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.
Online object tracking is a challenging issue because the appearance of an object tends to change due to intrinsic or extrinsic factors. In this paper, we propose a tracking algorithm based on probabilistic hypergraph ranking. First, three types of hypergraphs are constructed to encode local affinity information. Then, a probabilistic hypergraph is built by combining three distinct hypergraphs linearly...
Infrared small target detection technology has great significance in the infrared guidance, infrared warming, video surveillance and other fields. From the perspective of human visual saliency, our paper proposes a novel infrared dim small target detection algorithm based on frequency domain saliency. First, we get saliency map in the frequency domain. The algorithm combines the amplitude spectrum...
Coning algorithm is the kernel during attitude algorithm design in strapdown inertial navigation. A new approach is presented for strapdown coning algorithm design based on batch-processing. Unlike previous time or frequency Taylor series expansion techniques, the new method achieves the rotation vector through discrete Fourier transforms(DFT) and inverse Fourier transforms(IFT) of the inputs. This...
An analysis of the observable degree of two tracking system is presented. It is shown that through the method based on mutual information, we can calculate the exact degree of observability of the system states and determine the estimation performance of the extended kalman filter(EKF) and particle filter(PF). Simulation results demonstrate the validity of the method.
In this paper, a new approach based on the q-method for coarse alignment is presented. Compared with the standard approach which is based on determining DCM (direct cosine matrix), the new method can avoid solving the DCM and get the initial quaternion directly that we used for the navigation calculation.
The mean-shift algorithm has achieved considerable success in object tracking due to its simplicity and robustness. However, the lack of template update often leads to out of adaptation to affine transformation of the object. The Lucas-Kanade algorithm has some advantages in obtaining the affine parameters. In this paper, we introduce the inverse compositional algorithm, which is equivalent to but...
Mutual information (MI) has been very successful in multisensor or multimodal image matching. However, it may lead to mismatching due to lack of spacial information. In this paper, based on a local dominant orientation (LDO), which is a stable nature among images of different sensors and is widely used in the relative rotation estimation, an improved MI for multisensor images matching is proposed...
The mean-shift algorithm has achieved considerable success in object tracking due to its simplicity and robustness. However, the lack of spatial information often leads to false positives of the color based tracker when the background has a similar color style. Furthermore, the classical similarity measures are not very discriminative. In this paper, an improved mean-shift tracking algorithm with...
This paper presents a novel approach for interest point and region detection which is invariant to affine transformations. Such transformations introduce significant changes in the point location as well as in the scale and the shape of the neighborhood of an interest point. Our approach allows to solve for these problems simultaneously. The approach is based on three key ideas: 1) Interest points...
Corner detection is an important early vision problem. In early vision processing of the mammalian visual system, the oriented tuned, contrast-driven cells in the visual cortex have the problems of positional and orientational uncertainty. That means the oriented receptive fields (RFs) of simple cells can not detect the orientational information of the line ends and corners efficiently. In this paper,...
Robust control of a class of uncertain Takagi-Sugeno (T-S) fuzzy system is investigated in the paper by using fuzzy region concept. The general uncertain T-S fuzzy model with Standard Fuzzy Partition (SFP) inputs is converted into fuzzy region ones. A Fuzzy Region Controller (FRC) is designed based on the fuzzy region concept, and sub-models in a fuzzy region share the same FRC. The relaxed stability...
Keypoints are important features in the perceptual system of humans. They provide important information for focus-of-attention (FoA) and object categorization/recognition. Different types of keypoints have been used in computer vision applications. In this paper, we propose a method which extracts ??salient?? points in the meaning of biological vision by utilizing the multi-scale Gabor energy operator...
This paper presents a visual cortex inspired method for corner and vertex detection. Endstopped cells in cortical area VI, which combine outputs of complex cells tuned to different orientations, serve to detect line and edge crossings (junctions) and points with a large curvature. This property is used for corner and vertex detection in this paper. We utilize the endstopped neurons model of Dobbins,...
In this paper, we are interested in the problem of motion-blurred image blind restoration. A new method for this ill-posed problem is proposed. We present an adaptive Huber Markov Random Field (HMRF) image prior model as the regularization term, which can be suitable for motion-blurred situation, then turn the ill-posed problem to well-posed. It can preserve fine image details and edges. However,...
The quality of motion-blurred image restoration is highly dependent on the blur direction identification, which is an important and difficult problem in image restoration. In frequency domain, we summarize four important characteristics of motion-blurred image, and then propose a method to reduce the impact of deficiencies in frequency characteristics by using the binaryzation operation, the morphological...
A novel dynamic equation of a flexible satellite with flexible appendages is developed based on the coupling deformation field, in which the second-order coupling term of axial displacement caused by that of transverse is included. Lagrangian principle and assumed mode method are used to derive the first-order approximate model of the multibody system. Theoretical analysis and numerical simulations...
This paper presents a dynamic model of a flexible hub-beam system with a tip mass. With the consideration of the second-order term of the coupling deformation field, dynamic equations of the flexible hub-beam system are developed by using assumed mode method (AMM) and Lagrangian principle. The corresponding dynamics model of the tip mass is developed in a consistent manner. Numerical simulations and...
Considering inertial sensors measurements (ISM) containing many stochastic noises, the application of lifting wavelet transform(LWT) algorithm in the de-noising of ISM is put forward for Strapdown Inertial Navigation System(SINS) alignment. First, the LWT algorithm is introduced and applied into the de-noising of ISM. Then, the coarse alignment model and nonlinear fine alignment model under large...
In vision aided terminal inertial navigation system, the camera always attaches rigidly, or straps down, to the body of missile. Because the pitch angle of the missile usually is not constant and varies with time, the optical axis of the camera is not vertical. Then the rectangular border of the runway stripe in horizontal land plane is projected as trapezoid in the image plane. The weak perspective...
In the dither ring laser gyro (DRLG) strapdown inertial navigation system (SINS), gyro outputs are often pre-filtered to eliminate the dither modulated, but the influence of the filtered data on the attitude algorithm Is often ignored. It is found that the conventional coning algorithms can not work to high accuracy for the filtered gyro outputs which have a shaped frequency. So the coning algorithm...
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.