Abstract
The problem of image matching under rotation is to find for two given digital images A and B a rotation that converts image A as close as possible to B. The research in combinatorial pattern matching led to a series of improving algorithms which commonly attack this problem by searching the complete set of all rotations of A. We present the first optimal algorithm of this kind, i.e, one that solves image matching in time for images of size n ×n. Subsequently, for image matching under compositions of rotation and scaling we show a new lower bound Ω(n 6 / logn) on the cardinality of , the set of rotated and scaled transformations of A. This bound almost matches the upper bound O(n 6).
Partially supported by DFG research grant RE 672/5-1.
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Hundt, C., Liśkiewicz, M. (2009). New Complexity Bounds for Image Matching under Rotation and Scaling. In: Kucherov, G., Ukkonen, E. (eds) Combinatorial Pattern Matching. CPM 2009. Lecture Notes in Computer Science, vol 5577. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02441-2_12
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DOI: https://doi.org/10.1007/978-3-642-02441-2_12
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