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Journal articles on the topic 'Stereo geometry'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Jeong, J. "IMAGING GEOMETRY AND POSITIONING ACCURACY OF DUAL SATELLITE STEREO IMAGES: A REVIEW." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-2/W4 (September 13, 2017): 235–42. http://dx.doi.org/10.5194/isprs-annals-iv-2-w4-235-2017.

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Many previous studies have demonstrated the potential applications of stereo pairs obtained from high-resolution satellites for accurate geo-positioning, but it should be noted that they are based on the conventional use of single-satellite stereo images produced by integrating two images taken by the same satellite. Considering the emergence of various types of satellite data and the requirements to combine these data, it is important to investigate dual-satellite stereo images that integrate two images taken by different satellites. This study reviews the image geometry and positioning accur

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Nguyen, Van, Joaquim G. Sanctorum, Sam Van Wassenbergh, Joris J. J. Dirckx, Jan Sijbers, and Jan De Beenhouwer. "Geometry Calibration of a Modular Stereo Cone-Beam X-ray CT System." Journal of Imaging 7, no. 3 (2021): 54. http://dx.doi.org/10.3390/jimaging7030054.

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Compared to single source systems, stereo X-ray CT systems allow acquiring projection data within a reduced amount of time, for an extended field-of-view, or for dual X-ray energies. To exploit the benefit of a dual X-ray system, its acquisition geometry needs to be calibrated. Unfortunately, in modular stereo X-ray CT setups, geometry misalignment occurs each time the setup is changed, which calls for an efficient calibration procedure. Although many studies have been dealing with geometry calibration of an X-ray CT system, little research targets the calibration of a dual cone-beam X-ray CT

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François, Alexandre R. J., Gérard G. Medioni, and Roman Waupotitsch. "Mirror symmetry⇒2-view stereo geometry." Image and Vision Computing 21, no. 2 (2003): 137–43. http://dx.doi.org/10.1016/s0262-8856(02)00149-x.

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4

Boufama, Boubakeur S. "Using geometry towards stereo dense matching." Pattern Recognition 33, no. 5 (2000): 871–73. http://dx.doi.org/10.1016/s0031-3203(99)00150-8.

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Dazhi, Zhang, Wang Yongtao, and Tao Wenbing. "Epipolar Geometry Estimation for Wide Baseline Stereo." International Journal of Engineering and Manufacturing 2, no. 3 (2012): 38–45. http://dx.doi.org/10.5815/ijem.2012.03.06.

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6

Negahdaripour, S. "Epipolar Geometry of Opti-Acoustic Stereo Imaging." IEEE Transactions on Pattern Analysis and Machine Intelligence 29, no. 10 (2007): 1776–88. http://dx.doi.org/10.1109/tpami.2007.1092.

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Yan, Tingman, Xilian Yang, and Qunfei Zhao. "Symmetry Weight-sharing for Patch-based Stereo Matching." Journal of Physics: Conference Series 2281, no. 1 (2022): 012015. http://dx.doi.org/10.1088/1742-6596/2281/1/012015.

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Abstract Neural networks are becoming more popular than traditional methods in stereo matching. The networks can be decomposed into four sub-modules: feature extraction / matching cost computation, cost aggregation, disparity computation / optimization, and disparity refinement. A typical design for the feature extraction networks is that the left and right branches share the same weights. However, the Siamese networks are weak at distinguishing neighboring patches because of the interference of geometric distortion on slanted surfaces. This paper proposes symmetry weight-sharing to improve th

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Méxas, José Geraldo Franco, Karla Bastos Guedes, and Ronaldo da Silva Tavares. "Stereo orthogonal axonometric perspective for the teaching of Descriptive Geometry." Interactive Technology and Smart Education 12, no. 3 (2015): 222–40. http://dx.doi.org/10.1108/itse-09-2014-0027.

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Purpose – The purpose of this paper is to present the development of a software for stereo visualization of geometric solids, applied to the teaching/learning of Descriptive Geometry. Design/methodology/approach – The paper presents the traditional method commonly used in computer graphic stereoscopic vision (implemented in C language) and the proposed method (implemented in GeoGebra software). The proposed method is a new methodology for stereo spatial visualization. It uses the orthogonal axonometric perspective obtained from the mongean projections of the object, both concepts studied in De

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Noh, Myoung-Jong, and Ian M. Howat. "Analysis of PlanetScope Dove Digital Surface Model Accuracy Using Geometrically Simulated Images." Remote Sensing 15, no. 14 (2023): 3496. http://dx.doi.org/10.3390/rs15143496.

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Many objectives in geoscience and engineering require Earth surface elevations at greater temporospatial resolution and coverage than are currently available. This may be achieved with stereo imagery from large constellations of “small sats”, such as PlanetScope Doves. Obtaining Digital Surface Models (DSMs) of sufficient quality from these images is challenging due to their lower resolution and weaker stereo geometry relative to stereo mode satellites such as WorldView. The quality can be improved by utilizing their much larger numbers of repeat images, but this requires effective stereopair

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Dornaika, F., and Chi-kit Ronald Chung. "Stereo geometry from 3-D ego-motion streams." IEEE Transactions on Systems, Man and Cybernetics, Part B (Cybernetics) 33, no. 2 (2003): 308–23. http://dx.doi.org/10.1109/tsmcb.2002.805698.

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Zhang, Hong, Haojie Li, Zhihui Wang, Yuxin Yue, and Shenglun Chen. "Geometry and context guided refinement for stereo matching." IET Image Processing 14, no. 12 (2020): 2652–59. http://dx.doi.org/10.1049/iet-ipr.2019.1636.

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12

Vivet, Damien, Jordi Vilà-Valls, Gaël Pages, and Eric Chaumette. "Robust Filter-Based Visual Navigation Solution with Miscalibrated Bi-Monocular or Stereo Cameras." Remote Sensing 14, no. 6 (2022): 1470. http://dx.doi.org/10.3390/rs14061470.

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This work addressed the problem of miscalibration or decalibration of mobile stereo/bi-monocular camera setups. We especially focused on the context of autonomous vehicles. In real-world conditions, any optical system is subject to various mechanical stresses, caused by vibration, rough handling, collisions, or even thermal expansion. Such mechanical stresses change the stereo pair geometry, and as a consequence, the pre-calculated epipolar geometry or any geometric-based approach is no longer valid. The standard method, which consists of estimating the calibration online, fails in such harsh

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Alsadik, B., and N. A. Abdulateef. "EPIPOLAR GEOMETRY BETWEEN PHOTOGRAMMETRY AND COMPUTER VISION – A COMPUTATIONAL GUIDE." ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences V-5-2022 (May 18, 2022): 25–32. http://dx.doi.org/10.5194/isprs-annals-v-5-2022-25-2022.

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Abstract. Stereo image orientation is one of the major topics in computer vision, photogrammetry, and robotics. The stereo vision problem solution represents the basic element of the multi-view Structure from Motion SfM in computer vision and photogrammetry.A successfully reconstructed stereo image geometry is based on solving the epipolar constraint using the fundamental matrix which is based on the projective geometry in computer vision. However, in photogrammetry, the problem is well known as relative orientation and there is a different solution that is based on the euclidean geometry usin

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Liu, J., S. Ji, C. Zhang, and Z. Qin. "EVALUATION OF DEEP LEARNING BASED STEREO MATCHING METHODS: FROM GROUND TO AERIAL IMAGES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2 (May 30, 2018): 593–97. http://dx.doi.org/10.5194/isprs-archives-xlii-2-593-2018.

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Dense stereo matching has been extensively studied in photogrammetry and computer vision. In this paper we evaluate the application of deep learning based stereo methods, which were raised from 2016 and rapidly spread, on aerial stereos other than ground images that are commonly used in computer vision community. Two popular methods are evaluated. One learns matching cost with a convolutional neural network (known as MC-CNN); the other produces a disparity map in an end-to-end manner by utilizing both geometry and context (known as GC-net). First, we evaluate the performance of the deep learni

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Akilan, A., D. Sudheer Reddy, V. Nagasubramanian, P. V. Radhadevi, and G. Varadan. "Epipolar Rectification for CARTOSAT-1 Stereo Images Using SIFT and RANSAC." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-8 (November 28, 2014): 1095–98. http://dx.doi.org/10.5194/isprsarchives-xl-8-1095-2014.

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Cartosat-1 provides stereo images of spatial resolution 2.5 m with high fidelity of geometry. Stereo camera on the spacecraft has look angles of +26 degree and -5 degree respectively that yields effective along track stereo. Any DSM generation algorithm can use the stereo images for accurate 3D reconstruction and measurement of ground. Dense match points and pixel-wise matching are prerequisite in DSM generation to capture discontinuities and occlusions for accurate 3D modelling application. Epipolar image matching reduces the computational effort from two dimensional area searches to one dime

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Oh, Jaehong, and Changno Lee. "Satellite Stereo Image Processing for 3D Topographic Mapping." Abstracts of the ICA 1 (July 15, 2019): 1. http://dx.doi.org/10.5194/ica-abs-1-276-2019.

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<p><strong>Abstract.</strong> The large scale topographic map generation is mostly carried out using the aerial images while the high resolution satellite data are gaining popularity because of its large swath width that enables the efficient and economic mapping even over inaccessible areas. To use the satellite data for the 3D topographic mapping, the data should be acquired in the stereo mode and they requires to be aligned for the epipolar geometry. The accurate epipolar image resampling aligns stereo images to enable a stereo display on the computer monitor where human o

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Lebamovski, Penio, and Emiliyan Petkov. "USAGE OF 3D TECHNOLOGIES IN STEREOMETRY TRAINING." Proceedings of CBU in Social Sciences 1 (November 16, 2020): 139–45. http://dx.doi.org/10.12955/pss.v1.61.

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StereoMV is a part of а dissertation on a topic "Stereoscopic Training System". The main purpose of the stereo system is to facilitate learning of the concepts of stereometry. The system is the author’s and offers a new approach for generating geometric bodies. The boundary method is used for creating the figures, which is based on the method of the boundaries of Isaac Newton and the "Indivisible" of the Italian mathematician Bonaventura Cavalieri. The study shows how by using 3D technologies such as virtual reality and 3D printing, the process of teaching in stereometry classes will be signif

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18

Basta, Tayeb. "Shortcomings and Flaws in the Mathematical Derivation of the Fundamental Matrix Equation." International Journal of Computer Science and Information Technology 14, no. 1 (2022): 19–29. http://dx.doi.org/10.5121/ijcsit.2022.14102.

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In stereo vision, the epipolar geometry is the intrinsic projective geometry between the two views. The essential and fundamental matrices relate corresponding points in stereo images. The essential matrix describes the geometry when the used cameras are calibrated, and the fundamental matrix expresses the geometry when the cameras are uncalibrated. Since the nineties, researchers devoted a lot of effort to estimate the fundamental matrix. Although it is a landmark of computer vision, in the current work, three derivations of the essential and fundamental matrices have been revised. The Longue

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Aguilar, M. A., R. Jiménez-Lao, and F. J. Aguilar. "ASSESSMENT OF STEREO-EXTRACTED DSM FROM WORLDVIEW-3 OVER DIFFERENT LAND COVERS DEPENDING ON THE IMAGING GEOMETRY." ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences V-2-2022 (May 17, 2022): 31–38. http://dx.doi.org/10.5194/isprs-annals-v-2-2022-31-2022.

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Abstract. WorldView-3's 0.31m resolution in panchromatic mode, makes it one of the highest resolution commercial satellite in the world. This fact, together with its excellent stereo capabilities, make this satellite ideal for digital surface model (DSM) extraction working on very complex morphologies where a higher level of detail is required. In this communication we assess the quality (both completeness and vertical accuracy) of DSM extracted from WorldView-3 stereo pairs depending on the image geometry and sun position. Three different land covers (bare soil, urban areas and agricultural p

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20

Wang, Jian, Xiaolei Lv, Zenghui Huang, and Xikai Fu. "An Epipolar HS-NCC Flow Algorithm for DSM Generation Using GaoFen-3 Stereo SAR Images." Remote Sensing 15, no. 1 (2022): 129. http://dx.doi.org/10.3390/rs15010129.

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Radargrammetry is a widely used methodology to generate the large-scale Digital Surface Model (DSM). Stereo matching is the most challenging step in radargrammetry due to the significant geometric differences and the inherent speckle noise. The speckle noise results in significant grayscale differences of the same feature points, which makes the traditional Horn–Schunck (HS) flow or multi-window zero-mean normalized cross-correlation (ZNCC) methods degrade. Therefore, this paper proposes an algorithm named Epipolar HS-NCC Flow (EHNF) for dense stereo matching, which is an improved HS flow meth

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21

Super, B. J., and W. N. Klarquist. "Patch-based stereo in a general binocular viewing geometry." IEEE Transactions on Pattern Analysis and Machine Intelligence 19, no. 3 (1997): 247–53. http://dx.doi.org/10.1109/34.584102.

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Bjorkman, M., and J. O. Eklundh. "Real-time epipolar geometry estimation of binocular stereo heads." IEEE Transactions on Pattern Analysis and Machine Intelligence 24, no. 3 (2002): 425–32. http://dx.doi.org/10.1109/34.990147.

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23

Liang, Zhengfa, Hengzhu Liu, Linbo Qiao, Yiliu Feng, and Wei Chen. "Improving stereo matching by incorporating geometry prior into ConvNet." Electronics Letters 53, no. 17 (2017): 1194–96. http://dx.doi.org/10.1049/el.2017.2418.

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24

Wu, Hsien-Huang P., Meng-Tu Lee, Ping-Kuo Weng, and Soon-Lin Chen. "Epipolar geometry of catadioptric stereo systems with planar mirrors." Image and Vision Computing 27, no. 8 (2009): 1047–61. http://dx.doi.org/10.1016/j.imavis.2008.09.007.

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Yue, Q., X. Tang, and X. Gao. "GF-7 IMAGING SIMULATION AND DSM ACCURACY ESTIMATE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-1/W1 (May 31, 2017): 353–56. http://dx.doi.org/10.5194/isprs-archives-xlii-1-w1-353-2017.

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GF-7 satellite is a two-line-array stereo imaging satellite for surveying and mapping which will be launched in 2018. Its resolution is about 0.8 meter at subastral point corresponding to a 20&amp;thinsp;km width of cloth, and the viewing angle of its forward and backward cameras are 5 and 26 degrees. This paper proposed the imaging simulation method of GF-7 stereo images. WorldView-2 stereo images were used as basic data for simulation. That is, we didn’t use DSM and DOM as basic data (we call it “ortho-to-stereo” method) but used a “stereo-to-stereo” method, which will be better to refle

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de Franchis, C., E. Meinhardt-Llopis, J. Michel, J. M. Morel, and G. Facciolo. "An automatic and modular stereo pipeline for pushbroom images." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-3 (August 7, 2014): 49–56. http://dx.doi.org/10.5194/isprsannals-ii-3-49-2014.

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The increasing availability of high resolution stereo images from Earth observation satellites has boosted the development of tools for producing 3D elevation models. The objective of these tools is to produce digital elevation models of very large areas with minimal human intervention. The development of these tools has been shaped by the constraints of the remote sensing acquisition, for example, using ad hoc stereo matching tools to deal with the pushbroom image geometry. However, this specialization has also created a gap with respect to the fields of computer vision and image processing,

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Pi, Y., and B. Yang. "BLOCK ADJUSTMENT OF MULTISPECTRAL IMAGES WITHOUT GCP AIDED BY STEREO TLC IMAGES FOR ZY-3 SATELLITE." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences V-2-2020 (August 3, 2020): 65–70. http://dx.doi.org/10.5194/isprs-annals-v-2-2020-65-2020.

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Abstract. Multispectral images are the main data source of optical satellite remote sensing application. Consistent geometric accuracy is the basis of image registration and fusion. But the multispectral images usually collected by the nadir imaging camera are of weak geometric intersection, which will lead to the rank defect of the adjustment equation when performing block adjustment (BA) directly, making the solution unstable. Thus, a planar BA aided by additional digital surface model (DSM) which can overcome this weak geometry is often used to improve the geometric accuracy and consistency

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Zhang, Huangchuang, Ruoping Shi, and Ge Li. "Geometric Construction of Video Stereo Grid Space." Remote Sensing 14, no. 10 (2022): 2356. http://dx.doi.org/10.3390/rs14102356.

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The construction of digital twin cities is a current research hotspot. Video data are one of the important aspects of digital twin cities, and their digital modeling is one of the important foundations of its construction. For this reason, the construction and digital analysis of video data space has become an urgent problem to be solved. After in-depth research, this study found that the existing video space construction methods have three shortcomings: first, the problem of high requirements for objective conditions or low accuracy; second, the lack of easy and efficient mapping algorithms f

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Mahato, M., and S. Gedam. "PARTICLE SWARM OPTIMIZATION BASED APPROACH TO ESTIMATE EPIPOLAR GEOMETRY FOR REMOTELY SENSED STEREO IMAGES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-5 (November 19, 2018): 85–89. http://dx.doi.org/10.5194/isprs-archives-xlii-5-85-2018.

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<p><strong>Abstract.</strong> A novel particle swarm optimization based approach for the estimation of epipolar geometry for remotely sensed images is proposed and implemented in this work. In stereo vision, epipolar geometry is described using 3<span class="thinspace"></span>&amp;times;<span class="thinspace"></span>3 fundamental matrix and is used as a validation tool to assess the accuracy of the stereo correspondences. The validation is performed by enforcing the geometrical constraint of stereo images on the two perspective projections of a po

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Du, Jun, Ling Yu Yong, Mei Sun, and Jia Sheng Ge. "Study on Stereo Vision for 3D Reconstruction of Welding Seam." Advanced Materials Research 850-851 (December 2013): 212–16. http://dx.doi.org/10.4028/www.scientific.net/amr.850-851.212.

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The Monocular stereo vision sensor based on structured light is designed and invented for the detection of the weld seam. By incorporating the structured light, the corresponding points matching problem in the stereo vision has been solved effectively. Firstly, the built monocular stereo vision system is used to obtain the image information of seam surface. Then the image coordinate of the seam feature points in the two-dimensional plane can be identified and extracted, through the responding image processing and feature analysis of the seam image collected. After that, the three-dimensional c

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Pollick, F. E., and J. S. Tittle. "Grasping Stereo and Texture Cue Combinations." Perception 25, no. 1_suppl (1996): 121. http://dx.doi.org/10.1068/v96p0205.

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Studies of grasp indicate that the reach-to-grasp movement is essentially preprogrammed and relies heavily on estimates of object geometry provided by vision. Moreover, computational analyses of two-point grasps suggest that the identification of pairs of grasp points requires extensive computation of surface geometry. Thus, one can view subjects' decisions of how to obtain a stable two-point grasp as a good indicator of the perceptuo-motor system's appreciation of surface structure. We probe this perceptuo-motor surface representation by examining grasps to ellipsoidal surfaces defined by the

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Shi, Peiteng, Markus Billeter, and Elmar Eisemann. "Stereo-consistent screen-space ambient occlusion." Proceedings of the ACM on Computer Graphics and Interactive Techniques 5, no. 1 (2022): 1–12. http://dx.doi.org/10.1145/3522614.

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Screen-space ambient occlusion (SSAO) shows high efficiency and is widely used in real-time 3D applications. However, using SSAO algorithms in stereo rendering can lead to inconsistencies due to the differences in the screen-space information captured by the left and right eye. This will affect the perception of the scene and may be a source of viewer discomfort. In this paper, we show that the raw obscurance estimation part and subsequent filtering are both sources of inconsistencies. We developed a screen-space method involving both views in conjunction, leading to a stereo-aware raw obscura

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Kölling, Tobias, Tobias Zinner, and Bernhard Mayer. "Aircraft-based stereographic reconstruction of 3-D cloud geometry." Atmospheric Measurement Techniques 12, no. 2 (2019): 1155–66. http://dx.doi.org/10.5194/amt-12-1155-2019.

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Abstract. This work describes a method to retrieve the location and geometry of clouds using RGB images from a video camera on an aircraft and data from the aircraft's navigation system. Opposed to ordinary stereo methods for which two cameras with fixed relative position at a certain distance are used to match images taken at the exact same moment, this method uses only a single camera and the aircraft's movement to provide the needed parallax. Advantages of this approach include a relatively simple installation on a (research) aircraft and the possibility to use different image offsets that

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Beekmans, Christoph, Johannes Schneider, Thomas Läbe, Martin Lennefer, Cyrill Stachniss, and Clemens Simmer. "Cloud photogrammetry with dense stereo for fisheye cameras." Atmospheric Chemistry and Physics 16, no. 22 (2016): 14231–48. http://dx.doi.org/10.5194/acp-16-14231-2016.

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Abstract. We present a novel approach for dense 3-D cloud reconstruction above an area of 10 × 10 km2 using two hemispheric sky imagers with fisheye lenses in a stereo setup. We examine an epipolar rectification model designed for fisheye cameras, which allows the use of efficient out-of-the-box dense matching algorithms designed for classical pinhole-type cameras to search for correspondence information at every pixel. The resulting dense point cloud allows to recover a detailed and more complete cloud morphology compared to previous approaches that employed sparse feature-based stereo or ass

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Jeong, Jaehoon, and Taejung Kim. "Analysis of Dual-Sensor Stereo Geometry and Its Positioning Accuracy." Photogrammetric Engineering & Remote Sensing 80, no. 7 (2014): 653–61. http://dx.doi.org/10.14358/pers.80.7.653.

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Baier, H., M. Buss, F. Freyberger, and G. Schmidt. "Interactive stereo vision telepresence for correct communication of spatial geometry." Advanced Robotics 17, no. 3 (2003): 219–33. http://dx.doi.org/10.1163/156855303764018477.

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DOWMAN, I. "The geometry of SAR images for geocoding and stereo applications." International Journal of Remote Sensing 13, no. 9 (1992): 1609–17. http://dx.doi.org/10.1080/01431169208904215.

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Hou, Jian, and Nai-ming Qi. "Geometry constraints and matching algorithm for lunar rover stereo vision." Optoelectronics Letters 1, no. 3 (2005): 235–37. http://dx.doi.org/10.1007/bf03033852.

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Sommer, J. R., T. High, P. Ingram, D. Kopf, R. Nassar, and I. Taylor. "Avian Extended Junctional SR: 3-D Geometry Rendered in Stereo." Microscopy and Microanalysis 3, S2 (1997): 247–48. http://dx.doi.org/10.1017/s1431927600008126.

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Extended junctional sarcoplasmic reticulum (EJSR) is an invariant differentiation of the sarcoplasmic reticulum (SR) in bird cardiac myocytes (CM) and central to excitation-contraction coupling (ECC). EJSR occurs as both continuous and discontinuous extensions of junctional sarcoplasmic reticulum (JSR), and surrounds and pervades the Z/I band as the “ EJSR Z-rete” whose geometry has mechanistic implications for the function of “couplings” in ECC, in general. “Peripheral coupling(s)” (PC) in birds, and the additional “interior coupling(s)” (IC) at transverse tubules (TT) in mammals, are formed

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Haase, I., P. Gläser, and J. Oberst. "BUNDLE ADJUSTMENT OF SPACEBORNE DOUBLE-CAMERA PUSH-BROOM IMAGERS AND ITS APPLICATION TO LROC NAC IMAGERY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W13 (June 5, 2019): 1397–404. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w13-1397-2019.

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<p><strong>Abstract.</strong> The TU Berlin group of the Lunar Reconnaissance Orbiter Camera (LROC) team has implemented a Bundle Adjustment (BA) for spaceborne multi-lenses line scan imagers, by rigorously modeling the geometric properties of the image acquisition. The BA was applied to stereo image sets of the LROC Narrow Angle Camera (NAC) and first results show, that the overall geometry of the stereo models were significantly improved. Ray intersection accuracies of initially up to several meters were homogenized within the integrated stereo models and improved to 0.14&a

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Schwendeman, Michael S., and Jim Thomson. "Sharp-Crested Breaking Surface Waves Observed from a Ship-Based Stereo Video System." Journal of Physical Oceanography 47, no. 4 (2017): 775–92. http://dx.doi.org/10.1175/jpo-d-16-0187.1.

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AbstractA new ship-based stereo video system is used to observe breaking ocean waves (i.e., whitecaps) as three-dimensional surfaces evolving in time. First, the stereo video measurements of all waves (breaking and nonbreaking) are shown to compare well with statistical parameters from traditional buoy measurements. Next, the breaking waves are detected based on the presence of whitecap foam, and the geometry of these waves is investigated. The stereo measurements show that the whitecaps are characterized by local extremes of surface slope, though the larger-scale, crest-to-trough steepness of

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Yu, Chanki, and Sang Wook Lee. "Deep Photometric Stereo Network with Multi-Scale Feature Aggregation." Sensors 20, no. 21 (2020): 6261. http://dx.doi.org/10.3390/s20216261.

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We present photometric stereo algorithms robust to non-Lambertian reflection, which are based on a convolutional neural network in which surface normals of objects with complex geometry and surface reflectance are estimated from a given set of an arbitrary number of images. These images are taken from the same viewpoint under different directional illumination conditions. The proposed method focuses on surface normal estimation, where multi-scale feature aggregation is proposed to obtain a more accurate surface normal, and max pooling is adopted to obtain an intermediate order-agnostic represe

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Peng, Man, Kaichang Di, Yexin Wang, et al. "A Photogrammetric-Photometric Stereo Method for High-Resolution Lunar Topographic Mapping Using Yutu-2 Rover Images." Remote Sensing 13, no. 15 (2021): 2975. http://dx.doi.org/10.3390/rs13152975.

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Topographic products are important for mission operations and scientific research in lunar exploration. In a lunar rover mission, high-resolution digital elevation models are typically generated at waypoints by photogrammetry methods based on rover stereo images acquired by stereo cameras. In case stereo images are not available, the stereo-photogrammetric method will not be applicable. Alternatively, photometric stereo method can recover topographic information with pixel-level resolution from three or more images, which are acquired by one camera under the same viewing geometry with differen

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Seo, Kyeongeun, Hyeonjoong Cho, Daewoong Choi, and Taewook Heo. "Stereo Feature Learning Based on Attention and Geometry for Absolute Hand Pose Estimation in Egocentric Stereo Views." IEEE Access 9 (2021): 116083–93. http://dx.doi.org/10.1109/access.2021.3105969.

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Unsinn, Andreas, Cora Dunst, and Paul Knochel. "Stereoselective synthesis of tetrasubstituted alkenes via a sequential carbocupration and a new sulfur–lithium exchange." Beilstein Journal of Organic Chemistry 8 (December 18, 2012): 2202–6. http://dx.doi.org/10.3762/bjoc.8.248.

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We have designed a new sequential carbocupration and sulfur–lithium exchange that leads stereo- and regioselectively to trisubstituted alkenyllithiums. Subsequent trapping with various electrophiles yields tetrasubstituted olefins with good control of the double-bond geometry (E/Z ratio up to 99:1). The novel sulfur–lithium exchange could be extended to the stereoselective preparation of Z-styryl lithium derivatives with almost complete retention of the double-bond geometry.

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Piermattei, Livia, Mauro Marty, Wilfried Karel, et al. "Impact of the Acquisition Geometry of Very High-Resolution Pléiades Imagery on the Accuracy of Canopy Height Models over Forested Alpine Regions." Remote Sensing 10, no. 10 (2018): 1542. http://dx.doi.org/10.3390/rs10101542.

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This work focuses on the accuracy estimation of canopy height models (CHMs) derived from image matching of Pléiades stereo imagery over forested mountain areas. To determine the height above ground and hence canopy height in forest areas, we use normalised digital surface models (nDSMs), computed as the differences between external high-resolution digital terrain models (DTMs) and digital surface models (DSMs) from Pléiades image matching. With the overall goal of testing the operational feasibility of Pléiades images for forest monitoring over mountain areas, two questions guide this work who

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Carr, James L., Dong L. Wu, Mariel D. Friberg, and Tyler C. Summers. "Multi-LEO Satellite Stereo Winds." Remote Sensing 15, no. 8 (2023): 2154. http://dx.doi.org/10.3390/rs15082154.

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The stereo-winds method follows trackable atmospheric cloud features from multiple viewing perspectives over multiple times, generally involving multiple satellite platforms. Multi-temporal observations provide information about the wind velocity and the observed parallax between viewing perspectives provides information about the height. The stereo-winds method requires no prior assumptions about the thermal profile of the atmosphere to assign a wind height, since the height of the tracked feature is directly determined from the viewing geometry. The method is well developed for pairs of Geos

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Luo, Kai, Yakun Ju, Lin Qi, Kaixuan Wang, and Junyu Dong. "RMAFF-PSN: A Residual Multi-Scale Attention Feature Fusion Photometric Stereo Network." Photonics 10, no. 5 (2023): 548. http://dx.doi.org/10.3390/photonics10050548.

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Predicting accurate normal maps of objects from two-dimensional images in regions of complex structure and spatial material variations is challenging using photometric stereo methods due to the influence of surface reflection properties caused by variations in object geometry and surface materials. To address this issue, we propose a photometric stereo network called a RMAFF-PSN that uses residual multiscale attentional feature fusion to handle the “difficult” regions of the object. Unlike previous approaches that only use stacked convolutional layers to extract deep features from the input im

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Feng, Weiwu, Qiang Li, Wenxue Du, and Dongsheng Zhang. "Remote 3D Displacement Sensing for Large Structures with Stereo Digital Image Correlation." Remote Sensing 15, no. 6 (2023): 1591. http://dx.doi.org/10.3390/rs15061591.

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The work performance of stereo digital image correlation (stereo-DIC) technologies, especially the operating accuracy and reliability in field applications, is not fully understood. In this study, the key technologies of the field remote 3D displacement sensing of civil structures based on stereo-DIC have been proposed. An image correlation algorithm is incorporated in improving the matching accuracy of control points. An adaptive stereo-DIC extrinsic parameter calibration method is developed by fusing epipolar-geometry-based and homography-based methods. Furthermore, a reliable reference fram

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Lee, Hae-Yeoun, Taejung Kim, Wonkyu Park, and Heung Kyu Lee. "Extraction of digital elevation models from satellite stereo images through stereo matching based on epipolarity and scene geometry." Image and Vision Computing 21, no. 9 (2003): 789–96. http://dx.doi.org/10.1016/s0262-8856(03)00092-1.

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