نتایج جستجو برای: polar map

تعداد نتایج: 238904  

1994
Magued Bishay Richard Alan Peters Kazuhiko Kawamura

In this paper a system that successfully detects stationary objects in indoor scenes is presented. The doors and ceiling lamps have been chosen to be detected in the initial phase of our system. The scene was divided into four diierent regions. The edges resulting from the walls/ceiling and the walls//oor intersections are the boundaries that separate the diierent regions. The use of the log-po...

2006
Roland Hildebrand

Let Ln be the n-dimensional second order cone. A linear map from Rm to Rn is called positive if the image of Lm under this map is contained in Ln. For any pair (n,m) of dimensions, the set of positive maps forms a convex cone. We construct a linear matrix inequality (LMI) that describes this cone. Namely, we show that its dual cone, the cone of Lorentz-Lorentz separable elements, is a section o...

2007
Serguei Sokolov Stephen R. Rintoul

[1] We reexamine the relationship between circulation, bathymetry, and surface chlorophyll in the Southern Ocean, using new high-resolution maps of the frontal structure of the Antarctic Circumpolar Current (ACC) derived from satellite altimetry. The maps reveal that the ACC consists of multiple filaments or jets. By averaging surface chlorophyll measurements along streamlines, we show that the...

2002
Juan–Pablo Ortega

We generalize various symplectic reduction techniques of Marsden, Weinstein, Sjamaar, Bates, Lerman, Marle, Kazhdan, Kostant, and Sternberg to the context of the optimal momentum map. We see that, even though all those reduction procedures had been designed to deal with canonical actions on symplectic manifolds in the presence of a momentum map, our construction allows the construction of sympl...

2006
Claudia Crocco

In this paper the relation between prosodic form and meaning is investigated in a sample of polar questions in Neapolitan Italian, taken from four Map Task dialogues. The sample is analyzed from both the informational and the prosodic point of view. The analysis of the information structure led to the constitution of four groups of questions which are distinguished by their function or by the d...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه لرستان - دانشکده کشاورزی 1393

ارتعاشات ناشی از حمل و نقل می تواند بر ویژگی های پس از برداشت محصولات کشاورزی موثر باشد، اما در این مورد تاکنون مطالعه ای بر روی گل های بریده صورت نگرفته است. برای بررسی اثر ارتعاش بر عمر گل بریده و برخی ویژگی های پس از برداشت گل بریده رز، سه آزمایش انجام شد. در آزمایش اول اثر ارتعاش شبیه سازی شده حمل و نقل با دو فرکانس (7/5 و 10 هرتز)، سه موقعیت گل بریده روی مخزن (کف، وسط و بالا) و دو زمان ارت...

Journal: :Neurocomputing 2011
Yang Xu Lu Xu Tommy W. S. Chow

A new Self-Organizing Map algorithm, called the probabilistic polar self-organizing map (PPoSOM), is proposed. PPoSOM is a new variant of PolSOM, which is constructed on 2-D polar coordinates. Two variables: radius and angle are used to reflect the data characteristics. PPoSOM, developed to enhance the visualization performance, provides more data characteristics compared with the traditional m...

2009
Francesca Bovolo Silvia Marchesi Lorenzo Bruzzone

This paper presents an automatic context-sensitive technique robust to registration noise (RN) for change detection (CD) in multitemporal very high geometrical resolution (VHR) remote-sensing images. Exploiting the properties of RN in VHR images, the proposed technique analyzes the distribution of the spectral change vectors (SCVs) computed according to the change vector analysis in an adaptive...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد 1388

یکی از مسائلی که در سیستم sar مطرح می شود مسأله نویز speckle می باشد. منبع تولید نویز speckle فاز نسبی پراکنده گرهای مختلف در یک سلول رادار می باشد که نوسانات شدیدی در سیگنال دریافتی به وجود آورده و تصویر حاصل را دانه دانه می نماید. این نویز تفسیر تصاویر را مشکل و اطلاعات زیادی را مخفی می کند و لذا کاهش آن یکی از ملزومات در پردازش سیگنال sar است. الگوریتمهای متعددی جهت کاهش نویز speckle در نوا...

Journal: :IEEE Trans. Pattern Anal. Mach. Intell. 1997
Giorgio Bonmassar Eric L. Schwartz

Space-variant sensing is the architectural basis of all higher vertebrate visual systems (Schwartz, 1994). One evident motivation for this is that the spacecomplexity of the human visual system is reduced by up to four orders of magnitude (Rojer and Schwartz, 1990) via the use of space-variant architecture (jar a given ratio of field width to maximum resolution). This observation has obvious pr...

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