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Compression (Lossless (: Patterns in the data are spotted and summarised,…
Compression
Lossless
: Patterns in the data are spotted and summarised
resultant file sizes not as small as lossy,
but exact quality retained
Good for text files and code
No data is lost
Run length encoding
Works well with image and sound data where data could be repeated many times
Dictionary compression
Spots regularly occurring data and stores it separately in a dictionary
Even though the dictionary produces additional overheads the space saving negates this problem
Lossy
Good for sound and images - Permanent removal of non-essential data
examples
mp3 files
smaller file sizes, but poorer quality
jpeg files
The process of reducing number of bits required to represent data
Why Compress?
Smaller storage requirements
Quicker access on internet (streaming)
Lesser interference
Quicker transportation of data
lesser bandwidth needed
