نتایج جستجو برای: masking
تعداد نتایج: 11622 فیلتر نتایج به سال:
Recent NICMOS observations of the central regions of nearby barred galaxies, NGC5383, NGC1530 and NGC1667 by Regan, Sheth and Mulchaey (1999), all show, in the unsharp mask map, a pair of distinct trailing spirals which can be followed all the way to the center. This result is in apparent conflict with the density wave theory. In this report, we argue that this difficulty may be removed if we t...
Previous research has revealed that dyslexic children may be more sensitive to backward-masking effects in auditory perception than control children. In this study, we asked whether a CV transition masks a preceding VC transition to a greater extent in dyslexic children than in controls. The results suggest that dyslexic children are severely impaired on the discrimination of VC sequences, rega...
Image bias is a usual phenomenon in MR imaging when using surface coils. It complicates the interpretation as well as the algorithmic postprocessing of such data. We introduce a bias correction algorithm based on homomorphic unsharp masking (HUM) that is applicable on a broad range of image types (as long as foreand background is separable), simple, fast and requires only minimal user interacti...
The DØ (DZERO) Detector at Fermilab has been collecting data since March 1, 2001. The detector has undergone an extensive upgrade to participate in the Run 2 data taking. The design of the detector meets the requirements of the high lumi-nosity environment provided by the accelerator. This paper describes the upgraded detector subsystems and gives an outline of the physics potentials associated...
The lifetime of the B + c meson is measured using semileptonic decays having a J/ψ meson and a muon in the final state. The data, corresponding to an integrated lumi-nosity of 2 fb −1 , are collected by the LHCb detector in pp collisions at a centre-of-mass energy of 8 TeV. The measured lifetime is τ = 509 ± 8 ± 12 fs, where the first uncertainty is statistical and the second is systematic.
This paper presents a method to suppress the bias artifact, also known as RF-inhomogeneity, in Magnetic Resonance Imaging (MRI). This artifact produces illumination variations due to magnetic field fluctuations of the device. In the latest years many works have been devoted to face this problem. In this work we present the 3D version of a new approach to bias correction, which is called Exponen...
In this paper, we present an Unsharp Masking-based approach for edge enhancing for TV application. The proposed scheme enhances the true details, limits the overshoot near sharp edges and attenuates the temporal artifacts which are visible in an image sequence. Simulations show that the processed sequence presents sharp edges which make it more pleasant to the human eye. Moreover, the amount of...
Loftus, Johnson, and Shimamura (1975) displayed a test stimulus (a picture) followed by a masking stimulus either immediately or after a 300-ms delay. They attributed the superior performance obtained with the delayed mask to the continued availability of a visible icon. Here I suggest that Loftus et al.'s explanation is questionable on empirical and on conceptual grounds. Instead, I propose an...
In this chapter, we will deal with cluttering issues associated with the visualization of a high number of icons, representing Points of Interest, on mobile maps. Clutter is a frequently occuring problem that makes it difficult to understand the visualization and has the even more critical effect of masking data. As the user zooms out, the positions of icons increasingly converge until they par...
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