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Data compression techniques
Faculty
Computer Science
Year:
2004
Type of Publication:
Theses
Pages:
117
Authors:
Ehab Rushdy Mohamed
BibID
10582874
Keywords :
Data compression (Telecommunication)
Abstract:
1 Data compression is a topic of much importance and many applications. Methods of data compression have been studied for almost four decades. This thesis has provided an overview of data compression methods of general utility. A framework for evaluation from the experimental results accomplished in chapter 8, we introduce the following conclusions:• The family of PPM especially PPMD proved to be the best performer based on the amount of compression ratio and the absolute worst when the speed is considered.• The dictionary algorithms especially LZW achieve the best performer based on the speed and the compression ratio is not the best.<br The data compressing system based on BWT is attracting attention for its simplicity; also, the compression ratio achieve•The modifications that added to LZ77 algorithms, which are referred to as LZARI, and LZHUF improve the amount of compression ratio and decrease the speed.• Using the principle of exclusion improves the amount of compression ratio in PPMC family.• Using unbounded length contexts for PPM which is referred to as PPM* improves the performance of PPMC family.• The effects of the cascading obtained by using MTF and RLE algorithms with BWT algorithm improve the performance. In addition, the modifications that are added to these algorithms provide higher performance.Consequently, it is strongly recommended for users to use PPM family especially PPMD for compressing their files if the compression ratio is the main object, regardless the time. In addition, it is better to use the dictionary techniques especially LZW if8.2 Suggestions for Future WorkIn this section, we will introduce further enhancement to be added to the proposed work.• As indicated in the previous chapter, extending the present work to include non-textual data such as graphics, digitally sampled sound/speech and movies would benefit those individuals whose compression needs go beyond simple text. Given the graphical o• Another thesis to consider in this area would be the development of a new compression technique. As has been done in the past, this new compression technique would most likely be a modification to an existing algorithm. Given the performance of the pres• Another extension to the thesis is to exploit the neural network in developing efficient data compression techniques for textual and non-textual files.• Finally, an obvious extension to this thesis would be to implement a larger body of algorithms and to take algorithms in larger combinations. Another extension using the present body as a starting point would be to implement some of the optimizations pr
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Ehab Rushdy Mohamed, "Data compression techniques", 2004
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