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Background subtraction and optical flow - ...namic surface textures that incorporate such timevarying details. The multiple video streams are recorded in our studio by cameras providing high fram...
The camera model and similar techniques - ... we briefly describe the process of camera calibration and the imaging geometry of stereo cameras. Although the projects in this article are usually t...
Visual computing and its research areas - ...uli. Visual perception is not only a tool for us but it can also induce great emotions, for instance if we are looking at a painting we like, or when ...
Editing methods in computer graphics - ...eproduce correct deformation results if only a small number of constraints is used. Some approaches propose to solve the computationally expensive non...
The guided poisson based method - ...perators Gj , for each triangle t j , Poisson-based methods are able to derive a novel surface mesh M that matches the deformed gradient field subject...
The iterative volumetric laplacian method - ...itional constraints pcj for nc selected vertices. This method infers rotational constraints from the given positional constraints and also improves th...
Associative arrays in Python are dictionaries - ...than the corresponding examples for other built-in data structures. If you've never used associative arrays or hash tables in other languages, then a ...
What can be used as a key in Python - ... variable x is holding the number 3, and you assign 4 to x, you've changed the value in x, but you haven't changed the number 3; 3 is still 3. Strings...
Definitions and uses of functions in Python - ...cstring. You can obtain its value by printing fact.__doc__. The intention of docstrings is to describe the external behavior of a function and the par...
Python functions handle variable numbers of arguments - ... named parameter in the function parameter list, into a dictionary. These two mechanisms are discussed next. Prefixing the final parameter name of the...
Lambda expressions and generator functions in Python - ... be awkward to have to define the function in a separate place from where it's used. This defines lambda expressions as values of the dictionary. Note...
How to create a basic program in Python - ...input and output. If you're from a Windows or Mac background, these things may be new to you, and you may be more inclined to question their value. It...
How to make Python script execution in UNIX and Mac OS X and in Windows - ...irectory), you can execute it regardless of the directory you're in by typing its name and the desired arguments. On UNIX, you'll have input and outpu...
The difference between scripts on Windows scripts on UNIX - ...red directory and call this with wildcards and output redirection. This UNIX shell will find all files in the current directory that start with sole a...
Python applications are distributed as source files - ...beyond the scope of this article, but if you want to package and distribute your Python code, the documentation on the python.org website has an exten...
How to use the Python file system - ...to simplify cross-platform filesystem interaction- but I wouldn't recommend it. Instead, read at least the first part of this article. This will give ...
Client complaints about inconsistent query results - ...ma?" You then start looking at the data model and the tables seem wonderfully designed. Your query should work. Dang, now what? You dig deeper, and re...
How to ensure data quality - ...our tongue in a lamp socket, but I guarantee you it's a bad idea unless you want to say hi to your cat that your mother told you was "sent off to live...
How to use a foreign key constraint - ...don't take the time to add the foreign key constraint, then the value for order- Number in the orderItem table isn't bound to any domain of values. It...
Triggers in SQL Server programming - ... fill gaps left by constraints by allowing you to handle problems that constraints are incapable of and have the solution automatically occur without ...
How to apply the tools to common situations - ...akes will often be made. There are too many clients and too many situations to guarantee perfection in the object layers that are created. Having this...
Communication between domain experts and data modelers - ...rmalizing-when you try to find all the functional dependencies. Considering how exact and well laid down the rules of normalization are, it's surprisi...
How to model the sales order - ...g a simple and recognizable example enables you to check my questions and the answers provided by the fictitious domain expert, and to see for yoursel...
Where does an attribute depend on one of the other attributes - ...ttributes on your shortlist-one of the hardest problems to overcome in data modeling. The method for finding multiattribute dependencies is the same a...
A few lines about database development - ...is no longer just a simple SQL database system; it has become an application platform, a vehicle for the creation of complex and multifaceted data sol...
Iterative code and set based iteration - ...ecord until the end of the file has been reached. SQL Server has cursors as a built-in mechanism for this iteration, hence the term cursor-based code ...
XML definition and basics - ...hat consists of textual annotations, or markup tags, that control the structure or display of textual data. XML allows you to create your own custom m...
What is the prolog of an XML document - ...ier. The version number indicates the version of the W3C XML recommendation that your XML document conforms to. The prolog can also include an encodin...
Explanations to the XML data type - ...converts it to an internal binary representation based on the XQuery/XPath Data Model (XDM) recommendation. The XDM recommendation defines a hierarchi...
How to understand full text search - ...as containers to organize our indexes. Each word in a full-text index also includes a unique key for that record. You should note that in order to ful...
How to shred XML data and specify a namespace in XQuery - ...alues. As you can see, the .nodes() method has to be aliased with both a table name and a column name. In this case, we used the alias Tab(Col) for si...
A few words on the simil algorithm - ... In one example, a company had a table with organic chemistry compounds, and their names were sometimes spelled differently. The application presents ...
Indexes can help access data quickly and effectively - ...sed. Hopefully this won't leave you too disheartened about the idea of researching your indexes but instead convince you of the power of SQL Server. M...
What is a deadlock error in SQL server - ...n exactly what happened to cause a deadlock and, with that information, in most cases it's possible to fix the root cause and prevent the error comple...
The tempdb database is used as a shared temporary workspace - ...porary work tables used for hash joins, aggregations, cursors, and spool operations, and temporarily storing large objects; storing intermediate sort ...
Embedded Linux is used for some very good commercial reasons - ...ou’ll have greater control over a critical aspect of your development project. Complete Software Ecosystem The universe of s...
Linux and its memory management system - ...cessor that performs this translation is the memory management unit (MMU). When a process requests memory, the CPU looks up the address in a table p...

Latest "Tutorials and Guides" Articles


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New consumer journey in the advertising industry (04/20/2010)
(...) Making advertising an all-encompassing activity was an approach pioneered by automotive and telecommunications services – as some of the case studies in this book demonstrate. In particular, by shaping customer services with advertising techniques, brands have been able to use every bit of one-to-one customer dialogue as an opportunity to develop the user experience, which itself is an advertisement to stick with a brand. This makes for more effective returns on advertising investment. (...)
Modeling humans and shapes (12/14/2009)
(...) The epipolar geometry of a stereo pair is fully-specified by its fundamental matrix. The fundamental matrix can be inferred from eight point correspondences between two uncalibrated cameras, and it is directly available for fully-calibrated camera pairs. By using the fundamental matrix and the epipolar line, image correspondences can be computed using simple matrix multiplications, which reduces the problem to an one-dimensional search space along a line. (...)
Background subtraction and optical flow (12/14/2009)
(...) The translational components of the rigid body transformations are implicitly represented by the bone lengths and the joints model the rotational components. Since the bone lengths are constant, the pose of the skeleton is fully-specified by the rotation parameters for each joint and an additional translational parameter for the root. A method to robustly segment a person in the foreground of a scene from the background is necessary. (...)
The camera model and similar techniques (12/14/2009)
(...) In the following, we will describe the mathematical framework formapping the 3D world space to the 2D image plane, the process of camera calibration and the geometry of stereo cameras. The matrix K can be referred to as the calibration matrix and its entries are called the intrinsic parameters of the camera. The principal point in the image plane is at position at the intersection of the optical axis with the image plane. (...)
Visual computing and its research areas (12/14/2009)
(...) However, if we compare the performance, robustness and application range of even the best computer vision system today to the abilities of the human visual system, we have to humbly conclude that the field of computer vision is still in its infancy. While computer vision focuses on the functional or reconstruction side of visual computing, computer graphics focuses on the synthesis or display aspect. In recent years algorithms for creating photo-realistic virtual imagery have greatly improved. (...)
Interactive shape deformation (12/14/2009)
(...) Instead of directly modify the spatial location of each vertex in the model, they use a local differential representation of the shape, which encodes information about its local shape and the size and orientation of the local details, to obtain a detail-preserving deformation result. Deformation is performed by constructing a differential representation of the shape, manipulating it according to the given constraints, and finally reconstructing the shape from the modified differential representation.While sharing the same general framework, the two main categories of differential techniques differ by the particular representation they use. (...)
Editing methods in computer graphics (12/14/2009)
(...) While these approaches are an effective tool for enhancing fine-scale detail preservation, the generation of the hierarchy can be expensive for complex models. Moreover, it is hard to deal with large deformations in a single step. These limitations are the main reason for differential-based deformation approaches, which represent the model using its local differential coordinates instead of using its spatial coordinates. (...)
The guided poisson based method (12/14/2009)
(...) This construction allows us to manipulate M by applying the user constraints as separate transformations. At the end, we can reconstruct M in its new target configuration by computing the new vertex positions p such that the resulting mesh complies with the new, rotated gradients. This can be computed by solving the Poisson system Lsp, which is formulated as a least-squares system for each x, y and z-coordinate separately. (...)
The iterative volumetric laplacian method (12/14/2009)
(...) The approach starts by constructing the tetrahedral Laplacian system where G is the discrete gradient operator matrix for the volumetric model, D is a 4mt 4mt diagonal matrix containing the tetrahedra's volumes, g is the set of tetrahedron gradients, each being calculated as gj = Gj pj, and pj is a matrix containing the vertex coordinates of tetrahedron tt j . The constraints pcj can be factorized into the matrix Ls by eliminating the corresponding rows and columns in the matrix and incorporating the values into the right-hand side. By solving the previous tetrahedral Laplacian system, we obtain a set of new vertex positions V. (...)

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