1. Data Capture
F451 - AS Computing

2. Data and Information Data Information Raw Facts and Figures
No structure or context
Information
Structured, Organised Data
Processed Data

3. A Good Example

4. Barcodes Barcode (Data) is scanned - Input Data Capture
Data is Processed
The price and item name is the Output

5. How can computers gather data?
Sensors
Magnetic strips
Smart cards
Barcodes
Magnetic ink character recognition (MICR)
Optical mark recognition (OMR)
Optical character recognition (OCR)
Voice recognition

6. Input/Output Devices Example
Supermarket Checkout
Input Devices
Barcode Reader
Scales
Chip & Pin Reader
Touch Screen

7. Input/Output Devices Example
Supermarket Checkout
Output Devices
Screen
Receipt Printer
Speaker

8. Use of Barcodes
Thickness of each line represents number that corresponds an item in the store
Each item has a unique number
Number is looked up on a central database to find the item name and price

9. Reading a Barcode
Laser/Infra red beam used to detect thickness of each line
Barcode numbers usually have start/stop lines and a check digit

10. Databases in Barcode Systems
Scanned number of barcode is looked up on stock database
Stock can be incremented/decremented automatically when barcodes are scanned.
Automated stock control systems. Real time systems. Always upto date.
Used in warehouses, supermarkets

11. Operating a Computer
INPUT
PROCESS
OUTPUT

12. MICR – Magnetic ink recognition
Printed at the bottom of a cheque
Can be read at very high speeds
Read with 100% accuracy

13. Optical mark recognition
Machines read pre-printed sheets and check for marks in certain places on them
Used for:
Lottery numbers
Multiple choice exams
Registration

14. Optical Character recognition
Hardware captures images
Software compares shapes with stored data