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2nd International Conference on image, vision and Computing, ICIVC 2017

作者： Luo, Jing Xichao, Teng Xiaohu, Zhang Lijun, Zhong Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation National University of Defense Technology Changsha China

ISBN: (纸本)9781509062379

In this paper, we propose a new method to automatically extract the main structure (fuselage and wings) of straight wing aircraft in photographic images using line clustering. We exploit the location, length and orientation features (parallel constraint) of line segments to group them into line clusters. The different line clusters correspond to the different structure of straight wing aircraft, and we can extract fuselage and wing of straight wing aircraft accordingly. We adopt line segment detector to extract line features, mean-shift and k-means++ approaches are applied to group line segments. The experimental results demonstrate that our method is effective for the structure extraction of straight wing aircraft. © 2017 IEEE.

关键词： Extraction

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Accurate Aspect Ratio Estimation in Scale Adaptive Tracking 3

Accurate Aspect Ratio Estimation in Scale Adaptive Tracking

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Lu, Weikang Su, Ang Zhang, Wenlong Shang, Yang College of Aerospace Science and Engineering National University of Defense Technology Hunan Changsha410073 China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Hunan Changsha410073 China

In visual object tracking, robust scale estimation is always a challenging problem. Because of the fast movement of the target, the background, the relative distance and relative azimuth angle between the target and the background usually change greatly. However, traditional correlation filtering tracking method cannot track the target accurately or even lose the target when the target scale and aspect ratio change. To address these problems, this paper adds two independent filters for the length and width scale estimation to complete the adaptive tracking on the basis of the translation filter. The experimental results in the public data set show that: compared with the original trackers, our method improves the tracking accuracy significantly, and meets the needs of real-time target tracking. © Published under licence by IOP Publishing Ltd.

关键词： Aspect ratio

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An Optimal Design Scheme of Missile Trajectory

An Optimal Design Scheme of Missile Trajectory

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2022 International Conference on Automation and Space Science and Technology, ASST 2022

作者： Zhang, Shilin College of Aerospace Science and Engineering National University of Defense Technology Hunan Changsha410073 China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Hunan Changsha410073 China

The optimization of missile trajectory is an important part of missile design. Its difficulty lies in the complex force of the missile and the different laws of the trajectory parameters in each stage. The existing trajectory simulation models have problems such as complex models, low accuracy, simplifying the initial motion state of the missile, and failing to fully reflect the characteristics of the active and passive motions. In order to solve these problems, this paper extracts important model variables on the basis of analyzing the force of the missile at different stages, and establishes a ballistic model with time-varying parameters. At the same time, according to the engineering design method of the missile flight program, the change rule of the pitch angle of the active phase of the missile with time is drawn up. Finally, an intercontinental ballistic missile is used as the object to simulate and analyze the proposed model. The results show that the method proposed in this paper can design and optimize missile trajectory well. © Published under licence by IOP Publishing Ltd.

关键词： Ballistics

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Improved Harris Corner Detection Algorithm Based on Canny Edge Detection and Gray Difference Preprocessing 3

Improved Harris Corner Detection Algorithm Based on Canny Ed...

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Luo, Chuan Sun, Xiaoliang Sun, Xiangyi Song, Junyao College of Aerospace Science and Engineering National University of Defense Technology Changsha Hunan410073 China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Changsha Hunan410073 China

Harris corner detection algorithm has been widely used in many computer vision allocations. However, it has low efficiency and accuracy, poor noise immunity and needs to set an artificial threshold. In this paper, an improved algorithm based on Canny edge detection and gray difference preprocessing is proposed. Firstly, Canny edge detection and gray difference preprocessing are used for corner prescreening to improve the detection efficiency, anti-noise, and rotation invariance. Secondly, non-maximum suppression is applied to the screened corners to reduce the number of false corners. Finally, the average of adjacent points method is used to solve the problem of corner cluster, and the detection results are compared the measurement accuracy is improved to sub-pixel level. Experimental results indicate that the proposed algorithm can accurately extract the corners in the image and remove the false corners and corner clusters. It achieves superior performance than existing methods. © Published under licence by IOP Publishing Ltd.

关键词： Signal detection

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3D-shape reconstruction based on a sub-pixel-level mapping relationship between the camera and projector

3D-shape reconstruction based on a sub-pixel-level mapping r...

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Chinese Society for Optical Engineering Conferences, CSOE 2016

作者： Lin, Huijing Liu, Haibo Yao, Linshen College of Aerospace Science and Engineering National University of Defense Technology Changsha Hunan410073 China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Changsha Hunan410073 China

ISBN: (纸本)9781510610118

To some extent, the mapping relationship between the camera and projector images determines the precision of surface reconstruction in digital close-range photogrammetry. In this paper, a new method is presented to achieve sub-pixel-level mapping between the camera and projector images. Instead of mapping the stripe from the camera to the projector, which is pixel-precision-based, a set of pixels that share the same decoded number were picked out on the camera images and their barycenter was calculated to mapped onto the pixel on the projector images. In most cases, the calculation of the barycenter is able to achieve sub-pixel precision. Compared with existing approaches based on the direct mapping of the stripe on the camera image to the projector image, the proposed method is characterized by higher accuracy in mapping the points and thus the surface reconstruction performance. The experimental results are presented to show the effectiveness of the proposed method in the improvement of the accuracy of shape reconstruction. © 2017 SPIE.

关键词： Cameras

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Studies on the influence of speckle density on the accuracy of digital image correlation method based on numerical simulation 3

Studies on the influence of speckle density on the accuracy ...

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Junyao, Song Zibin, Liu Chuan, Luo Country College of Aerospace Science and Engineering National University of Defense Technology Changsha Hunan410073 China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Changsha Hunan410073 China

Digital image correlation method is a high-precision non-contact modern optical mechanics method whose measurement accuracy is directly affected by the quality of the speckle pattern used. In this paper, a numerical simulation experiment is designed to measure and analyze the accuracy of DIC method using speckle patterns which are generated with different speckle densities. The results show that the measurement error of DIC decreases first and then increases with the increase of speckle density, and the error is minimum when the duty ratio is about 60% to 70%. The result show that in practical application the duty ratio of speckle on the specimen surface should be appropriately high, preferably between 60% and 70%. This study is helpful for speckle selection and related research in practical application. © Published under licence by IOP Publishing Ltd.

关键词： Numerical methods

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A New 2-Correspondences Monocular vision navigation Method under Planar Motion 3

A New 2-Correspondences Monocular Vision Navigation Method u...

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Yu, Yingjian Sun, Xiangyi Guan, Banglei College of Aerospace Science and Engineering National University of Defense Technology Hunan Changsha410073 China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation National University of Defense Technology Hunan Changsha410073 China

vision navigation has non-contact, high-precision and low-cost characteristics compared with other navigation method. This paper proposes a vision navigation method for planar moving platform in known scene based on two 2D-3D correspondences. Taking account of the arbitrary direction of camera and the relative pose between the camera and the platform, we propose a linear solver with unique solution, whose minimal number of requirement correspondences is 2 and can cope with arbitrary number of correspondences bigger than 2 directly. Our method is evaluated on both synthetic data and real-world data. The experimental results demonstrate that our method is high-accuracy and fast for vision navigation of planar moving platform. © Published under licence by IOP Publishing Ltd.

关键词： Cameras

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Rotational alignment of imu-camera systems with 1-point ransac 2nd

Rotational alignment of imu-camera systems with 1-point rans...

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2nd Chinese Conference on Pattern Recognition and Computer vision, PRCV 2019

作者： Guan, Banglei Su, Ang Li, Zhang Fraundorfer, Friedrich College of Aerospace Science and Engineering National University of Defense Technology Changsha China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Changsha China Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9783030317256

In this paper we present a minimal solution for the rotational alignment of IMU-camera systems based on a homography formulation. The image correspondences between two views are related by homography when the motion of the camera can be effectively approximated as a pure rotation. By exploiting the rotational angles of the features obtained by e.g. the SIFT detector, we compute the rotational alignment of IMU-camera systems with only 1 feature correspondence. The novel minimal case solution allows us to cope with feature mismatches efficiently and robustly within a random sample consensus RANSAC scheme. Our method is evaluated on both synthetic and real scene data, demonstrating that our method is suited for the rotational alignment of IMU-camera systems. © Springer Nature Switzerland AG 2019.

关键词： Cameras

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Planar homography based monocular SLAM initialization method 2019

Planar homography based monocular SLAM initialization method

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2nd International Conference on Service Robotics Technologies, ICSRT 2019

作者： Sun, Fang Sun, Xiangyi Guan, Banglei Li, Tao Sun, Cong Liu, Yingchao College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China Hunan Provincial Key Laboratory of Image Measurement and Vision Navigation Changsha410073 China Bank of China Beijing100818 China

ISBN: (纸本)9781450362467

Simultaneous Localization and Mapping (SLAM) is a popular topic in autonomous robots navigation. It has been studied for decades in both computer vision and robotics communities. Monocular systems is more cost effective compared to RGBD or Stereo systems;however, it is relatively complicated to initialize due to scale uncertainty. Under certain conditions, it is assumed that the camera only moves in a planar scene, which provides us with homography constraints. In this paper, the efficiency of monocular initialization was improved based on the open source platform ORB-SLAM2, employing the algorithm based on planar homography constraints. We compared the improved algorithm with the source code of ORB-SLAM2 on the public datasets. It showed that our algorithm has better stability and robustness in the planar scene dataset and more initializing map points. © 2019 Association for Computing Machinery.

关键词： Cost effectiveness

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Relay camera videometrics based conversion method for unstable platform to static reference

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Science China(Technological Sciences) 2011年第4期54卷 1017-1023页

作者： YU QiFeng SUN XiangYi JIANG GuangWen LIU XiaoLin ZHANG XiaoHu ZHOU Jian SHANG Yang College of Aerospace and Materials Engineering National University of Defense TechnologyChangsha 410073China 2 College of Optoelectronic Science and Engineering National University of Defense TechnologyChangsha 410073China College of Mechatronic Engineering and Automation National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory for Image Measurement and Vision Navigation Changsha 410073China

This article proposes a relay camera videometrics based method to convert an unstable measuring platform to a static reference to solve the problems of large error or invalidation caused by measuring platform instability in photogrammetric and videometric *** method installs a relay camera on the unstable platform and captures images of a reference marker fixed on a static reference or vice versa to resolve the 3D movement of the unstable platform relative to the static reference,based on which it corrects the error of the measured results and thus eliminating the influence of the platform *** finds new and important applications for videometrics by making high-precision dynamic measurement possible on unstable *** experiments and numerical simulations have proven its validity and practicability.

关键词： optical measurement videometrics unstable platform static reference conversion

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