Abstract: Satellite images are used in various field of research and applications. The major limitation of satellite images are its resolution. Therefore image resolution enhancement is very necessary and first step in image processing. To modify an image under some consideration so that the obtained image is superior than the original image for specified application is image resolution enhancement. Resolution enhancement of images can be performed in different domain such as Spatial and Transform domain. Images with high resolution give better result for a specific application. Different image enhancement methods based on transform domain are Discrete Cosine Transform (DCT), Discrete Wavelet Transform (DWT), Stationary Wavelet Transform (SWT), DWT with SWT, Dual-Tree Complex Wavelet Transform (DT-CWT), DT-CWT with cycle spinning. In this paper, it has been discussed about different image enhancement techniques based on transform domain and interpolation methods. All the techniques are discussed and compared on satellite benchmark images and the analytical results of all these shows supremacy of methods over each other.
Keywords: Satellite images, DWT, DCT, SWT, DWT with SWT, DT-CWT, DT-CWT with CS, Interpolation