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Gray Scale Image Compression Based on Wavelet Transform and Linear Prediction

Author(s): Arya Devi P S | M.G.Mini

Journal: International Journal of Multimedia & Its Applications
ISSN 0975-5934

Volume: 4;
Issue: 1;
Start page: 47;
Date: 2012;
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Keywords: Image Compression | bits per pixel (bpp) | wavelet transform | linear predictive coding (LPC) | correlation

Every year, several terabytes of image data- both medical and non medical- are engendered so that the requisition for image compression is substantiated. In this paper, the correlation properties of wavelets are harnessed in linear predictive coding to compress images. The image is decomposed using a one dimensional wavelet transform. The highest level wavelet transform coefficients and few detail coefficients in every level are retained. Using linear prediction on these coefficients the image is reconstructed. The prediction is done in both the dimensions, so the numbers of coefficients retained in detail subbands are less. With less predictors and samples from the original wavelet coefficients compression can be achieved. The results are appraised in objective and subjective manner with real world and medical images. The results are also verified on ModelFest database.
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