نتایج جستجو برای: psf estimation
تعداد نتایج: 264787 فیلتر نتایج به سال:
Poststroke fatigue (PSF) is a debilitating but often neglected consequence of stroke. This cross-sectional study evaluated the prevalence of PSF among one hundred stroke survivors receiving physiotherapy in North-east Nigeria. Demographic and clinical data were obtained while PSF was assessed with the 9-item Fatigue Severity Scale. Descriptive and Chi-square statistics were used to respectively...
The oncogenic fusion tyrosine kinase nucleophosmin/anaplastic lymphoma kinase (NPM/ALK) induces cellular transformation in anaplastic large-cell lymphomas (ALCLs) carrying the t(2;5) chromosomal translocation. Protein-protein interactions involving NPM/ALK are important for the activation of downstream signaling pathways. This study was aimed at identifying novel NPM/ALK-binding proteins that m...
Conventional point spread function (PSF) measurement methods often use parametric models for the estimation of the PSF. This limits the shape of the PSF to a specific form provided by the model. However, there are unconventional imaging systems like multispectral cameras with optical bandpass filters, which produce an ab-normal, e.g., unsymmetric PSF. To estimate such PSFs we have developed a n...
This paper describes a method for blind estimation of sharpness and resolving power from a single image. These measures can be used to characterize images in the context of the performance of image analysis procedures. The method assumes the point spread function (PSF) can be approximated by an anisotropic Gaussian. The width of the PSF is determined by the ratio of the standard deviations of t...
the smear extent of the blurred image of a point object The problem of restoration of images blurred by relative in the original image. Extraction of the blur extent has motion between the camera and the object scene is important significant meaning in identification of the motion-blur in a large number of applications. The solution proposed here PSF. Cannon [1] dealt with the case of uniform l...
The resolution of ultrasound medical images is yet an important problem despite of the researchers efforts. In this paper we presents a nonlinear blind deconvolution to eliminate the blurring effect based on the measured radiofrequency signal envelope. This algorithm is executed in two steps. Firslty we make an estimation for Point Spread Function (PSF) and, secondly we use the estimated PSF to...
Point spread function (PSF) plays an essential role in image reconstruction. In the context of confocal microscopy, optical performance degrades towards the edge of the field of view as astigmatism, coma and vignetting. Thus, one should expect the related artifacts to be even stronger in macroscopy, where the field of view is much larger. The field aberrations in macroscopy fluorescence imaging...
This paper proposes an algorithm which uses image registration to estimate a non-uniform motion blur point spread function (PSF) caused by camera shake. Our study is based on a motion blur model which models blur effects of camera shakes using a set of planar perspective projections (i.e., homographies). This representation can fully describe motions of camera shakes in 3D which cause non-unifo...
Motion blur in images is usually modeled as the convolution of a point spread function (PSF) and the original image represented as pixel intensities. The knife-edge function can be used to model various types of motion-blurs, and hence it allows for the construction of a PSF and accurate estimation of the degradation function without knowledge of the specific degradation model. This paper addre...
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