Review on different methods of image fusion of multispectral and panchromatic image

There are various sensors invented to capture the images of earth surface which are used to analyze the earth surface. The images captured by different sensors have different features. To analyze the earth surface images captured at different spectrums are used. In urban area characteristic of urban object are determined by not only their spectra but also by their structure. Various sensors captures the image at various spectrums knows as multispectral image but is with low spatial resolution. Some sensors captures the high resolution image also known as panchromatic image. Therefore it becomes very necessary and useful to fuse panchromatic and multispectral image to detect different area from the image easily. The fused image is multispectral image with high spatial resolution. The various methods of image fusion studied in this paper. Comparison of them is done is done statistically and visually and it is found that fused image is of greater quality and clarity than the original one and shows the features of that area more accurately.