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- Christian Perwass
- Geometry and Computing
- 2009

- Christian Perwass, Lennart Wietzke
- Human Vision and Electronic Imaging
- 2012

Placing a micro lens array in front of an image sensor transforms a normal camera into a single lens 3D camera, which also allows the user to change the focus and the point of view after a picture has been taken. While the concept of such plenoptic cameras is known since 1908, only recently the increased computing power of low-cost hardware and the advances… (More)

- Ole Johannsen, Christian Heinze, Bastian Goldlücke, Christian Perwass
- Time-of-Flight and Depth Imaging
- 2013

Plenoptic cameras provide a robust way to capture 3D information with a single shot. This is accomplished by encoding the direction of the incoming rays with a microlens array (MLA) in front of the camera sensor. In the focused plenoptic camera, a MLA acts like multiple small cameras that capture the virtual scene on the focus plane of a main lens from… (More)

- Gerald Sommer, Bodo Rosenhahn, Christian Perwass
- IWMM/GIAE
- 2004

We give a contribution to the representation problem of freeform curves and surfaces. Our proposal is an operational or kinematic approach based on the Lie group SE(3). While in Euclidean space the modelling of shape as an orbit of a point under the action of SE(3) is limited, we are embedding our problem into the conformal geometric algebra R4,1 of the… (More)

- Fredrik Vikstén, Robert Söderberg, Klas Nordberg, Christian Perwass
- Proceedings 2006 IEEE International Conference on…
- 2006

We have developed a system which integrates the information output from several pose estimation algorithms and from several views of the scene. It is tested in a real setup with a robotic manipulator. It is shown that integrating pose estimates from several algorithms increases the overall performance of the pose estimation accuracy as well as the… (More)

We present the design of a Clifford algebra co-processor and its implementation on a Field Programmable Gate Array (FPGA). To the best of our knowledge this is the first such design developed. The design is scalable in both the Clifford algebra dimension and the bit width of the numerical factors. Both aspects are only limited by the hardware resources.… (More)

Spatial reasoning is one of the central tasks in Computer Vision. It always has to deal with uncertain data. Projective geometry has become the working horse for modelling multiple view geometry, while modelling uncertainty with statistical tools has become a standard. Geometric reasoning in projective geometry with uncertain geometric elements has been… (More)

- Vladimir Banarer, Christian Perwass, Gerald Sommer
- ESANN
- 2003

In this paper a special higher order neuron, the hypersphere neuron, is introduced. By embedding Euclidean space in a conformal space, hyperspheres can be expressed as vectors. The scalar product of points and spheres in conformal space, gives a measure for how far a point lies inside or outside a hypersphere. It will be shown that a hypersphere neuron may… (More)

- Christian Perwass
- ICCVG
- 2004

- Christian Perwass, Rida T. Farouki, Lyle Noakes
- Computer Aided Geometric Design
- 2007

A novel formulation for spatial Pythagorean–hodograph (PH) curves, based on the geometric product of vectors from Clifford algebra, is proposed. Compared to the established quaternion representation, in which a hodograph is generated by a continuous sequence of scalings/rotations of a fixed unit vector n̂ , the new representation corresponds to a sequence… (More)