| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a system using invisible junctions for image-based document patch recognition, and to overcome the deficiencies of the prior art. <P>SOLUTION: The present invention uses invisible junctions which are a set of local features unique to every page of the electronic document to match the captured image to a part of an electronic document. The present invention includes: an image capture device, a feature extraction and recognition system and database. When an electronic document is printed, the feature extraction and recognition system captures an image of the document page. The features in the captured image are then extracted, indexed and stored in the database. Given a query image, the features in the query image are extracted and compared against those stored in the database to identify the query image. The present invention advantageously uses geometric estimation to reduce the query results to a single one or a few candidate matches. In one embodiment, the two separate geometric estimations are used to rank and verify matching candidates. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
