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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0436098 (1995-05-08) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 721 인용 특허 : 0 |
An identification code signal is impressed on a carrier to be identified (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned and the carrier thereby identified. The method and apparatus are characterized by robustness desp
An identification code signal is impressed on a carrier to be identified (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned and the carrier thereby identified. The method and apparatus are characterized by robustness despite degradation of the encoded carrier, and by permeation of the identification signal throughout the carrier.
A method of steganographic encoding characterized by: processing a sampled input signal to produce an output signal having an information signal embedded therein, the sampled input signal corresponding to a two dimensional visual image, each sample of said input signal having a value, the encoding i
A method of steganographic encoding characterized by: processing a sampled input signal to produce an output signal having an information signal embedded therein, the sampled input signal corresponding to a two dimensional visual image, each sample of said input signal having a value, the encoding including changing at least certain of said input signal sample values to encode the information signal therein, encoding a calibration signal in the output signal together with said information signal, said calibration signal including data corresponding to a predetermined geometrical pattern, said calibration signal having known properties facilitating identification thereof by a recipient of the encoded signal, said encoded calibration signal being substantially imperceptible to a human viewer of the encoded visual image, said predetermined geometrical pattern including a plurality of rotationally symmetric component pattern elements, wherein there exists at least first and second rotational orientations of said image for which at least one of said component pattern elements, as embedded in the output signal, has the same orientation.
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