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Acquisition and Rectification of Shape Data Obtained by a Moving Range Sensor
2007
IPSJ Digital Courier
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To test these methods, we have conducted a digital archiving project of a large-scale heritage object, in which our algorithms are applied. The results show the effectiveness of our methods. ...
The obtained data, however, have some distortions due to movement of the system during the scanning process. ...
) The minimization of F A leads to the correct tracking of fixed interest points by a moving camera. ...
doi:10.2197/ipsjdc.3.424
fatcat:rvklki33kjenhjka2oirpbxgvq
Image Preprocessing for Outdoor Luminescence Inspection of Large Photovoltaic Parks
2021
Energies
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After lens distortion correction and perspective correction, we analyze the residual deviation between ideal target grid points and the previously detected CGJ after applied distortion and perspective ...
However, such a precise analysis requires image corrections and calibrations, because vignetting and lens distortion cause signal and spatial distortions. ...
We would like to thank rer. nat. habil Jürgen Werner and Ing. Bin Yang for the critical review of the paper. We would like to offer our special thanks to Ing. ...
doi:10.3390/en14092508
doaj:d81b0359242b4da38a5d0e0c47275eef
fatcat:uc2xtl53wbaytk5fbizpjccjtq
DisCO: Portrait Distortion Correction with Perspective-Aware 3D GANs
[article]
2023
arXiv
pre-print
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We propose a simple yet effective method for correcting perspective distortions in a single close-up face. ...
We first perform GAN inversion using a perspective-distorted input facial image by jointly optimizing the camera intrinsic/extrinsic parameters and face latent code. ...
Perspective-aware 3D GAN Inversion Correcting the perspective distortion of a single close-up face portrait requires manipulation of its camera-to-subject distance. ...
arXiv:2302.12253v3
fatcat:zjocjfsywra65f4yzuad2poozq
Practical Wide-Angle Portraits Correction with Deep Structured Models
[article]
2021
arXiv
pre-print
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2021 pre-print arXiv:2104.12464v2 fatcat:ackp6uuzyzfnpe4n4dbljerzyiOther Versions
Compared to the previous state-of-the-art approach, our method does not require camera distortion parameters. ...
Specifically, given a wide-angle portrait as input, we build a cascaded network consisting of a LineNet, a ShapeNet, and a transition module (TM), which corrects perspective distortions on the background ...
Compared with calibration-based opponents, our method can rectify the faces faithfully without camera parameters. ...
arXiv:2104.12464v3
fatcat:hvr22dmsurcq3nkaksqmxlxxxq
A Calibration Method for Large-Scale Projection Based Floor Display System
2018
2018 IEEE Conference on Virtual Reality and 3D User Interfaces (VR)
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In our system, multiple projectors are installed on the ceiling of a large indoor space like a gymnasium to achieve a large projection area on the floor. ...
The projection results suffer from both perspective distortion and lens distortion. ...
CALIBRATION METHOD Camera lens distortion correction: Basing on "straight lines have to be straight", the optimal lens distortion parameters can be found by minimizing the degree of distortion of straight ...
doi:10.1109/vr.2018.8446433
dblp:conf/vr/XieSKSK18
fatcat:jbz7myluf5ctbben753ghh3dui
A Master-Slave Surveillance System to Acquire Panoramic and Multiscale Videos
2014
The Scientific World Journal
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In addition, a distortion correction method based on Midpoint Circle Algorithm is proposed to handle obvious horizontal distortion in the captured panoramic image. ...
In this system, the fish-eye panoramic camera is capable of monitoring a large area, and the PTZ dome camera has high mobility and zoom ability. ...
The distortion in Figure 9 (a) is corrected in a small scale without any obvious noticeability. ...
doi:10.1155/2014/491549
pmid:24729750
pmcid:PMC3960552
fatcat:av7rsphdcvhfhkv2eukhgej7oy
Shape Rectification of 3D Data Obtained by a Moving Range Sensor by using Image Sequences
[chapter]
2008
Digitally Archiving Cultural Objects
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The obtained data, however, have some distortion due to movement during the scanning process. Then we propose a novel method to rectify the shape data obtained by a moving range sensor. ...
For a large object, scanning from the air is one of the most efficient methods of obtaining 3D data. ...
Acknowledgments This research was supported, in part, by Ministry of Education, Culture, Sports, Science and Technology under the Leading Project, "Development of High Fidelity Digitization Software for ...
doi:10.1007/978-0-387-75807_2
fatcat:nd5wlomuwba7nozh2j5nnjn2ta
Motion estimation of a moving range sensor by image sequences and distorted range data
2005
2005 IEEE/RSJ International Conference on Intelligent Robots and Systems
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At first, the initial values of camera motion parameters are estimated by perspective factorization. ...
Using image sequences from a video camera mounted on the FLRS enables us to estimate the motion of the FLRS without any physical sensors such as gyros and GPS. ...
and Intangible Cultural Assets", Japan Science and Technology Corporation(JST) and Research Fellowships of Japan Society for the Promotion of Science(JSPS) for Young Scientists. ...
doi:10.1109/iros.2005.1545600
dblp:conf/iros/BannoHI05
fatcat:afvr7euhjrbvzghhjozoncwjle
Learning Perspective Undistortion of Portraits
[article]
2019
arXiv
pre-print
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In contrast to the previous state-of-the-art approach, our method handles even portraits with extreme perspective distortion, as we avoid the inaccurate and error-prone step of first fitting a 3D face ...
Instead, we predict a distortion correction flow map that encodes a per-pixel displacement that removes distortion artifacts when applied to the input image. ...
With carefully geometry and color calibration, the two hardware-synced cameras were able to capture nearly ground truth portraits pairs of real subjects both with and without perspective distortions. ...
arXiv:1905.07515v1
fatcat:jf4rowbilndyvjy3uq7q37byre
Orthorectification of Fisheye Image under Equidistant Projection Model
2022
Remote Sensing
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To verify the proposed method, high accuracy of the fisheye camera 3D calibration field is established to obtain the interior and exterior orientation parameters (IOPs/EOPs) and distortion parameters of ...
However, a fisheye image contains large distortion, resulting in that many scholars have investigated its accuracy of orthorectification, i.e., generation of digital orthophoto map (DOM). ...
the corrections of the IOPs of the fisheye camera, and s represents the corrections of the distortion parameters of the fisheye camera. ...
doi:10.3390/rs14174175
fatcat:7wt7ra5sujfdhd4ijalabgir7u
Camera Matrix Calibration Using Circular Control Points and Separate Correction of the Geometric Distortion Field
2014
2014 Canadian Conference on Computer and Robot Vision
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We achieve a precise camera calibration using circular control points by, first, separation of the lens distortion parameters from other camera parameters and computation of the distortion field in advance ...
Combined with precise keypoint detection, the approach is shown to be more stable than current state-of-the-art global calibration method. ...
ACKNOWLEDGMENT Part of this work was funded by the Agence Nationale de la Recherche (ANR), project STEREO (program ASTRID 2012). ...
doi:10.1109/crv.2014.34
dblp:conf/crv/RudakovaM14
fatcat:5fugvh4hznfk3fvklyulqi3sqm
Zolly: Zoom Focal Length Correctly for Perspective-Distorted Human Mesh Reconstruction
[article]
2023
arXiv
pre-print
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We propose a new camera model and a novel 2D representation, termed distortion image, which describes the 2D dense distortion scale of the human body. ...
context, which can not tackle the problem of the torso, limb, hand or face distortion caused by perspective camera projection when the camera is close to the human body. ...
learning-based method to tackle the perspective-distorted 3DHMR task without relying on extra camera information. ...
arXiv:2303.13796v3
fatcat:e7unxuacznd33aociu7kef5are
Driver Assistance System Providing an Intuitive Perspective View of Vehicle Surrounding
[chapter]
2015
Lecture Notes in Computer Science
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We developed a simple and accurate fisheye camera calibration method to dewarp the captured images into perspective projection ones. ...
Next, we estimated the intrinsic parameters of each undistorted virtual camera by using planar calibration patterns and then obtain the extrinsic camera parameters by using the global patterns on a ground ...
Correction of Image Distortion and Estimation of Intrinsic Parameters This section describes the proposed methods of camera calibration and image dewarping. ...
doi:10.1007/978-3-319-16631-5_30
fatcat:rczfwy2innbvjcvwgabh34tztu
F2BEV: Bird's Eye View Generation from Surround-View Fisheye Camera Images for Automated Driving
[article]
2023
arXiv
pre-print
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However, generating BEVs from surround-view fisheye camera images is challenging due to the strong distortions introduced by such wide-angle lenses. ...
F2BEV consists of a distortion-aware spatial cross attention module for querying and consolidating spatial information from fisheye image features in a transformer-style architecture followed by a task-specific ...
ACKNOWLEDGMENT We acknowledge the contributions of Zhipeng Liu, John Nousiainen, Chihiro Suga, and Jeremy White in building the simulated environment for generating the FB-SSEM dataset. ...
arXiv:2303.03651v2
fatcat:wbh7ya27azf65hcdepj2at4xdy
Incremental, orthorectified and loop-independent mosaicking of aerial images taken by micro UAVs
2011
2011 IEEE International Symposium on Robotic and Sensors Environments (ROSE)
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We investigate the influences of using a depth map to find the features from the same plane, geometric distortion correction and combining the appropriate choice of projection and transformation model ...
Mostly the UAV aerial image mosaicking is affected by the following three important sources of error: i) a weak homography as a result of using unleveled ground control points (GCPs) for image registration ...
Choosing the planar model demands a projective transformation to correct the perspective distortion of images taken while the camera was tilted. ...
doi:10.1109/rose.2011.6058531
dblp:conf/rose/YahyanejadQR11
fatcat:hxy5ezwsk5agxowzupmljcwfbe
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