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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(More)
—This paper presents a real-time document image retrieval method for a large-scale database with Locally Likely Arrangement Hashing (LLAH). In general, when a database is scaled up, a large amount of memory is required and retrieval accuracy drops due to insufficient discrimination power of features. To solve these problems, we propose three improvements:(More)
We demonstrate how information about eye blink frequency and head motion patterns derived from Google Glass sensors can be used to distinguish different types of high level activities. While it is well known that eye blink frequency is correlated with user activity, our aim is to show that (1) eye blink frequency data from an unobtrusive, commercial(More)
Retrieval of electronic documents is a fundamental component for intelligent access to the contents of documents. Although the history of its research is long, it is still not a trivial task, in particular, when we retrieve long documents with short queries. For the retrieval of long documents , a method called passage-based document retrieval has proven to(More)
—Recognizing characters in a scene helps us obtain useful information. For the purpose, character recognition methods are required to recognize characters of various sizes, various rotation angles and complex layout on complex background. In this paper, we propose a character recognition method using local features having several desirable properties. The(More)
—This paper presents a novel interface running on smartphones which is capable of seamlessly linking physical and digital worlds through paper documents. This interface is based on a real-time document image retrieval method called Locally Likely Arrangement Hashing. By just only pointing a smartphone to a paper document, the user can obtain its(More)