The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Pulsars emit broadband electromagnetic radiation, with an individual signature (period and shape), ranging from radio to X-ray and gamma-ray frequencies. For the purpose of navigation the pulsars of interest are fast rotating neutron stars that emit short stable periodic pulses, having periods between milliseconds and seconds. By detecting a set of known pulsars, it is possible to use them as beacons...
The identification of a writer of a handwriting image is very useful for applications in forensic and historic document analysis. Writer identification methods retrieve the closest image within a list of samples of different writers to a query sample. In automatic writer verification the system takes an automatic decision if two handwriting images were written by the same person. In recent years,...
Determining the centroids of circular marks is a problem that arises in many applications, for example, fluid mechanics, computer graphics, coordinate meteorology, statistics, etc. The accuracy of determining the centroids of circular marks in images is important for the overall accuracy of measurements. Therefore, the aim of the present work is to determine the centroids of these circular marks with...
In this paper, an improved pitch contour formulation is introduced by modifying the existing pitch contour sinusoidal function. The aim is to convert neutral speech into storytelling speech in Malay Language. Our speech datasets (neutral and storytelling speech) were recorded by a male and a female professional speaker. They contain 116 speech sentences, 1,164 words, and 2,732 syllables. For storytelling...
The ranging and positioning accuracy of an impulse radio (IR) 60 GHz system is investigated. The corresponding Cramér-Rao lower bound (CRLB) over an additive white Gaussian noise (AWGN) channel is analyzed. The signal parameters which may affect the accuracy are examined. Performance results over AWGN and indoor residential channels are presented. In particular, the indoor residential channel models...
The more digital image production increase, the more effectiveness and productivity of image recognition mechanism and comparison techniques become important. In this study, comparative experiments are made for distribution distance measurement function that is explained in the scope by using skeleton presentation which is obtained from 2D and 3D images of objects. Separate experiments are made in...
As computing systems become increasingly pervasive, the number of applications that can benefit from or require localization capabilities continuously increases. In indoor environments, wireless sensor networks are a common means to perform localization, trilateration being one of the most commonly used techniques. The placement of anchor nodes influences greatly the system performance and cost. This...
This paper introduces a Fresnel-like reflector antenna design producing high-order Orbital Angular Momentum states. This design is referred to as a Fresnel-like reflector because the typical surface discontinuity corresponding to the wrapped phase is only applied to the helical shaping and not to the basic parabolic shape so as to maintain broad band operation. This approach is found to provide stronger...
In the presence of multipath propagation received signals are composed of multiple echoes which are correlated to the direct signal. When using bandlimited signals for time-of-arrival (ToA) locating in indoor environments, the radio bandwidth is often not sufficient to decompose the received signal and to identify the first arriving path. This paper presents a ToA estimation approach based on a high-resolution...
The research is focused on depth evaluation using a single camera. 2D images can be used for finding the depth of a particular object in the image. Algorithm uses marker(s) to update its orientation and to compute the distance. Initially the shape of the marker is fixed and is pre-defined but as the research expands improvements will make the algorithm to work autonomously using everyday objects as...
The Distance Measuring Equipment (DME, DME/Normal) based navigation method known as DME/DME positioning has been proposed as one of the possible Alternative Position, Navigation, and Timing (APNT) services for aviation during the outage of the Global Navigation Satellite Systems. A DME interrogator measures the slant range to a DME transponder by means of the elapsed time in exchanging a pair of DME...
In the recent decades, short-range wireless has become of great importance in the applications of Intelligent Transportation Systems (ITS); especially, that serve traffic management and safety. Various approaches are concerned with optimal positioning of a vehicle and Base-Stations (BSs) placement within a specific area. The optimization problem stands as an exhaustive challenge. This paper discuses...
We present a nonparametric and efficient method for shape localization that improves on the traditional sub-window search in capturing the fine geometry of an object from a small number of feature points. Our method implies that the discrete set of features capture more appearance and shape information than is commonly exploited. We use the a-complex by Edelsbrunner et al. to build a filtration of...
A new text recognition algorithm is proposed based on Shape Context and Fuzzy inference to solve the corresponding problems. And the algorithm is used to improve accuracy and effectiveness of recognition. Then experiments results show that our proposed method is effective.
Mahalanobis, Jaccard and others are similarity measurements which are commonly used in sketch recognition. Attempts to improve similarity measurement can be made by manipulating formulae and reducing the testing data set used but less effort are attempted to propose algorithm. Hence, the purpose of this study is to propose a new algorithm for a better method in shape recognition. To do so, Mahalanobis...
This paper presents a work on fast robotic grasping by a mobile robot based on partial shape information of an object. The information is acquired by a laser range finder installed on the robot at an inclined angle. Feature data are extracted by scanning part of the object to calculate the grasping point. The robot grasps the object without needing to acquire and process all of the object information...
Gaussian mixture models with shifted delta ceptra features are known to provide high-performance language recognition. The performance of the models is typically assessed using measurements derived from detection estimation tradeoff (DET) curves, which is a costly process. This paper describes a new method for estimating Gaussian mixture model performance which reduces the need for the performance...
We present a method to aggregate and classify the 2D outline of arbitrary shaped objects from 3D-range data. As a mobile robot only captures a limited part of an object in a single measurement, the raw data of several measurements are combined to build a data set as comprehensive as possible. Doing so the classification uses all previous measurements. As the classification uses local curvature based...
Spatial scan statistic has been applied in many disease vector studies. However it rarely takes into account some relevant contextual information. As a result, the interpretation of the test results has been challenging and some interpretations could be misleading. In this study, a new technique to apply spatial scan statistic for the detection of local clusters in disease vectors is proposed. This...
The paper deals with the issue of action recognition as an application of the new 3D time-of-flight (ToF) camera, exploiting the special ability of the device to measure distances. Segmentation of moving people is straightforward from the distance information and subsequent steps of the processing chain follow in a classical way. We describe the first results on action recognition using ToF camera...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.