Input devices
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Input devices allow data and instructions to enter a computer system. Common input devices include keyboards, pointing devices like mice, and scanning devices. Keyboards allow text entry and come in various styles. Mice, touchscreens, and other pointing devices control the computer's cursor. Scanners digitize physical documents and images using light sensors. Character and mark recognition devices digitally read special text formats.
Input devices
- 1. Presented by Imtiaz Ahmed Rabbia Jilani
- 2. Define input Describe keyboard entry, pointing devices, & scanning devices Discuss image capturing devices, digitizing devices, & audio input devices
- 3. Define output Describe monitors, printers, and audio output devices Discuss combination input & output devices
- 4. Any data or instructions used by a computer Input devices Hardware Keyboards Mice Scanners Other devices Translates data into a form that the system unit can process
- 5. Keyboards Traditional keyboards Flexible keyboards Ergonomic keyboards Wireless keyboards PDA keyboards Features Typewriter keyboard with numeric pad Special purpose keys Toggle and combination keys
- 7. Mouse Mechanical Optical Cordless or wireless Joystick Touch Screen Light Pen
- 8. Optical scanners Flatbed Portable Bar code readers Handheld wand readers or platform scanners Contain photoelectric cells that read bar codes
- 9. Character and mark recognition devices Scanners that recognize special characters & marks Magnetic ink character recognition (MICR) Optical-character recognition (OCR) Optical-mark recognition (OMR)
- 10. Digital camera Images recorded digitally on a disk Images can be downloaded to a computer Digital video camera Records motion digitally Can take still images as well WebCams Specialized digital video cameras Broadcast images over the Internet
- 11. Graphics Tablets Digital Notepads
- 12. Scanner Light sensing equipment to translate images of text, drawing, photo into digital form
- 13. Types of Scanner Scanners capture and digitize printed images. There are several types of scanners Flatbed scanners Handheld scanners Sheet-fed scanners Drum scanners
- 14. Flatbed scanner If we talk about scanners, thus we mean usually flatbed scanner. The scan documents (texts, photo, diagrams etc..) are put on a glass plate like a copier, under which a carriage with an exposure item and the read head moves. Then the picture is scanned
- 15. Handheld scanner • Any standalone image scanner that either glides from left to right or top to bottom (depending on the scanner model). • It allows the user to scan the contents of any books, letters, recipes, bank statements, receipts
- 16. Sheet-fed Item to be scanned is to be pulled into a stationary scanning mechanism Smaller and less expensive than flatbed scanner
- 17. DRUM SCANNER Item to be scanned rotates around stationary scanning mechanism Very large and expensive Used in the publishing industry.
- 18. Scanner Devices Optical scanner Bar code readers Character and Mark recognition
- 19. Optical Scanners Convert text or drawings into machine readable format Can be displayed, printed, or stored
- 20. Bar Code Readers Photoelectric (optical) scanners that translate the symbols in the bar code into digital code Read bar codes Alternating black & white vertical bars Universal Product Code (UPC) Seen in grocery stores, retail stores
- 21. Character & Mark Recognition Magnetic-ink character recognition (MICR) Optical character recognition (OCR) Optical-mark recognition (OMR)
- 22. Magnetic-ink character recognition (MICR) Reads magnetically encoded characters
- 23. Optical character recognition (OCR) Software convert scanned text from images (pictures of the text ) to an Editable text format (usually ASCII) that can be imported into a word processing application and manipulated
- 24. Optical character recognition (OCR) Example Scan or picture capture of the document: a scanner or a camera capture the paper document. The OCR engine extract the text from the image The text recognized is send to be processed
Editor's Notes
- #5: Input devices are hardware used to translate words, sounds, images, and actions that people understand into a form that the computer can understand Input allows user to put their information into computer language Most common are keyboard, mouse, “light” pens, and increasingly voice!
- #6: Keyboards come in a variety of designs Range from full-sized to miniature and from rigid to flexible Common types Traditional Flexible – fold or roll up fore easy packing or storage Ergonomic keyboards – similar to traditional Keyboard arrangement is not rectangular and a palm rest is provided Wireless PDA - miniature keyboards
- #7: Features Numeric key pad – used to enter numbers and arithmetic symbols Toggle keys Cap Locks Combination keys – perform an action when used with other keys CTRL key
- #8: Direct entry creates machine-readable data that can go directly to the CPU. Pointing devices mouse, joystick, touch screen, light pen and stylus Mouse Mechanical – traditional type Optical – has no moving parts Emits and senses light to detect mouse movement Can be used on any surface Cordless – battery powered Uses radio waves or infrared light waves Joystick – input for computer games Touch Screen – a kind of monitor with a clear plastic outer layer Easy to use Commonly used at restaurants, ATMs, and information centers Light pen – a light sensitive pen-like device
- #9: Scanners move across text and images Devices convert scanned data into a form the system unit can process Types Optical – known as a scanner Recognizes light, dark, and colored areas that make up individual letters or images Types Flatbed Portable Bar Code Readers You see these devices at the grocery store Wand scanner or platform scanner Reads bar codes or vertical zebra striped marks printed on product containers Products have a UPC (Universal Product Code)
- #10: Character and mark recognition devices MICR - used by banks to read magnetically encoded characters OCR - specially preprinted characters are read by OCR devices such as wand scanners OMR - devices sense the presence or absence of marks, common for test scoring
- #11: These devices create or capture original images Digital camera – images downloaded to a computer Digital video camera – records motion digitally on a disk Can take still photos as well
- #12: Graphics tablets record sketches and tracings of maps and other drawings Used by artist, mapmakers, and engineers Digital notepads record handwritten notes and drawings Similar to table PCs except that they typically use regular notepads and pens Notepad is positioned on top of an electronic pad or tablet Notes can later be processed, edited, and used with a word processing program