نتایج جستجو برای: ridge detection

تعداد نتایج: 581625  

2010
Ramon Egli Amy P. Chen Michael Winklhofer Kenneth P. Kodama Chorng-Shern Horng

[1] We present a highly sensitive and accurate method for quantitative detection and characterization of noninteracting or weakly interacting uniaxial single domain particles (UNISD) in rocks and sediments. The method is based on high-resolution measurements of first-order reversal curves (FORCs). UNISD particles have a unique FORC signature that can be used to isolate their contribution among ...

2012
Semra Türkan

The detection of influential observations has attracted a great deal of attention in last few decades. Most of the ideas of determining influential observations are based on single-case diagnostics with ith case deleted. The Cook’s distance are most commonly used among the other single-case diagnostics and successfully applied to various statistical models. In this article, we propose Cook’s di...

2007
Vera Schlindwein Christian Müller Wilfried Jokat

S U M M A R Y The active mid-ocean ridge of the Arctic Ocean, named Gakkel ridge, is the slowest spreading ridge of the global system of mid-oceanic ridges with full spreading rates declining from about 12.5 to 6 mm yr−1 from west to east. Geological models of seafloor spreading predict a decreasing intensity of magmatic processes with decreasing spreading rate. In summer 2001, the multidiscipl...

Journal: :J. Electronic Imaging 2005
Desikachari Nadadur Robert M. Haralick David E. Gustafson

In this paper, we discuss a unified theory for and performance evaluation of the ridge direction estimation through the minimization of the integral of the second directional derivative of the gray-level intensity function. The primary emphasis of this paper is on the ridge orientation estimation. The subsequent ridge detection can be performed using the traditional methods of using the zero cr...

A Kiakojouri, B Amooian, M Haji Ahmadi, M Seyyed Majidi,

  Objective: Alveolar ridge preservation in patients with inadequate bone volume is one treatment option for successful implant placement and can be done by using bone graft materials. On the other hand, Ceno Bone has been recently produced by Hamanand Saz Baft Kish Co. as a bone bioimplant of allograft origin. This study aimed to assess the clinical, histologic and histomorphometric results of...

1994
Wen L. Hwang

We present a couple of new algorithmic procedures for the detection of ridges in the modulus of the (continuous) wavelet transform of one-dimensional signals. These detection procedures are shown to be robust to additive white noise. We also derive and test a new reconstruction procedure. The latter uses only information from the restriction of the wavelet transform to a sample of points from t...

Journal: :journal of sciences, islamic republic of iran 2015
f. ghapani a. r. rasekh m. r. akhoond b. babadi

the aim of this paper is to propose some diagnostic methods in linear ridge measurement error models with stochastic linear restrictions using the corrected likelihood. based on the bias-corrected estimation of model parameters, diagnostic measures are developed to identify outlying and influential observations. in addition, we derive the corrected score test statistic for outliers detection ba...

1996
T. C. Parr S. M. Astley C. J. Taylor C.R.M. Boggis

Computer-based analysis of digitised x-ray mammograms enables the automatic detection of subtle signs of cancer. These include stellate lesions and architectural distortions, both of which are characterised by patterns of linear structures. The automated detection of such lesions in digitised mammograms is a challenging task due mainly to the similarity between the lesions and other naturally o...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
حسین بهنیا hossein behnia dental school, shaheed beheshti university of medical sciences, tehran -iran ([email protected])دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی علیرضا هادی alireza hadi

background & aim: dental implants should be surrounded with at least 1mm bone. assessing ridge width is an important part to achieve this goal. the use of ridge mapping to assess bone levels available avoids some of the problems associated with ct-scanning. the aim of this study was to assess the accuracy of ridge-mapping compared to ct-scan in determination of bony ridge widths. methods & mate...

A. R. Rasekh B. Babadi F. Ghapani M. R. Akhoond

The aim of this paper is to propose some diagnostic methods in linear ridge measurement error models with stochastic linear restrictions using the corrected likelihood. Based on the bias-corrected estimation of model parameters, diagnostic measures are developed to identify outlying and influential observations. In addition, we derive the corrected score test statistic for outliers detection ba...

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