Title :
Camera-based document image retrieval as voting for partial signatures of projective invariants
Author :
Nakai, Tomohiro ; Kise, Koichi ; Iwamura, Masakazu
Author_Institution :
Graduate Sch. of Eng., Osaka Prefecture Univ., Japan
fDate :
29 Aug.-1 Sept. 2005
Abstract :
We propose a method of document image retrieval using digital cameras. The proposed method takes as input a part or the whole of a document acquired as a query by a digital camera, and retrieves a document image that includes the query. For this purpose, it is required to solve the problem of "perspective distortion" of images, as well as to establish a way of matching parts of document images flexibly. These are achieved based on the following characteristics of the proposed method: (1) indexing of document images using the projective invariants called the "cross-ratios", (2) retrieval as voting for partial signatures of document images defined by the cross-ratios. From experimental results using digital cameras with high and low resolutions, we demonstrate the effectiveness of the proposed method.
Keywords :
cameras; cryptography; digital signatures; document image processing; image retrieval; indexing; visual databases; digital camera; document image indexing; document image retrieval; image database; partial signature; perspective distortion; projective invariant; Computational efficiency; Digital cameras; Image analysis; Image databases; Image resolution; Image retrieval; Indexing; Mobile handsets; Text analysis; Voting;
Conference_Titel :
Document Analysis and Recognition, 2005. Proceedings. Eighth International Conference on
Print_ISBN :
0-7695-2420-6
DOI :
10.1109/ICDAR.2005.64