The document discusses the creation of a virtual window using curtains and image projection to address issues related to limited space in rooms. It proposes a system utilizing a webcam, projector, and software to calculate curtain opening areas for effective spatial presentation. Limitations include the need for luminance difference between the projected content and the curtain for optimal image quality.

1. A Virtual Window using Curtains and Image Projection
Keio University
Naoharu Sawada, Takumi Yamamoto, Yuta Sugiura
APMAR2023

2. 2
Background
• Lack of space in the room
• Sense of being blocked in
• Spatial presentation
• Use of mirrors in interior design
• Arrange furniture to improve openness

3. 3
Related Work
Expanding window shade
［T. Homma, 2021］
Interactive system using shojis
［Y. Nakahara, 2010］
Methods focused on
the role of curtains
Smart curtain
［T. Takashina, 2015］
Smooth curtain
［T. Handa, 2009］
Presenting information
using everyday items

4. • Install screens and curtains on the walls
• Project images onto the open areas of the curtains
4
Proposal
Screen and Curtain
creating a virtual window to produce a spatial presentation

5. 5
Movie of the virtual window

6. 6
External Window

7. 7
Indoor windows between rooms

8. 8
System configuration
Overview
PC
webcam projector
projection
contents
camera
images
webcam projector
• Use a webcam, a projector and a PC

9. • Calculate the opening area of the curtains
• The background subtraction method
9
Software (1/2)
Background image
Input
Mask image
Window view image
⊝ ⊕
Output

10. • Allows the camera and projector to be placed in any position
• UI
10
Software (2/2)
Camera image
Projected onto
the screen area
Deicide the projection position
Extract the screen area
Range of the projector
Output is projected only
onto the screen area

11. • Need difference in the luminance between the screen and the curtain
• The background subtraction method
• Obstacles affect the projected image
11
Limitation and Future Work

12. 12
Summary
Background Lack of space in the room, Spatial presentation
Related Work
Presenting information using everyday items,
Methods focused on the role of curtains
Proposal creating a virtual window to produce a spatial presentation
Application External window, Indoor window between rooms
Implementation
Calculate the opening area of the curtains,
Camera image processing
Limitation Need difference in the luminance between the screen and the curtain

13. Supplemental Slides
13

14. • Changeable
• size / position
• Cost
• Quality of an image
• Occlusion
14
Comparison with Display
Changed the size and position

15. 15
[1] T. Homma, M. Oki, K. Tsukada, Proposal and application of information presentation technique by expanding window shade,
volume 62, 2021, pp. 713–726. (in Japanese).
[2] Y. Nakahara, S. Mizuno, Development of an interactive system using shojis, 2017, pp. 771–773. (in Japanese).
[3] T. Handa, Smooth curtain: privacy controlling video communication device, 2009. (in Japanese).
[4] T. Takashina, K. Aoki, A. Maekawa, C. Tsukamoto, H. Kawai, Y. Yamariku, K. Tsuruta, M. Shimokawa, Y. Kokumai, H. Koike, Smart
curtain as interactive display in living space, in: SIGGRAPH Asia 2015 Posters (SA ’15), 32, Association for Computing Machinery, New
York, NY, USA, 2015,y
Reference