters </li></ul><ul><ul><li>make handwritten data immediately usable for processing </li></ul></ul><ul><ul><li>Legibility of the handwriting are rigid </li></ul></ul>MIU
  39. 39. MIU
  40. 40. Voice input <ul><li>Speaking to a computer </li></ul><ul><li>Called speech recognition </li></ul><ul><li>Speech recognition devices </li></ul><ul><ul><li>Accept the spoken word through a microphone and convert it into binary code(0s and 1s) </li></ul></ul><ul><ul><li>The disabled,those with “ busy hands ” ,hands too dirty for the keyboard are using. </li></ul></ul>MIU
  41. 41. MIU
  42. 42. Digital Cameras <ul><li>Takes photos that it stores internally on a chip </li></ul><ul><ul><li>No film </li></ul></ul><ul><ul><li>Photos sent by cable directly to a computer </li></ul></ul>MIU
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