The environmental dependence of the stellar mass-size relation in STAGES galaxies (2009)
Maltby, David T., Aragón-Salamanca, Alfonso, Gray, Meghan E., Barden, Marco, Haeussler, Boris, Wolf, Christian, ...
We present the stellar mass-size relations for elliptical, lenticular, and spiral galaxies in the field and cluster environments using HST/ACS imaging and data from the Space Telescope A901/2 Galaxy...
Robaina, Aday R., Bell, Eric F., Skelton, Rosalind E., McIntosh, Daniel H., Somerville, Rachel S., Zheng, Xianzhong, ...
Both observations and simulations show that major tidal interactions or mergers between gas-rich galaxies can lead to intense bursts of starformation. Yet, the average enhancement in star formation...
Wolf, Christian, Aragón-Salamanca, Alfonso, Balogh, Michael, Barden, Marco, Bell, Eric F., Gray, Meghan E., ...
Galaxies migrate from the blue cloud to the red sequence when their star formation is quenched. Here, we report on galaxies quenched by environmental effects and not by mergers or strong AGN as often...
Bayesian photometric redshifts with empirical training sets (2009)
We combine in a single framework the two complementary benefits of chi^2-template fits and empirical training sets used e.g. in neural nets: chi^2 is more reliable when its probability density...
Jogee, Shardha, Miller, Sarah H., Penner, Kyle, Skelton, Rosalind E., Conselice, Christopher J., Somerville, Rachel S., ...
We perform a comprehensive estimate of the frequency of galaxy mergers and their impact on star formation over z~0.24--0.80 (lookback time T_b~3--7 Gyr) using 3698 (M*>=1e9 Msun) galaxies with GEMS...
On the distribution of periodic orbits (2009)
Gelfert, Katrin, Wolf, Christian
Let $f:M\to M$ be a $C^{1+\epsilon}$-map on a smooth Riemannian manifold $M$ and let $\Lambda\subset M$ be a compact $f$-invariant locally maximal set. In this paper we obtain several results...
Wolf, Christian, Aragon-Salamanca, Alfonso, Balogh, Michael, Barden, Marco, Bell, Eric F., Gray, Meghan E., ...
We investigate the properties of optically passive spirals and dusty red galaxies in the A901/2 cluster complex at redshift ~0.17 using restframe near-UV-optical SEDs, 24 micron IR data and HST...
STAGES: the Space Telescope A901/2 Galaxy Evolution Survey (2008)
Gray, M. E., Wolf, Christian, Barden, Marco, Peng, Chien Y., Haeussler, Boris, Bell, Eric F., ...
We present an overview of the Space Telescope A901/2 Galaxy Evolution Survey (STAGES). STAGES is a multiwavelength project designed to probe physical drivers of galaxy evolution across a wide range...
On type Ia supernovae and the formation of single low-mass white dwarfs (2008)
Justham, Stephen, Wolf, Christian, Podsiadlowski, Philipp, Han, Zhanwen
There is still considerable debate over the progenitors of type Ia supernovae (SNe Ia). Likewise, it is not agreed how single white dwarfs with masses less than ~0.5 Msun can be formed in the field,...
Supernova Shock Breakout from a Red Supergiant (2008)
Schawinski, Kevin, Justham, Stephen, Wolf, Christian, Podsiadlowski, Philipp, Sullivan, Mark, Steenbrugge, Katrien C., ...
Massive stars undergo a violent death when the supply of nuclear fuel in their cores is exhausted, resulting in a catastrophic "core-collapse" supernova. Such events are usually only detected at...
ERGODIC THEORY OF PARABOLIC HORSESHOES (2008)
Mariusz Urbański, Christian Wolf
Abstract. In this paper we develop the ergodic theory for a horseshoe map f which is uniformly hyperbolic, except at one parabolic fixed point ω and possibly also on W s (ω). We call f a parabolic...
Christian Wolf, Jean-michel Jolion, C. Wolf
Object count/area graphs for the evaluation of object detection and segmentation algorithms
POINTWISE DIMENSION AND ERGODIC DECOMPOSITIONS (2008)
Abstract. We study the Hausdorff dimension and the pointwise dimension of measures that are not necessarily ergodic. In particular, for conformal expanding maps and hyperbolic diffeomorphisms on...
Heymans, Catherine, Gray, Meghan E., Peng, Chien Y., Van Waerbeke, Ludovic, Bell, Eric F., Wolf, Christian, ...
We present a high resolution dark matter reconstruction of the z=0.165 Abell 901/902 supercluster from a weak lensing analysis of the HST STAGES survey. We detect the four main structures of the...
Inference and parameter estimation on belief networks for image segmentation (2008)
Wolf, Christian, Gavin, Gerald
Dans ce papier, on présente un nouveau réseau bayesien hiérarchique dédié à la segmentation d'images. Contrairement aux modèles classiques (e.g. le quad arbre), le graphe associé à ce...
Inference and parameter estimation on belief networks for image segmentation (2008)
Wolf, Christian, Gavin, Gerald
Dans ce papier, on présente un nouveau réseau bayesien hiérarchique dédié à la segmentation d'images. Contrairement aux modèles classiques (e.g. le quad arbre), le graphe associé à ce...
Seeking for the progenitors of type Ia supernovae (2008)
Patat, Ferdinando, Chandra, Poonam, Chevalier, Roger, Justham, Stephen, Podsiadlowski, Philipp, Wolf, Christian, ...
An explanation for the observed weak size evolution of disk galaxies (2008)
Somerville, Rachel S., Barden, Marco, Rix, Hans-Walter, Bell, Eric F., Beckwith, Steven V. W., Borch, Andrea, ...
Surveys of distant galaxies with the Hubble Space Telescope and from the ground have shown that there is only mild evolution in the relationship between radial size and stellar mass for galactic...
Supernova shock breakout from a red supergiant (2008)
Schawinski, Kevin, Justham, Stephen, Wolf, Christian, Podsiadlowski, Philipp, Sullivan, Mark, Steenbrugge, Katrien C., ...
Massive stars undergo a violent death when the supply of nuclear fuel in their cores is exhausted, resulting in a catastrophic ``core-collapse'' supernova. Such events are usually only detected at...
Heymans, Catherine, Gray, Meghan E., Peng, Chien Y., Van Waerbeke, Ludovic, Bell, Eric F., Wolf, Christian, ...
We present a high-resolution dark matter reconstruction of the z = 0.165 Abell 901/902 supercluster from a weak lensing analysis of the Hubble Space Telescope STAGES survey. We detect the four main...
GEMS survey data and catalog (2008)
Caldwell, John A. R., McIntosh, Daniel H., Rix, Hans-Walter, Barden, Marco, Beckwith, Steven V. W., Bell, Eric F., ...
We describe the data reduction and object cataloging for the GEMS survey, a large-area (800 arcmin2) two-band (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble...
An iterative graph cut optimization algorithm for a double MRF prior (2008)
In a previous publication we presented a double MRF model capable of separatly regularizing the recto and verso side of a document suffering from ink bleed through. In this paper we show that this...
An iterative graph cut optimization algorithm for a double MRF prior (2008)
In a previous publication we presented a double MRF model capable of separatly regularizing the recto and verso side of a document suffering from ink bleed through. In this paper we show that this...
Christian Wolf, Jean-michel Jolion, Walter Kropatsch, Horst Bischof
Interest point detectors are used in computer vision to detect image points with special properties, which can be geometric (corners) or non-geometric (contrast etc.). Gabor functions and Gabor...
Content based image retrieval is the task of searching images from a database, which are visually similar to a given example image. Since there is no general denition for visual similarity, there are...
Histograms for Texture based Image Retrieval (2007)
Christian Wolf, Jean-michel Jolion, Horst Bischof
: Content based image retrieval is the task of searching images from a database, which are visually similar to a given example image. Since there is no general definition for visual similarity, there...
Comm. Math. Phys., to appear. MEASURES OF MAXIMAL DIMENSION FOR HYPERBOLIC DIFFEOMORPHISMS (2007)
Abstract. We establish the existence of ergodic measures of maximal Hausdorff dimension for hyperbolic sets of surface diffeomorphisms. This is a dimension-theoretical version of the existence of...
POINTWISE DIMENSION AND ERGODIC DECOMPOSITIONS (2007)
Abstract. We study the Hausdorff dimension and the pointwise dimension of measures that are not necessarily ergodic. In particular, for conformal expanding maps and hyperbolic diffeomorphisms we...
Video Indexing and Retrieval for TREC 2002 (2007)
Christian Wolf, David Doermann
The goal of the TREC conference Video Retrieval Track is the investigation of content-based retrieval from digital video. We participated at the conference with a query and browsing system. For...
wolf(r fv.insa- lyon. fr (2007)
Christian Wolf, David Doermann, Mika Rautiainen, Mediateam Oulu
doermann(cfar.umd.edu
Christian Wolf, Jean-michel Jolion, Bât J. Verne
The systems currently available for content based image and video retrieval work without semantic knowledge, i.e. they use image processing methods to extract low level features of the data. The...
POINTWISE DIMENSION AND ERGODIC DECOMPOSITIONS (2007)
Abstract. We study the Hausdorff dimension and the pointwise dimension of measures that are not necessarily ergodic. In particular, for conformal expanding maps and hyperbolic diffeomorphisms we...
iWeaver: Towards 'Learning Style'-based e-Learning in Computer Science Education (2007)
Although learning style theory is widely accepted amongst educational theorists in the context of traditional classroom environments, there is still little research on the adaptation to individual...
Technical Report Pattern Recognition and Image Processing Group (2007)
Content based image retrieval is the task of searching images from a database, which are visually similar to a given example image. Since there is no general de nition for visual similarity, there...
The Star Formation and Extinction Co-Evolution of UV-Selected Galaxies over 0.05 (2007)
Martin, D. Christopher, Small, Todd, Schiminovich, David, Wyder, Ted K., Perez-Gonzales, Pablo G., Johnson, Benjamin, ...
We use a new stacking technique to obtain mean mid IR and far IR to far UV flux ratios over the rest near-UV/near-IR color-magnitude diagram. We employ COMBO-17 redshifts and COMBO-17 optical, GALEX...
Topological pressure for one-dimensional holomorphic dynamical systems (2007)
Gelfert, Katrin, Wolf, Christian
For a class of one-dimensional holomorphic maps f of the Riemann sphere we prove that for a wide class of potentials h the topological pressure is entirely determined by the values of h on the...
Star Formation and the Growth of Stellar Mass (2007)
Bell, Eric F., Zheng, Xian Zhong, Papovich, Casey, Borch, Andrea, Wolf, Christian, Meisenheimer, Klaus
Recent observations have demonstrated a significant growth in the integrated stellar mass of the red sequence since z=1, dominated by a steadily increasing number of galaxies with stellar masses M* <...
GEMS: Galaxy fitting catalogues and testing parametric galaxy fitting codes (2007)
Ler, Boris Häu\ss, McIntosh, Daniel H., Barden, Marco, Bell, Eric F., Rix, Hans-Walter, Borch, Andrea, ...
In the context of measuring structure and morphology of intermediate redshift galaxies with recent HST/ACS surveys, we tune, test, and compare two widely used fitting codes (GALFIT and GIM2D) for...
The dependence of Star Formation on Galaxy Stellar Mass (2007)
Zheng, Xian Zhong, Bell, Eric F., Papovich, Casey, Wolf, Christian, Meisenheimer, Klaus, Rix, Hans-Walter, ...
We combine Spitzer 24micron observations with data from the COMBO-17 survey for ~15,000 0.2
Untersuchungen zur Ausbildung hochgeordneter Strukturen in lamellaren Tensidphasen (2007)
Komplex aufgebaute äquidistante Lamellenflächen bilden in Systemen mit parabolischen Fokalkegeln hochsymmetrische Muster. Am Beispiel des Systems Natriumdodecylsulfat / Wasser / Hexanol / Dekan...
The dependence of star formation on galaxy stellar mass (2007)
Zheng, Xian Zhong, Bell, Eric F., Papovich, Casey, Wolf, Christian, Meisenheimer, Klaus, Rix, Hans-Walter, ...
We combine Spitzer 24 mum observations with data from the COMBO-17 survey for ~15,000 0.2
GEMS: galaxy fitting catalogs and testing parametric galaxy fitting codes: GALFIT and GIM2D (2007)
Häußler, Boris, McIntosh, Daniel H., Barden, Marco, Bell, Eric F., Rix, Hans-Walter, Borch, Andrea, ...
In the context of measuring the structures of intermediate-redshift galaxies with HST ACS surveys, we tune, test, and compare two widely used fitting codes (GALFIT and GIM2D) for fitting...
Star formation and the growth of stellar mass (2007)
Bell, Eric F., Zheng, Xian Zhong, Papovich, Casey, Borch, Andrea, Wolf, Christian, Meisenheimer, Klaus
Recent observations have demonstrated a significant growth in the integrated stellar mass of the red sequence since z=1, dominated by a steadily increasing number of galaxies with stellar masses M* <...
Eight billion years of disk galaxy evolution (2007)
Bell, Eric F., Barden, Marco, Zheng, Xianzhong, Papovich, Casey, Le Floc'h, Emeric, Rieke, George, ...
We present a brief discussion of the evolution of disk galaxy stellar masses, sizes, rotation velocities, and star formation rates over the last eight billion years. Recent observations have failed...
GEMS: the destiny of blue spheroidal galaxies (2007)
Häußler, Boris, Bell, Eric F., Barden, Marco, McIntosh, Daniel H., Rix, Hans-Walter, Borch, Andrea, ...
Not Available
Certification i Certification (2007)
(equivalent to BCompSc(Hons) Digital Media) This exegesis is submitted with the durable record of the project materials on DVD in fulfilment of the requirements for the degree Doctor of Philosophy.
An Explanation for the Observed Weak Size Evolution of Disk Galaxies (2006)
Somerville, Rachel S., Barden, Marco, Rix, Hans-Walter, Bell, Eric F., Beckwith, Steven V. W., Borch, Andrea, ...
Surveys of distant galaxies with the Hubble Space Telescope and from the ground have shown that there is only mild evolution in the relationship between radial size and stellar mass for galactic...
Cosmological Implications of the Second Parameter of Type Ia Supernovae (2006)
Podsiadlowski, Philipp, Mazzali, Paolo A., Lesaffre, Pierre, Wolf, Christian, Forster, Francisco
Theoretical models predict that the initial metallicity of the progenitor of a Type Ia supernova (SN Ia) affects the peak of the supernova light curve. This can cause a deviation from the standard...
Bayesian Photometric Redshifts for Weak Lensing Applications (2006)
Edmondson, Edward, Miller, Lance, Wolf, Christian
The next generation of weak gravitational lensing surveys is capable of generating good measurements of cosmological parameters, provided that, amongst other requirements, adequate redshift...
The metallicity dependence of the long-duration GRB rate from host galaxy luminosities (2006)
Wolf, Christian, Podsiadlowski, Philipp
We investigate the difference between the host galaxy properties of core-collapse supernovae and long-duration gamma-ray bursts (LGRBs), and quantify a possible metallicity dependence of the...
Heymans, Catherine, Bell, Eric F., Rix, Hans-Walter, Barden, Marco, Borch, Andrea, Caldwell, John A. R., ...
We present constraints on the evolution of the virial to stellar mass ratio of galaxies with high stellar masses in the redshift range 0.2
Die vorliegende Arbeit befasst sich mit der Ermittlung der Tragfähigkeit von Stäben aus Baustahl unter Berücksichtigung des nichtlinearen Tragverhaltens und von Stabilitätseinflüssen. Das...
The stellar masses of 25000 galaxies at 0.2 (2006)
Borch, Andrea, Meisenheimer, Klaus, Bell, Eric F., Rix, Hans-Walter, Wolf, Christian, Dye, Simon, ...
We present an analysis of stellar mass estimates for a sample of 25000 galaxies from the COMBO-17 survey over the interval 0.2 10^{11} solar masses at all z
Eight billion years of disk galaxy evolution: no galaxy is an island (2006)
Bell, Eric F., Barden, Marco, Zheng, Xianzhong, Papovich, Casey, Floc'h, Emeric Le, Rieke, George, ...
We present a brief discussion of the evolution of disk galaxy stellar masses, sizes, rotation velocities, and star formation rates over the last eight billion years. Recent observations have failed...
The merger rate of massive galaxies (2006)
Bell, Eric F., Phleps, Stefanie, Somerville, Rachel S., Wolf, Christian, Borch, Andrea, Meisenheimer, Klaus
We calculate the projected two point correlation function for samples of luminous and massive galaxies in the COMBO-17 photometric redshift survey, focusing particularly on the amplitude of the...
Barazza, Fabio D., Jogee, Shardha, Rix, Hans-Walter, Barden, Marco, Bell, Eric F., Caldwell, John A. R., ...
We present a study of the colors, structural properties, and star formation histories for a sample of ~1600 dwarfs over look-back times of ~3 Gyr (z=0.002-0.25). The sample consists of 401 distant...
The merger rate of massive galaxies (2006)
Bell, Eric F., Phleps, Stefanie, Somerville, Rachel S., Wolf, Christian, Borch, Andrea, Meisenheimer, Klaus
Heymans, Catherine, Bell, Eric F., Rix, Hans-Walter, Barden, Marco, Borch, Andrea, Caldwell, John A. R., ...
We present constraints on the evolution of the virial to stellar mass ratio of galaxies with high stellar masses in the redshift range 0.2 < z < 0.8, by comparing weak lensing measurements of virial...
The merger rate of massive galaxies (2006)
Bell, Eric F., Phleps, Stefanie, Somerville, Rachel S., Wolf, Christian, Borch, Andrea, Meisenheimer, Klaus
We calculate the projected two-point correlation function for samples of luminous and massive galaxies in the COMBO-17 photometric redshift survey, focusing particularly on the amplitude of the...
Dry mergers in GEMS: The dynamical evolution of massive early-type galaxies (2006)
Bell, Eric F., Naab, Thorsten, McIntosh, Daniel H., Somerville, Rachel S., Caldwell, John A. R., Barden, Marco, ...
We have used the 28'×28' Hubble Space Telescope image mosaic from the GEMS (Galaxy Evolution from Morphology and SEDs) survey in conjunction with the COMBO-17 photometric redshift survey to...
Barazza, Fabio D., Jogee, Shardha, Rix, Hans-Walter, Barden, Marco, Bell, Eric F., Caldwell, John A. R., ...
We present a study of the colors, structural properties, and star formation histories for a sample of ~1600 dwarfs over look-back times of ~3 Gyr (z=0.002-0.25). The sample consists of 401 distant...
Studying distant dwarf galaxies with GEMS and SDSS (2005)
Barazza, Fabio D., Jogee, Shardha, Rix, Hans-Walter, Barden, Marco, Bell, Eric F., Caldwell, John A. R., ...
We study the colors, structural properties, and star formation histories of a sample of ~1600 dwarfs over look-back times of ~3 Gyr (z=0.002-0.25). The sample consists of 401 distant dwarfs drawn...
Topological pressure via saddle points (2005)
Gelfert, Katrin, Wolf, Christian
Let $\Lambda$ be a compact locally maximal invariant set of a $C^2$-diffeomorphism $f:M\to M$ on a smooth Riemannian manifold $M$. In this paper we study the topological pressure $P_{\rm top}(\phi)$...
WFILAS: Wide Field Imager Lyman Alpha Search (2005)
Westra, Eduard, Jones, D. Heath, Lidman, Chris, Athreya, Ramana, Meisenheimer, Klaus, Wolf, Christian, ...
The Wide Field Imager Lyman-Alpha Search (WFILAS) is a search for Lya emitting galaxies at z~5.7. Deep images from the Wide Field Imager (WFI) on the ESO/MPI 2.2m telescope have been used to detect 7...
Bei der Projektierung und der Optimierung von Abfallverbrennungsanlagen mit Rostsystemen nimmt der Einsatz von computerunterstützten Methoden zu. Dabei erreicht die Simulation der...
Dry Mergers in GEMS: The Dynamical Evolution of Massive Early-Type Galaxies (2005)
Bell, Eric F., Naab, Thorsten, McIntosh, Daniel H., Somerville, Rachel S., Caldwell, John A. R., Barden, Marco, ...
We have used the 28'x 28' HST image mosaic from the GEMS (Galaxy Evolution from Morphology and SEDs) survey in conjunction with the COMBO-17 photometric redshift survey to constrain the incidence of...
Generalized physical and SRB measures for hyperbolic surface diffeomorphisms (2005)
Balakrishnan, R.D., Wolf, Christian
Paper presented to the 1st Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 22, 2005.
The size of the divergence points for rational maps (2005)
Kaufmann, Jacie L., Ingle, W., Wolf, Christian
Paper presented to the 1st Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Hughes Metropolitan Complex, Wichita State University, April 22, 2005.
Bei der Projektierung und der Optimierung von Abfallverbrennungsanlagen mit Rostsystemen nimmt der Einsatz von computerunterstützten Methoden zu. Dabei erreicht die Simulation der...
GEMS: The Size Evolution of Disk Galaxies (2005)
Barden, Marco, Rix, Hans-Walter, Somerville, Rachel S., Bell, Eric F., Haeussler, Boris, Peng, Chien Y., ...
We combine HST imaging from the GEMS survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z
Towards an understanding of the rapid decline of the cosmic star formation rate (2005)
Bell, Eric F., Papovich, Casey, Wolf, Christian, Floc'h, Emeric Le, Caldwell, John A. R., Barden, Marco, ...
We present a first analysis of deep 24 micron observations with the Spitzer Space Telescope of a sample of nearly 1500 galaxies in a thin redshift slice, 0.65
Détection de textes dans les images issues d'un flux vidéo pour l'indexation sémantique (2005)
Ce travail entre dans le cadre de l'indexation d'images et de vidéos. Les systèmes disponibles pour chercher dans les bases des documents audiovisuels travaillent sans connaissance, ils utilisent...
McIntosh, Daniel H., Bell, Eric F., Rix, Hans-Walter, Wolf, Christian, Heymans, Catherine, Peng, Chien Y., ...
We combine imaging from the Hubble Space Telescope Advanced Camera for Surveys, as part of the GEMS (Galaxy Evolution from Morphologies and SEDs) survey, with redshifts and rest-frame quantities from...
Galaxy-galaxy lensing studies from COMBO-17 (2005)
Kleinheinrich, Martina, Rix, Hans-Walter, Schneider, Peter, Erben, Thomas, Meisenheimer, Klaus, Wolf, Christian, ...
We study the dark matter halos of galaxies with galaxy-galaxy lensing using the COMBO-17 survey. This survey offers an unprecedented data set for studying lens galaxies at z=0.2-0.7 including...
Toward an understanding of the rapid decline of the cosmic star formation rate (2005)
Bell, Eric F., Papovich, Casey, Wolf, Christian, Le Floc'h, Emeric, Caldwell, John A. R., Barden, Marco, ...
We present a first analysis of deep 24 mum observations with the Spitzer Space Telescope of a sample of nearly 1500 galaxies in a thin redshift slice, 0.65
Cosmological weak lensing with the HST GEMS survey (2005)
Heymans, Catherine, Brown, Michael L., Barden, Marco, Caldwell, John A. R., Jahnke, Knud, Peng, Chien Y., ...
We present our cosmic shear analysis of GEMS, one of the largest wide-field surveys ever undertaken by the Hubble Space Telescope. Imaged with the Advanced Camera for Surveys (ACS), GEMS spans 795...
Weak Lensing Results from GEMS (2005)
Heymans, Catherine, Brown, Michael L., Barden, Marco, Caldwell, John A. R., Jahnke, Knud, Rix, Hans-Walter, ...
We present our cosmic shear analysis of the Galaxy Evolution from Morphology and SEDs (GEMS) survey. Imaged with the Advanced Camera for Surveys (ACS) on HST, GEMS provides high resolution imaging...
GEMS: The surface brightness and surface mass density evolution of disk galaxies (2005)
Barden, Marco, Rix, Hans-Walter, Somerville, Rachel S., Bell, Eric F., Häußler, Boris, Peng, Chien Y., ...
We combine HST imaging from the GEMS (Galaxy Evolution from Morphologies and SEDs) survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z
Duisburg, Essen, Universiẗat, Diss., 2005 (Nicht für den Austausch).
X.: ICDAR 2003 robust reading competitions: entries, results and future directions (2005)
Simon M. Lucas, Alex Panaretos, Luis Sosa, Kazuki Ashida, Hiroki Nagai, ...
This paper describes the robust reading competitions for ICDAR 2003. With the rapid growth in research over the last few years on recognizing text in natural scenes, there is an urgent need to...
The galaxy-dark matter bias in the Garching-Bonn Deep Survey (2004)
Simon, Patrick, Schneider, Peter, Erben, Thomas, Schirmer, Mischa, Wolf, Christian, Meisenheimer, Klaus
We measured the bias and correlation factor of galaxies with respect to the dark matter using the aperture statistics including the aperture mass from weak gravitational lensing. The analysis was...
McIntosh, Daniel H., Bell, Eric F., Rix, Hans-Walter, Wolf, Christian, Heymans, Catherine, Peng, Chien Y., ...
We combine HST/ACS imaging from the GEMS survey with redshifts and rest-frame quantities from COMBO-17 to study the evolution of morphologically early-type galaxies with red colors since z=1. We use...
Westra, Eduard, Jones, D. Heath, Lidman, Chris E., Athreya, Ramana M., Meisenheimer, Klaus, Wolf, Christian, ...
We report the spectroscopic confirmation of a compact \lya emitting galaxy at $z=5.721$. A FORS2 spectrum of the source shows a strong asymmetric line with a flux of 5$\times10^{-17}$ erg s$^{-1}$...
Cosmological weak lensing with the HST GEMS survey (2004)
Heymans, Catherine, Brown, Michael L., Barden, Marco, Caldwell, John A. R., Jahnke, Knud, Peng, Chien Y., ...
We present our cosmic shear analysis of GEMS, one of the largest wide-field surveys ever undertaken by the Hubble Space Telescope. Imaged with the Advanced Camera for Surveys (ACS), GEMS spans 795...
Galaxy-galaxy lensing studies from COMBO-17 (2004)
Kleinheinrich, Martina, Rix, Hans-Walter, Schneider, Peter, Erben, Thomas, Meisenheimer, Klaus, Wolf, Christian, ...
We study the dark matter halos of galaxies with galaxy-galaxy lensing using the COMBO-17 survey. This survey offers an unprecedented data set for studying lens galaxies at z=0.2-0.7 including...
Multi-Object Near-IR H-alpha Spectroscopy of z~1 star-forming galaxies in the HDF-N (2004)
Doherty, Michelle, Bunker, Andrew, Sharp, Robert, Dalton, Gavin, Parry, Ian, Lewis, Ian, ...
We present preliminary results from a programme to obtain multi-object near-infrared spectroscopy of galaxies at redshifts $0.7
MacDonald, Emily C., Allen, Paul, Dalton, Gavin, Moustakas, Leonidas A., Heymans, Catherine, Edmondson, Edward, ...
The Oxford Dartmouth Thirty Degree Survey (ODTS) is a deep, wide, multi-band imaging survey designed to cover a total of 30 square degrees in BVRi'Z, with a subset of U and K band data, in four...
GEMS: Galaxy Evolution from Morphologies and SEDs (2004)
Rix, Hans-Walter, Barden, Marco, Beckwith, Steven V. W., Bell, Eric F., Caldwell, John A. R., Haeussler, Boris, ...
GEMS, Galaxy Evolution from Morphologies and SEDs, is a large-area (800 arcmin2) two-color (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on HST. Centered on the Chandra Deep...
Schirmer, Mischa, Erben, Thomas, Schneider, Peter, Wolf, Christian, Meisenheimer, Klaus
We report the first confirmation of colour-selected galaxy cluster candidates by means of weak gravitational lensing. Significant lensing signals were identified in the course of the shear-selection...
Weak lensing with COMBO-17: Estimation and removal of intrinsic alignments (2004)
Heymans, Catherine, Brown, Michael, Heavens, Alan, Meisenheimer, Klaus, Taylor, Andy, Wolf, Christian
We estimate and remove the contamination of weak gravitational lensing measurements by the intrinsic alignment of close pairs of galaxies. We do this by investigating both the aperture mass B mode...
GEMS: Galaxy evolution from morphologies and SEDs (2004)
Rix, Hans-Walter, Barden, Marco, Beckwith, Steven V. W., Bell, Eric F., Borch, Andrea, Caldwell, John A. R., ...
GEMS (Galaxy Evolution from Morphologies and SEDs) is a large-area (800 arcmin2) two-color (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope....
Bell, Eric F., Wolf, Christian, Meisenheimer, Klaus, Rix, Hans-Walter, Borch, Andrea, Dye, Simon, ...
We present the rest-frame colors and luminosities of ~25,000 mRlt;~24 galaxies in the redshift range 0.2lt;zlt;=1.1 drawn from 0.78 deg2 of the COMBO-17 survey (Classifying Objects by...
GEMS imaging of red-sequence galaxies at z~0.7: Dusty or old? (2004)
Bell, Eric F., McIntosh, Daniel H., Barden, Marco, Wolf, Christian, Caldwell, John A. R., Rix, Hans-Walter, ...
We have used the 30'times;30' Hubble Space Telescope image mosaic from the Galaxy Evolution from Morphology and Spectral energy distributions (GEMS) project in conjunction with the COMBO-17 deep...
Jogee, Shardha, Barazza, Fabio D., Rix, Hans-Walter, Shlosman, Isaac, Barden, Marco, Wolf, Christian, ...
One-third of present-day spirals host optically visible strong bars that drive their dynamical evolution. However, the fundamental question of how bars evolve over cosmological times has yet to be...
Doherty, Michelle, Bunker, Andrew, Sharp, Robert, Dalton, Gavin, Parry, Ian, Lewis, Ian, ...
We present preliminary results from a programme to obtain multi-object near-infrared spectroscopy of galaxies at redshifts 0.7 < z < 1.5. We are using the instrument CIRPASS (the Cambridge Infra-Red...
Graham W. Taylor, Christian Wolf
A framework for parameterization in computer vision algorithms is evaluated by optimizing ten parameters of the text detection for semantic indexing algorithm preposed by Wolf et al. The Fuzzy ARTMAP...
MacDonald, Emily C., Allen, Paul, Dalton, Gavin, Moustakas, Leonidas A., Heymans, Catherine, Edmondson, Edward, ...
The Oxford-Dartmouth Thirty Degree Survey (ODTS) is a deep, wide, multiband imaging survey designed to cover a total of 30 deg2 in BVRi'Z, with a subset of U- and K-band data, in four separate fields...
MacDonald, Emily C., Allen, Paul, Dalton, Gavin, Moustakas, Leonidas A., Heymans, Catherine, Edmondson, Edward, ...
The Oxford-Dartmouth Thirty Degree Survey (ODTS) is a deep, wide, multiband imaging survey designed to cover a total of 30 deg2 in BVRi'Z, with a subset of U- and K-band data, in four separate fields...
Weak lensing with COMBO-17: estimation and removal of intrinsic alignments (2003)
Heymans, Catherine, Brown, Michael, Heavens, Alan, Meisenheimer, Klaus, Taylor, Andy, Wolf, Christian
We estimate and remove the contamination of weak gravitational lensing measurements by the intrinsic alignment of close pairs of galaxies. We do this by investigating both the aperture mass B mode...
GEMS Imaging of Red Sequence Galaxies at z~0.7: Dusty or Old? (2003)
Bell, Eric F., McIntosh, Daniel H., Barden, Marco, Wolf, Christian, Caldwell, John A. R., Rix, Hans-Walter, ...
We have used the 30'x30' Hubble Space Telescope image mosaic from the Galaxy Evolution from Morphology and SEDs (GEMS) project in conjunction with the COMBO-17 deep photometric redshift survey to...
Stable sets, hyperbolicity and dimension (2003)
Shafikov, Rasul, Wolf, Christian
In this note we derive an upper bound for the Hausdorff dimension of the stable set of a hyperbolic set $\Lambda$ of a $C^2$ diffeomorphisms on a $n$-dimensional manifold. As a consequence we obtain...
Galaxy-galaxy lensing results from COMBO-17 (2003)
Kleinheinrich, Martina, Schneider, Peter, Erben, Thomas, Schirmer, Mischa, Rix, Hans-Walter, Meisenheimer, Klaus, ...
We use galaxy-galaxy lensing to study the statistical properties of the dark matter halos of galaxies. Our data is taken from the COMBO-17 survey which has imaged 1 square degree in 17 optical...
Towards a new galaxy template library for multi-colour classification (2003)
Borch, Andrea, Meisenheimer, Klaus, Wolf, Christian, Gray, Meghan
The COMBO-17 survey cite{wolf} contains ~ 40000 galaxies down to R=24 mag on an area of one square degree, obtained with the wide field imager at the 2.2 m telescope at La Silla. A multi-colour...
Measuring dark matter halos using galaxy-galaxy lensing (2003)
Kleinheinrich, Martina, Schneider, Peter, Rix, Hans-Walter, Erben, Thomas, Wolf, Christian, Meisenheimer, Klaus, ...
Galaxy morphology from morphology and SEDs: GEMS (2003)
Beckwith, Steven V., Bell, Eric, Caldwell, John, Borch, Andrea, Macintosh, Dan, ...
Measures of maximal dimension for hyperbolic diffeomorphisms (2002)
Barreira, Luis, Wolf, Christian
ICM2002 Satellite Conference: New Directions in Dynamical Systems Abstracts (August 2002 Kyoto)
Measures of maximal dimension for hyperbolic diffeomorphisms (2002)
Barreira, Luis, Wolf, Christian
ICM2002 Satellite Conference: New Directions in Dynamical Systems Abstracts (August 2002 Kyoto)
Filtrations, hyperbolicity and dimension for polynomial automorphisms of C^n (2002)
Shafikov, Rasul, Wolf, Christian
In this paper we study the dynamics of regular polynomial automorphisms of C^n. These maps provide a natural generalization of complex Henon maps in C^2 to higher dimensions. For a given regular...
COMBO-17: Fifty thousand galaxies at a glance (2002)
Meisenheimer, Klaus, Wolf, Christian
Klaus Meisenheimer and Christian Wolf look forward to COMBO-17, a deep sky survey that should make it possible to bridge the gap between matter in the early universe and the pattern of galaxies that...
Mainz, Univ., Diss., 2002.
Erlangen, Nürnberg, Univ., Diss., 2003.
Binarization of Low Quality Text Using a Markov Random Field Model (2002)
Christian Wolf, David Doermann
Binarization techniques have been developed in the document analysis community for over 30 years and many algorithms have been used successfully. On the other hand, document analysis tasks are more...
Text Localization, Enhancement and Binarization in Multimedia Documents (2002)
Christian Wolf, Jean-michel Jolion, Françoise Chassaing
The systems currently available for content based image and video retrieval work without semantic knowledge, i.e. they use image processing methods to extract low level features of the data. The...
Measures of maximal dimension for hyperbolic diffeomorphisms, preprint (2002)
Abstract. We establish the existence of ergodic measures of maximal Hausdorff dimension for hyperbolic sets of surface diffeomorphisms. This is a dimension-theoretical version of the existence of...
Extraction and Recognition of Artificial Text in Multimedia Documents (2002)
Christian Wolf, Jean-michel Jolion, Bât J. Verne
The systems currently available for content based image and video retrieval work without semantic knowledge, i.e. they use image processing methods to extract low level features of the data. The...
Video indexing and retrieval at UMD (2002)
Christian Wolf, David Doermann, Mika Rautiainen
Our team from the University of Maryland and INSA de Lyon participated in the feature extraction evaluation with overlay text features and in the search evaluation with a query retrieval and browsing...
On measures of maximal and full dimension for polynomial automorphisms of $\C^2$ (2001)
For a hyperbolic polynomial automorphism of $\C^2$, we show the existence of a measure of maximal dimension, and identify the conditions under which a measure of full dimension exists.
Hausdorff and topological dimension for polynomial automorphisms of $\C^2$ (2001)
Let $g$ be a polynomial automorphism of $\C^2$. We study the Hausdorff dimension and topological dimension of the Julia set of $g$. We show that when $g$ is a hyperbolic mapping, then the Hausdorff...
Classification and Redshift Estimation in Multi-Color Surveys (2000)
Wolf, Christian, Meisenheimer, Klaus, Röser, Hermann-Josef
We present a photometric method for identifying stars, galaxies and quasars in multi-color surveys and estimating multi-color redshifts for the extragalactic objects. We use a library of >65000 color...
Efficiency of Medium-Band Surveys (2000)
Wolf, Christian, Meisenheimer, Klaus, Röser, Hermann-Josef
We simulate multi-color surveys, which use the same telescope time on different filter sets of broad-band and medium-band filters. We use a photometric classification method for identifying stars,...
Gewinnung von feinteiligem Brennstoff aus Abfällen (2000)
Wilczek, Michael, Wolf, Christian, Bertling, Jürgen, Kümmel, Rolf
Gewinnung von feinteiligem Brennstoff aus Abfällen (2000)
Wilczek, Michael, Wolf, Christian, Bertling, Jürgen, Kümmel, Rolf
Gewinnung von feinteiligem Brennstoff aus Abfällen (2000)
Wilczek, Michael, Wolf, Christian, Bertling, Jürgen, Kümmel, Rolf
Gewinnung von feinteiligem Brennstoff aus Abfällen (2000)
Wilczek, Michael, Wolf, Christian, Bertling, Jürgen, Kümmel, Rolf
Gewinnung von feinteiligem Brennstoff aus Abfällen (2000)
Wilczek, Michael, Wolf, Christian, Bertling, Jürgen, Kümmel, Rolf
Content based Image Retrieval using Interest Points and Texture Features (2000)
Christian Wolf, Jean-michel Jolion, Walter Kropatsch, Horst Bischof
Content based image retrieval is the task of searching images from a database, which are visually similar to a given example image. In this work we present methods for content based image retrieval...
Berlin, Techn. Univ., Diss., 1999.
Fraktale Juliamengen polynomialer Automorphismen des C2 / (1999)
München, Techn. Universiẗat, Diss., 1999.
Thesis (doctoral)--Universität zu Köln, 1998.
Measuring Small-Scale Water Surface Waves: Nonlinear Interpolation (1996)
Jason M. Daida, Robert R. Bertram, David R. Lyzenga, Christian Wolf, David T. Walker, Stephen A. Stanhope, ...
Figure 1.Surface Plot of Slope Data. Note that bubbles have a distinctive signature and represent a physical discontinuity either below or at the water’s surface. Note also that signal dropouts...
Thesis (doctoral)--Universität Hamburg, 1995.
Measuring topography of small-scale water surface waves,” to appear (1995)
Jason M. Daida, Donald Lund, Christian Wolf, Guy A. Meadows, Kirk Schroeder, John F. Vesecky, ...
Abstract—This paper focuses on recovering surface topography from shape-from-refraction data. Our solution features a hybrid genetic algorithm and model estimation approach. We briefly describe The...
Kriechverhalten von glasephasehaltigem Aluminiumoxid / (1995)
Zugl.: Hamburg, Techn. Universiẗat, Diss., 1994.
Flache Funktoren und homotopie-cokartesische Quadrate von klassifizierenden Räumen. (1987)
Heidelberg, Univ., Diss., 1987 (Nicht f.d. Austausch).
Thesis (doctoral)--Université de Reims, 1972.
Ferrokinetische Studien mit 59Fe bei Leberkranken. (1969)
Lübeck, Med. Ak., Diss. v. 17. Nov. 1969.
Dresden, Med. Ak., Diss. v. 31. Jan. 1959 (Nicht f. d. Aust.).
Single mesodermal cells guide outgrowth of ectodermal tubular structures in Drosophila
Wolf, Christian, Schuh, Reinhard
The Drosophila tracheal system, a tubular network, is formed from isolated ectodermal metameres by guided branch outgrowth and branch fusion. Branch outgrowth is triggered by the localized and...
Drosophila tracheal system formation involves FGF-dependent cell extensions contacting bridge-cells
Wolf, Christian, Gerlach, Nina, Schuh, Reinhard
Development of the ectodermally derived Drosophila tracheal system is based on branch outgrowth and fusion that interconnect metamerically arranged tracheal subunits into a highly stereotyped...
Single mesodermal cells guide outgrowth of ectodermal tubular structures in Drosophila
Wolf, Christian, Schuh, Reinhard
The Drosophila tracheal system, a tubular network, is formed from isolated ectodermal metameres by guided branch outgrowth and branch fusion. Branch outgrowth is triggered by the localized and...
Drosophila tracheal system formation involves FGF-dependent cell extensions contacting bridge-cells
Wolf, Christian, Gerlach, Nina, Schuh, Reinhard
Development of the ectodermally derived Drosophila tracheal system is based on branch outgrowth and fusion that interconnect metamerically arranged tracheal subunits into a highly stereotyped...
Reconstructing Incomplete Signals Using Nonlinear Interpolation and Genetic Algorithms
Robert R. Bertram, Jason M. Daida, John F. Vesecky, Guy A. Meadows, Christian Wolf
This paper describes a general, nonanalytical method for deriving Fourier series coefficients using a genetic algorithm. Nonanalytical methods are often needed in problems where lost portions of a...
Does ownership matter? The performance and efficiency of State Oil vs. Private Oil (1987-2006)
This paper investigates the existence of ownership effects in the global oil and gas industry, i.e. whether there are systematic performance and efficiency differentials between National Oil...