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 recent years, there have been a variety of proposals for high quality 3D reconstruction by fusion of depth and normal maps that contain good low and high frequency information respectively. Typically, these methods create an initial mesh representation of the complete object or scene being scanned. Subsequently, normal estimates are assigned to each mesh vertex and a mesh-normal fusion step is...
This paper mainly studies the autonomous navigation method for the constellation. Based on the measurements of inter-satellite ranging and direction, a federated filter algorithm is presented. Then, to redue the error caused by the constellation rotation, a camera is applied in observations. Ultimately, the feasibility of reducing the number of cameras observations is discussed. The simulation results...
Texture reconstruction is the last step of 3D reconstruction pipelines that makes 3D geometry models very impressive and beautiful. Once the 3D model is created through structure-from-motion, multi-view stereo and mesh reconstruction, real image based texture is mapped to the models. But it is not easy to generate high quality texture. There are many difficulties cause problems: the large number of...
Monocular ORB-SLAM has been proved to be one of the best open-source SLAM method. However, it is still unsatisfying especially in low illumination indoor environment, which is caused by scale recovery and wrong feature matching. In this paper, we proposed a vehicle model based monocular ORBSLAM method supplemented by April-Tag to improve the performance of original algorithm. This approach is practical...
This paper explores the predictive power of perhaps the most well-supported human performance model in the context of a complex ecological task. The model is Fitts Law, which describes the classic speed-accuracy tradeoff of goal-directed motor behavior. The task is modern pistol shooting competition, which demands explicit cognitive strategy and full-body biomechanical coordination. Data obtained...
Accurate hand-eye calibration is a very significant task in robotics. Many algorithms focus on L optimization, and Least Square Estimation (LSE) is usually employed to deal with this problem. For the reason that LSE can only be applied to occasions that errors obey normal distribution, LSE can lead to a lower precision of calibration result when gross errors occur. Different from the existing approaches,...
This paper presents design and implementation of face tracking system using servo-motor-controlled Pan-Tilt visual system. The objective is to maintain the position of a tracked object at the center of frame window on the screen. A simple camera is used as visual sensor to obtain the face object's actual position. Combination of Viola-Jones and Template Matching algorithms are used for face detection,...
We present a method to assist pre-touch on multi-touch surfaces using features extracted from the fingertips of the user's hands. Pixel area a feature obtained from the contour of a fingertip is computed and tracked using commodity cameras to obtain the velocity of approaching fingers. We target sound volume control for digital multi-touch instruments an area where pre-touch is demonstrated with our...
A myoelectric prosthesis, which can be used as a replacement for a person's upper limb, is able to control many hand motions optionally via surface electromyography (sEMG). Although many researchers have developed myoelectric prostheses that realize various motions, evaluation of their practicality has only been carried out on small numbers of patients. To solve this problem, a myoelectric prosthesis...
3D object selection and manipulation is one of the essential features for any augmented reality (AR) system. However, distant object selection and manipulation still suffer from lack of accuracy and precision. This paper introduces an alternate 3D interaction technique for selection and manipulation distant 3D object in in immersive video see-through AR. The proposed interaction technique offers a...
In this article, we focus on how to fuse two systems between SLAM and UAV. The main contribution is that using the UAV attitude controller provides a reliable initial value for the SLAM system, which makes the direct method of SLAM more quickly and effective converge. The UAV position controller increases the stability by receiving the exact local information from SLAM. That allows two independent...
A calibration method for vision sensor system is proposed, this method use checkerboard as the target which is folded out of an angle, and using several point pairs to obtain the optimal matrix, point pairs come from the world and the corresponding pixel image coordinate system, and then camera's all parameters can be obtained by factorizing this matrix. Calibration can be done using only one image...
The increasing scale of Structure-from-Motion is fundamentally limited by the conventional optimization framework for the all-in-one global bundle adjustment. In this paper, we propose a distributed approach to coping with this global bundle adjustment for very large scale Structurefrom-Motion computation. First, we derive the distributed formulation from the classical optimization algorithm ADMM,...
Finding a closed form solution to a system of polynomial equations is a common problem in computer vision as well as in many other areas of engineering and science. Gröb-ner basis techniques are often employed to provide the solution, but implementing an efficient Gröbner basis solver to a given problem requires strong expertise in algebraic geometry. One can also convert the equations to a polynomial...
Body Condition Scoring (BCS) is a method of evaluating fatness or thinness in cows, and it is important to manage productivity of the cows. However, it is not easy to measure BCS by observing animals because it consumes much time and costs, especially in the large-scale farming. Therefore, almost farmers are not conducting regular evaluation of BCS. In this paper, we propose the noninvasive method...
Infrared thermography has been widely used today for nondestructive evaluation and testing of materials and other qualitative approaches. However, the field of thermography is much less developed. Most of the existing research uses a relatively simple model, while more realistic models are currently in development. One interesting scenario for thermography is determining the material composition of...
At the core of many Computer Vision applications stands the need to define a mathematical model describing the imaging process. To this end, the pinhole model with radial distortion is probably the most commonly used, as it balances low complexity with a precision that is sufficient for most applications. On the other hand, unconstrained non-parametric models, despite being originally proposed to...
Due to the nonlinear response of digital phase-shifting profilometry (PSP), phase errors are inevitable in the retrieved 3-D profiles and result in negative impacts on the measurement accuracy of the PSP system. A novel method is presented in this paper to reduce the impact. Instead of compensating phase errors in the retrieved 3-D profile, specific harmonics are superimposed upon the initial fringe...
The system is specially developed for elderly people living alone in their homes. A novel method for detection of fall in home environment is presented. Video clips of certain duration specifying fall and non-fall activities are considered for experimentation. Shi-Tomasi algorithm is used to find interest points which are tracked by Pyramidal Lucas-Kanade algorithm. The speed and direction of motion...
In the article a new optimization approach for thermal processes modeling has been presented. In the designed method, the considered process is monitored by a measurement system with a thermal camera. Then, a spatio-temporal dynamics is discretized and transformed into a large-scale optimization problem with differential-algebraic constraints. To preserve the process dynamics in the assumed range,...
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.