Document Abstract
Satellite images are used in many fields of research (eminence factors in images comes from its resolution) and in many applications such as astronomy, geographical information systems & geosciences studies. Satellite images may be blurred or not clear due to many reasons. Therefore the important information in the images may be not so clear. Image enrichment can improve a satellite image which has complete information but is not visible. Image enrichment method is used to improve the eminence of the image to get useful information. Many methods have been developed to enhance the satellite images. Objective of this paper is to give information and methods which are useful in satellite image enrichment purpose. General issues of satellite images are enrichment of gray-scale/colour image, noise, artifacts, distortion, large size, resolution, weak colour information, high frequency content and many more. Here given a discussion of the previous work of authors to deal with these issues. So that information which is visible from the image is more informative and helpful to human beings in many applications.