ACQUISTION OF TEXTUAL DATA IN SIMPLE WORDS

 ACQUISTION OF TEXTUAL DATA IN SIMPLE WORDS

Let me explain Textual data in a flow diagram;

The simple way of input of textual data is manual entry using keyboard.

The text will be stored in ASCII code or Unicode in computer's memory.

Advantages of textual data: 

• The number of Bits stored is very small.
• Very easy to manage and edit.

Disadvantages of textual data:

• It is slow because it is entered manually
• It is really very expensive, to hire people and write.
• Humans may make mistake as they enter manually.
• Image cannot be inserted.

There are some alternative for manual entry.

The standard method used today is image scanner.

An image scanner scans the data and stores in 0 and 1s.

Some best alternative to manual typing;

1. Flatbed scanner
2. Sheet bed scanner
3. Drum scanner
4. Hand held scanner

Drum scanners are more expensive but gives best performance.

Hand held scanners are very cheap, gives a worst performance.

Flatbed scanners cheap and good at performance.

All the four types of data can be scanned through these scanners.

In my next article I have given a brief explanation about the different types of scanners.