최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0560976 (2000-04-28) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 | 피인용 횟수 : 227 인용 특허 : 312 |
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.
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. the plurality of data symbols in the response to the controller, the controller being responsive to the data channel condition. 8. The communication device of claim 5 wherein the data transformer selects a predetermined correlation between successive ones of a plurality of transmission symbols in the response to the channel condition, according to a preselected coding method. 9. The communication device of claim 8, wherein the communication device is a transmitter, the data transformer imparts the predetermined correlation between the successive ones of the plurality of data symbols, the predetermined data bit rate is at least one of a non-power of two and a non-integer, the transmission symbol is representable by a plurality of symbol constellations, and the preselected coding method is constellation-multiplexed coding. 10. The communication device of claim 9, wherein the data transformer further comprises: a. a bit parser grouping ones of the first predetermined integer number of data bits into selected ones of the selectable integer plurality of data bit vectors and ones of the second predetermined integer number of data bits into selected others of the selectable integer plurality of data bit vectors, the bit parser being governed by the controller; and b. a constellation mapper mapping the at least one data symbol into the transmission symbol, the constellation mapper mapping in response to the controller, the controller being responsive to the data channel condition. 11. The communication device of claim 10, further comprising an encoder operably interposed between the bit parser and the constellation mapper, the encoder encoding, in the response to the controller, the at least one data symbol into the transmission symbol and imparting the predetermined correlation thereupon, the controller being responsive to the data channel condition. 12. The communication device of claim 11 wherein the encoder is a convolutional encoder. 13. The communication device of claim 10 further comprising a bit buffer operably connected with the bit parser and the constellation mapper for buffering a selectable group of data symbols. 14. The communication device of claim 13, further comprising an encoder operably interposed between the bit buffer and the constellation mapper, the encoder encoding, in the response to the controller, the selectable group of data symbols into the transmission symbol and imparting the predetermined correlation thereupon, the controller being responsive to the data channel condition. 15. The communication device of claim 14 wherein the encoder is a convolutional encoder. 16. The communication device of claim 8, wherein the preselected coding method is constellation-multiplexed coding. 17. The communication device of claim 8, wherein the communication device is a receiver, the transmission symbol is representable by a plurality of symbol constellations, the data transformer detects the predetermined correlation between the successive ones of the plurality of transmission symbols and extracts the selectable predetermined integer number of data bits thereby, the predetermined data bit rate is at least one of a non-power of two and a non-integer, and the preselected coding method is constellation-multiplexed coding. 18. The communication device of claim 17, wherein a received signal includes a transmission symbol and channel noise imposed thereupon, and the data transformer further comprises: a. a noise estimator, operably connected with the data channel and governed by the controller, estimating a noise metric associated with the transmission symbol; and b. a sequence estimator, operably connected with the noise estimator and governed by the controller, detecting the predetermined correlation between the transmission symbols and the selectable predetermined integer number of data bits, and using the noise metric to filter the channel noise from the received signal, extracting the transmission symbol thereby . 19. The communication device of claim 18, wherein the sequence estimator comprises a maximum likelihood sequence estimator. 20. The communication device of claim 19, wherein the maximum likelihood sequence estimator comprises a Viterbi decoder. 21. The communication device of claim 19, wherein the data transformer further comprises a constellation demapper for demapping the transmission symbols into the selected number of data bits, the demapper being operably connected with the maximum likelihood sequence estimator and governed by the controller. 22. The communication device of claim 18 wherein the sequence estimator employs soft-decision decoding to detect the predetermined correlation. 23. The communication device of claim 22, wherein the received signal has a trellis encoding superimposed thereupon, and the soft-decision decoding includes finding a path through the trellis encoding with a minimum-weighted-squared-Euclidean distance to the transmission symbol from the received signal. 24. The communication device of claim 17, wherein the received signal is a modulated received signal, and wherein the data transformer further comprises a demodulator operably connected with the data channel, the noise estimator, and the sequence estimator, and governed by the controller, the demodulator restoring at least a portion of the transmission symbols from the modulated received signal. 25. The communication device of claim 24, wherein the demodulator further performing a correlative-level decoding. 26. The communication device of claim 25, wherein the correlative-level decoding includes a partial-response decoding. 27. The communication device of claim 5, wherein the preselected coding method is constellation-multiplexed coding. 28. The communication device of claim 5 wherein the data transformer dynamically selects successive ones of the plurality of data symbols in the response to the controller, the controller being responsive to the channel condition. 29. The communication device of claim 5 wherein the data transformer continuously selects successive ones of the plurality of data symbols in the response to the controller, the controller being responsive to the channel condition. 30. The communication device of claim 5 wherein the data transformer selects successive ones of the plurality of data symbols in the response to the data channel condition, according to a preselected coding method. 31. The communication device of claim 30, wherein the communication device is a receiver, the transmission symbol is representable by a plurality of symbol constellations, the data transformer detects the successive ones of the plurality of data symbols and extracts the selectable predetermined integer number of data bits thereby, the predetermined data bit rate is at least one of a power-of-two, a non-power of two, and a non-integer, and the preselected coding method is constellation-multiplexed coding. 32. The communication device of claim 31, wherein a received signal includes a transmission symbol and channel noise imposed thereupon, and the data transformer further comprises: a. a noise estimator, operably connected with the data channel and governed by the controller, for estimating a noise metric associated with the transmission symbol; and b. a sequence estimator, operably connected with the noise estimator and governed by the controller, detecting the received symbols, and the selectable predetermined integer number of data bits thereby, and using the noise metric to filter the channel noise from the received signal, extracting the transmission symbol thereby. 33. The communication device of claim 32 wherein the sequence estimator employs soft-decision decoding. 34. The communication device of claim 33, wherein the demodulator further performing a correlative-level decoding. 35. The communication device of claim 34, wherein the correlative-level decoding includes a partial-response decoding. 36. The communication device of cl
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