scholarly journals Optical Flow Inversion for Remote Sensing Image Dense Registration and Sensor's Attitude Motion High-Accurate Measurement

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Chong Wang ◽  
Zheng You ◽  
Fei Xing ◽  
Borui Zhao ◽  
Bin Li ◽  
...  
Keyword(s):  
Optical Flow ◽  
Three Dimensional ◽  
Field Of View ◽  
Large Field ◽  
Inversion Method ◽  
Attitude Motion ◽  
Remote Sensor ◽  
Optical Flows ◽  
Angular Velocities ◽  
Attitude Measurements

It has been discovered that image motions and optical flows usually become much more nonlinear and anisotropic in space-borne cameras with large field of view, especially when perturbations or jitters exist. The phenomenon arises from the fact that the attitude motion greatly affects the image of the three-dimensional planet. In this paper, utilizing the characteristics, an optical flow inversion method is proposed to treat high-accurate remote sensor attitude motion measurement. The principle of the new method is that angular velocities can be measured precisely by means of rebuilding some nonuniform optical flows. Firstly, to determine the relative displacements and deformations between the overlapped images captured by different detectors is the primary process of the method. A novel dense subpixel image registration approach is developed towards this goal. Based on that, optical flow can be rebuilt and high-accurate attitude measurements are successfully fulfilled. In the experiment, a remote sensor and its original photographs are investigated, and the results validate that the method is highly reliable and highly accurate in a broad frequency band.

Optical System Design with High Resolution and Large Field of View for the Remote Sensor

2007 ◽  
Vol 364-366 ◽  
pp. 550-554
Author(s):  
Jun Chang ◽  
Zhi Cheng Weng ◽  
Yong Tian Wang ◽  
De Wen Cheng ◽  
Hui Lin Jiang
Keyword(s):  
High Resolution ◽  
Optical System ◽  
Design Method ◽  
Field Of View ◽  
Large Field ◽  
Wide Field ◽  
Remote Sensor ◽  
Wide Field Of View ◽  
Technological Developments ◽  
Technological Opportunities

In this paper, we are presenting a design method and its results for a space optical system with high resolution and wide field of view. This optical system can be used both in infrared and visible configurations. The designing of this system is based on an on-axis three-mirror anastigmatic (TMA) system. Here the on-axis concept allows wide field of view (FOV) enabling a diversity of designs available for the Multi-Object Spectrometer instruments optimized for low scattered and low emissive light. The available FOVs are upto 1º in both spectrum ranges, whereas the available aperture range is F/15 - F/10. The final optical system is a three-mirror telescope with two on-axis and one off-axis segment and its resolution is 0.3m or even lower. The distinguished feature of this design is that it maintains diffraction-limited image at wide wavelengths. The technological developments in the field of computer generated shaping of large-sized optical surface details with diffraction-limited imagery have opened new avenues towards the designing techniques. Such techniques permit us to expand these technological opportunities to fabricate the aspherical off-axis mirrors for a complex configuration.

Large field of view real-time three-dimensional imaging for ports

2011 ◽  
Author(s):  
Meijing Gao ◽  
Weilong Wu ◽  
Haihua Gu ◽  
Weihong Bi
Keyword(s):  
Real Time ◽  
Three Dimensional ◽  
Field Of View ◽  
Large Field ◽  
Three Dimensional Imaging

Comparison of Film and Video Techniques for Estimating Three-Dimensional Coordinates within a Large Field

1992 ◽  
Vol 8 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Rosa M. Angulo ◽  
Jesús Dapena
Keyword(s):  
Video Analysis ◽  
Three Dimensional ◽  
Control Object ◽  
Field Of View ◽  
Large Field ◽  
Wide Field ◽  
Film Analysis ◽  
Analysis Techniques ◽  
Wide Field Of View ◽  
Film And Video

This study compared the errors produced with 3-D video and film analysis techniques using the DLT method with fixed cameras when the images cover a wide field of view. The results indicated that with a large field of view (8 meters) the accuracy of video analysis is clearly inferior to that of film analysis. However, within the volume of the control object, both film and video analyses are still precise enough for most practical purposes. Errors were larger in landmarks outside the control object than in the points of the control object. The maximum errors in the calculated positions of external landmarks were particularly large in the video analysis. However, even these rather large errors for points markedly outside the control object may be acceptable. It will depend on the requirements of each particular investigation.

scholarly journals Light-Sheet Microscopy for Surface Topography Measurements and Quantitative Analysis

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2842 ◽  
Author(s):  
Zhanpeng Xu ◽  
Erik Forsberg ◽  
Yang Guo ◽  
Fuhong Cai ◽  
Sailing He
Keyword(s):  
Surface Topography ◽  
Spatial Resolution ◽  
Scattered Light ◽  
Three Dimensional ◽  
Light Sheet ◽  
Field Of View ◽  
Large Field ◽  
Linear Calibration ◽  
Industrial Sample ◽  
Light Sheet Microscopy

A novel light-sheet microscopy (LSM) system that uses the laser triangulation method to quantitatively calculate and analyze the surface topography of opaque samples is discussed. A spatial resolution of at least 10 μm in z-direction, 10 μm in x-direction and 25 μm in y-direction with a large field-of-view (FOV) is achieved. A set of sample measurements that verify the system′s functionality in various applications are presented. The system has a simple mechanical structure, such that the spatial resolution is easily improved by replacement of the objective, and a linear calibration formula, which enables convenient system calibration. As implemented, the system has strong potential for, e.g., industrial sample line inspections, however, since the method utilizes reflected/scattered light, it also has the potential for three-dimensional analysis of translucent and layered structures.

A New Kind of Integrating Sphere Radiation Calibration System for Satellite Remote Sensors

2012 ◽  
Vol 500 ◽  
pp. 569-573
Author(s):  
Ting Liang Guo ◽  
Guo Jin Feng ◽  
Yu Wang ◽  
Ying Wei He
Keyword(s):  
Light Exposure ◽  
Field Of View ◽  
Flash Lamp ◽  
Large Field ◽  
Spectral Radiance ◽  
Integrating Sphere ◽  
Wave Band ◽  
Calibration System ◽  
Remote Sensors ◽  
Remote Sensor

A new kind of half integrating sphere radiation system that has the adjustable area of radiating surface in the 380nm-2500nm wave band is introduced in this paper. The opening diameter of the integrating sphere reaches to Φ600mm. Half Integrating sphere radiation system is mainly composed of a half sphere, extension part, cyclic annular baffles and other components. The diameter of half-integrating sphere is Φ1800mm. The radiance uniformity through opening reaches up to 98%. Systems can now be used for all types of large field of view of satellite remote sensor for the calibration of spectral radiance; in addition, it can also be applied for various types of light exposure calibration such as flash lamp and so on.

Geometric Calibration of Artificial Compound Eye System for Large Field of View Three-Dimensional Detection

2017 ◽  
Vol 37 (2) ◽  
pp. 0215002
Author(s):  
简慧杰 Jian Huijie ◽  
何建争 He Jianzheng ◽  
王克逸 Wang Keyi
Keyword(s):  
Compound Eye ◽  
Three Dimensional ◽  
Field Of View ◽  
Large Field ◽  
Geometric Calibration

scholarly journals Three dimensional parallelized RESOLFT nanoscopy for volumetric live cell imaging

2020 ◽  
Author(s):  
Andreas Bodén ◽  
Francesca Pennacchietti ◽  
Ilaria Testa
Keyword(s):  
Live Cell Imaging ◽  
Cell Imaging ◽  
Three Dimensional ◽  
Live Cell ◽  
Field Of View ◽  
Resolving Power ◽  
Large Field ◽  
Optical Scheme ◽  
Spatial Dimensions ◽  
Fluorescent Molecules

AbstractThe volumetric architecture of organelles and molecules inside cells can only be investigated with microscopes featuring sufficiently high resolving power in all three spatial dimensions. Current methods suffer from severe limitations when applied to live cell imaging such as long recording times and/or photobleaching. By introducing a novel optical scheme to switch reversibly switchable fluorescent molecules, we demonstrate volumetric nanoscopy of living cells with resolution below 100 nm in 3D, large field of view and minimal illumination intensities (W-kW/cm2).

Novel Near Field Detector for Three-Dimensional X-Ray Diffraction Microscopy

MRS Advances ◽  
2018 ◽  
Vol 3 (39) ◽  
pp. 2341-2346 ◽  
Author(s):  
Scott Annett ◽  
Sergio Morelhao ◽  
Darren Dale ◽  
Stefan Kycia
Keyword(s):  
New Technologies ◽  
Spatial Information ◽  
Near Field ◽  
Three Dimensional ◽  
High Energy ◽  
Field Of View ◽  
Large Field ◽  
X Ray Diffraction ◽  
Synchrotron Source ◽  
X Ray

AbstractThree dimensional X-ray diffraction (3DXRD) microscopy is a powerful technique that provides crystallographic and spatial information of a large number, of the order of thousands, of crystalline grains in a sample simultaneously. A key component of every 3DXRD microscopy experiment is the near field detector that provides high resolution spatial information of the grains. In this work we present a novel design for a semi-transparent, 16 megapixel near field detector. As opposed to a typical single scintillator phosphor detector, this design, we call the Quad Near Field Detector, uses four quadrants. It has a total field of view is 5.3 mm x 5.3 mm with an effective pixel size of 1.3 µm x 1.3 µm. The detector’s relatively large field of view can be used to obtain higher order diffraction spots which we anticipate will lead to improved spatial resolution in grain reconstructions. The large field of view can also enable the detector to be positioned further from the sample, in this way increasing the working distance and enabling larger environmental cells for in-situ studies. Many alignment parameters can be resolved by careful mechanical design. For this reason a novel translation stage for focusing the microscopes was developed, tested, and implemented. The near field detector was calibrated and characterized at the Cornell High Energy Synchrotron Source. The operational feasibility of such a multi-plate detector demonstrated in this work paves the way for new technologies in instrumentation of 3DXRD microscopy.

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