epfl pavel-korshunov-lightening
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Geometrical Privacy Protection Tool
Pavel Korshunov Touradj Ebrahimi
EPFL, Switzerland
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Challenges § Keep the balance between
- Privacy and intelligibility - Privacy and appropriateness
§ Make the protection reversible § How to protect different regions?
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Reversible protection 1 • Body
silhouettes
• Warping protection
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Reversible protection 2 • Faces and
accessories
• Morphing protection
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Standard face Face to protect
Morphed result
Use this face instead of the original
Triangulation points Morphing parameters���
Algorithm Standard face���
Recovered
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Making pleasant • Morph – Faces to smileys – Backpack – Bag
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Evaluation results
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51
73.2
23.6
61.6 67.7
40.7
57.3 59.5
46.3
0 10 20 30 40 50 60 70 80 90
100
Privacy Intelligibility Appropriateness Crowdsourcing Stakeholders Practitioners
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Conclusions • Privacy is high • Intelligibility is OK • Professional evaluators do not like it
• Who does not like a smiley?
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