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- Astrid Lundmark, Niclas Wadströmer, Haibo Li
- IEEE Trans. Image Processing
- 2001

Recursive image subsampling which yields support areas approaching fractals is described and analyzed using iterated function systems. The subsampling scheme is suitable in, e.g., hierarchical image processing and image coding schemes. For hexagonally sampled images a hierarchical subsampling structure is given which yields hexagon-like regions with fractal… (More)

- Michael Felsberg, Fredrik Larsson, Johan Wiklund, Niclas Wadströmer, Jörgen Ahlberg
- IEEE Transactions on Pattern Analysis and Machine…
- 2013

We propose a novel method for iterative learning of point correspondences between image sequences. Points moving on surfaces in 3D space are projected into two images. Given a point in either view, the considered problem is to determine the corresponding location in the other view. The geometry and distortions of the projections are unknown, as is the shape… (More)

- Niclas Wadströmer
- IEEE Trans. Image Processing
- 2003

We present an automatization of Barnsley's manual algorithm for the solution of the inverse problem of iterated function systems (IFSs). The problem is to retrieve the number of mappings and the parameters of an IFS from a digital binary image approximating the attractor induced by the IFS. M.F. Barnsley et al. described a way to solve manually the inverse… (More)

There are several efficient algorithms by which one can generate approximations of binary attractors induced from contractive set mappings which are composed of aff-ine mappings. There are also complex attractors resembling natural-looking images where the attractors are induced from only a few affine mappings which can be represented with a few bits. Thus… (More)

- Jan-Ke Larsson, Niclas Wadströmer, Ola Hermanson, Urban Lendahl, Robert Forchheimer
- Journal of theoretical biology
- 2011

A cell lineage is the ancestral relationship between a group of cells that originate from a single founder cell. For example, in the embryo of the nematode Caenorhabditis elegans an invariant cell lineage has been traced, and with this information at hand it is possible to theoretically model the emergence of different cell types in the lineage, starting… (More)

Hexagonal regions are optimal for subdividing the plane in the sense that the regions are as close as possible to the disk shape while still providing a tessellation of the plane. It is however not possible to do recursive subdivisions, i.e. to divide a hexagon into smaller hexagons. In this paper, hexagon-like fractal regions will be presented. It is… (More)

How can a complex organism grow from a single cell by repeated cell division, without central control or syn-chronization? We will discuss this question and describe a simulation of the growth of a " complex " organism from a single cell to the full grown organism. We have designed a simulated cell and its environment and we have generated " DNA-code " for… (More)

Critical infrastructures are attractive targets for attacks by intruders with different hostile aims. Modern information and sensor technology provides abilities to detect such attacks. The objective of this work is to outline a system design for surveillance systems aimed at protection of critical infrastructures, with the focus on early threat detection… (More)

- Magnus Jändel, Pontus Svenson, Niclas Wadströmer
- 2012 15th International Conference on Information…
- 2012

Statistical Relational Learning (SRL) methods for anomaly detection are introduced via a security-related application. Operational requirements for online learning stability are outlined and compared to mathematical definitions as applied to the learning process of a representative SRL method - Bayesian Logic Programs (BLP). Since a formal proof of online… (More)

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