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Detail of Publication

Text Language Japanese
Authors Tomohiro Nakai, Koichi Kise, and Masakazu Iwamura
Title Use of Affine Invariants and Similarity Invariants in Fast Camera-based Document Image Retrieval
Journal Technical Report of IEICE
Vol. 105
No. PRMU-614
Presentation number PRMU2005-188
Pages pp.25-30
Reviewed or not Not reviewed
Month & Year February 2006
Abstract We have already proposed a method of camera-based document image retrieval which utilizes perspective invariants called cross-ratios. However, the cross-ratios have defects that they are unstable against changes of positions of feature points. In this paper, we evaluate the use of affine invariants and similarity invariants which are considered to be more stable. Experimental results have shown that higher accuracy is obtained with affine invarinats even under perspective distortion. It is also shown that similarity invariants are not suitable for retrieval of largely distorted images since they are not robust to perspective distortion.
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