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.
In the design of oil and gas platforms, the layout problem is similar to both the bin packing problem and the multiprocessor scheduling problem, both of which are NP-hard. Yet, people are able to use their knowledge and experience to layout equipment in a close to optimal way. The question discussed here is whether this knowledge can be captured in a Knowledge Based Engineering-system, and by extension,...
One formulation to automatically compute the number of holes of a 2-D binary object is introduced in this paper. This formulation is useful for both 4-connected and 8-con-nected objects. The correctness of the functioning of the formulation is also established theoretically. Results with a set of images are provided to demonstrate the utility and validity of the proposed formulation. To end up, our...
This paper is devoted to the comparison of the numerically simulated Chua's circuit and the real circuit. The aim of the research was to figure out the factors affecting the computer simulation accuracy, and to find the ways to improve it. It was discovered that the most influence is exerted by an inaccuracy of the nonlinear Chua's diode characteristic measurement, a numerical integration method used...
Edge detection remains a challenging task in many applications even with the abundance of commonly used methods such as Sobel, Robert, Prewitt, Canny, and Cellular Automata. In this paper, a new method is proposed for edge detection using morphological operations and utilizing erosion processes to identify the edges in an image. In this work we propose to use morphological operators of disk shape...
This paper presents an application of 3d-reconstruction and graph theory in the field of archaeology. The classification and reconstruction of ancient pots and vessels out of fragments (so-called sherds) is an important aspect of archaeological research work. Up to now this is a time consuming, inaccurate, and subjective task which leads to tons of unclassified fragments in archives. Computer aided...
Space-filling curves have intrigued both artists and mathematicians for a long time. They bridge the gap between aesthetic forms and mathemtical geometry. To enable construction by computer, an efficient recursive algorithm for the generation of space-filling curves is given. The algorithm is elegant, short and considerably easier to implement than previous recursive and non-recursive algorithms,...
Signal decimation aimed at optimal spectral packing has a variety of applications in areas ranging from array processing to image processing. In this article we propose and discuss a new method for determining decimation grid and prefilter that best fit the spectral extension of any 2D signal defined on an arbitrary sampling lattice. The method has been implemented and tested on digital images in...
As smart phones and tablets are becoming ubiquitous and taking over as the primary choice for accessing the Internet worldwide, ensuring a secure gateway to the servers serving such devices become essential. CAPTCHAs play an important role in identifying human users in internet to prevent unauthorized bot attacks. Even though there are numerous CAPTCHA alternatives available today, there are certain...
The development of sensemaking support systems requires that one cares about knowledge representation. Motivated by the fact that no single representation method is ideally suited by itself for all tasks, the authors propose a collection of knowledge representation artifacts appropriate for processing in computer-based support systems for situation analysis. The approach described makes it possible...
Illustrators who have some drawing experience can sometimes draw an ideal stroke repeatedly. However, they cannot always reproduce an ideal stroke that they have drawn, because they do not understand how they moved their own hands while drawing it. Therefore we proposed a new drawing learning support system based on present- ing the ideal stroke motion of the learners (past brilliant learner- self...
Present paper shows that the system of residual classes is quite promising for usage in modern computing systems, especially for performing operations with multi-digit numbers. The analytical expressions and the conditions which allowed calculating all versions of modules for a given number in perfect shape system of residual classes were obtained.
Offline signature verification is a challenging and important form of biometric identification. Other biometric measures don't have variability as that of signatures which poses difficult problem in verification of signatures. In this paper, we explore a novel approach for verification of signatures based on curve matching using shape descriptor and Euclidian distance. In our approach, the measurement...
In order to model the design process of pressure hull, a dedicated system based on VISUAL BASIC was developed. During the design process, we followed the principle "simple, convenient and smart". The patterns for calculating and checking were built by computer programming language. Using this system, the designer will get the results quickly and correctly.
Structure from Motion (SfM) technique is usually used for camera motion recovery and 3D shape estimation The major problem with most SfM techniques is the computation time. Typically, most SfM techniques involve basic matrix operations. In case of large matrices these operations can increase the computation time of SfM algorithm. Though newer and faster algorithms are developed, as the data increases...
Content based image retrieval has become a major research interest recently. This paper presents an improved image similarity measure for image retrieval system. In the region based image comparison, two images are usually compared in terms of sum of the Euclidean distances among their regions. In this work, the image similarity measure is enhanced through a fuzzyfication of regions' importance and...
A number of efforts have been applied on human activity recognition such as face recognition and motion analysis. The major problems in recognition are: 1. Scale. 2. Shift. 3. Projection. Human Activities are identified by the pose of the body such as standing, sitting etc. and some of the activities are like the emotions, facial expressions etc. Generally, human activity recognition is achieved by...
This paper proposes a method for contour completion of a skew-symmetry object which is partly occluded by other objects. The proposed method assumes that skew symmetry of a shape can be measured by correlation with its reflection on a no orthogonal plane. Under the assumption, the method estimates a skew-symmetry axis and a skew transverse angle, and then reflects the contour to the estimated axis...
This paper presents a sonification model to convert object tracking information into sound in real time. The goal is to generate a sound that describes the information given by a trajectory - such as position, direction, velocity and shape - to help visually impaired people to "see" the world: how can we describe to them a square like we do by drawing it in a sheet of paper? The usage can...
This paper proposes a method for simulating human opinions about graphical artistic expressions like calligraphy using computers. Scanned images of handwriting texts from a large database are labeled as "beautiful writing" or "ugly writing" by two persons based on their own likes. Our objective is to replicate these opinions using machine learning techniques. Shape features are...
A fully programmable digital instrument for the emulation in real-time of signals with bandwidth up to 400 MHz from generic radiation detection systems is presented. The instrument is not a pulse generator of recorded shapes but a synthesizer of random pulses compliant to programmable statistics for height and starting time of events. Completely programmable procedures for emulation of several noise...
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.