Advances and perspectives of on-orbit geometric calibration for high-resolution optical satellites

2015 ◽  
Author(s):  
Guoqing Zhou ◽  
Linjun Jiang ◽  
Na Liu ◽  
Chenyang Li ◽  
Mingyan Li ◽  
...  
Keyword(s):  
High Resolution ◽  
Geometric Calibration

Design and Calibration of a 3D High-Resolution Surface Profiling System Using Photometric Stereo

2015 ◽  
Author(s):  
Boren Li ◽  
Tomonari Furukawa
Keyword(s):  
High Resolution ◽  
Light Intensity ◽  
Target Surface ◽  
Photometric Stereo ◽  
Radiometric Calibration ◽  
Geometric Calibration ◽  
Surface Profiling ◽  
Surface Normal ◽  
3D Methods ◽  
Intensity Calibration

This paper presents the design and calibration of a 3D high-resolution surface profiling system using photometric stereo (PS). This system is mainly composed of a high resolution DSLR camera with a macro lens facing perpendicularly to the target surface, and several LEDs tilting towards the surface constrained by a light fixture. With each LED turned on at a time to create one lighting direction, the camera fixed at the same position captures an image. PS with surface normal integration (SNI) are then performed to reconstruct the surface in 3D. Methods of four calibrations for the developed system are proposed to achieve better accuracy, which are the camera radiometric calibration, the camera geometric calibration, the light direction calibration and the light intensity calibration. Experiments have demonstrated that the developed system with the calibration processes could achieve the accuracy in the order of 10 microns.

scholarly journals Improvement and Assessment of the Absolute Positioning Accuracy of Chinese High-Resolution SAR Satellites

2019 ◽  
Vol 11 (12) ◽  
pp. 1465
Author(s):  
Deng ◽  
Zhang ◽  
Cai ◽  
Xu ◽  
Zhao ◽  
...  
Keyword(s):  
High Resolution ◽  
Propagation Delay ◽  
Reference Points ◽  
Calibration Model ◽  
Land Resource ◽  
Positioning Accuracy ◽  
Geometric Calibration ◽  
Atmospheric Propagation ◽  
Absolute Positioning ◽  
The Absolute

In recent years, China has launched YaoGan-13 and GaoFen-3, high-resolution synthetic aperture radar (SAR) satellites that can acquire global high-resolution images. The absolute positioning accuracy of such satellites is important for mapping areas without ground reference points and for automated processing. However, satellites without geometric calibration have poor absolute positioning accuracy, greatly restricting their application (e.g., land resource surveys). Therefore, they cannot meet national demands for high-resolution SAR images with good geometric accuracy. Here, we propose a series of methods to improve the absolute positioning accuracy of YaoGan-13 and GaoFen-3, such as the multiple-image combined calibration strategy and geometric calibration model for a real continuously moving configuration, including consideration of atmospheric propagation delay. Using high-accuracy ground control data collected from different areas, the 2-D and 3-D absolute positioning accuracies of YaoGan-13 and GaoFen-3 were assessed after implementation of the improvement measures. Experimental results showed that, after calibration, the 2-D absolute positioning accuracy of YaoGan-13 and GaoFen-3 are improved from 43.86 m to 2.57 m and from 30.34 m to 4.29 m, respectively. In addition, the 3-D absolute positioning accuracies of YaoGan-13 in plane and elevation are 3.21 m and 2.22 m, respectively. Improving the absolute positioning accuracy of these satellites could broaden the scope of their potential applications in the future.

scholarly journals MODELS FOR PHOTOGRAMMETRIC PROCESSING OF INFORMATION FROM “RESOURCE-P” SATELLITES

2016 ◽  
Vol XLI-B6 ◽  
pp. 169-171
Author(s):  
V. Poshekhonov ◽  
V. Eremeev ◽  
А. Kuznetcov ◽  
A. Kochergin
Keyword(s):  
High Resolution ◽  
Measurement Information ◽  
Navigation Systems ◽  
Mean Square ◽  
Practical Application ◽  
Geometric Calibration ◽  
Distinctive Features ◽  
Geodetic Coordinates ◽  
Orientation Parameters ◽  
Wide Swath

The present paper provides information about imagery and navigation systems of the Russian high resolution satellites "Resource- P". Models of image geolocation used for photogrammetric processing of information from all types of imagery systems are designed. Design of these models is based on two task solutions: correct processing of the measurement information and geometric calibration of the imagery systems. <br><br> It is shown that for high-precision interior orientation parameters adjustment of the high-resolution "Geoton" instrument the method of self-calibration should be used. The technology of calibration activities is considered. Distinctive features of calibration of the hyperspectral and wide-swath imagery systems are noted. It is represented in the paper that after calibration the root mean square error (RMSE) of measured geodetic coordinates of objects on images do not exceed 10 m. <br><br> Examples of the obtained models practical application for photogrammetric processing of images from “Resource-P” satellites are shown.

scholarly journals LOW FREQUENCY ERROR ANALYSIS AND CALIBRATION FOR HIGH-RESOLUTION OPTICAL SATELLITE’S UNCONTROLLED GEOMETRIC POSITIONING

2016 ◽  
Vol XLI-B1 ◽  
pp. 395-399
Author(s):  
Mi Wang ◽  
Chengcheng Fang ◽  
Bo Yang ◽  
Yufeng Cheng
Keyword(s):  
High Resolution ◽  
Information Fusion ◽  
Optical Axis ◽  
Low Frequency ◽  
Calibration Method ◽  
Error Model ◽  
Model Construction ◽  
Frequency Error ◽  
Star Sensor ◽  
Geometric Calibration

The low frequency error is a key factor which has affected uncontrolled geometry processing accuracy of the high-resolution optical image. To guarantee the geometric quality of imagery, this paper presents an on-orbit calibration method for the low frequency error based on geometric calibration field. Firstly, we introduce the overall flow of low frequency error on-orbit analysis and calibration, which includes optical axis angle variation detection of star sensor, relative calibration among star sensors, multi-star sensor information fusion, low frequency error model construction and verification. Secondly, we use optical axis angle change detection method to analyze the law of low frequency error variation. Thirdly, we respectively use the method of relative calibration and information fusion among star sensors to realize the datum unity and high precision attitude output. Finally, we realize the low frequency error model construction and optimal estimation of model parameters based on DEM/DOM of geometric calibration field. To evaluate the performance of the proposed calibration method, a certain type satellite’s real data is used. Test results demonstrate that the calibration model in this paper can well describe the law of the low frequency error variation. The uncontrolled geometric positioning accuracy of the high-resolution optical image in the WGS-84 Coordinate Systems is obviously improved after the step-wise calibration.

PanCam: the ‘science eyes’ of the Rosalind Franklin (ExoMars 2022) rover  

2021 ◽  
Author(s):  
Andrew Coates ◽  
Keyword(s):  
High Resolution ◽  
Stereo Pair ◽  
Radiometric Calibration ◽  
3D Vision ◽  
Planetary Protection ◽  
Geometric Calibration ◽  
Life On Mars ◽  
Existence And Stability ◽  
Interface Unit ◽  
First Time

<p>The scientific objectives of the ExoMars Rosalind Franklin rover [1] are designed to answer several key questions in the search for life on Mars. In particular, the unique subsurface drill will address some of these questions for the first time, such as the possible existence and stability of sub-surface organics. PanCam [2] will establish the surface geological and morphological context for the mission, working in collaboration with other context instruments. Here, we describe the PanCam scientific objectives in geology, atmospheric science and 3D vision. We discuss the design of PanCam, which includes a stereo pair of Wide Angle Cameras (WACs), each of which has an 11 position filter wheel, and a High Resolution Camera (HRC) for high resolution investigations of rock texture at a distance. The cameras and electronics are housed in an optical bench that provides the mechanical interface to the rover mast and a planetary protection barrier.  The electronic interface is via the PanCam Interface Unit (PIU), and power conditioning is via a DC-DC converter. PanCam also includes a calibration target mounted on the rover deck for radiometric calibration, fiducial markers for geometric calibration and a rover inspection mirror. Recent simulations [3] show the view from PanCam, the ‘science eyes’ of the Rosalind Franklin rover.</p> <p><strong>References:</strong></p> <p>[1] Vago, J.L., F. Westall, A.J. Coates, et al., Habitability on Early Mars and the Search for Biosignatures with the ExoMars Rover, <em>Astrobiology</em>, 17(6-7), 471-510, doi:10.1089/ast.2016.1533, Jul 2017.</p> <p>[2] Coates, A.J., R. Jaumann, A.D. Griffiths, et al., The PanCam instrument for the ExoMars rover, <em>Astrobiology</em>, 17 (6-7), 511-541, doi: 10.1089/ast.2016.1548, Jul 2017.</p> <p>[3] Miles, H.C., M.D. Gunn and A.J. Coates, Seeing through the ‘Science Eyes’ of the ExoMars Rover, IEEE Computer Graphics & Applications, Applications Department, 40, 71-81, doi: 10.1109/MCG.2020.2970796, Mar-Apr 2020.</p>

scholarly journals GEOMETRICAL CALIBRATION FOR THE PANROVER: A STEREO OMNIDIRECTIONAL SYSTEM FOR PLANETARY ROVER

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 1151-1158
Author(s):  
E. Simioni ◽  
C. Pernechele ◽  
C. Re ◽  
L. Lessio ◽  
G. Cremonese
Keyword(s):  
High Resolution ◽  
Imaging System ◽  
Autonomous Driving ◽  
Image Sensor ◽  
Stereoscopic Vision ◽  
Optical Systems ◽  
Stereo Images ◽  
New Paradigm ◽  
Geometric Calibration ◽  
Calibration Methods

Abstract. A novel panoramic stereo imaging system is proposed in this paper. The system is able to carry out a 360° stereoscopic vision, useful for rover autonomous-driving, and capture simultaneously a high-resolution stereo scene. The core of the concept is a novel "bifocal panoramic lens" (BPL) based on hyper hemispheric model (Pernechele et al. 2016). This BPL is able to record a panoramic field of view (FoV) and, simultaneously, an area (belonging to the panoramic FoV) with a given degree of magnification by using a unique image sensor. This strategy makes possible to avoid rotational mechanisms. Using two BPLs settled in a vertical baseline (system called PANROVER) allows the monitoring of the surrounding environment in stereoscopic (3D) mode and, simultaneously, capturing an high-resolution stereoscopic images to analyse scientific cases, making it a new paradigm in the planetary rovers framework.Differently from the majority of the Mars systems which are based on rotational mechanisms for the acquisition of the panoramic images (mosaicked on ground), the PANROVER does not contain any moving components and can rescue a hi-rate stereo images of the context panorama.Scope of this work is the geometric calibration of the panoramic acquisition system by the omnidirectional calibration methods (Scaramuzza et al. 2006) based on Zhang calibration grid. The procedures are applied in order to obtain well rectified synchronized stereo images to be available for 3D reconstruction. We applied a Zhang chess boards based approach even during STC/SIMBIO-SYS stereo camera calibration (Simioni et al. 2014, 2017). In this case the target of the calibration will be the stereo heads (the BPLs) of the PANROVER with the scope of extracting the intrinsic parameters of the optical systems. Differently by previous pipelines, using the same data bench the estimate of the extrinsic parameters is performed.

scholarly journals MODELS FOR PHOTOGRAMMETRIC PROCESSING OF INFORMATION FROM “RESOURCE-P” SATELLITES

2016 ◽  
Vol XLI-B6 ◽  
pp. 169-171
Author(s):  
V. Poshekhonov ◽  
V. Eremeev ◽  
А. Kuznetcov ◽  
A. Kochergin
Keyword(s):  
High Resolution ◽  
Measurement Information ◽  
Navigation Systems ◽  
Mean Square ◽  
Practical Application ◽  
Geometric Calibration ◽  
Distinctive Features ◽  
Geodetic Coordinates ◽  
Orientation Parameters ◽  
Wide Swath

The present paper provides information about imagery and navigation systems of the Russian high resolution satellites "Resource- P". Models of image geolocation used for photogrammetric processing of information from all types of imagery systems are designed. Design of these models is based on two task solutions: correct processing of the measurement information and geometric calibration of the imagery systems. <br><br> It is shown that for high-precision interior orientation parameters adjustment of the high-resolution "Geoton" instrument the method of self-calibration should be used. The technology of calibration activities is considered. Distinctive features of calibration of the hyperspectral and wide-swath imagery systems are noted. It is represented in the paper that after calibration the root mean square error (RMSE) of measured geodetic coordinates of objects on images do not exceed 10 m. <br><br> Examples of the obtained models practical application for photogrammetric processing of images from “Resource-P” satellites are shown.

scholarly journals Analysis of a Scalable Multi-Projector System for Virtual Reality Environments

2013 ◽  
Vol 12 (1) ◽  
pp. 15-29 ◽  
Author(s):  
Fernando Teubl ◽  
Marcio Cabral ◽  
Marcelo Zuffo ◽  
Celso Kurashima
Keyword(s):  
Virtual Reality ◽  
High Resolution ◽  
Low Cost ◽  
Visual Quality ◽  
Visual Performance ◽  
System Software ◽  
Geometric Calibration ◽  
Cave System ◽  
Image Blending ◽  
Projector Calibration

Virtual reality environments with multi-projector systems provide better visual quality, higher resolution and more brightness than traditional single-projector systems. Moreover, using multiple low-cost projectors is economically advantageous in comparison to an expensive high-end projector for equivalent visual performance. This article presents the research and development of a scalable multiprojection system that enables the construction of virtual reality systems with a large number of projectors and graphics computers, and that is capable of achieving a high resolution display. We demonstrate the viability of such system with the development of a camera-based multiprojector system library called FastFusion, which automatically calibrates casually aligned projectors to properly blend different projections. Our system software improves known algorithms in the literature for projector calibration and image blending. As a result, FastFusion improves system scalability and calibration reliability. In a detailed analysis of the visual performance of FastFusion in a CAVE system with three walls, eighteen projectors and nine computers, we achieved a satisfactory result for variance in geometric calibration and for graphics performance. Thus, our library is suitable for building complex projector systems and with retina resolution.

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