On 05.04.2007 at 12:20 in S5, there is the following noon lecture:
How many points can be reconstructed from k projections?
KAM, MFF UK
How many points can be reconstructed from k projections? Ales Privetivy (joint work with Jiri Matousek and Petr Skovron)
Let A be an n-point set in the plane. A discrete X-ray of A in direction u gives the number of points of A on each line parallel to u. We define F(k) as the maximum number n such that there exist k directions u_1,...,u_k such that every set of at most n points in the plane can be uniquely reconstructed from its discrete X-rays in these directions. We establish a mildly exponential lower bound F(k)>2^((k/2)^(1/3)).
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