GONG Wei-guo, Zhang Xuan, LI Zheng-hao. Image registration based on extended LSH[J]. Editorial Office of Optics and Precision Engineering, 2011,19(6): 1375-1383
GONG Wei-guo, Zhang Xuan, LI Zheng-hao. Image registration based on extended LSH[J]. Editorial Office of Optics and Precision Engineering, 2011,19(6): 1375-1383 DOI: 10.3788/OPE.20111906.1375.
In order to realize quickly and accurately matching between the image features
an efficient high-dimensional feature vector retrieval algorithm
Extended Locality Sensitive Hashing(ELSH)
was proposed based on LSH(Locality Sensitive Hashing). Firstly
the Scale Invariant Feature Transform (SIFT) algorithm was used to get the special point of an image and its features. Then
according to the sub-vectors selected randomly from the SIFT features
a hash index structure was built to reduce the indexing dimension and the searching scope. Thus
it can significantly reduce the time cost of indexing. Finally
the Random Sample Consensus (RANSAC) algorithm was used to select the right feature point pairs. Experimental results indicate that compared with the Best-Bin-First(BBF) and the LSH algorithm
ELSH algorithm not only ensures the accuracy of matching points
but also reduces the matching time. The time cost of ELSH only takes 50.1% of that of the BBF
and 62.1% of that of the LSH. In conclusion
the proposed algorithm can quickly and precisely achieve the registration between images.
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references
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