초록 ▼

An identification code signal is hidden in a carrier signal (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned. The carrier signal can thereby be identified, or some machine responsive action can thereby be taken. In one

An identification code signal is hidden in a carrier signal (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned. The carrier signal can thereby be identified, or some machine responsive action can thereby be taken. In one image steganography embodiment, the relative strength of the identification code signal is both perceptually adapted in accordance with psychovisual characteristics of the image, and globally scaled in accordance with a user-set visibility control. The technique can be applied in video imagery embodiments to control associated video equipment, e.g. to serve as a copy control signal.

대표청구항 ▼

[ I claim:] [1.] A method of processing input image data to steganographically encode a multi-bit identification code therein, thereby producing output image data, characterized by:defining a global scaling parameter;algorithmically determining, from the input image data, a first parameter for each

[ I claim:] [1.] A method of processing input image data to steganographically encode a multi-bit identification code therein, thereby producing output image data, characterized by:defining a global scaling parameter;algorithmically determining, from the input image data, a first parameter for each of a first plurality of portions of the image data, said first parameter relating to the relative capability of said portion to conceal encoding thereof by the identification code;encoding the identification code through a second plurality of portions of the image data to produce the output image data, said second plurality being a subset of the first plurality, the code in each of said second plurality of portions being encoded in accordance with both the first parameter corresponding to said each portion, and said global scaling parameter;wherein the relative strength of the identification code through different portions of the output image changes both in accordance with characteristics of the input image, and globally in accordance with a global scale factor.