in this study, we used monthly palmer severity drought index (pdsi) data of national center of oceanic atmospheric administration (noaa) during 1/1950 to 12/2005(56 year). the time and space resolution of data is monthly and 2.5*2.5 degree respectively. therefore 26 pixels located in iran political boundary. a matrix 26*672 carried out that pixels located on rows and month located on column. th...

Stage of phase unwrapping is of highest importance in the DEM generation by means of SAR interferometry. In the case of interferometric fringes merging in the areas of steep topography or in the case of poor quality of interferogram because of spatial/temporal/noise decorrelation the chances to resolve phase ambiguity across the entire SAR scene may become very low. We propose new way of local ...

Background: Regarding the importance of right diagnosis in medical applications, various methods have been exploited for processing medical images solar. The method of segmentation is used to analyze anal to miscall structures in medical imaging.Objective: This study describes a new method for brain Magnetic Resonance Image (MRI) segmentation via a novel algorithm based on genetic and regiona...

Traditional supervised band selection (BS) methods mainly consider reducing the spectral redundancy to improve hyperspectral imagery (HSI) classification with class labels and pairwise constraints. A key observation is that pixels spatially close to each other in HSI have probably the same signature, while pixels further away from each other in the space have a high probability of belonging to ...

Reliability of image sensors is limited by the continuous development of in-field defects. Laboratory calibration on 21 DSLRs has revealed hot pixels as the main defect type found in all tested cameras, with 78% of the identified defects having a time-independent offset. The expanded ISO range that exists in new cameras enables natural light photography. However, the gain applied to all pixels ...

The surface of Mars is currently being imaged with an unprecedented combination of spectral and spatial resolution. This high resolution, and its spectral range, give the ability to pinpoint chemical species on the surface and the atmosphere of Mars moreaccurately than before. The subject of this paper is to present a method to extract informations on these chemicals from hyperspectral images. ...