Halftone Visual Cryptography

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Halftone Visual Cryptography IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 15, NO. 8, AUGUST 2006, pp. 2441-2453 Zhi Zhou, Gonzalo R. Arce, and Giovanni Di Crescenzo Reporter: Jen-Bang Feng

Visual Cryptography + = + =

Visual Cryptography

The Proposed Scheme

Comparisons EX. Block size: 4*4 m = 2 PSNR = 9.03

Results (2, 3)-threshold (b) (e) extended VC (c) (d) (f) proposed

Results

watermark Stacking EDF2 EDF1 EDF1 Lena (gray level) Error diffusion Data Hiding in Halftone Images With Noise-Balanced Error Diffusion Soo-Chang Pei, and Jing-Ming Guo IEEE Signal Processing Letters, Vol.10, No.12, December 2003 Steganography in halftone images:conjugate error diffusion Ming Sun Fu, Oscar C. Au Signal Processing 83 (2003) 2171 – 2178

+ Watermark Stacking * Original Lena Hybrid Pixel-Based Data Hiding and Block-Based Watermarking for Error-Diffused Halftone Images Soo-Chang Pei (貝蘇章) and Jing-Ming Guo IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 13, NO. 8, AUGUST 2003, Pages: 867-884. EDF 1 Watermark + Stacking EDF 2 * NBEDF Original Lena

Conclusions and Comments Applying VC to halftone images Classify: During process Outside process