Data Capture F451 - AS Computing.

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Presentation transcript:

Data Capture F451 - AS Computing

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

A Good Example

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

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

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

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

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

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

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

Operating a Computer INPUT PROCESS OUTPUT

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

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

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

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