Data Capture


Background:

In this section you should be able to:


What is a computer system?

 


Introduction to Data Capture:


Data Capture Methods:


 

Task 1:

Method

Keyboard

Key-to-disk

Voice / Speech recognition

Scanners

Optical Character Recognition (OCR);

Optical Mark Recognition (OMR);

Bar Code reading / Light pen

Magnetic Ink Character Recognition (MICR);

Magnetic Strip Readers;

Sensors; Touch-screens; Mouse; Graphics Tablet, Data Loggers; Microphone etc.

 

Useful Internet Sites:


Bar codes

2 digits

5 digits

5 digits

1 digit

Country of product

Manufacturer

Produce

Check digit

 


Task 2:


Test yourself


Direct vs Indirect Data Collection:

Direct

Data collected for specific purpose

  • e.g. Details of customer borrowing DVD
Indirect

Data is used to create information that is not related to the original purpose

  • e.g. Details of customer borrowing habits to find out what category they borrow most

Information may have a commerical value

 


Data Encoding:

Data needs to be encoded:

Codes used for data:


Comparison of different data representation codes:
Comparison of different data representation codes

 

Coding data for data entry:

Coding Data Before Data is Input:

 

Advantages Disadvantages
  • Reduces input errors - less data to input
  • Encoding can coarsen data - data may not fit into predefined categories
  • Speeds up data entry - quicker to enter a short code than a sentence
  • Consistent data - avoids variations of data, e.g. ICT, IT, Information Technology
  • Subjective judgements - difficult to code value judgements or opinions
  • Less memory required to store data - speeds up processing data

 

When is data encoded?



Now do the questions at the end of Chapter 14 & 15 of the text book