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Featuring the GEMEP Corpus

Experiences and Future Plans

Hannes Pirker

OFAI, Vienna

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Overview

• Features from Audio Channel• Segments and pitch contours

• Features from Video Channel• Faces, silhouettes and hands

• Discussion• What we do have & what we need

© ÖFAI, Wien 3

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Features from Audio Channel

• Phonetic segmentation into• Phonemes• Syllables

• Pitch Extraction

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Speech AnalysisPhonetic Segmentation

• Phonetic segmentation works quite good (forced alignment with HTK)• Bootstrapping circle with

• Manual labelling of training data

• Training of HMMs

• Automatic alignment

• Manual correction of alignment results

• Re-training of HMMs

• Processed data: Typ 1 sentences (Ne kal ibam sud molen)

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Speech AnalysisPitch Extraction

Testing different pitch extraction methods from SFS (Mark Huckvale, UCL)

• Promising results with fine-tuning of parameters for contour-smoothing & high-pitch correction

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Sample 06joi112

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Features from Video Channel

• Face detection

• Silhouettes & Bounding Boxes

• Hand tracking

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FaceDetection Using openCV

• Feature based face detection with pre-trained cascaded classifier

• (almost) ‘out of the box’

• Very good results under close-to-optimal conditions

© ÖFAI, Wien 9

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FaceDetection Using openCV

• Feature based face detection with pre-trained cascaded classifier

Clip:06joi112

© ÖFAI, Wien 10

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Silhouettes & Bounding Boxes

• Combing silhouettes & bounding boxes in frontal and sideview as simple & robust estimator of• Dynamics of movements• Amount of expansion

© ÖFAI, Wien 11

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Silhouettes & Bounding Boxes

• Combing silhouettes & bounding boxes in frontal and sideview as simple & robust estimator

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1st Results: 3D Bounding Box Volume per Emotion – Actor 01

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1st Results: 3D Bounding Box Volume per Emotion – Actor 07

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3D Bounding Box Volume: JOI vs. TRI / Actor 01 vs. Actor 06

ACTOR 01 ACTOR 06

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Temporal Dynamics: Plotting BoundingBox & Speech-Timing

Clip:06joi112

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Hand Tracking

• Find skin areas in 1st frame

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Hand Tracking

• Find skin areas in 1st frame

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Hand Tracking

• Find skin areas in 1st frame

• Find hand & use center of area as hand position

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Hand Tracking

• Find skin areas in 1st frame

• Find hand & use center of area as hand position

• Interactively accept or correct

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Hand Tracking

• Find skin areas in 1st frame

• Find hand & use center of area as hand position

• Interactively accept or correct

• Perform automatic tracking (using mean shift algorithm)

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Hand Tracking

• Perform automatic tracking (using mean shift algorithm)

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Hand Tracking

• Perform automatic tracking (using mean shift algorithm)

• Interactively classify quality of tracking • The GOOD (70%)• The BAD (15%)• The UGLY (15%)

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Different Actors – Different Results

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Different Actors – Different ResultsDifficult

Easier

© ÖFAI, Wien 25

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Discussion

• What have we gained?

• What do we need?

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Investigations 1: Interaction

• Influence of Affect on Gesture AND speech• Activation dimension should be

reflected in speech and body movement in a parallel way. i.e. look at speed, effort etc.

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Investigations 1: Interaction

• Influence of Affect on Gesture AND speech• Activation dimension should be

reflected in speech and body movement in a parallel way. i.e. look at speed, effort etc.

Data already usable

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Investigations 2: Timing

• Temporal aspects • Look at the relative timing of

speech and non-verbal signals, e.g. The location of strokes in relation to accented syllables

© ÖFAI, Wien 29

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Timing:Traditional Anchor points in Speech

• Borders of • Syllables • Words• (Prosodic and Syntactic) Phrases• Utterances• Turns

• Location of • Pauses• (Pitch) Accents

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Timing:Traditional Anchor points in Speech

• Borders of • Syllables +++• Words +++• (Prosodic & Syntactic) Phrases + -• Utterances +?• Turns --

• Location of • Pauses +• (Pitch) Accents + --

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Temporal alignmentTraditional Anchor points in

Gestures

•Prepare

•Stroke

•Hold

•Retract

(Graphics by A. Marshall http://twiki.isi.edu/Public/BML_Specification)

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Temporal alignmentTraditional Anchor points in

Gestures

Phases difficult to obtain, but general information on dynamics available

(Graphics by A. Marshall http://twiki.isi.edu/Public/BML_Specification)

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Investigations 3: Bodily Expression of Emotion

• Relevant Features (cf Wallbott 1998):

• Upper Body: away from camera, collapsed

• Shoulders: up, backward, forward • Head: down, back, turned or bent• Arms: lateral, stretched out

frontal/sideways, crossed

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Int

ellig

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of Emotion

• Relevant Features (cf Wallbott 1998):

• Hand-form: fist(s), opening/closing• Movement Qualities:

Activity,Expansiveness, Dynamics/Energy/Power

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Investigations 3: Bodily Expression of Emotion

• Relevant Features (cf Wallbott 1998):

Data currently focussing on hand location. Upper-body and posture not directly assessed.Movement qualities partially accessible

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What we DO have by Now

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What we might WANT to have?

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Possible Representations

• H-ANIM/MPEG-4-style• joint angles

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Possible Representations

• H-ANIM/MPEG-4-style• joint angles

• Gesticon/MURML/HamNoSys-style• wrist position in relation to body• encoding of the stroke-phase etc.

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Possible Representations

• Less ambitious• Symmetric/Assymetric• Extended/Collapsed• Static/Dynamic• …

• In any case: Need to relate pixel-numbers to anthropomorphic measures!

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Possible Representations

• Also consider (manually supported) classification into prototypical classes

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Summary

• Numerous possibilities for improvements, e.g., in hand tracking (but is it necessary?)

• Rather concentrating on representations in order to ensure data really is useful and re-usable (e.g. ECAs)

© ÖFAI, Wien 43

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Summary

Time to bundle expertises and distribute efforts within

© ÖFAI, Wien 44

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Thanks for your attention