Pan-sharpening methods are commonly used to synthesize multispectral and panchromatic images. Selecting an appropriate algorithm that maintains the spectral spatial information content of input images is a challenging task. This review paper investigates wide range algorithms, including 41 methods. For this purpose, were categorized as Component Substitution (CS-based), Multi-Resolution Analysi...

Introduction: Filtering can greatly affect the quality of clinical images. Determining the best filter and the proper degree of smoothing can help to ensure the most accurate diagnosis. Methods: Forty five patient’s data aquired during brain phantom SPECT studies were reconstructed using filtered back-projection technique. The ramp, Shepp-Logan, Cosine, Hamming, Hanning, Butterworth, Metz...

Satellite data are very useful for the continuous monitoring of ever-changing environments, such as wetlands. In this study, we investigated use multispectral imagery to monitor winter evolution land cover in Albufera wetland (Spain), using Landsat-8 and Sentinel-2 datasets. With data, frequency observation is limited by possible presence clouds. To overcome problem, acquired two missions, Sent...

snow cover area is one of the most important criteria to calculate snow melt runoff. this can have an effect on the biology of the plant and the environment of a region. using the catchment basin physical characteristic to calculate snow cover area is a conventional method, though its accuracy is not good enough. most of the useful methods in calculating snow cover area are based on satellite i...

because of large-scale dry regions, salt marsh monitoring is necessary using of remote sensing data's. the aim of this study is to monitor salt kashan using of satellite data's processing. therefore, the satellite images of lissiii sensor were used. initially, the technique of color composite images envi4.8 software was used to clearly distinguish salt. then, principal component analy...

objective(s): a novel iq-specttm method has become widely used in clinical studies. the present study compares the quality of myocardial perfusion images (mpi) acquired using the iq-specttm (iq-mode),conventional (180° apart: c-mode) and l-mode (90° apart: l-mode) systems. we assessed spatial resolution, image reproducibility and quantifiability using various physical phantoms. materials and me...

Affected by solar radiation, atmospheric windows, radiation aberrations, and other air sky environmental factors, remote sensing images usually contain a large amount of noise suffer from problems such as non-uniform image feature density. These bring great difficulties to the segmentation high-precision image. To improve effect images, this study adopted an improved metaheuristic algorithm opt...