Title: An efficient compression technique using Lempel-Ziv algorithm based on dynamic source encoding scheme

Authors: Ahmed Musa, Ayman Al-Dmour, Osama Al-Khaleel, Mansour Irshid

Addresses: Department of Computer Engineering, Al-Hussein Bin Talal University, P.O. Box 20, Ma'an, Jordan. ' Department of Computer Information Systems, Al-Hussein Bin Talal University, P.O. Box 20, Ma'an, Jordan. ' Department of Computer Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan. ' Department of Electrical Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan

Abstract: This paper proposes an efficient text compression technique based on dynamic source encoding scheme using Lempel-Ziv algorithms. A statistical analysis is performed to count the occurrence of each character in the original source. Accordingly, each character is replaced by a weighted fixed-length code in lieu of arbitrary codes such as ASCII. This replacement generates an equivalent binary source with two symbols zero and one. Thereafter, the bitwise Lempel-Ziv algorithms can be applied to the nth-order extension binary source that contains 2n symbols. As a result, the proposed technique achieves a high compression ratio in comparison with those techniques that use static and arbitrary source encoding schemes. In the decompression process, a header file includes all characters sorted in descending order based on their frequency of occurrences along with the extension order (n) is received. Thus, each character can be restored back based on the code shared between the compression and decompression processes.

Keywords: text compression; Lempel-Ziv algorithm; ASCII code; dynamic source encoding; source entropy.

DOI: 10.1504/IJICT.2010.032409

International Journal of Information and Communication Technology, 2010 Vol.2 No.3, pp.210 - 219

Published online: 02 Apr 2010 *

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