Three-dimensional invariants of moving targets

2000 ◽  
Author(s):  
Mark A. Stuff
Keyword(s):  
Three Dimensional ◽  
Moving Targets ◽  
Dimensional Invariants

scholarly journals High-Accuracy Recognition and Localization of Moving Targets in an Indoor Environment Using Binocular Stereo Vision

2021 ◽  
Vol 10 (4) ◽  
pp. 234
Author(s):  
Jing Ding ◽  
Zhigang Yan ◽  
Xuchen We
Keyword(s):  
Stereo Vision ◽  
Stereo Matching ◽  
Three Dimensional ◽  
Target Localization ◽  
Parallel Structure ◽  
Moving Target ◽  
Target Area ◽  
Moving Targets ◽  
Binocular Stereo Vision ◽  
Binocular Stereo

To obtain effective indoor moving target localization, a reliable and stable moving target localization method based on binocular stereo vision is proposed in this paper. A moving target recognition extraction algorithm, which integrates displacement pyramid Horn–Schunck (HS) optical flow, Delaunay triangulation and Otsu threshold segmentation, is presented to separate a moving target from a complex background, called the Otsu Delaunay HS (O-DHS) method. Additionally, a stereo matching algorithm based on deep matching and stereo vision is presented to obtain dense stereo matching points pairs, called stereo deep matching (S-DM). The stereo matching point pairs of the moving target were extracted with the moving target area and stereo deep matching point pairs, then the three dimensional coordinates of the points in the moving target area were reconstructed according to the principle of binocular vision’s parallel structure. Finally, the moving target was located by the centroid method. The experimental results showed that this method can better resist image noise and repeated texture, can effectively detect and separate moving targets, and can match stereo image points in repeated textured areas more accurately and stability. This method can effectively improve the effectiveness, accuracy and robustness of three-dimensional moving target coordinates.

Simulation of a Frequency-Modulated Continuous-Wave (FMCW) Radar Using Fast Fourier Transforms (FFT)

2019 ◽  
pp. 196-211
Author(s):  
Akbar Eslami
Keyword(s):  
Continuous Wave ◽  
Fourier Transforms ◽  
Three Dimensional ◽  
Fast Fourier Transforms ◽  
Target Velocity ◽  
Signal Power ◽  
Moving Targets ◽  
Fmcw Radar ◽  
Radar Systems ◽  
Dimensional Graph

Frequency-modulated continuous-wave (FMCW) radar systems send known frequency signals to moving targets and receive the signal back to detectors. FMCW systems can be used to measure exact heights of landing aircrafts. In addition, they are used in early warning radar systems and in proximity sensors. The advantage of using these radar signals is that the object target velocity and range can be quickly calculated using fast Fourier transforms (FFT). Taking the row-wise FFT of the signal matrix gives range information in form of range bins. Then taking column-wise FFT enables displaying the velocity for each range bin. The three-dimensional graph of the resulting matrix gives a signal power plot with respect to both the range bin numbers and their velocity.

Three-Dimensional Through-Wall Sensing of Moving Targets Using Passive Multistatic Radars

2016 ◽  
Vol 9 (1) ◽  
pp. 141-148 ◽  
Author(s):  
Gianluca Gennarelli ◽  
Raffaele Solimene ◽  
Francesco Soldovieri ◽  
Moeness G. Amin
Keyword(s):  
Three Dimensional ◽  
Moving Targets

scholarly journals VIII. The differential invariants of space

1904 ◽  
Vol 202 (346-358) ◽  
pp. 277-333 ◽  
Keyword(s):  
Three Dimensional ◽  
Differential Invariants ◽  
Two Dimensional ◽  
Binary Forms ◽  
Ordinary Space ◽  
Natural Development ◽  
Dimensional Invariants

The present memoir is intended to carry out investigations, concerned with the differential invariants of ordinary space and of surfaces in that space, similar to those in a former memoir, concerned with the differential invariants of a surface and of curves upon that surface. The method used in the former memoiris used here in what is the obviously natural development. It is based upon the method, which was originated by Lie and amplified by Professor Žorawski. When applied to two-dimensional invariants, it proved possible to modify and simplify the later stages of the calculations by making them dependent upon the concomitants of a system of simultaneous binary forms. When applied to three-dimensional in variants, it proves possible to effect a corresponding simplification in the later stages of the calculations; the required functions are found to be the invariants and the contravariants of a system of simultaneous ternary forms.

Research on the Control Strategy of Eye-to-Hand Target Track Real-Time Tracking System

2014 ◽  
Vol 1055 ◽  
pp. 334-337
Author(s):  
Jia Xin Zhang ◽  
Xiao La Yao ◽  
Jiang Tao Miao
Keyword(s):  
Real Time ◽  
Control Strategy ◽  
Vision System ◽  
Tracking System ◽  
Three Dimensional ◽  
Target Position ◽  
Color Measurement ◽  
Moving Targets ◽  
Target Track ◽  
Real Time Tracking

This paper presents an Eye-to-hand system, designed for hand-eye system presents a automatically real-time tracking of moving targets control strategy. The first strategy uses a color mark on the target, the use of binocular stereo vision system for color measurement and then in the visual system of the target three-dimensional reconstruction to give the three-dimensional coordinates in the visual coordinate system when the target position and orientation when changes according to the amount of change in the three-dimensional coordinates of the direct control of the robot arm motion of each joint, enabling the tracking of moving targets.

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