Satellite Image Resolution Enhancement Using Non-Decimated Wavelet Transform and Gaussian Mixture Model
T. V. Hyma Lakshmi, T. Madhu, E V Krishna Rao, K. Ch. Srikavya · International Journal of Applied Engineering Research · 2015
High resolution satellite images are of significant importance in many fields of research and its enhancement is an active research area.Among various techniques used for image resolution enhancement Wavelet based techniques have been found to be very efficient.Discrete Wavelet Transform (DWT) is mostly used in image decomposition stage but suffers from shift variance.In this work Non-Decimated Wavelet Transform (NDWT) which is shift invariant is investigated.Instead of Bicubic interpolation Gaussian Mixture Model (GMM) which is a parametric probability density function represented as a weighted sum of Gaussian component densities is used instead of weighted sum of neighborhood pixels used by bicubic and bilinear interpolations.The proposed technique showed improved Peak Signal to Noise Ratio (PSNR) and Quality Index.