18,500 Hits in 6.3 sec

Direct Ground Surface Reconstruction from Stereo Images

Shigeki Sugimoto, Takaaki Kato, Kouma Motooka, Masatoshi Okutomi
2013 IPSJ Transactions on Computer Vision and Applications  
We propose a method for directly estimating a square grid ground surface from stereo images.  ...  We estimate the heights of all vertices in a square mesh, in which each square is divided into two triangular patches, drawn on a level plane of the ground, from a pair of images captured by nearly front-looking  ...  Acknowledgments This work was partly supported by Grant-in-Aid for Scientific Research (21240015) from the Japan Society for the Promotion of Science.  ... 
doi:10.2197/ipsjtcva.5.60 fatcat:buiivjvzineqpovecknveomg4u

Bias Correction in Photometric Stereo using Control Points

Israel Horovitz, Nahum Kiryati
2001 International Symposium on Vision, Modeling, and Visualization  
Photometric stereo is capable of high quality reconstruction of fine shape details.  ...  One is based on constrained weighted-least squares extension to shape from needle-diagram computation. The other adds an interpolation surface to the reconstructed shape.  ...  Shape from normal directions Given a needle diagram (p,q)¡ within some image domain ¢ , Horn and Brooks [6] propose to reconstruct the surface £ ¤ ¦ ¨ using the calculus of variations, minimizing the  ... 
dblp:conf/vmv/HorovitzK01 fatcat:we4wz4237ratlmftsskzzq3lva

Direct Generation of Regular-Grid Ground Surface Map from In-Vehicle Stereo Image Sequences

Shigeki Sugimoto, Kouma Motooka, Masatoshi Okutomi
2013 2013 IEEE International Conference on Computer Vision Workshops  
We propose a direct method for incrementally estimating a regular-grid ground surface map from stereo image sequences captured by nearly front-looking stereo cameras, taking illumination changes on all  ...  We first develop a stereo ground surface reconstruction method where the stability is effectively improved by the combinational use of three complementary techniques, the use of a smoothness term, update  ...  Acknowledgement This work was partially supported by the Grants-in-Aid for Scientific Research (No. 25240025) from the Japan Society for the Promotion of Science.  ... 
doi:10.1109/iccvw.2013.83 dblp:conf/iccvw/SugimotoMO13 fatcat:gqhxfvrvz5dlvjzzkup2nypupy

A Benchmarking Dataset for Performance Evaluation of Automatic Surface Reconstruction Algorithms

Anke Bellmann, Olaf Hellwich, Volker Rodehorst, Ulas Yilmaz
2007 2007 IEEE Conference on Computer Vision and Pattern Recognition  
In this paper we propose a comprehensive benchmarking dataset for evaluating a variety of automatic surface reconstruction algorithms (shape-from-X) and a methodology for comparing their results.  ...  Numerous techniques were invented in computer vision and photogrammetry to obtain spatial information from digital images.  ...  Berlin) and Joachim Oberfell (MICOS GmbH, Würselen) for supplying the Pollux turntable and supporting us, as well as Daniel Scharstein (Middlebury College, Vermont USA) for valuable hints and various test images  ... 
doi:10.1109/cvpr.2007.383349 dblp:conf/cvpr/BellmannHRY07 fatcat:kqxenagipvaoxmhpxb3h4lbzui

Enhanced Photometric Stereo with Multispectral Images

Tsuyoshi Takatani, Yasuyuki Matsushita, Stephen Lin, Yasuhiro Mukaigawa, Yasushi Yagi
2013 IAPR International Workshop on Machine Vision Applications  
We merge reconstruction results from different wavelengths to produce the final surface normal map.  ...  Many photometric stereo algorithms assume Lambertian reflectance, but deviations from this ideal produce errors in shape reconstruction.  ...  Images were recorded under twelve different lighting directions. We applied photometric stereo to the images under perspective projection [16] to estimate the surface normals.  ... 
dblp:conf/mva/TakataniMLMY13 fatcat:zf55sltwvjhkdc3p27tdpotzsm

An Evaluation of Three Popular Computer Vision Approaches for 3-D Face Synthesis [chapter]

Alexander Woodward, Da An, Yizhe Lin, Patrice Delmas, Georgy Gimel'farb, John Morris
2006 Lecture Notes in Computer Science  
An integrated experimental environment simultaneously acquired images for 3-D reconstruction and data from a 3-D scanner which provided an accurate ground truth.  ...  We have evaluated three computer approaches to 3-D reconstruction -passive computational binocular stereo and active structured lighting and photometric stereo -in regard to human face reconstruction for  ...  the image dimensions, n i,j and n * i,j are the reconstructed surface and ground truth normals, respectively, and "•" is the dot product operator.  ... 
doi:10.1007/11815921_29 fatcat:6zcpfkpbb5gzjnjq376dkjz4zy

3D Scene Reconstruction from Multiple Spherical Stereo Pairs

Hansung Kim, Adrian Hilton
2013 International Journal of Computer Vision  
Reconstruction is based on stereo image pairs with a vertical displacement between camera views. A 3D mesh model for each pair of spherical images is reconstructed by stereo matching.  ...  Performance of the proposed algorithm is evaluated against ground-truth from the Middlebury stereo test bed and LIDAR scans.  ...  Fig. 17 17 Reconstructed models (Left: Ground-truth by LIDAR scan, Middle: Reconstruction from a single stereo pair, Right: Reconstruction from multiple spherical stereo pairs) Fig. 18 18 Depth errors  ... 
doi:10.1007/s11263-013-0616-1 fatcat:mbk53thqwzbvrjkkqh6pvx4pc4

A Comparison of Three 3-D Facial Reconstruction Approaches

Alexander Woodward, Da An, Georgy Gimel`farb, Patrice Delmas
2006 2006 IEEE International Conference on Multimedia and Expo  
An integrated lab environment was set up to simultaneously acquire images for 3-D reconstruction and corresponding data from a 3-D scanner.  ...  This allowed us to quantitatively compare reconstruction results to accurate ground truth.  ...  the image dimensions, n i,j and n * i,j are the reconstructed surface and ground truth normals, respectively, and "•" denotes the dot product of two vectors.  ... 
doi:10.1109/icme.2006.262619 dblp:conf/icmcs/WoodwardAGD06 fatcat:koq7ahqx2repjm3zlwomuxmfpe

Removing the Example from Example-Based Photometric Stereo [chapter]

Jens Ackermann, Martin Ritz, André Stork, Michael Goesele
2012 Lecture Notes in Computer Science  
Similar to the standard approach, we then transfer normals from reconstructed to unreconstructed regions based on robust photometric matching.  ...  Instead, we use a robust multi-view stereo technique to create a partial reconstruction of the scene which serves as sceneintrinsic reference geometry.  ...  Given three images of a diffuse surface from the same viewpoint, it is possible to determine the surface normal unless the illumination directions are coplanar.  ... 
doi:10.1007/978-3-642-35740-4_16 fatcat:7xbj3qb6lnfzja4miyhqwjd37i


E. Simioni, C. Re, T. Mudric, A. Pommerol, N. Thomas, G. Cremonese
2017 The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences  
Despite of the eccentricity of this first orbit, CaSSIS has provided one stereo pair with a mean ground resolution of 6 m from a mean distance of 520 km.  ...  CaSSIS (Colour and Stereo Surface Imaging System) is the stereo imaging system onboard the European Space Agency and ROSCOSMOS ExoMars Trace Gas Orbiter (TGO) that has been launched on 14 March 2016 and  ...  CONCLUSIONS A photogrammetric stereo processing workflow has been proposed for the 3D reconstruction from CaSSIS images.  ... 
doi:10.5194/isprs-archives-xlii-3-w1-133-2017 fatcat:5irjkdrofzekbkr7nwynqqzvn4

Reconstructing High Quality Face-Surfaces using Model Based Stereo

Brian Amberg, Andrew Blake, Andrew Fitzgibbon, Sami Romdhani, Thomas Vetter
2007 2007 IEEE 11th International Conference on Computer Vision  
Contribution We present a method to fit a detailed 3D morphable model to multiple images.  ...  The cost function employs The model shape prior A small number of landmarks for initialization A monocular silhouette distance cost A stereo colour cost  ...  Directed Lighting Input Images Multiview Ground Truth Monocular Input Images Multiview Ground Truth Monocular The new stereo algorithm is robust under directed lighting and yields significantly more accurate  ... 
doi:10.1109/iccv.2007.4408998 dblp:conf/iccv/AmbergBFRV07 fatcat:4wo254ycazdqvksnjp7ut2wgwq

Multispectral Photometric Stereo for Acquiring High-Fidelity Surface Normals

Giljoo Nam, Min H. Kim
2014 IEEE Computer Graphics and Applications  
An advanced imaging technique of multispectral imaging has become more accessible as a physically-meaningful image-based measurement tool, and photometric stereo has been commonly practiced for digitizing  ...  Reconstructing the shape of a 3D object using photometric stereo is still challenging due to the optical phenomena such as indirect illumination, specular reflection, self shadow.  ...  Removing Interreflection in Photometric Stereo Photometric stereo, known as shape-from-shading, estimates surface gradients using images taken under multiple light directions, assuming that the surface  ... 
doi:10.1109/mcg.2014.108 pmid:25216479 fatcat:2fm7focvnfcxdhjthhuoflxxoa

Photometric Stereo-Based Depth Map Reconstruction for Monocular Capsule Endoscopy

Yang Hao, Jing Li, Fei Meng, Peisen Zhang, Gastone Ciuti, Paolo Dario, Qiang Huang
2020 Sensors  
To evaluate the precision of the depth estimation of the specular highlight region and the depth map reconstruction of the object surface, simulations and experiments are implemented with synthetic images  ...  To improve the depth perception of the monocular capsule endoscopy robot, this paper proposes a photometric stereo-based depth map reconstruction method.  ...  Second, to reconstruct the depth map of the whole object surface with photometric stereo, the ground truth of the depth of at least one object surface point is needed to serve as a boundary condition.  ... 
doi:10.3390/s20185403 pmid:32967182 pmcid:PMC7571214 fatcat:l2sdgzch45gxjkxb52rb5cx3ae

Three-Dimensional Reconstruction from Single Image Base on Combination of CNN and Multi-Spectral Photometric Stereo

Liang Lu, Lin Qi, Yisong Luo, Hengchao Jiao, Junyu Dong
2018 Sensors  
Multi-spectral photometric stereo can recover pixel-wise surface normal from a single RGB image.  ...  Since high-resolution ground-truth data is expensive to obtain, we designed a network and trained it with rendered images of synthetic 3D objects.  ...  We use CNN to estimate the coarse depth from a single image, and then input it as an initialization input to photometric stereo for finer surface details.  ... 
doi:10.3390/s18030764 pmid:29498703 pmcid:PMC5876863 fatcat:tqvxu7dh2bhatpxncu6iyawomm

Multiview Photometric Stereo

Carlos Hernandez Esteban, George Vogiatzis, Roberto Cipolla
2008 IEEE Transactions on Pattern Analysis and Machine Intelligence  
This is then used to recover the illumination and initialise a multi-view photometric stereo scheme to obtain a closed surface reconstruction.  ...  A number of images of the object are obtained from multiple viewpoints, under varying lighting conditions.  ...  The model obtained by our algorithm was compared to the ground truth surface by measuring the distance of each point on our model from the closest point in the ground truth model.  ... 
doi:10.1109/tpami.2007.70820 pmid:18195448 fatcat:a362clhlbjedrk324l4sfdlziy
« Previous Showing results 1 — 15 out of 18,500 results