Comparative Analysis of Various Enhancement Methods for Satellite Images

Abstract

In this paper, a comparison of the satellite image contrast enhancement techniques is being carried out. Satellite images are being used in many fields of research. One of the major issues of these types of images is their resolution. Here discrete wavelet transform (DWT) is used as a base and two techniques for enhancing the images are compared. The DWT technique decomposes the input image into the four frequency subbands and in the first method it estimates the singular value matrix of the low-low subband image, and, then, it reconstructs the enhanced image by applying inverse DWT. The second technique is based on the interpolation of the highfrequency subbands obtained by discrete wavelet transform (DWT) and the input image. The high-frequency subband images and the input low-resolution image are interpolated and then combined together to generate a new resolution-enhanced image by using the inverse DWT technique. The experimental results show the comparison between the two methods which help us to make a choice for better satellite image enhancement technique.