Many conventional blind image deconvolution algorithms have much processing time because the consideration of various cases and the optimization are required for general employment. Moreover, these algorithms are also complex to deal with various point spread functions (PSF). Therefore, this paper restricts the type of PSF to the dual-exposure type and proposes effective PSF search algorithm, u...

A glycoprotein that stimulates the proliferation of multiple hemopoietic stem and progenitor cell types was purified to apparent homogeneity. The factor, termed P cell-stimulating factor (PSF), was assayed by its ability to support the growth of murine factor-dependent hemopoietic cell lines operationally termed persisting cells (P cells). PSF was purified 50,000-fold from serum-free medium con...

Finely sampled observational spectroscopic point spread functions (PSFs) have been generated from exposures of stars. Lyot stops near the pupil plane of the STIS G430L and G750L gratings block some scattered and diffracted light at the expense of reducing the throughput and broadening the PSF. For G750L, perpendicular-to-slit stepping patterns were performed across a star with the 52x0.1, 52x0....

Background The most important advantage of positron emission tomography/computed tomography (PET/CT) imaging is its capability of quantitative analysis. The aim of the current study was to choose the proper standardized uptake value (SUV) threshold, when the time-of-flight (TOF) and point spread function (PSF) were used for respiratory artifact reduction in the liver dome in a new-generation PE...

UNLABELLED Time-of-flight (TOF) PET uses very fast detectors to improve localization of events along coincidence lines-of-response. This information is then utilized to improve the tomographic reconstruction. This work evaluates the effect of TOF upon an observer's performance for detecting and localizing focal warm lesions in noisy PET images. METHODS An advanced anthropomorphic lesion-detec...

in this study, we focused on detailed studies on micromorphological and mineralogical properties of three types of peat and swamp, to compare these different ecological area together. to achieve this goal, samples from a highland peat swamp (ghaleh-ghafeh ps), a peat swamp forest (suteh psf) and a costal swamp (galougah cs) in golestan province, north of iran have been considered. these studies...

This paper investigates the implementation of Periodic Symmetric Functions (PSF) in single electron tunneling technology. First, we discuss the procedure of expressing arithmetic and logic operations as generalized PSFs. Second, we propose a building block that performs a multiple input PSF. The block we propose can be used for the computation of any function that is or can be expressed as a PS...

The point-spread function (PSF) of a camera can seriously affect the accuracy of radiometric calibration and measurement. We found that the PSF can produce a 3.7% difference between the apparent measured radiance of two plaques of different sizes with the same illumination. This difference can be removed by deconvolution with the measured PSF. To determine the PSF, many images of a collimated b...

We present results of concurrent maximum likelihood restoration implementations with spatially-variant point spread function (SV-PSF) on both synthetic and real datasets from the Hubble Space Telescope (HST). We demonstrate that SV-PSF restoration exhibits superior performance compared to restoration with a spatially invariant PSF. We realize concurrency on a network of Unix workstations, and a...