Partial Motion Query and Assembly for Character animation

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Partial Motion Query and Assembly for Character
animation

• Speaker Gwo-Hao Juang
• Advisor I-Chen Lin

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Outline

• Introduction
• Related work
• Partial figure retrieval
• Partial figure Assembly
• Results
• Conclusions Future work

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Introduction

• Motion capture has been widely used in several
  industries
• It is an important topic to reuse the motion
  capture data

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Introduction

• Goal
• Creating an intuitive editing tool for assembling
  different partial figures of human motion
• Enriching the motion capture database

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Introduction

• Goal
• Creating an intuitive editing tool for assembling
  different partial figures of human motion
• Enriching the motion capture database

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Related work

• Efficient Content-Based Retrieval of Motion
  Capture Data SIGGRAPG Muller 2005
• they used a class of boolean features indicating
  geometric relations of a pose to identify the
  logical correspondence of similar motion

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Related Work

• Splicing upper-body actions with locomotion
  EUROGRAPHICS Heck 06

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Related work

• Combined Partial Motion Clips WSCG Nadia 03

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Partial figure retrieval

• Define geometric features
• Adaptive segmentation

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Partial figure retrieval

• Indexing
• Each feature vector gives a index number
• Retrieval
• Finding the same feature sequence
• Let be the motion segment
  sequence of query motion Q with for 1
  lt l lt L
• be the sequence of
  database with
• for 1 lt m lt M

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Partial figure retrieval

• The search hit means
• For each Vl we have the inverted list
• The set of all hits in the database
• with

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Partial figure retrieval

• The search hit means
• For each Vl we have the inverted list
• The set of all hits in the database
• with

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Assembling different partial motion

• Scale the retrieval motion segment
• Assembling different part of the motion figure
• Continue and smooth
• Bezier interpolation with whole motion clips

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Assembling different partial motion
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Assembling different partial motion

• Tuning
• In case of punch motion
• In our experiment, the angle between body and
  arms are critical point of the punch motion
• Using this angle as our tuning adjudgment
• Finding the middle angle of the query motion Qmid
• If the number of the angles in the anticipating
  motion gt Qmid below the threshold (0.3)
• tuning

?
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Assembling different partial motion

• In order to retain the style of the retrieval
  partial figure motion
• Using statistic properties to improve the x, y, z
  distribution of the shoulder orientation
• R orientation of each retrieval frames
• MR, MQ mean orientation of the retrieval and
  query motion respectively
• standard deviation of the retrieval
  and query motion respectively

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Assembling different partial motion
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Assembling different partial motion

• After tuning

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Results
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Conclusions Future work

• Conclusions
• A simple and intuitive editing tool
• We use the logical similar to retrieve the
  partial figure form different motions
• By assembling the partial figures to enrich the
  database
• Future work
• adding more features to retrieve
• Improve the tuning method

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• Question?