Sezgin2001Sketchbased - Sketch Based Interfaces: Early...

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Sketch Based Interfaces: Early Processing for Sketch Understanding Tevfik Metin Sezgin MIT AI Laboratory Massachusetts Institute of Technology Cambridge MA 02139, USA mtsezgin@ai.mit.edu Thomas Stahovich CMU Deptarment of Mechanical Engineering Pittsburgh, PA 15213 stahov@andrew.cmu.edu Randall Davis MIT AI Laboratory Massachusetts Institute of Technology Cambridge MA 02139, USA davis@ai.mit.edu ABSTRACT Freehand sketching is a natural and crucial part of every- day human interaction, yet is almost totally unsupported by current user interfaces. We are working to combine the flexibility and ease of use of paper and pencil with the pro- cessing power of a computer, to produce a user interface for design that feels as natural as paper, yet is considerably smarter. One of the most basic steps in accomplishing this is converting the original digitized pen strokes in a sketch into the intended geometric objects. In this paper we describe an implemented system that combines multiple sources of knowledge to provide robust early processing for freehand sketching. Categories and Subject Descriptors D.2.2 [ Design Tools and Techniques ]: User interfaces; H.5.2 [ User Interfaces ]: Input Devices and strategies; J.6 [ Computer Aided Engineering ]: CAD General Terms Design, Human Factors Keywords freehand sketching, natural interaction, multiple sources of knowledge 1. INTRODUCTION Freehand sketching is a familiar, efficient, and natural way of expressing certain kinds of ideas, particularly in the early phases of design. Yet this archetypal behavior is largely un- supported by user interfaces in general and by design soft- ware in particular, which has for the most part aimed at providing services in the later phases of design. As a re- sult designers either forgo tool use at the early stage or end Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. PUI 2001 Orlando FL, USA Copyright 2001 ACM X-XXXXX-XX-X/XX/XX . .. $ 5.00. up having to sacri±ce the utility of freehand sketching for the capabilities provided by the tools. When they move to a computer for detailed design, designers usually leave the sketch behind and the e²ort put into de±ning the rough ge- ometry on paper is largely lost. We are working to provide a system where users can sketch naturally and have the sketches understood. By “under- stood” we mean that sketches can be used to convey to the system the same sorts of information about structure and behavior as they communicate to a human engineer.
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This note was uploaded on 06/12/2011 for the course CAP 6105 taught by Professor Lavoila during the Spring '09 term at University of Central Florida.

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Sezgin2001Sketchbased - Sketch Based Interfaces: Early...

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