Froese, Richard, Hasler, David, Spitzer, Wolfgang
We consider random Schr\"odinger operators on tree graphs and prove absolutely continuous spectrum at small disorder for two models. The first model is the usual binary tree with certain strongly...
Griesemer, Marcel, Hasler, David
For a large class of quantum mechanical models of matter and radiation we develop an analytic perturbation theory for non-degenerate ground states. This theory is applicable, for example, to models...
Using Colour to Model Outliers (2007)
David Hasler, Sabine Süsstrunk, Gretagmacbeth Steinfurt
Computer vision applications are able to model and reconstruct three dimensional scenes from several pictures. In this work, we are interested in the group of algorithm that register each image with...
David Hasler, Sabine Sfisstrunk
We address the question of mapping colour in a panoramic image built by stitching several uncalibrated digital photographs. To map the colours, we need to identify the Opto-Electronic Conversion...
On the Lifetime of Quasi-Stationary States in Non-Relativistic QED (2007)
Hasler, David, Herbst, Ira, Huber, Matthias
We consider resonances in the Pauli-Fierz model of non-relativistic QED. We use and slightly modify the analysis developed by Bach, Froehlich, and Sigal to obtain an upper and lower bound on the...
Absence of Ground States for a Class of Translation Invariant Models of Non-relativistic QED (2007)
We consider a class of translation invariant models of non-relativistic QED with net charge. Under certain natural assumptions we prove that ground states do not exist in the Fock space.
Froese, Richard, Hasler, David, Spitzer, Wolfgang
We give a new proof of a version of Klein's theorem on the existence of absolutely continuous spectrum for the Anderson model on the Bethe Lattice at weak disorder.
Perspectives on panoramic photography (2005)
Digital imaging brings a new set of possibilities to photography. For example, little pictures can be assembled to form a large panorama, and digital cameras are trying to mimic the human visual...
Richard Froese, David Hasler, Wolfgang Spitzer
Absolutely continuous spectrum for the Anderson model on a tree:
The Independence on Boundary Conditions for the Thermodynamic Limit of Charged Systems (2004)
Hasler, David, Solovej, Jan Philip
We study systems containing electrons and nuclei. Based on the fact that the thermodynamic limit exists for systems with Dirichlet boundary conditions, we prove that the same limit is obtained if one...
Mapping colour in image stitching applications (2004)
Hasler, David, Süsstrunk, Sabine
Digitally, panoramic pictures can be assembled from several individual, overlapping photographs. While the geometric alignment of these photographs has retained a lot of attention from the computer...
Richard Froese, David Hasler, Wolfgang Spitzer
We prove the existence of absolutely continuous spectrum for a class of discrete Schrödinger operators on tree like graphs. We consider potentials whose radial behaviour is subject only to an ℓ...
Mapping colour in image stitching applications (2004)
David Hasler, Sabine Sfisstrunk
Digitally, panoramic pictures can be assembled fi'om several individual, overlapping photographs. While the geometric alignment of these photographs has retained a lot of attention from the...
Mapping colour in image stitching applications (2004)
David Hasler, Sabine Süsstrunk
Digitally, panoramic pictures can be assembled from several individual, overlapping photographs. While the geometric alignment of these photographs has retained a lot of attention from the computer...
Outlier modeling in image matching (2003)
Hasler, David, Sbaiz, Luciano, Süsstrunk, Sabine, Vetterli, Martin
We address the question of how to characterize the outliers that may appear when matching two views of the same scene. The match is performed by comparing the difference of the two views at a pixel...
Using colour to model outliers (2003)
Hasler, David, Süsstrunk, Sabine
Computer vision applications are able to model and reconstruct three dimensional scenes from several pictures. In this work, we are interested in the group of algorithm that register each image with...
Outlier modeling in image matching (2003)
David Hasler, Luciano Sbaiz, Sabine Siisstrunk, Martin Vetterli
We address the question of how to characterise the outliers that may appear when matching two views of the same scene. The match is performed by comparing the difference of the two views at a pixel...
Outlier Modeling in Image Matching (2003)
David Hasler, Luciano Sbaiz, Sabine Susstrunk, Martin Vetterli
We address the question of how to characterize the outliers that may appear when matching two views of the same scene.
We consider reduced Super Yang-Mills Theory in $d+1$ dimensions, where $d=2,3,5,9$. We present commutators to prove that for $d=3,5$ and 9 a possible ground state must be a $Spin(d)$ singlet. We also...
Perspectives on panoramic photography / (2002)
Thèse no 2419 sc. techn. EPF Lausanne, 2001.
Perspectives on panoramic photography (2001)
Digital imaging brings a new set of possibilities to photography. For example, little pictures can be assembled to form a large panorama, and digital cameras are trying to mimic the human visual...
Colour handling in panoramic photography (2001)
David Hasler, Sabine Süsstrunk
Nowadays, the ability to create panoramic photographs is included with most of the commercial digital cameras. The principle is to shoot several pictures and stitch them together to build a panorama....