Use of Affine Invariants in Locally Likely Arrangement Hashing for Camera-Based Document Image Retrieval
| 言語 | 英語 |
|---|---|
| 種類 | 国際会議等の予稿 |
| 著者 | Tomohiro Nakai，Koichi Kise，Masakazu Iwamura |
| 論文名 | Use of Affine Invariants in Locally Likely Arrangement Hashing for Camera-Based Document Image Retrieval |
| 論文誌名 | Lecture Notes in Computer Science (7th International Workshop DAS2006) |
| Vol. | 3872 |
| ページ | pp.541-552 |
| 発表場所 | Nelson, New Zealand |
| 査読の有無 | 有 |
| 年月 | 2006年2月 |
| 分野 | 文書画像解析, 文書画像検索 |
| DOI | 10.1007/11669487_48 |
| キー | Nakai2006_DAS (id=383) |
要約
Camera-based document image retrieval is a task of searching document images from the database based on query images captured using digital cameras. For this task, it is required to solve the problem of “perspective distortion”of images, as well as to establish a way of matching document images efficiently. To solve these problems we have proposed a method called Locally Likely Arrangement Hashing (LLAH) which is characterized by both the use of a perspective invariant to cope with the distortion and the efficiency: LLAH only requires O(N) time where N is the number of feature points that describe the query image. In this paper, we introduce into LLAH an affine invariant instead of the perspective invariant so as to improve its adjustability. Experimental results show that the use of the affine invariant enables us to improve either the accuracy from 96.2% to 97.8%, or the retrieval time from 112 msec./query to 75 msec./query by selecting parameters of processing.
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