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 this paper, we present a filtering method for estimating the shape and end effector pose of a highly articulated surgical snake robot. Our algorithm introduces new kinematic models that are used in the prediction step of an extended Kalman filter whose update step incorporates measurements from a 5-DOF electromagnetic tracking sensor situated at the distal end of the robot. A single tracking sensor...
We address the general object tracking with arbitrary shape using rangefinders, which is a key module for detecting surrounding traffic and infrastructure for an autonomous driving vehicle. An Expectation-Maximization (EM) algorithm with locally matching is proposed for motion estimation between two consecutive range images. The complexity of the algorithm is O(N) with N the numbers of scan points...
We propose a bilateral symmetry Gabor Wavelet Network (BSGWN) for face modeling and online tracking. Bilateral symmetry wavelet pairs reduce the computational complexity of the BSGWN optimization and yield robust tracking performance in real world environments. We decompose face image into a set of frequency components. The face model of Gabor wavelets is built on the reconstructed image from corresponding...
This paper presents a method to extract cells from form documents of an unknown format based on intersection tracking and global optimization. Because of the increasing varieties of forms and complications in the forms, cell extraction has become a key factor in automatic form recognition. The proposed method produces cell candidates by using intersection features and tracing intersection points to...
Facial expression tracking is a challenging task because the head pose may change in a large range and the expression is highly non-rigid. It can be formulized as an energy minimization problem. The two most important issues are the construction of the cost function and the selection of the initial value. In this paper, we present a fast and robust expression tracking algorithm called Composite Constraints...
The main contribution of this paper is a new people detection algorithm based on motion information. The algorithm builds a people motion model based on the Implicit Shape Model (ISM) Framework and the MoSIFT descriptor. We also propose a detection system that integrates appearance, motion and tracking information. Experimental results over sequences extracted from the TRECVID dataset show that our...
Tracking moving objects across events that break the continuity of the trajectory, such as occlusions or temporary exits from the scene, usually requires that a model of the objects of interest is created and maintained. Commonly used model representations are prone to errors when the objects can change the direction of their motion. In this paper we introduce a novel model representation, the MultiView...
This paper presents several methods for application in CCTV systems in order to support operators' duties. These methods are based on video processing only. In result, the attention of the operator can be attracted using an alarm signal. Additional information about objects can be delivered or the automatic control of PTZ cameras applied. Among the considered methods are: people detection, silhouette...
Left ventricular (LV) deformation analysis can provide valuable information about cardiac function. Echocardiography is a non-invasive method for imaging the motion of the heart. Two methods that have been used for quantitative deformation analysis in echocardiography are shape tracking and speckle tracking. Shape tracking provides good displacement values on the boundaries of the myocardium, while...
Given the time lapse images of human Neuro Stem Cells (hNSC) marked by fluorescent proteins, that are obtained from a confocal laser microscope, we present algorithms to identify, segment, track, and estimate statistical parameters of the cells. The structure of these cells are quite complex and irregular, which makes segmentation and tracking even more challenging. We use a novel combination of Difference...
An image stream can be represented by 2FxP measurement matrix of the image coordinates of P points tracked through F frames. We show that under orthographic projection this matrix is of rank 3. Using this observation, the factorization method uses the singular value decomposition technique to factor the measurement matrix into two matrices which represent object shape and the motion respectively....
We propose extending the concept of spatial constancy to haptic perception. In vision, spatial constancy refers to the conversion of retinotopic signals into spatiotopic representations, allowing the observer to perceive space independently of his or her own eye movements, or at least partly so. The problem would seem at least as important in haptic perception, where sensory surfaces undergo even...
Animal study plays a key role in understanding the mechanisms of emesis induced by many diseases and drug treatments. The traditional measurement of emesis usually requires manual observation which is labor intensive, difficult to standardize across coders, and often lacks spatial and temporal precision. This paper proposes a vision-based system for non-rigid tracking of musk shrews in videos and...
Firstly, this paper expounds the basic physical theory from the players, the sports technology aspects, and the quality of physical addresses is in the kinetic theory of the status. The role on the discussion of the physical and technical theory as well as the practice for the sport is in existence. Thus, with the practice of modern sports training, it gives a set of basic theory.
People detection and tracking is a key component for robots and autonomous vehicles in human environments. While prior work mainly employed image or 2D range data for this task, in this paper, we address the problem using 3D range data. In our approach, a top-down classifier selects hypotheses from a bottom-up detector, both based on sets of boosted features. The bottom-up detector learns a layered...
We propose a non-invasive ultrasound theragnostic system that tracks movement in an affected area (kidney stones, in the present study) by irradiating the area with high-intensity focused ultrasound (HIFU). In the present paper, the concept behind a novel medical support system that integrates therapy and diagnostics (theragnostics) is illustrated. The required functions for the proposed system are...
Lip tracking is crucial to the success of a lipreading recognition system. This paper presents a robust lip tracking algorithm using localized color active contours and deformable models. The proposed approach utilizes a combined semi-ellipse as the initial evolving curve and computes the localized energies in color space for evolving such that a separation of the original lip image into lip and non-lip...
In the present work, automatic corner detection in soccer games based on image features (e.g., object-based features) has been studied. For this purpose, a framework has been proposed that consists of five steps. This paper mainly focuses on the first three steps and specially ball detection step. Ball position on the field plays an important role in determining which event has occurred in the game...
This work deals with object tracking, on live video, through the boundary detection by Hough transform and color detection through color maps transform. It is presented an experiment where the trace of human iris is tested and the variations of texture and contour measurements are stored by the tracking, presented and discussed. Furthermore, it is done a breakdown of techniques used and the methodology...
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.