Steganography systems

Systemes de steganographie

Abstract

L'invention a pour objet diverses améliorations et applications dans le domaine de la stéganographie. Ces améliorations consistent à faciliter la mise à l'échelle et l'enregistrement de la rotation, pour le décodage stéganographique, à l'aide de motifs encastrés de manière stéganographique, symétriques en rotation, et de graticules numériques subliminaux. Ces améliorations consistent aussi en techniques améliorées de décodage sans accès aux originaux non codés; Elles consistent également à améliorer la résistance du codage stéganographique dans les images en mouvement et/ou en présence de compression/décompression à pertes; et à représenter les données par des configurations de cellules binaires dont l'énergie dans le domaine spatial facilite l'enregistrement du décodage. Les applications comprennent l'amélioration de la sécurité des transactions financières, des cartes d'identification résistant aux contrefaçons, des systèmes de protection contre les fraudes pour la téléphonie cellulaire, des canaux de modem secrets dans les transmissions vidéo, des kiosques de reproduction de photos à système de détection automatique de droits d'auteurs, et des objets images à liaison électronique (par exemple, avec des localisateurs URL encastrés) destinés à être utilisés sur Internet.
Various improvements to steganographic systems, and applications therefore, are disclosed. The improvements include facilitating scale and rotation registration for steganographic decoding by use of rotationally symmetric steganographically embedded patterns and subliminal digital graticules; improved techniques for decoding without access to unencoded originals; improving robustness of steganographic coding in motion pictures and/or in the presence of lossy compression/decompression; and representing data by patterned bit cells whose energy in the spatial domain facilitates decoding registration. Applications include enhanced-security financial transactions, counterfeit resistant identification cards, fraud deterrent systems for cellular telephony, covert modem channels in video transmission, photo duplication kiosks with automatic copyright detection, and hotlinked image objects (e.g. with embedded URLs) for use on the internet.

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