초록 ▼

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; improv

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 transmissions, photo duplication kiosks with automatic copyright detection, and hotlinked image objects (e.g. with embedded URLs) for use on the internet.

대표청구항 ▼

[ I claim:] [1.] A multi-computer system including a network for embedding and reading a watermark, the system comprising:a first digital electrical computer system comprising a first digital electrical computer electrically connected to a first input device, to a first output device, and to a first

[ I claim:] [1.] A multi-computer system including a network for embedding and reading a watermark, the system comprising:a first digital electrical computer system comprising a first digital electrical computer electrically connected to a first input device, to a first output device, and to a first memory storing a plurality of creator identifiers and creator contact data corresponding to each of the creator identifiers;a second digital electrical computer system comprising a second digital electrical computer electrically connected to a second input device and to a second output device, the second digital electrical computer being programmed to embed a watermark in a digital photographic image, the watermark including one of the plurality of creator identifiers;a third digital electrical computer system comprising a third digital electrical computer electrically connected to a third input device and to a third output device, the third digital electrical computer being programmed to read the watermark in the digital photographic image to reveal the one of the plurality of creator identifiers;a network for communicating the revealed one of the plurality of creator identifiers to the first digital electrical computer to obtain the creator contact data corresponding to the one of the plurality of creator identifiers from the memory.