Use of Affine Invariants and Similarity Invariants in Fast Camera-based Document Image Retrieval

Language	Japanese
Type	Proceedings of Japanese Conferences
Authors	Tomohiro Nakai, Koichi Kise, 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	Not reviewed
Date	February 2006
Research fields	Document Image Analysis, Document Image Retrieval
Key	`Nakai2006_IEICEPRMU_Use` (id=408)

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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{authors}{authors_and}{authors_ja}{authors_ja_tight}{authors_en}{authors_en_and}{authors_tight}{first_author}{title}{title_ja}{title_en}{journal}{journal_ja}{journal_en}{book_title}{volume}{number}{series}{presen_id}{pages}{pp}{num_pages}{year}{month}{month_en}{month_short}{ym}{date}{date_ja}{date_en}{publisher}{address}{location}{review}{review_ja}{review_en}{reviewed_mark}{presen_type}{type}{type_label}{doi}{url}{key}{awards}

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@inproceedings{Nakai2006_IEICEPRMU_Use, author = {Nakai, Tomohiro and Kise, Koichi and Iwamura, Masakazu}, title = {Use of Affine Invariants and Similarity Invariants in Fast Camera-based Document Image Retrieval}, booktitle = {Technical Report of IEICE}, year = 2006, month = feb, volume = {105}, number = {PRMU-614}, pages = {25--30}, note = {PRMU2005-188} }

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