Document Abstract
Satellite images are used in various applications. Satellite images acquired are generally blurry and noisy. Thus enhancement of images is a needed process. It is a strong research topic in Image processing. Main motive behind enhancement is to get an image more effective than the original image for different remote sensing applications. Various choices of techniques are available for improving quality of satellite images. Here, enhancement by machine learning methods for image fusion acts a prominent role. It efficiently combines image content and then enhances information present in each datasets. This article provides overviews of the existing fusion enhancement techniques. Till now various techniques have been proposed for enhancing digital images. Some of them can be used for enhancing satellite images. It was found that fusion-based enhancement performs better than non-fusion based enhancement techniques. This review paper will give a survey of various fusion-based enhancement techniques. Based on application best methods among various techniques have been discussed.