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Data Capture

Data Capture. Questions!. What is data? What is information? What is knowledge?. What is data capture?. The process of inputting data from it’s source to the computer system Makes use of a computer input device Note that not all input devices are suitable for data capture!.

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Data Capture

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  1. Data Capture

  2. Questions! What is data? What is information? What is knowledge?

  3. What is data capture? • The process of inputting data from it’s source to the computer system • Makes use of a computer input device • Note that not all input devices are suitable for data capture!

  4. Keyboard data entry • Most common method of input device • Suitable for most applications (although not always the best method) • It is easy to make transcription errors – that is, copy the data wrongly from the document • It is time-consuming • Data entry operators who enter data all day every day are prone to repetitive strain injury (RSI)

  5. Voice data entry • The user speaks the text into a microphone • Special software interprets the text exports it to a word processing package • The accuracy of the voice recognition system is improved by ‘training’ it to a particular user’s voice - still not 100% accurate esp with technical / legal words • Needs a powerful machine!

  6. Scanners / OCR • Scanners can be used to read typed documents • OCR (Optical Character Recognition) software can then be used to interpret the text and export it to a word processor or data file for editing • Very powerful OCR software can also convert neat handwriting • Scanners are also used to input large volumes of data on pre-printed forms such as credit card payments where data is in a specific place

  7. Key to Disk (1) • Large amounts of data is collected on forms • Many operators sit at terminals and key data to a disk • Data stored on disk is later added to main data set • Supervisor can see all operators data entry speeds and number of errors!

  8. Key to Disk (2)

  9. MICR • Used by banks for cheque processing • Advantages • It is hard to forge the characters • The characters can be read even if the cheque is crumpled, dirty or smudged • The characters are readable by humans, unlike bar codes • Disadvantages - COST

  10. Bar Codes (1) • The pattern of lines represents numbers underneath! • A barcode consists of • Country (2 or 3) • Manufacturers code (5) • Represent product details (5) • Check digit (1) • What benefits might a supermarket get from using bar codes?

  11. Other uses for Bar Codes • Warehousing • bar coded containers of raw materials are stored in racks of bins which are also bar coded. • Medical • bar codes used to identify blood and other samples. • Libraries • used to record loans and track stock. • Banking, insurance and local government • for document control and retrieval.

  12. Any Others? • Magnetic Stripe • Smart Cards • OMR • ????

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