Data hiding method and data extracting method

Details Data hiding method and data extracting method Data hiding method and data extracting method

H - Electricity

04

K

H04K 1/02 (2006.01) G06T 1/00 (2006.01) H04N 1/32 (2006.01) H04N 5/913 (2006.01) H04N 7/08 (2006.01)

Patent

CA 2220816

To hide message information into media information in frequency space. With this, it is the objective of the present invention to provide a data hiding method which has high resistance to removal or change of message information embedded into media information and which continues to effectively maintain hidden message information even when signal processing is performed by employing a frequency filter. In order to hide message information (m) into media information (M), the frequency transform of the message information (m) and the media information (M) are performed, and frequency spectra f1 and f2 are obtained. Next, from the frequency spectrum f2 of the message information (m), a region containing feature frequency components representative of the features of the message information (m) in real space is extracted as the base region B. Then, n copies of the base region B are generated, and in frequency space, the n copies are dispersedly arranged. Also, by making the frequency components other than that equal to zero, a frequency spectrum f3 is generated as intermediate information. Finally, the frequency spectrum f3 and the frequency spectrum f, are added, and by performing the inverse frequency transform of the result, the message information (m) can be hidden into the media information (M).

La présente invention est une méthode servant à dissimuler des messages dans l'espace des fréquences utilisé pour des informations. Elle vise à procurer une méthode de dissimulation de données fortement protégée contre les extractions ou les modifications qui maintient cette dissimulation de façon efficace même en cas de traitement des signaux au moyen d'un filtre fréquentiel. Pour dissimuler un message (m) dans des informations (M), on effectue des transformations de fréquence du message (m) et des informations (M) et l'on obtient les spectres de fréquence f2 et f1 correspondants. Ensuite, on choisit dans le spectre de fréquence f2 du message (m), comme région de base B, une région contenant des fréquences représentatives des caractéristiques du message (m) dans l'espace réel. On crée ensuite n copies de la région de base B que l'on disperse dans l'espace des fréquences. On crée également un spectre de fréquence f3 comme information intermédiaire. Finalement, on additionne les spectres de fréquence f3 et f et on peut dissimuler le message (m) dans les informations (M) en effectuant la transformation de fréquence inverse sur le résultat de l'addition.

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