Real time spline curves from interactively sketched data

BanksMichael,; CohenElaine,

doi:10.1145/91394.91425

Cited by 11 publications

(9 citation statements)

References 8 publications

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“…Previous methods on feature point detection either rely on preset constants and thresholds (Sezgin et al November 2001;Calhoun et al 2002), or don't support drawing arbitrary shapes (Schneider 1988;Banks & Cohen 1990).…”

Section: Related and Future Workmentioning

confidence: 99%

Scale-space based feature point detection for digital ink

Sezgin¹,

Davis²

2007

ACM SIGGRAPH 2007 Courses

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Feature point detection is generally the first step in model-based approaches to sketch recognition. Feature point detection in free-hand strokes is a hard problem because the input has noise from digitization, from natural hand tremor, and from lack of perfect motor control during drawing. Existing feature point detection methods for free-hand strokes require hand-tuned thresholds for filtering out the false positives. In this paper, we present a threshold-free feature point detection method using ideas from the scale-space theory.

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Section: Related and Future Workmentioning

confidence: 99%

Scale-space based feature point detection for digital ink

Sezgin¹,

Davis²

2007

ACM SIGGRAPH 2007 Courses

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“…We deal with the false positives using the hybrid fit generation scheme described below. 3 While average based filtering performs better than simply comparing the curvature data against a hard coded threshold, it is still clearly not free of empirical constants. As we explain when considering future work, scale space provides a better approach for dealing with noisy data without having to make a priori assumptions about the scale of relevant features.…”

Section: Vertex Detectionmentioning

confidence: 99%

“…The work in [3] describes a system for generating realtime spline curves from interactively sketched data. They focus on using knot removal techniques to approximate strokes known to be composed only of curves, and do not handle single strokes that contain both lines and curves.…”

Section: Related Workmentioning

confidence: 99%

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Sketch based interfaces

Sezgin

Stahovich²,

Davis

2007

ACM SIGGRAPH 2007 Courses

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Freehand sketching is a natural and crucial part of everyday 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 processing 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.

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“…In that system, path geometry and path timing specifications were decoupled, loosing thus the advantages of performance approaches. Banks and Cohen [6] proposed for their drafting tool an incremental version of the Lyche and Mørken algorithm [22] that does not have the aforementioned drawbacks and could be used in a performance animation context. Their method shares with ours the idea of processing successive portions of the input curve which are then spliced together, but is unable to ensure constant latency times and memory needs [4].…”

Section: Data Reductionmentioning

confidence: 99%

An integrated environment to visually construct 3D animations

Gobbetti

Balaguer

1995

Proceedings of the 22nd Annual Conference on Computer Graphics and Interactive Techniques - SIGGRAPH '95

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In this paper, we present an expressive 3D animation environment that enables users to rapidly and visually prototype animated worlds with a fully 3D user-interface. A 3D device allows the specification of complex 3D motion, while virtual tools are visible mediators that live in the same 3D space as application objects and supply the interaction metaphors to control them. In our environment, there is no intrinsic difference between userinterface and application objects. Multi-way constraints provide the necessary tight coupling among components that makes it possible to seamlessly compose animated and interactive behaviors. By recording the effects of manipulations, all the expressive power of the 3D user interface is exploited to define animations. Effective editing of recorded manipulations is made possible by compacting all continuous parameter evolutions with an incremental data-reduction algorithm, designed to preserve both geometry and timing. The automatic generation of editable representations of interactive performances overcomes one of the major limitations of current performance animation systems. Novel interactive solutions to animation problems are made possible by the tight integration of all system components. In particular, animations can be synchronized by using constrained manipulation during playback. The accompanying video-tape illustrates our approach with interactive sequences showing the visual construction of 3D animated worlds. All the demonstrations in the video were recorded live and were not edited.

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Real time spline curves from interactively sketched data

Cited by 11 publications

References 8 publications

Scale-space based feature point detection for digital ink

Scale-space based feature point detection for digital ink

Sketch based interfaces

An integrated environment to visually construct 3D animations

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