DIGITAL IMAGE COMPRESSION USING INTEGER BASEDTRANSFORM ALGORITHM

A. Sulttan, Bushra

	DIGITAL IMAGE COMPRESSION USING INTEGER BASEDTRANSFORM ALGORITHM
Journal of Al-Nahrain University - Science
Article 1, Volume 12, Issue 3, 2009, Pages 177-183
Author
Bushra A. Sulttan
Abstract
AbstractOne of the most problems in computer application is the storage and transmission of imagesthat makes the field of developing the image compression. For that, various compression methodshave been proposed using different techniques to achieve high compression ratios and high imagequality. One of the image compression methods is transformed based image compression usinginteger wavelet transform (IWT), which is the main purpose of this paper. This paper describes analgorithm of compression and decompression using (IWT). In IWT, we perform all possibledecomposition of an image (i.e. until image size 2×2), after that the resultant coefficients arearranged according to their impotency using zigzag arrangement and divided on factor related totheir impotency (increase the factor with low impotency), to make low impotency coefficientrelated to zero. Remap the values to the range (1.255) (i.e. byte). Then perform lossy or losslessRun Length Coding (RLC) to construct the codebook of the compressed image. The effects ofdifferent RLC and different initial quantization factor, image contents and compression ratiosassessed. The results provide a good reference for application developers to choose a good waveletcompression system for their application
Keywords
integer wavelet transforms IWT; Run Length Coding RLC; transform based image compression

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