The Hatch filter is a code-smoothing technique that uses the variation of the carrier phase. It can effectively reduce the noise of a pseudo-range with a very simple filter construction, but it occasionally causes an ionosphere-induced error for low-lying satellites. Herein, we propose an optimal single-frequency (SF) divergence-free Hatch filter that uses a satellite-based augmentation system ...

PURPOSE To assess the impact of blue-light filtering on retinal processing to evaluate potential side effects of these filters on visual function at the neural level. SETTING Department of Ophthalmology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany. DESIGN Cohort study. METHODS Multifocal electroretinograms (ERGs) were recorded monocularly after pupil dilation in pseudophaki...

BACKGROUND Denoising with edge preservation is very important in digital x-ray imaging since it may allow us to reduce x-ray dose in human subjects without noticeable degradation of the image quality. In denoising filter design for x-ray imaging, edge preservation as well as noise reduction is of great concern not to lose detailed spatial information for accurate diagnosis. In addition to this,...

Problem statement: The visual effects of blocking artifacts can be reduce by using deblocking filter. Also with out smoothing the natural edges,the perceived quality of video sequence can be enchanced. This study propose a method to remove blocking artifacts in low bit-rate block based video coding. Approach: The proposed algorithm has two separate filtering modes, which are selected by pixel b...

The algorithm consists of an anisotropic weighting model, which is designed to catch more information in horizontal than vertical directions. The filter-based compensation methodology which includes a Laplacian and spatial sharpening filters, which are developed to improve the edge information and reduce the blurring effect and an edge detector. By using these technique hardware cost is success...

A system is introduced that increases the information density of textual presentation by reconsidering text as pictures, expanding the range of written expression. Indicating nested associativity with stripes, Zebrackets uses small-scale horizontal striations, superimposed on parenthetical delimi t e r~ . This system is implemented as an active filter that re-presents textual information graphi...