Embedding Context with Photographic Steganography

Wenjia Yuan

2

Motivation

• QR codes

3

Photometric model

• Distortions in the visual MIMO channel– Geometric distortion– Angular distortion– Specularity distortion

4

Photometric model

𝐼 𝑜∝∫𝜆

❑

[𝜌 ⋅ 𝑓 (𝜃 ,𝜆 ) ]𝑠 (𝜆)ⅆ 𝜆

5

Photometric modelOriginal Original EmbeddedEmbedded

Division Division

6

Photographic steganography

• Photometric ratio

𝐼 1∝∫𝜆

❑

[𝜌 ⋅ 𝑓 (𝜃 , 𝜆 )] 𝑠(𝜆)ⅆ 𝜆

𝐼 2∝∫𝜆

❑

[𝜅 𝜌 ⋅ 𝑓 (𝜃 , 𝜆 )] 𝑠(𝜆)ⅆ 𝜆

𝐼2𝐼1

=𝜅

7

Photographic steganography

• Receiver

Min-Group

Min-Group Binary matrix

8

Photographic steganography

• Min-Group method for reflection removal

9

Experiments

• Indoor

10

Experiments

• Outdoor

11

Conclusions

• Develop a model for image formation of an active scene containing electronic displays

• Present real-time photographic steganography for visual MIMO optical system.