IEEE Trans Image Process - Orientation modulation for data hiding in clustered-dot halftone prints.

Tópicos

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Resumo

We present a new framework for data hiding in images printed with clustered dot halftones. Our application scenario, like other hardcopy embedding methods, encounters fundamental challenges due to extreme bilevel quantization inherent in halftoning, the stringent requirements of image fidelity, and other unavoidable printing and scanning distortions. To overcome these challenges, while still allowing for automated extraction of the embedded data and a high embedding capacity, we propose a number of innovations. First, we perform the embedding jointly with the halftoning by employing an analytical halftone threshold function that allows steering of the halftone spot orientation within each halftone cell based upon embedded data. In this process, image fidelity is emphasized and, if necessary, the capability to recover individual data values is sacrificed resulting in unavoidable erasures and errors. To overcome these and other sources of errors, we propose a suitable data detection and error control methodology based upon a statistical representation for the print-scan channel that effectively models the channel dependence upon the cover image gray-level. To combat the geometric distortion inherent in the print-scan process, we exploit the periodic halftone structure to recover from global scaling and rotation and propose a novel decision directed synchronization technique that counters locally varying printing distortion. Experimental results demonstrate the power of the proposed framework: we achieve high operational rates while preserving halftone image quality.

Resumo Limpo

present new framework data hide imag print cluster dot halfton applic scenario like hardcopi embed method encount fundament challeng due extrem bilevel quantiz inher halfton stringent requir imag fidel unavoid print scan distort overcom challeng still allow autom extract embed data high embed capac propos number innov first perform embed joint halfton employ analyt halfton threshold function allow steer halfton spot orient within halfton cell base upon embed data process imag fidel emphas necessari capabl recov individu data valu sacrif result unavoid erasur error overcom sourc error propos suitabl data detect error control methodolog base upon statist represent printscan channel effect model channel depend upon cover imag graylevel combat geometr distort inher printscan process exploit period halfton structur recov global scale rotat propos novel decis direct synchron techniqu counter local vari print distort experiment result demonstr power propos framework achiev high oper rate preserv halfton imag qualiti

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