1. Picode: A New Picture-Embedding 2D Barcode
Source: IEEE Transactions on Image Processing, Vol. 25, No. 8, 2016.
Authors: Chen Changsheng, Huang Wenjian, Zhou Baojian,
Liu Chenchen, Mow Wai Ho
Speaker: Huang Peng-Cheng
Date: 9/20/2018

2. Outline
Introduction
Proposed Scheme
Experiment Results
Conclusion

3. Introduction(1/2)

5. Proposed Scheme(1/7)
The block diagrams of the PiCode encoding procedures.

6. Proposed Scheme(2/7)
The block diagrams of the PiCode decoding procedures.

7. Proposed Scheme(3/7) 1. PiCode Encoding
∆𝐼= ×25+ ∈ 0 / ∈ 1
=5∗25+ ∈ 0 / ∈ 1
𝑅=3
∆𝐼 ∗3 𝑖𝑛𝑛𝑒𝑟
∆𝐼 3 ∗12 (𝑜𝑢𝑡𝑒𝑟)

8. Proposed Scheme(4/7) 2. PiCode Decoding
----Coarse-fine corner detection

9. Proposed Scheme(5/7) 2. PiCode Decoding
---Module Alignment

10. Proposed Scheme(6/7) 2. PiCode Decoding

11. Proposed Scheme(7/7) 2. PiCode Decoding
△1 and △2 are set as 50% and 150% of the median contrast of all modules in the barcode image, respectively.

12. Experiment Results(1/7)
multi-scale structural similarity (MS-SSIM) metric
A. Perceptual Quality

13. Experiment Results(2/7)
B. Decoding Robustness

14. Experiment Results(3/7)

15. Experiment Results(4/7)

16. Experiment Results(5/7)

17. Experiment Results(6/7)
C. Effect of Varying Embedding Intensity λ

18. Experiment Results(7/7)
D. PC and Mobile Implementations

19. Conclusion
it provides one of the best perceptual quality in preserving the aesthetic appearance of the embedded image, while maintains the decoding robustness.

20. comments Low reliability;
Improving the Modulation process, for a better visual quality.