Epfl pavel-korshunov-lightening

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multimediaeval

Geometrical Privacy
Protection Tool
Pavel Korshunov  
Touradj Ebrahimi
EPFL, Switzerland

Challenges
§  Keep the balance between
-  Privacy and intelligibility
-  Privacy and appropriateness
§  Make the protection reversible
§  How to protect different regions?
2

Reversible protection 1
•  Body
silhouettes
•  Warping
protection
3

Reversible protection 2
•  Faces and
accessories
•  Morphing
protection
4

Standard face

Face to protect

Morphed result

Use this face
instead of the
original

Triangulation points

Morphing parameters

Algorithm

Standard face

Recovered

Making pleasant
•  Morph
– Faces to smileys
– Backpack
– Bag
5

Evaluation results
8

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

Conclusions
•  Privacy is high
•  Intelligibility is OK
•  Professional evaluators do not like it
•  Who does not like a smiley?
9

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Epfl pavel-korshunov-lightening

1. Geometrical Privacy Protection Tool Pavel Korshunov   Touradj Ebrahimi EPFL, Switzerland

2. Challenges §  Keep the balance between -  Privacy and intelligibility -  Privacy and appropriateness §  Make the protection reversible §  How to protect different regions? 2

3. Reversible protection 1 •  Body silhouettes •  Warping protection 3

4. Reversible protection 2 •  Faces and accessories •  Morphing protection 4 Standard face Face to protect Morphed result Use this face instead of the original Triangulation points Morphing parameters Algorithm Standard face Recovered

5. Making pleasant •  Morph – Faces to smileys – Backpack – Bag 5

6. 6

7. 7

8. Evaluation results 8 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

9. Conclusions •  Privacy is high •  Intelligibility is OK •  Professional evaluators do not like it •  Who does not like a smiley? 9

Epfl pavel-korshunov-lightening

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