tailieunhanh - Báo cáo hóa học: " A survey of classical methods and new trends in pansharpening of multispectral images"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : A survey of classical methods and new trends in pansharpening of multispectral images | Amro et al. EURASIP Journal on Advances in Signal Processing 2011 2011 79 http content 2011 1 79 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal REVIEW Open Access A survey of classical methods and new trends in pansharpening of multispectral images 1 3 1 4 Israa Amro Javier Mateos Miguel Vega Rafael Molina and Aggelos K Katsaggelos Abstract There exist a number of satellites on different earth observation platforms which provide multispectral images together with a panchromatic image that is an image containing reflectance data representative of a wide range of bands and wavelengths. Pansharpening is a pixel-level fusion technique used to increase the spatial resolution of the multispectral image while simultaneously preserving its spectral information. In this paper we provide a review of the pan-sharpening methods proposed in the literature giving a clear classification of them and a description of their main characteristics. Finally we analyze how the quality of the pansharpened images can be assessed both visually and quantitatively and examine the different quality measures proposed for that purpose. 1 Introduction Nowadays huge quantities of satellite images are available from many earth observation platforms such as SPOT 1 Landsat 7 2 IKONOS 3 QuickBird 4 and OrbView 5 . Moreover due to the growing number of satellite sensors the acquisition frequency of the same scene is continuously increasing. Remote sensing images are recorded in digital form and then processed by computers to produce image products useful for a wide range of applications. The spatial resolution of a remote sensing imaging system is expressed as the area of the ground captured by one pixel and affects the reproduction of details within the scene. As the pixel size is reduced more scene details are preserved in the digital representation 6 . The instantaneous field of view IFOV is the ground area sensed at a given instant of time. The