Yoon-Chul Choy

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ÐGeometric structure analysis is a prerequisite to create electronic documents from logical components extracted from document images. This paper presents a knowledge-based method for sophisticated geometric structure analysis of technical journal pages. The proposed knowledge base encodes geometric characteristics that are not only common in technical(More)
Sketch-n-Stretch lets novices quickly and easily create 2D animations. The system has a seamless two-layer drawing interface that supports cutouts using a whiteboard metaphor. Cutout animations serve as building blocks to help users construct sophisticated animations. While manipulating cutout animations, users can draw and write text to create effects-such(More)
To support collaboration in 3D virtual space, a technology to express the intention directly between collaborators is required. For such method to express the intention the sketch is most effective and this is because the sketch is conventionally able to express the intention quickly, easily and intuitively. Also, the annotation entered through such sketch(More)
The sketch technique, which can quickly and easily make expressions, is very useful in effectively adapting 3D virtual space technology to the collaboration. In order for the sketch technique to apply to the 3D virtual space, we need to solve the problem of inputting 2D sketch to a 3D virtual space and the phase difference that can occur during input. This(More)
This paper presents a syntactic method for sophisticated logical structure analysis that transforms document images with multiple pages and hierarchical structure into an electronic document based on SGML/XML. To produce a logical structure more accurately and quickly than previous works of which the basic units are text lines, the proposed parsing method(More)
We introduce a multiple-pass sketch-based user interface, designed for novice users, which avoids spatial ambiguities and hence allows considerable freedom in creating 3D animations. The user first draws the path along which a character or object is to move. A vertical motion window is then erected along this path, on which the user specifies the(More)
There are many studies on retrieval methods for structured documents but most of the studies are for those whose structure information is expressed by elements. But when elements are used to describe a document structure, the structure becomes static and difficult to expand. So describing a document structure using attributes is used in many standards. But(More)