G Uma Rani and G Indumathi, CMRIT, India

Recent years have seen tremendous increase in the generation, transmission, and storage of color images. A new lossless image compression method for progressive-resolution transmission of color images is carried out in this paper based on spatial and spectral transforms. Reversible wavelet transforms are performed across red, green, and blue color sub bands first. Then adaptive spectral transforms like inter band prediction method is applied on associated color sub bands for image compression. The combination of inverse spectral transform (ST-1) and inverse reversible wavelet transforms (RWT-1) finally reconstructs the original RGB color channels exactly. Simulation of the implemented method is carried out using MATLAB 6.5.

Spatial transforms, Spectral decorrelation, S-transform,inter band prediction,PSNR.