Decompression software in the transfer of information: Difference between revisions
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== Evaluation of lossy compression == | == Evaluation of lossy compression == | ||
Credit to [https://www.cs-ib.net/sections/C-03-distributed-approaches-to-the-web.html these guys for this material!] | |||
* Significant reduction of file size –> important for file storage, transfer of data over the internet | * Significant reduction of file size –> important for file storage, transfer of data over the internet | ||
* E.g. image files can be reduced to be around 90% smaller before quality degradation is noticeable | * E.g. image files can be reduced to be around 90% smaller before quality degradation is noticeable | ||
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** Decompression speed | ** Decompression speed | ||
** Compression ratio | ** Compression ratio | ||
== Evaluation of lossless Compression == | == Evaluation of lossless Compression == | ||
Revision as of 16:57, 12 January 2018
Web Science[1]
Evaluation of lossy compression[edit]
Credit to these guys for this material!
- Significant reduction of file size –> important for file storage, transfer of data over the internet
- E.g. image files can be reduced to be around 90% smaller before quality degradation is noticeable
- Most important use is streaming multimedia files and VoIP –> bandwidth is usually limited
- However, doesn’t work with all file types –> text files or binary data cannot be compressed in a lossy way, as the meaning of the data are lost
- Different things to consider:
- Compression speed
- Decompression speed
- Compression ratio
Evaluation of lossless Compression[edit]
- When compressing a file if decompressed will have the same data/Information as the initial file
- Important when compressing an installation file and programs
- It is required that the installation files and programs’ information is the same in the compressing and decompressing phase
- No loss in quality in lossless compression in Images and Audio files
- Larger file sizes than lossy compressions
Do you understand this?[edit]
From the IB: Students can test different compression methods to evaluate their effectiveness.
Standards[edit]
These standards are used from the IB Computer Science Subject Guide[2]
- Evaluate the use of decompression software in the transfer of information.
References[edit]
- ↑ http://www.flaticon.com/
- ↑ IB Diploma Programme Computer science guide (first examinations 2014). Cardiff, Wales, United Kingdom: International Baccalaureate Organization. January 2012.