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Newport 900 Three Axis Spatial Filter Optics Optical Assembly laser VERY NICE |  |
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US $499.98 | 28d 14h 8m |
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nLine Corp. SPATIAL FILTER LENS 10mm DIA Nice | |
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US $35.00 | 20d 13h 25m |
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Newport 900 Three-Axis Spatial Filter with 20x Objective and 900PH-50 | |
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US $379.95 | 19d 13h 23m |
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Tropel Laser Collimator 280 with Spatial Filter 261 | |
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US $850.00 | 18d 13h 46m |
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Spatial Filter Movement With Standard Spatial Filter System EFL 8.00 Objective | |
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US $499.00 | 15d 6h 55m |
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Spatial Filter Movement With Standard Spatial Filter System 40X Objective | |
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US $499.00 | 15d 6h 21m |
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Newport 900 Laser Spatial Filter 3-Axis with 60X Objective Lens 3X Micrometer | |
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US $424.99 | 5d 17h 20m |
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Newport M-900 3-Axis Spatial Filter, 561D-YZ Fiber Alignment Stage & 561-TILT-LH | |
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US $785.95 | 13h 46m |
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Spatial Filter
Optical Spatial Filtering Problem. Not sure what equation to use.?
A grating of the spatial frequency 80 lines/mm is used as the object of an optical processor. A high pass filter is inserted in the FTP of the processor, so that it removes the DC, the first order diffraction of the FT - spect of the grating. Upon the recombination of the image, a new pattern of lines were obtained at the image plane of the processor. What is the spatial frequency of the pattern? What is the spacing between lines?
The Fourier transform would be a series of dots (actually elongated dots), the brightest in the middle and getting exponentially dimmer as you go out. Removing the DC component and the first harmonic would be removing the center dot and the two next to it. If you removed the 1st, 3rd, 5th... harmonic you would simply have half the frequency. But since you're leaving all that behind you're still going to have some of the fundamental frequency left behind. I think, and I'm not 100% sure of this, the effect would just be a general blurring of the lines. You may want to check on this though, it's been a long time since I had optics. If you have access to an optics lab you can try it and see. That being the case you would keep the same frequency of 80 lines/mm or 1/80 mm between lines.
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No items matching your keywords were found.
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Newport 900 Three Axis Spatial Filter Optics Optical Assembly laser VERY NICE | |
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US $499.98 | 28d 14h 8m |
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nLine Corp. SPATIAL FILTER LENS 10mm DIA Nice | |
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US $35.00 | 20d 13h 25m |
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Newport 900 Three-Axis Spatial Filter with 20x Objective and 900PH-50 | |
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US $379.95 | 19d 13h 23m |
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Tropel Laser Collimator 280 with Spatial Filter 261 | |
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US $850.00 | 18d 13h 46m |
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Spatial Filter Movement With Standard Spatial Filter System EFL 8.00 Objective | |
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US $499.00 | 15d 6h 55m |
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Spatial Filter Movement With Standard Spatial Filter System 40X Objective | |
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US $499.00 | 15d 6h 21m |
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Newport 900 Laser Spatial Filter 3-Axis with 60X Objective Lens 3X Micrometer | |
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US $424.99 | 5d 17h 20m |
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Newport M-900 3-Axis Spatial Filter, 561D-YZ Fiber Alignment Stage & 561-TILT-LH | |
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US $785.95 | 13h 46m |
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Newport Optics 900: Spatial Filter 3-Axis Adjustable Stage w/ Micrometers | |
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US $285.00 | 19d 13h 3m |
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Adaptive Spatial Filters for Electromagnetic Brain Imaging by Kensuke... | |
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US $200.20 | 29d 11h 13m |
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Newport 900 Three Axis Spatial Filter Optics Optical Assembly laser VERY NICE | |
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US $499.98 | 28d 14h 8m |
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Adaptive Spatial Filters for Electromagnetic Brain Imag | |
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US $225.31 | 22d 23h 23m |
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Gaertner Scientific R250F Spatial Filter Assembly | |
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US $352.00 | 22d 8h 26m |
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nLine Corp. SPATIAL FILTER LENS 10mm DIA Nice | |
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US $35.00 | 20d 13h 25m |
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Newport 900 Three-Axis Spatial Filter with 20x Objective and 900PH-50 | |
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US $379.95 | 19d 13h 23m |
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Newport Optics 900: Spatial Filter 3-Axis Adjustable Stage w/ Micrometers | |
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US $285.00 | 19d 13h 3m |
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Tropel Laser Collimator 280 with Spatial Filter 261 | |
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US $850.00 | 18d 13h 46m |
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Spatial Filter Movement With Standard Spatial Filter System EFL 8.00 Objective | |
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US $499.00 | 15d 6h 55m |
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Spatial Filter Movement With Standard Spatial Filter System 40X Objective | |
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US $499.00 | 15d 6h 21m |
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Spatial Stasis $22.99 Spatial Stasis |
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Spatial Frequency $70.1 High Quality Content by WIKIPEDIA articles In mathematics, physics, and engineering, spatial frequency is a characteristic of any structure that is periodic across position in space. The spatial frequency is a measure of how often the structure repeats per unit of distance. The SI unit of spatial frequency is cycles per meter. In image processing applications, the spatial frequency often is measured as lines per millimeter, which is 1000 times smaller than the SI unit. In the study of visual perception, sinusoidal gratings (images containing bands of white and black in a regular pattern) are frequently used to probe the capabilities of the visual system. In these stimuli, spatial frequency is expressed as the number of cycles per degree of visual angle. Different spatial frequencies convey different information about the appearance of a stimulus. High spatial frequencies represent abrupt spatial changes in the image, such as edges, and generally correspond to configural information and fine detail. Low spatial frequencies, on the other hand, represent global information about the shape, such as general orientation and proportions. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 94 Publication Date: 2010/08/12 Language: English Dimensions: 6.00 x 9.02 x 0.23 inches |
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Spatial Econometrics $66.91 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Spatial Econometrics is the field where spatial analysis and econometrics intersect. In general, econometrics differs from other branches of statistics in focusing on theoretical models, whose parameters are estimated using regression analysis. Spatial econometrics is a refinement of this, where either the theoretical model involves interactions between different entities, or the data observations are not truly independent. Thus, models incorporating spatial autocorrelation or neighborhood effects can be estimated using spatial econometric methods. Such models are common in regional science, real estate economics, and education economics. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 60 Publication Date: 2011/07/03 Language: English Dimensions: 9.02 x 5.98 x 0.14 inches |
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European Spatial Planning and Territorial Cooperation $40.92 European Spatial Planning and Territorial Cooperation |
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Spatial Variability $78.07 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Spatial variability occurs when a quantity that is measured at different spatial locations exhibits values that differ across the locations. Spatial variability can be assessed using spatial descriptive statistics such as the range. Descriptive statistics describe the main features of a collection of data quantitatively. Descriptive statistics are distinguished from inferential statistics (or inductive statistics), in that descriptive statistics aim to summarize a data set, rather than use the data to learn about the population that the data are thought to represent. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 18 Publication Date: 2011/07/03 Language: English Dimensions: 9.02 x 5.98 x 0.04 inches |
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Spatial Network $60.54 High Quality Content by WIKIPEDIA articles A spatial network is a network of spatial elements. In physical space (which typically includes urban or building space) spatial networks are derived from maps of open space within the urban context or building. One might think of the space map as being the negative image of the standard map, with the open space cut out of the background buildings or walls. The space map is then broken into units; most simply, these might be road segments. The road segments (the nodes of the graph) can be linked into a network via their intersections (the edges of a graph). A common instance of a spatial network, the transportation network analysis, reverses this and treats the road segments as edges and the street intersections as nodes in the graph. More generally, the term spatial network has come to be used to describe any network in which the links (or potential links) between nodes are constrained by the location of the nodes in some kind of space. In this situation the topology of the network can be considered exogenous to the model. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 74 Publication Date: 2010/08/12 Language: English Dimensions: 6.00 x 9.02 x 0.18 inches |
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Spatial Bifurcation $66.91 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Spatial bifurcation is a form of bifurcation theory. The classic bifurcation analysis is referred to as an ordinary differential equation system, which is independent on the spatial variables. However, most realistic systems are spatially dependent. In order to understand spatial variable system (partial differential equations), some scientists try to treat with the spatial variable as time and use the AUTO package get a bifurcation results. The weak nonlinear analysis will not provide substantial insights into the nonlinear problem of pattern selection. To understand the pattern selection mechanism, we exploit first the method of spatial dynamics, which was found to be an effective method exploring the multiplicity of steady state solutions. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 60 Publication Date: 2011/07/02 Language: English Dimensions: 9.02 x 5.98 x 0.14 inches |
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Spatial Vision $150.93 This volume presents an integrated view of how we perceive the spatial relations in our visual world, covering anatomical, physiological, psychophysical, and perceptual aspects. The authors discuss the visual system primarily in terms of spatial frequency analysis using a linear systems approach. They review evidence supporting a local, patchbypatch spatial frequency filtering of visual information rather than the global Fourier analysis other researchers have proposed. A separate chapter addresses the special issues surrounding color vision, and a brief, nonmathematical introduction to linear systems analysis is included for the uninitiated reader. Author: De Valois, Russell L./ de Valois, Karen K. Series Title: Oxford Psychology Series: No. 14 Binding Type: Paperback Number of Pages: 402 Publication Date: 1990/08/09 Language: English Dimensions: 9.12 x 6.10 x 1.02 inches |
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Spatial Analytical $124.18 The ability to manipulate spatial data in different forms and to extract additional meaning from them is at the heart of GIS, yet genuine spatial analysis tools are rarely incorporated into commercial software, thus seriously limiting their usefulness. The future of GIS technology wil depend largely on the incorporation of more powerful analytical and modelling functions and there is agreement within the GIS community of the urgent need to address these issues. This text attempts this task. It presents the latest information on incorporating spatial analysis tools into GIS, and includes concepts and applications from both the environmental and socioeconimc sciences. Author: Fischer, Fischer M./ Fischer, Manfred M./ Fischer, Manfred M. Series Title: GISDATA Series Number: 4 Binding Type: Paperback Number of Pages: 267 Publication Date: 1996/12/01 Language: English Dimensions: 9.67 x 6.64 x 0.66 inches |
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Telescope Spatial $81.25 High Quality Content by WIKIPEDIA articles Un telescope spatial est un telescope place au dela de latmosphere. Le telescope spatial presente lavantage par rapport a son homologue terrestre de ne pas etre perturbe par latmosphere terrestre. Celleci deforme le rayonnement lumineux dans le visible. Les progres de lastronautique ont permis a compter des annees 1960 denvoyer dans lespace des telescopes spatiaux de differents types dont le plus connu est le telescope spatial Hubble. Ces instruments jouent desormais un role important dans la collecte dinformation sur les etoiles, les galaxies, les planetes eloignees et les autres objets celestes. Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 110 Publication Date: 2010/08/03 Language: French Dimensions: 6.00 x 9.02 x 0.26 inches |
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Spatial Representation and Spatial Interaction $103.35 No Synopsis Available |
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Spatial Neglect $95.51 Spatial neglect is a profound clinical problem as well as intriguing scientific problem. In the last ten years, there has been an explosion of interest in this disorder, which as a result is no longer viewed as a single entity, but rather as a number of different disorders. This book is an attempt to bring the reader up to date with the latest advances in understanding neglect, at least insofar as this contributes to better clinical assessment, management and treatment. This is not a book for the specialist researcher in the neuropsychology of neglect and attention. Rather, it is a book aimed at clinicians student and trained from all disciplines involved in the assessment, management and treatment of neglect.The book begins with the description of four cases manifesting different types of unilateral neglect. The reader is introduced to different aspects of neglect through these patients. These distinctions include those between personal and extrapersonal neglect, motor versus sensory neglect and many others. The reader is also introduced to other phenomena that are closely related to neglect, including ansognosia and impaired sustained attention. The latest methodes of assessment of neglect are also described, as are methods of treatment, again with reference to the four introductory specimen cases. Author: Robertson, Ian H./ Robertson Ian, H./ Roberston, Lan H. Series Title: Brain, Behaviour and Cognition Binding Type: Paperback Number of Pages: 172 Publication Date: 2001/02/13 Language: English Dimensions: 9.18 x 6.54 x 0.36 inches |
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Spatial Methods in Econometrics $96.59 This work deals with the adequate handling of spatial data in general, and in particular in the framework of economic sciences. An overview of well known methods from the field of spatial statistics and spatial econometrics is given. Furthermore a special class of spatial objects is described, namely objects that are that far apart from all other observations in the dataset, that they are not connected to them anymore. Different treatments of such objects are suggested and their influence on the Morans I test for spatial autocorrelation is analysed. After this theoretical part some adequate spatial methods are applied to the wellknown problem of RD spillovers. Here the spatial contiguity matrix is based on an economic distance measure instead of the commonly used geographic distances. In the last part, optimal design theory and spatial analysis are combined via a new criterion, which was developed to be able to take a potential spatial dependency of the data points into account. The target audience for this book are statistics students and scientific researchers who are familiar with the standard tools for regression modelling, optimal design theory and statistical inference. Author: Gumprecht, Daniela Binding Type: Paperback Number of Pages: 100 Publication Date: 2008/04/01 Language: English Dimensions: 9.00 x 6.00 x 0.21 inches |
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A MultiRelational Approach to Spatial Classifiers $124.27 A spatial classifier is a model used to predict class labels for spatial entities based on their features, relationships to other entities and their corresponding features. One way to classify spatial data is to use a multirelational framework, by transforming the spatial problem into a multirelational one, and then applying existing methods. This transformation poses new problems. First, the spatial relationships are unknown, and the algorithm needs to determine which relationships and spatial features are important. Second, the effect of a single spatial entity is negligible when in the neighbourhood of thousands of other such entities, hence aggregation must be used. Third, properties of neighbourhoods, such as spatial trends, need to be described and used for classification purposes. Finally, the cost incurred in this transformation is not negligible, hence efficiency must be considered. This book addresses all of these problems with a novel spatial classifier called UnMASC. All of the modifications introduced with UnMASC in this book are explored theoretically and evaluated on a real live dataset. Author: Frank, Richard Binding Type: Paperback Number of Pages: 132 Publication Date: 2010/11/28 Language: English Dimensions: 6.00 x 9.02 x 0.31 inches |
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Spatial Relationship of Crop Yields $114.71 Systemic risk, in regard to agricultural production, refers to the spatial dependence of crop yields stemming from correlated weather, soil patterns, and other geographically related factors. Systemic risk has been named as a contributing factor to the Federal Crop Insurance Corporations (FCIC) poor actuarial performance. To date, little research has explored the spatial dependence structure of crop yields. This book explores three aspects of the spatial dependence structure of yields; the crosscrop spatial correlation structure, the rate of crop yield spatial correlation decay, and, using the copula methodology, the characteristics of the bivariate distributions that define the spatial relationship of crop yields. This book is addressed to professionals researching in the area of crop insurance. Author: Dirienzo, Cassandra Binding Type: Paperback Number of Pages: 148 Publication Date: 2008/01/01 Language: English Dimensions: 9.61 x 6.69 x 0.32 inches |
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Estimation of Spatial Panels $166.02 Spatial panel models have panel data structures to capture spatial interactions across spatial units and over time. There are static as well as dynamic models. Estimation of Spatial Panels provides some recent developments on the specification and estimation of such models. The first part considers estimation for static models. The second part is devoted to the estimation for spatial dynamic panels, where both stable and unstable dynamic models with fixed effects will be considered. The estimation methods are illustrated with two relevant empirical studies, one on regional growth and the other on market integration. Author: Lee, LungFei/ Yu, Jihai Binding Type: Paperback Number of Pages: 180 Publication Date: 2011/03/28 Language: English Dimensions: 6.14 x 9.21 x 0.38 inches |
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Attitudes Towards Spatial Privacy $176.84 Research findings suggest that privacy continues to be a serious concern in contemporary society, that spatial privacy is in fact a unique and measurable concept, and that concern for spatial privacy is measurably more significant than a similar metric of general privacy. Though spatial privacy did present as unique and measurable, the chosen demographic variables appeared to be much less significant than originally anticipated. The population continues to be concerned about a wide range of privacy issues. However, issues relating to privacy in a spatial context manifest as a greater concern than does a general privacy format. The continued growth of spatially aware technology and the wide distribution of these technologies to an ever increasing population have serious implication for spatial privacy as a continued issue. Author: Morgan, Larry Binding Type: Paperback Number of Pages: 372 Publication Date: 2009/06/01 Language: English Dimensions: 9.00 x 6.00 x 0.83 inches |
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Practical Handbook of Spatial Statistics $222.96 The guidance and special techniques provided in this handbook will allow you to understand and use complex spatial statistical techniques. You will learn how to apply proper spatial analysis techniques and why they are generally different from conventional statistical analyses. Clear and concise information on weighting, aggregation effects, sampling, spatial statistics and GIS, and visualization of spatial dependence is provided. Discussions on specific applications using actual data sets fill obvious gaps in the literature, and coverage of critical research frontiers allows readers to explore current areas of active research. Author: Arlinghaus, Sandra L./ Arlinghaus, Arlinghaus/ Arlinghaus, Sandra L. Binding Type: Hardcover Number of Pages: 336 Publication Date: 1995/10/05 Language: English Dimensions: 9.60 x 6.42 x 0.91 inches |
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Spatial Query Server $78.07 Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Boeing Companys Spatial Query Server is a commercially available product which enables a Sybase database to contain spatial features. Sybase Inc. is partnered with The Boeing Company who develops and licenses Spatial Query Server for Sybase. Spatial Query Server spatially enables a Sybase ASE Database. The Boeing Company is an American multinational aerospace and defense corporation, founded in 1916 by William E. Boeing in Seattle, Washington. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 76 Publication Date: 2011/07/03 Language: English Dimensions: 9.02 x 5.98 x 0.18 inches |
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Spatial Representation (Hardcover) $191.7 Our experience of the spatial world is a unitary one; we perceive objects and layouts, we remember them and act on them, and we can even talk about them with ease. Despite this impression of seamlessness, spatial representations in human adults appear to be specialized in domain-dependent manner, engaging different properties and computational mechanisms for different functions. In this book, the authors present evidence that this domain-specific specialization in cognitive function emerges early in development and is reflected in patterns of breakdown that occur under genetic defect. The authors focus on spatial representation in children and adults with Williams syndrome, a relatively rare genetic syndrome that gives rise to an unusual profile of severely impaired spatial representation together with spared language. Results from a variety of spatial domains -- including object representation, motion perception, action, navigation, and spatial language -- appear to display a strikingly uneven profile of sparing and deficit within spatial representations, consistent with the idea that specialization of function drives development and breakdown. These findings raise a crucial question: Can specific genes target specific aspects of cognitive structure? Looking deeper into the patterns of performance across spatial domains, the book explores the notion that understanding patterns of normal development across domains is crucial to understanding unusual development. Using insights from normal development, the authors propose a speculative hypothesis that explains the emergence of the William syndrome profile, and how complex cognitive outcomes can arise from the deletion of a small set of genes. |
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AutoCAD Map 3D - How To Apply a Spatial Filter to a Point Cloud
Seek help : Convert digital image to frequency domain using fft?
I am doing a thesis "Image Restoration using Inverse Filtering".
I am in the stage to convert digital image from spatial domain to
frequency domain using fft(fast fourier transform). I will program it
using c programming.
I have found fftw as a way to make the fft. However, I am not familiar
with fftw. I compare fft result from Matlab and fftw. They are totally
different.
Is there anyone have skills and experiences in digital image
processing? Thanks.
Hmm, I've used fftw in the past and it looked OK when testing with Matlab (i.e. fftw and Matlab gave the same results). I was only doing a 1-dimensional FFT though.
That's probably not much help, but without knowing more about what you are getting it's tricky to make suggestions (well, not without patronising you... I mean obviously try simple things first - e.g. 1-dimensional real-valued FFT on a sine wave - and compare that between FFTW and Matlab. Ideally load the FFTW answer in Matlab and plot the abs() of the two answers on the same graph)
Sorry, comments for this entry are closed at this time.