AnimatedPresentationsGeneration_24June2004.ppt

7/27/2019 AnimatedPresentationsGeneration_24June2004.ppt

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Automatic Generation ofAnimated Presentations

Gur Wizenfeld

Advanced Software Tools

SeminarJune 2004


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Gur Wizenfeld - Advanced Software Tools Seminar 2004

Agenda

Introduction to animated presentationsgeneration

Stating the problemApplications

Solution Considerations

Approaches Hierarchical task decomposition (Karp &

Feiner)


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Methodology

Purpose Introduce the problem and its complexity

Introduce and evaluate various solution approaches

Main Resources Steven Drucker, Intelligent Camera Control for Graphical Environments [3].

Peter Karp and Steven Feiner, Issues in the Automated Generation of AnimatedPresentations [5].

Peter Karp and Steven Feiner, Automated Presentation Planning Using TaskDecomposition with Heuristic Reasoning [6].

D.A. Friedman and Y. A. Feldman, Knowledge-Based Cinematography and its

Applications, Proc. 16th European Conf. Artificial Intelligence (ECAI 2004), August2004 [4].

David Christianson et al., Declarative Camera Control for Automatic Cinematography[2].

Maneesh Agrawala, Designing Effective Step-By-Step Assembly Instructions,SIGGRAPH 2003 [1].


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Introduction to Animated

Presentations Generation


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Stating the Problem

Given a script, describing a dynamic

virtual 3D environment, generate an

animated presentation of the scriptsrelevant information.


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Example: A Soccer Game

Versatile content

Versatile style

Slow motion

Multiple camera angles

Textual annotations

Dynamic

Parallel occurrences

Real-time

(unpredictable)


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Stating the Problem (Detailed)

Environment

Spatial organization of 3D objects

3D representation of objects (e.g.,polygonal mesh)

Dynamic

Objects may be capable of modifying theenvironment.


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Script

Written in a formal language

Describes all modifications to theenvironment over time

Possibly annotated

Possibly unpredictable (e.g., in interactiveapplications)


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Presentation A description of every frame of the animated

presentation A combination of viewports

The contents of each viewport is generated by renderingthe environment from a virtual cameras point of view.

Specifying camera parameters for each viewportin each frame is sufficient.

Possible extensions: Audio

Textual annotations

Lighting14:46


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Applications: 3D Visualization

Virtual environment walkthroughs

Architecture

Virtual malls

Scientific Visualization

Large multidimensional datasets

exploration Medical imaging

Weather simulation


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Applications: Entertainment

Computer animated movies

Games

Highly interactive Unpredictable script

Rich 3D environment

Fast Paced

MUDs Parallel & distributed

Raises the need for automated summaries


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Applications: Design & Planning

CAD

Manufacturing process

planning Animation generation


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Solution Considerations


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Solution Considerations:

User Task Exploration

Orientation

Navigation

Search/Wander

Planning

Control & Teleoperation


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Degree of Interaction Frequency of interaction

Continuous vs. autonomous

Style of interaction

Direct control of camera vs. symbolic

specification


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Supporting Cognitive Capabilities

Presentation viewing and understanding is based oncomplex underlying perceptive and cognitivemechanisms.

Motion from still images 3D spatial relations from 2D projections

Recognition

Attention

Memory

(Story understanding)

A comprehensive cognitive model would help, but isdifficult to construct.


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Collective Cinematic

Experience Collective human

experience of cinematicexpression has formed acinematic language. Grammar

Rules

Idioms An Idiomis a stereotypical way

to capture some specific actionas a series of shots.

Evolving genres

Trevor Goringwww.famousframes.com
http://www.famousframes.com/http://www.famousframes.com/http://www.famousframes.com/cgi-bin/ImageFolio31/imageFolio.cgi?direct=Artists/0320~Trevor_Goring/The_Italian_Job&img=


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Continuity Avoid jump cuts (i.e., cuts between which

the camera rotates about the object by less

than 30.)

Do not interrupt a steady, flowing action with

a cut (or use time overlapping shots.)

Maintain the relative screen position of an

object across cuts.

Avoid line crossing in a cut (or use an

intermediate shot.)


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Example: Avoid Line Crossing

Andrew Burward-Hoy

www.famousframes.com
http://www.famousframes.com/http://www.famousframes.com/


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Presentation Hierarchy

Frame ... Frame

Shot >TransitionTransition

Documents

AnimatedPresentationsGeneration_24June2004.ppt