Data compression notes

  • Text compression techniques

    Compression means the writer is being selective; she's being careful about what goes in and what stays out.
    She is making choices..

Data compressionis about storing and sending a smaller number of bits. decompression are exactly the same. Because, in these methods, the compression and decompression algorithms are exact inverses of each other. Redundant data is removed in compression and added during decompression.

How does compression affect coding redundancy?

Compression reduces the cost of storage, increases the speed of algorithms, and reduces the transmission cost.
Compression is achieved by removing redundancy, that is repetition of unnecessary data.
Coding redundancy refers to the redundant data caused due to suboptimal coding techniques.

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Why is compression important?

One would have noticed that many compression packages are used to compress files.
Compression reduces the cost of storage, increases the speed of algorithms, and reduces the transmission cost.
Compression is achieved by removing redundancy, that is repetition of unnecessary data.

What are the two types of data compression?

You will recall that in the Introduction, we said that data compression essentially consists of two types of work: modelling and coding

It is often useful to consciously consider the two entities of compression algorithms separately

2 The general model is the embodiment of what the compression algorithm knows about the source domain

What is data compression & why is it important?

Let’s discuss it one by one

One important area of research is data compression

It deals with the art and science of storing information in a compact form

One would have noticed that many compression packages are used to compress files

Compression reduces the cost of storage, increases the speed of algorithms, and reduces the transmission cost

What is the compression ratio & compression factor?

The compression ratio is 1/4 and the compression factor is 4

The saving percentage is: 75% In addition, the following criteria are normally of concern to the programmers: 2 Overhead

Overhead is some amount of extra data added into the compressed version of the data


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