Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
We present novel exploration algorithms and a control law that enable the construction of Voronoi diagrams over unknown areas using a single autonomous vehicle equipped with range sensors. Our control law and exploration algorithms are provably complete. The control law uses range measurements to enable tracking Voronoi edges between two obstacles. Exploration algorithms make decisions at vertices...
Collisions often occur because the area behind a car is not clearly visible in the dark. In this paper, we propose a system to measure the distance between the rear of the car and a target behind it in order to reduce the number of these accidents. Because it is expensive and time-consuming to develop new devices, this system uses a factory-installed monocular camera, brake light, and tail light that...
The medial axis, also known as symmetry axis, is a special type of skeleton that has a number of interesting properties. It is a powerful tool in applications involving pattern recognition, image analysis, path planning and mesh generation, to name a few. Since the proposal and definition of the medial axis, in 1967, much effort has been done to develop fast and accurate methods for calculating the...
In this paper, we propose a novel strategy based on spherical feature extraction and fast polar image correlation to recognize number ball which has arbitrary rotation pose just using single calibrated camera. The multiple view instances of a number ball are collected as a prior knowledge of a class and a simple distance measurement is applied to decide which class the candidate ball belongs to. The...
This paper presents a method for estimating how the driver of a vehicle can use steering, braking or acceleration to avoid a collision with a moving object. In the method, the motion of the object can be described with an arbitrary motion model and polygons are used to describe its expected extension. The key idea is to parameterize the motion of the vehicle such that an analytical solution can be...
Wells and drainage holes are widely used in hydraulic engineering and groundwater exploration, such as foundation pit drainage, dam body and foundation drainage, groundwater exploitation and so on. Now the finite element method (FEM) is usually used to analyze the seepage flow in engineering. Based on the FEM, the mid-section method and the equivalent nodal method are usually used to calculate the...
Scattering problems with multiple canonical scatterers, like cylinders and spheres, may be modeled by utilizing the orders-of-scattering approach. This method provides an exact solution; however, being iterative in nature, the accuracy of the solution depends on the number of iterations; in other words, the number of higher-order scattered fields taken into account. The orders-of-scattering solutions...
Visual exploratory data analysis represents a well-accepted imaging modality for high-dimensional DCE-MRI-derived breast cancer data. We employ this paradigm for discriminating between malignant and benign lesions based on different shape descriptors thanks to proven and novel dimension reduction algorithms. We demonstrate that shape structure changes such as weighted 3D Krawtchouck moments outperform...
Parts-based 2D shape decomposition is important to shape analysis and recognition. Much research in psychology has shown that the human visual system tends to segment complex objects at regions of deep concavities, so concavity measurement is very important to shape decompositions, but it still has not a well accepted definition. In this paper, we propose a method for measuring concavities and segmenting...
In this work, we described a new two-stage hierarchical framework for mammogram retrieval. We tested the proposed approach on the reference library from USF-DDSM. For each query ROI (region of interest), the proposed scheme first computes its 14 texture and shape features, then the voting method based on five classifiers is used to classify the ROIs in the reference library, this phase eliminates...
For large scale problems Q-Learning often suffers from the Curse of Dimensionality due to large numbers of possible state-action pairs. This paper develops a multiresolution state-space discretization method for the episodic unsupervised learning method of Q-Learning, in which a state-space is adaptively discretized by progressively finer grids around the areas of interest within the state or learning...
The goal of this work is to stabilize the shape and orientation of formations of N identical and fully actuated agents, each governed by double-integrator dynamics. Using stability and rigidity properties inherent to tensegrity structures, we first design a tensegrity-based, globally exponentially stable control law in one dimension. This stabilizes given inter-agent spacing along the line, thereby...
Arbitrarily shaped video objects are an important concept in modern video coding methods. The techniques presently used are not based on image elements but rather video objects having an arbitrary shape. The contour of this shape has to be transmitted and therefore compressed as well. The example is standard MPEG-4. In mobile video communication, transmission errors and loss of data can occur. In...
We present a new type of oriented bounding surfaces, which is particularly well suited for shortest distance computations. The bounding surfaces are obtained by considering surfaces whose support functions are restrictions of quadratic polynomials to the unit sphere. We show that the common normals of two surfaces of this type - and hence their shortest distance - can be computed by solving a polynomial...
We propose a new approach to appearance based loop detection from metric 3D maps, exploiting the NDT surface representation. Locations are described with feature histograms based on surface orientation and smoothness, and loop closure can be detected by matching feature histograms. We also present a quantitative performance evaluation using two real-world data sets, showing that the proposed method...
In this study, grasp positions of human hands are measured for planar objects for development of a reasonable grasp criterion for a two-soft-fingered robotic hand. We first propose a grasp criterion that yields the best grasping position for a robot hand with two soft fingers. To examine the properties of this criterion with respect to some weighting coefficients included in the criterion, a grasping...
Dynamic time warping (DTW) distance measure has increasingly been used as a similarity measurement for various data mining tasks in place of traditional Euclidean distance metric due to its superiority in sequence-alignment flexibility. However, in some tasks where shape averaging is required, e.g., in template matching and k-means clustering problems, current averaging methods are inaccurate in that...
In recent work, we introduced the notion of a construction tree of simplices for a linkage L under distance constraints, and showed that the deformation space DSpace(L) of such an L (i.e., its configuration space CSpace(L) modulo rigid motions of ambient space respecting all system specifications) carries geometrically-defined simplex-based parameters that endow it with a ldquopractically piecewise-convexrdquo...
In this paper a novel blind method for watermarking of Farsi (Persian language) texts based on employing the existing common sloping letters is presented. The proposed method embeds the watermark data in four common sloping letters by readjusting the amount of their slopes. This approach can be categorized under character coding methods. The presented algorithm is so simple to implement and experiments...
Recently, several image retrieval systems have been developed, which regard the Web as a large scale image database. In this study, we use the image itself as index keys. From the Web, a set of similar images is retrieved based on numerical characteristics of images and simultaneously text information accompanying with the images is presented to a user. The user evaluates the relationship between...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.