Technical Program

Paper Detail

Session:Multimedia Communication, Networking and Security II
Time:Friday, May 21, 15:30 - 17:30
Presentation: Poster
Topic: Multimedia Signal Processing: Multimedia Security and Privacy
Authors: Phil Sherry; Rochester Institute of Technology 
 Andreas Savakis; Rochester Institute of Technology 
Abstract: Watermarking schemes that have been developed for continuous tone images cannot be directly applied to halftone images. Many of these watermarking methods require characteristics implicit in continuous tone images but absent from halftones. With this in mind, it seems reasonable to have a robust watermarking technique specific to halftones, equipped to work in the binary image domain. This paper reviews existing techniques and suggests improvements to increase performance and overcome limitations of existing techniques. The first set of post-halftone watermarking methods work on existing halftones. Data Hiding Cell Parity (DHCP) works in the parity domain instead of individual pixels. Data Hiding Mask Toggling (DHMT) works by encoding two bits in the 2x2 neighborhood of a pseudorandom location. Dispersed Pseudorandom Generator (DPRG), on the other hand, is a preprocessing method that takes place before halftoning. DPRG uses a dispersed pseudorandom generator that achieved better visual results. Using the Modified Peak Signal-to-Noise Ratio (MPSNR) metric, the proposed techniques outperform existing methods by up to 5-15%, depending on the image type and method considered.

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