Data compression source coding
Text compression techniques
Data compression can dramatically decrease the amount of storage a file takes up.
For example, in a 2:1 compression ratio, a 20 megabyte (MB) file takes up 10 MB of space.
As a result of compression, administrators spend less money and less time on storage..
What is data compression in coding?
What is Data Compression? Data compression is the process of encoding, restructuring or otherwise modifying data in order to reduce its size.
Fundamentally, it involves re-encoding information using fewer bits than the original representation..
What is encoding in data compression?
Encoding converts data into a standard format and increases performance because there is less disk I/O during query execution.
It also passes encoded values to other operations, saving memory bandwidth..
What kind of coding is used for compressing data?
*Huffman compression* is a statistical data compression technique which gives a reduction in the average code length used to represent the symbols of a alphabet.
The Huffman code is an example of a code which is optimal in the case where all symbols probabilities are integral powers of 1/2..
- Digram coding is a static dictionary technique that is less specific to source data.
In digram coding, the dictionary consists of all letters of the source alphabet fol- lowed by as many pairs of letters, called digrams, as can be accommodated by the dictionary [14].
The process of reducing the size of a data fileis often referred to as data compression. In the context of data transmission, it is called source coding: encoding is done at the source of the data before it is stored or transmitted.
