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CCIW
2009
Springer
15 years 4 months ago
Structure Tensor of Colour Quaternion Image Representations for Invariant Feature Extraction
Colour image representation using real quaternions has shown to be very useful for linear and morphological colour filtering. This paper deals with the extension of first derivat...
Jesús Angulo
ICCTA
2007
IEEE
15 years 3 months ago
A Comparative Study on 2D Curvature Estimators
Curvature is a frequently used property in two-dimensional (2D) shape analysis, directly or for derived features such as corners or convex and concave arcs. This paper presents cur...
Simon Hermann, Reinhard Klette
DAGM
2001
Springer
15 years 2 months ago
Points, Lines, and Planes and Their Optimal Estimation
Abstract. We present a method for estimating unknown geometric entities based on identical, incident, parallel or orthogonal observed entities. These entities can be points and lin...
Stephan Heuel
CCCG
2003
14 years 11 months ago
Shortest Paths in Two Intersecting Pencils of Lines
Suppose one has a line arrangement and one wants to find a shortest path from one point lying on a line of the arrangement to another such point. We look at a special case: the a...
David Hart
CORR
2002
Springer
91views Education» more  CORR 2002»
14 years 9 months ago
Quantum Random Walks Hit Exponentially Faster
We show that the hitting time of the discrete time quantum random walk on the n-bit hypercube from one corner to its opposite is polynomial in n. This gives the first exponential ...
Julia Kempe