A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf.
Filters
The Distribution of Bright and Dark Material on Ganymede in Relationship to Surface Elevation and Slopes
1999
Icarus (New York, N.Y. 1962)
Preserved Fulltext
These prominent lineaments represent areas covered by bright and dark albedo material, not effects of photometric shading. ...
The unique high-resolution digital terrain data set available for Ganymede's Uruk Sulcus area and Galileo Regio is analyzed by quantitative image analysis techniques to identify relationships between surface ...
Scholten, and F. Oschütz (all at DLR), who provided important software contributions to this study. R. Kirk (USGS) gave a thorough review to an earlier version of the manuscript. ...
doi:10.1006/icar.1999.6143
fatcat:wo2cd2p45va33p5kttqczv56ru
Towards Efficient and Compact Phenomenological Representation of Arbitrary Bidirectional Surface Reflectance
2011
Procedings of the British Machine Vision Conference 2011
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2019; you can also visit the original URL.
The file type is application/pdf.
basis, while avoiding the high computational complexity inherited from such polynomials. ...
We provide an analytical analysis and experimental justification that for a given approximation order, our proposed hemispherical basis provide better approximation accuracy when compared to Zernike-based ...
We believe that our BRDF representation can be used in place of simple Lambertian models in algorithms such as shape-from-shading and photometric stereo. ...
doi:10.5244/c.25.89
dblp:conf/bmvc/ElhabianRF11
fatcat:lwncttl3cfhopdlsua2wjut5zu
Noise Reduction in Surface Reconstruction from a Given Gradient Field
2004
International Journal of Computer Vision
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
We first analyze the error sources in the recovered gradient field of a surface using a three-image photometric stereo method. ...
Furthermore, the experiments using noisy photometric stereo image triplets of real range data suggest that the additive model remains viable after the nonlinear photometric stereo operation to provide ...
Methods for reconstructing a three-dimensional surface topography from one or more brightness images are referred as "shape-from-shading" methods (Deift and Sylvester, 1981; Horn and Brooks, 1989; Hurt ...
doi:10.1023/b:visi.0000027788.50090.b6
fatcat:nzdxszjufrfsbca7j55fkykio4
Photometric Stereo by UV-Induced Fluorescence to Detect Protrusions on Georgia O'Keeffe's Paintings
[article]
2017
arXiv
pre-print
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
Since the presence of these protrusions raises questions about the state of conservation and long-term prospects for deterioration of these artworks, a 3D-imaging technique, photometric stereo using ultraviolet ...
illumination, was developed for the long-term monitoring of the surface-shape of the protrusions and the surrounding paint. ...
color generated by the UV induced fluorescence of the surface with underling contrast from shape removed. ...
arXiv:1711.08103v1
fatcat:a3nmoj45vjaublzmoaog4qpnoa
Optimal illumination directions for faces and rough surfaces for single and multiple light imaging using class-specific prior knowledge
2014
Computer Vision and Image Understanding
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
The methods are applicable both to single image/single illumination direction imaging and to photometric stereo imaging. ...
This paper uses class-specific prior knowledge, where the distribution of the normals of the class of surfaces is used in the optimisation. ...
object shapes from multiple images, in which 3D surfaces were approximated by Legendre polynomials. ...
doi:10.1016/j.cviu.2014.01.012
fatcat:n4b44pysfvbghkmfb6if33ycvq
Efficient robust image interpolation and surface properties using polynomial texture mapping
2014
EURASIP Journal on Image and Video Processing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2015; you can also visit the original URL.
The file type is application/pdf.
PTM is an extension of the classical photometric stereo (PST), replacing the simple Lambertian model employed by the latter with a polynomial one. ...
Polynomial texture mapping (PTM) uses simple polynomial regression to interpolate and re-light image sets taken from a fixed camera but under different illumination directions. ...
In [34] , a HSH basis derived from SH using shifted associated Legendre polynomials was proposed. ...
doi:10.1186/1687-5281-2014-25
fatcat:3sghvw5bvnfltdhnzjpl6zcori
MODELING ILLUMINATION VARIATION WITH SPHERICAL HARMONICS
[chapter]
2006
Face Processing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
This work was supported in part by grants #0305322, #0430258 and #0446916 from the National Science Foundation and from Intel Corporation.
Bibliography ...
Acknowledgements: Special thanks to all my co-authors and collaborators, with particular gratitude to Pat Hanrahan, David Jacobs, Ronen Basri and Ren Ng. ...
For instance, in computer vision, we can obtain the shape of an object to build 3D models using well known and well studied techniques like photometric stereo, stereo, or structure from motion. ...
doi:10.1016/b978-012088452-0/50013-3
fatcat:oxc3zbrxojdbpnkglh4leu7zt4
Generalizing Lambert's Law for smooth surfaces
[chapter]
1996
Lecture Notes in Computer Science
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2020; you can also visit the original URL.
The file type is application/pdf.
computer vision technique that may utilize reflectance models including shape-from-shading and binocular stereo. ...
Contrary to prediction by Lambert's Law, diffuse reflection from smooth surfaces is significantly viewpoint dependent, and there are prominent diffuse reflection maxima effects occurring on objects when ...
to photometric stereo. ...
doi:10.1007/3-540-61123-1_126
fatcat:7k57slo3fvfq7h3jsazb2lrq2a
Face Recognition Using 3-D Models: Pose and Illumination
2006
Proceedings of the IEEE
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
The 3-D Morphable Model was introduced as a generative model to predict the appearances of an individual while using a statistical prior on shape and texture allowing its parameters to be estimated from ...
Recently, advances in modeling the effects of illumination and pose have been accomplished using threedimensional (3-D) shape information coupled with reflectance models. ...
In this experiment, typically six frontally illuminated images were used to estimate the shape and albedos using photometric stereo techniques. ...
doi:10.1109/jproc.2006.886019
fatcat:vbr525mr5zhptoms2xvibcgvvy
Single Image Object Modeling Based on BRDF and r-Surfaces Learning
2016
2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2016; you can also visit the original URL.
The file type is application/pdf.
A methodology for 3D surface modeling from a single image is proposed. The principal novelty is concave and specular surface modeling without any externally imposed prior. ...
The main idea of the method is to use BRDFs and generated rendered surfaces, to transfer the normal field, computed for the generated samples, to the unknown surface. ...
Acknowledgments Supported by the EU FP7 TRADR (609763) and the EU H2020 SecondHands (643950) projects. We thank the anonymous reviewers for their insightful comments. ...
doi:10.1109/cvpr.2016.478
dblp:conf/cvpr/NatolaNPS16
fatcat:byb3i25icfdmrhh7yyizznnhza
ON THE EFFECT OF ILLUMINATION AND FACE RECOGNITION
[chapter]
2006
Face Processing
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
In the process, we also provide a brief survey on these new face recognition algorithms, discussing their details, implementations and performances. 7 Here we effectively approximate a smooth surface normals ...
However, only in the past few years, with the emergence of a wealth of new ideas and insights, a systematic and principled approach to illumination modelling has become possible. ...
[12] In this algorithm, surface normals and albedos of the face are recovered using photometric stereo techniques [5] [36] , and the 3D shape of the face is obtained by integrating the normal vector ...
doi:10.1016/b978-012088452-0/50012-1
fatcat:eslhglti2ffb5f3xf3onmoyoa4
Inverse Rendering of Faces with a 3D Morphable Model
2013
IEEE Transactions on Pattern Analysis and Machine Intelligence
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
We start by recovering 3D shape using a novel algorithm which incorporates generalisation errors of the model obtained from empirical measurements. ...
By decomposing the image formation process into a geometric and photometric part, we are able to state the problem as a multilinear system which can be solved accurately and efficiently. ...
[95] used their few-to-many approach to recover a 3D model from a sample of training images using a variant of photometric stereo. ...
doi:10.1109/tpami.2012.206
pmid:23520253
fatcat:34x6ffbpkvdm3cqarqzjbk254u
Mars synthetic topographic mapping
1978
Icarus (New York, N.Y. 1962)
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
Then an attempt was made to adjust all of the data together by expanding the polynomial using the Legendre expansion to the fourth degree and fourth order with 25 unknown coefficients used to define the ...
The Reduced Data Records (RDR) version, which has geometric and photometric distortions removed, are used for stereo photogrammetric work. ...
doi:10.1016/0019-1035(78)90182-3
fatcat:kvoazbru7vfljkv5eemihkixcy
Solar System remote sensing
2005
Icarus (New York, N.Y. 1962)
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Mail order requestors will be invoiced for the cost of shipping and handling. ...
Acknowledgments:
Acknowledgments: This study was supported by INTAS grant # 2000-0792. ...
Our objective is to represent scattering by each of these separate populations using simple functional forms such as Henyey-Greenstein functions or Legendre polynomials. ...
doi:10.1016/j.icarus.2004.10.001
fatcat:fy4kzwgylreq3pfayocbqked34
Earth-Based Visible and Near-IR Imaging of Mercury
2007
Space Science Reviews
Preserved Fulltext
A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2017; you can also visit the original URL.
The file type is application/pdf.
., HST) cannot be used at angular distances close to the Sun, advanced ground-based astronomical techniques and modern analytical and software can be used to obtain the resolved images of the poorly known ...
We present the observational method, the data analysis approach, the resulting images and obtained properties of the Mercury's surface. L. Ksanfomality ( ) · E. Petrova · I. Veselovsky ...
They are: ω = 0.25, θ = 20 • , P (α) = 1 + 0.579P 1 + 0.367P 2 (where P 1 and P 2 are the first and second Legendre polynomials, respectively). ...
doi:10.1007/s11214-007-9290-3
fatcat:6o7lm3ij2ngmziqjgqf6eiqxsy
« Previous
Showing results 1 — 15 out of 36 results