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Unphotogenic Light
High-Speed Projection Method to Prevent
Secret Photography by Small Cameras
Ippei Suzuki Undergraduate Student, University of Tsukuba
Yoichi Ochiai Assistant Professor, University of Tsukuba
Emerging Technologies Talk: Magic of Light
3
Introduction Content Protection on the Screen
Content Protection on the Screen = Difficult Problem
4
Introduction Content Protection on the Screen
Content Protection on the Screen = Difficult Problem
Copy
Analog/Digital Copy Guard Techniques
They can take photos !
5
Introduction Content Protection on the Screen
Visible
to
Human Eyes
Recordable
by
Cameras
6
Introduction Content Protection on the Screen
7
Introduction Practical Stories of the Proposed Method
When you would like to protect
this projected image from secret photography...
Situation
8
Introduction Practical Stories of the Proposed Method
Solution A: Visible Watermarks or Protection Marks
CONFIDENTIAL
COPYRIGHT
NO PHOTOS
CONFIDENTIAL
COPYRIGHT
NO PHOTOS
9
Introduction Practical Stories of the Proposed Method
Solution A: Visible Watermarks or Protection Marks
Bad Experience for Visitors… "
Security Check Area
10
Introduction Practical Stories of the Proposed Method
Solution B: Confiscate Camera Devices
Security Man
Visitor Visitor’s Bag
Confiscated Camera
11
Introduction Practical Stories of the Proposed Method
Solution B: Confiscate Camera Devices
Visitor
Security
Don’t use cameras!!!
12
Introduction Practical Stories of the Proposed Method
Solution B: Confiscate Camera Devices
Visitor’s
Pocket
Visitor
Secret Camera
e.g., Pen-Shaped Small Camera
They can take photos !
13
Introduction Target in This Study
Our Target
http://amzn.asia/etlTVOj “Google Glass” by lawrencegs (CC BY 2.0) “iPhone 7 Plus” by Kārlis Dambrāns from Latvia (CC BY 2.0) “Sony Alpha A77” by SkywalkerPL (CC BY 3.0)
Not considered in ours
Kinds of the camera which criminals may use
(Pen-shaped
camera)
14
Introduction Goal
Human eyes can see Cameras cannot see
= Unphotogenic
15
Introduction Solution
<
Temporal Resolution
16
Related Work
VRCodes [Woo et al. 2012]Detection of Imperceptible On-Screen Markers
with Unsynchronized Cameras
[Sampaio et al. 2015]
Invisible Markers on Screen
17
Method Apploach
Afterimage Effect
An impression of a vivid sensation retained after the stimulus has ceased
18
Method Apploach
19
Method Apploach
Divide Image
Switch
in High Refresh Rate
20
Method Theory and Effect of The proposed System
Frame DivisionSource Image
Frame Period
Suitable Shutter Speed & Timings
Time
Projected
Image
Flame No.
Assigned
0 1 2 3
Recorded
Image
Shutter
Projection Period
Incomplete Shutter Speed & Timings Examples
21
Result Evaluation from camera vision
DSLR
Smartphone
Variable Aperture
Fixed Aperture
SS 1/30, F20
SS 1/45, F2.2
SS 1/125, F10 SS 1/320, F6.3
SS 1/1000, F2.2SS 1/160, F2.2
Apple iPhone 6, with App “ProShot” by Rise Up Games LLC. All photos were taken by F/2.2, Not changeable the F-stops value.
Canon EOS Kiss X4 with TAMRON B005 17-50 mm F/2.8, All photos were taken by ISO 100
Cannot change the apearture
22
Method Theory and Effect of The proposed System
Visitor
Security
Don’t use cameras!!!
Combination of the human power and our system
23
Result Evaluation from camera vision
kvy37; Kyocera Corp.
Qua phone
ZE551ML; ASUSTeK Computer Inc.
ZenFone 2
A500KL; ASUSTeK Computer Inc.
ZenFone 5
SO-01F, Sony Corp.
Xperia Z1
DSC-W110, Sony Corp.
Cyber-shot
CCD Image Sensor
(Global Shutter)
*Photos are taken with the default automatic mode.
24
Application Other examples than displaying divided images
EXIT
$10
Theme Park
Photo by Ted Murphy (CC BY 2.0) Photo by Ted Murphy (CC BY 2.0)
Result
Overlay onto the photos sold near the exit of the attraction
25
Application Other examples than displaying divided images
Museum
Result
Overlay onto the artworks
Projector
Artwork
26
Discussion Limitation and Future Work
Avoidance by merging multiple photos
Color image
Optimization the division pattern
Applicability for the video contents
FAQ
2. Could the system show the video as projection image?
3. Could the system show the video as blurred patterns?
1. Can I use my own logo for division pattern?
4. Can the system increase the number of the division?
Unphotogenic Light
Please visit our booth! and let’s try to take photo by your smartphone!!
— Yes in principle, under development
— Difficult. Changes of the division pattern are easily perceived by people.
— Yes, 2-bit image only because it should divide areas
— Yes, but decrease the brightness of the screen

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Unphotogenic Light - SIGGRAPH Asia 2017 (E-tech Talk by Ippei Suzuki)

  • 1. Unphotogenic Light High-Speed Projection Method to Prevent Secret Photography by Small Cameras Ippei Suzuki Undergraduate Student, University of Tsukuba Yoichi Ochiai Assistant Professor, University of Tsukuba Emerging Technologies Talk: Magic of Light
  • 2.
  • 3. 3 Introduction Content Protection on the Screen Content Protection on the Screen = Difficult Problem
  • 4. 4 Introduction Content Protection on the Screen Content Protection on the Screen = Difficult Problem Copy Analog/Digital Copy Guard Techniques They can take photos !
  • 5. 5 Introduction Content Protection on the Screen Visible to Human Eyes Recordable by Cameras
  • 7. 7 Introduction Practical Stories of the Proposed Method When you would like to protect this projected image from secret photography... Situation
  • 8. 8 Introduction Practical Stories of the Proposed Method Solution A: Visible Watermarks or Protection Marks CONFIDENTIAL COPYRIGHT NO PHOTOS
  • 9. CONFIDENTIAL COPYRIGHT NO PHOTOS 9 Introduction Practical Stories of the Proposed Method Solution A: Visible Watermarks or Protection Marks Bad Experience for Visitors… "
  • 10. Security Check Area 10 Introduction Practical Stories of the Proposed Method Solution B: Confiscate Camera Devices Security Man Visitor Visitor’s Bag Confiscated Camera
  • 11. 11 Introduction Practical Stories of the Proposed Method Solution B: Confiscate Camera Devices Visitor Security Don’t use cameras!!!
  • 12. 12 Introduction Practical Stories of the Proposed Method Solution B: Confiscate Camera Devices Visitor’s Pocket Visitor Secret Camera e.g., Pen-Shaped Small Camera They can take photos !
  • 13. 13 Introduction Target in This Study Our Target http://amzn.asia/etlTVOj “Google Glass” by lawrencegs (CC BY 2.0) “iPhone 7 Plus” by Kārlis Dambrāns from Latvia (CC BY 2.0) “Sony Alpha A77” by SkywalkerPL (CC BY 3.0) Not considered in ours Kinds of the camera which criminals may use (Pen-shaped camera)
  • 14. 14 Introduction Goal Human eyes can see Cameras cannot see = Unphotogenic
  • 16. 16 Related Work VRCodes [Woo et al. 2012]Detection of Imperceptible On-Screen Markers with Unsynchronized Cameras [Sampaio et al. 2015] Invisible Markers on Screen
  • 17. 17 Method Apploach Afterimage Effect An impression of a vivid sensation retained after the stimulus has ceased
  • 20. 20 Method Theory and Effect of The proposed System Frame DivisionSource Image Frame Period Suitable Shutter Speed & Timings Time Projected Image Flame No. Assigned 0 1 2 3 Recorded Image Shutter Projection Period Incomplete Shutter Speed & Timings Examples
  • 21. 21 Result Evaluation from camera vision DSLR Smartphone Variable Aperture Fixed Aperture SS 1/30, F20 SS 1/45, F2.2 SS 1/125, F10 SS 1/320, F6.3 SS 1/1000, F2.2SS 1/160, F2.2 Apple iPhone 6, with App “ProShot” by Rise Up Games LLC. All photos were taken by F/2.2, Not changeable the F-stops value. Canon EOS Kiss X4 with TAMRON B005 17-50 mm F/2.8, All photos were taken by ISO 100 Cannot change the apearture
  • 22. 22 Method Theory and Effect of The proposed System Visitor Security Don’t use cameras!!! Combination of the human power and our system
  • 23. 23 Result Evaluation from camera vision kvy37; Kyocera Corp. Qua phone ZE551ML; ASUSTeK Computer Inc. ZenFone 2 A500KL; ASUSTeK Computer Inc. ZenFone 5 SO-01F, Sony Corp. Xperia Z1 DSC-W110, Sony Corp. Cyber-shot CCD Image Sensor (Global Shutter) *Photos are taken with the default automatic mode.
  • 24. 24 Application Other examples than displaying divided images EXIT $10 Theme Park Photo by Ted Murphy (CC BY 2.0) Photo by Ted Murphy (CC BY 2.0) Result Overlay onto the photos sold near the exit of the attraction
  • 25. 25 Application Other examples than displaying divided images Museum Result Overlay onto the artworks Projector Artwork
  • 26. 26 Discussion Limitation and Future Work Avoidance by merging multiple photos Color image Optimization the division pattern Applicability for the video contents
  • 27.
  • 28. FAQ 2. Could the system show the video as projection image? 3. Could the system show the video as blurred patterns? 1. Can I use my own logo for division pattern? 4. Can the system increase the number of the division? Unphotogenic Light Please visit our booth! and let’s try to take photo by your smartphone!! — Yes in principle, under development — Difficult. Changes of the division pattern are easily perceived by people. — Yes, 2-bit image only because it should divide areas — Yes, but decrease the brightness of the screen