Utilization of Photosynth Point Clouds for 3D Object Reconstruction

ABSTRACT

There is a growing demand in modeling amorphous shapes like statues, figurine or monuments for computer visualization and documentation. Using photographs as the data source is a most convenient recording mode on site. The equipment is easy to handle and transportation is in no case a problem as it can occur if a laser scanning device has to be employed.

A photograph is a container of high information density. It carries radiometric information and can provide range values as well. In terms of computer vision, structure from motion is a process to find the correspondence between images. Features must be tracked from one image to the next. The 3D positions of the feature points and the camera movement is the result of the registration process. In the cultural heritage community the Epoch ARC 3D Web service is in common use. Linked with the open source tool MeshLab it provides an automated workflow including object reconstruction, mesh processing and textured rendering.

Recent developments from Microsoft introduce photo browsing. The Web community can view images from cities in Virtual Earth and participate with own objects applying Photosynth. Photosynth is designed as an image browser for objects, documented by internet imagery. The user navigates through a bundle of images representing the object. A smooth transition from one photo to the next is leading to the impression of a 3D model. Photo positions are known as well as a point cloud emerged from the registration process.

Applying a network protocol analyzer provides the location of the binary point cloud files. A Python script affords conversion into common CAD formats like PLY or DXF. Producing a low level polygon mesh for real time visualization exacts selecting the points of interest and mesh processing. The latter task will be solved applying MeshLab. It has to be mentioned, that the focus in this context points more on that low level polygon model instead of a high accurate and high density model. Furthermore Blender with its comfortable function for UV texture mapping and export script to X3D will be applicable to construct a complete 3D scene. This contribution introduces a 3D object reconstruction method from a series of photographs processed with Web tools and open source software.

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Rover technology

ABSTRACT

Location-aware computing involves the automatic tailoring of information and services based on the current location of the user. We have designed and implemented Rover, a system that enables location-based services, as well as the traditional time-aware, user-aware and device-aware services. To achieve system scalability to very large client sets, Rover servers are implemented in an “action-based” concurrent software architecture that enables fine-grained application-specific scheduling of tasks. We have demonstrated feasibility through implementations for both outdoor and indoor environments on multiple platforms. The intriguing aspect of this scenario is the automatic tailoring of information and services based on the current location of the user. We refer to this paradigm as location-aware computing.

The different technology components needed to realize location-aware computing are present today, powered by the increasing capabilities of mobile personal computing devices and the increasing deployment of wireless connectivity (IEEE 802.11 wireless LANs [7], Bluetooth [1], Infra-red [2], Cellular services, etc.). Location-aware, in addition to the more traditional notions of time-aware, user-aware, and device-aware. Rover has a location service that can track the location of every user, either by automated location determination technology (for example, using signal strength or time difference) or by the user manually entering current location (for example, by clicking on a map).

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Zone Based Ant Colony Routing In MANET

ABSTRACT

Ant colony optimization (ACO) is a stochastic approach for solving combinatorial optimization problems like routing in computer networks. The idea of this optimization is based on the food accumulation methodology of the ant community. Position based routing algorithms (POSANT) had some significant loopholes to find route like it never guarantees the route would be the shortest one, in cases while it is able to find it. The routing algorithms which are based on ant colony optimization find routing paths that are close in length to the shortest paths. The drawback of these algorithms is the large number of control messages that needs to be sent or the long delay before the routes are established from a source to a destination.This paper presents a new routing algorithm for mobile ad hoc network by combining the concept of Ant Colony approach and Zone based routing approach using clustering to get shortest path with small number of control messages to minimize the overhead. Also this shows that zone based ant colony routing algorithm using cluster is more efficient than POSANT routing algorithm by comparative Overhead study of POSANT and Zone based Ant using clustering concept with respect to varying Node Number, Zone Size and Mobility.

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Visions of 4G

ABSTRACT

As the virtual centre of excellence in mobile and personal communications (Mobile VCE) moves into its second core research programme it has been decided to set up a fourth generation (4G) visions group aimed at harmonising the research work across the work areas and amongst the numerous researchers working on the programme. This paper outlines the initial work of the group and provides a start to what will become an evolving vision of 4G. A short history of previous generations of mobile communications systems and a discussion of the limitations of third generation (3G) systems are followed by a vision of 4G for 2010 based on five elements: fully converged services, ubiquitous mobile access, diverse user devices, autonomous networks and software dependency. This vision is developed in more detail from a technology viewpoint into the key areas of networks and services, software systems and wireless access.

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Tripwire

ABSTRACT

Tripwire is an intrusion detection system. It is a software tool that checks to see what has changed on your system. The program monitors the key attributes of files that should not change, including the size, binary signature, expected change of size, and other related important datas. Tripwire is an open source program created to monitor changes in a key subset of files identified by the user and report on any changes in any of those files. When changes are detected the system Administrator can determine whether those changes occurred due to normal, permitted activity, or whether they were caused by a breakin. If the former, the administrator can update the system baseline to the new files. If the latter, then repair and recovery activity begins. Tripwire’s principle is simple enough. The system administrator identifies key files and causes Tripwire to record checksum for those files. Administrator also puts a cron job to scan those files at intervals(daily or more frequently), comparing to the original checksum. Any changes, addition, or deletion are reported, so the proper action can be taken.

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Honeypots

ABSTRACT

Honeypot is an exciting new technology with enormous potential for the security community. It is resource which is intended to be attacked and compromised to gain more information about the attacker and his attack techniques.
They are a highly flexible tool that comes in many shapes and sizes. This paper deals with understanding what a honeypot actually is ,and how it works.
There are different varieties of honeypots. Based on their category they have different applications. This paper gives an insight into the use of honeypots in productive as well as educative environments.
This paper also discusses the advantages and disadvantages of honeypots , and what the future hold in store for them.

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Security Challenge and Defense in VoIP Infrastructures

ABSTRACT

Voice over Internet Protocol (VoIP) has become a popular alternative to traditional public-switched telephone network (PSTN) networks that provides advantages of low cost and flexible advanced “digital” features. The flexibility of the VoIP system and the convergence of voice and data networks brings with it additional security risks. These are in addition to the common security concerns faced by the underlying IP data network facilities that a VoIP system relies on. The result being that the VoIP network further complicates the security assurance mission faced by enterprises employing this technology. It is time to document various security issues that a VoIP infrastructure may face and analyze the challenges and solutions that may guide future research and development efforts. In this paper, we examine and investigate the concerns and requirements of VoIP security. After a thorough review of security issues and defense mechanisms, we focus on attacks and countermeasures unique to VoIP systems that are essential for current and future VoIP implantations. Then, we analyze two popular industry best practices for securing VoIP networks and conclude this paper with further discussion on future research directions. This paper aims to direct future research efforts and to offer helpful guidelines for practitioners.

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