Dynamic Selection of Suitable Wavelet for Effective Color Image Compression using Neural Networks and Modified RLC

Abstract

Image Compression has become extremely important today with the continuous development of internet remote sensing and satellite communication techniques In general single Wavelet is not suitable for all types of images This paper proposes a novel approach for dynamic selection of suitable wavelet and effective Image Compression Dynamic selection of suitable wavelet for different types of images like natural images synthetic images medical images and etc is done using Counter Propagation Neural Network which consists of two layers Unsupervised Kohonen SOFM and Supervised Gross berg layers Selection of suitable wavelet is done by measuring some of the statistical parameters of image like Image Activity Measure IAM and Spatial Frequency SF as they are strongly correlated with each other After selecting suitable wavelet effective image compression is done with MLFFNN with EBP training algorithm for LL2 component Modified run length coding is applied on LH2 and HL2components with hard threshold and discarding all other sub-bands which do not effect much the quality both subjective and objective HH2 LH1 HL1 and HH1 Highest CR 191 53 PSNR 78 38 dB and minimum MSE 0 00094 of still color images are obtained compared to SOFM EZW and SPIHT