초록 ▼

A variety of techniques for steganographically encoding digital data into, and decoding steganographically data from, audio, video, and image signals ("content signals") are disclosed. One method encodes a sampled input signal in a manner wherein a single signal sample is processed in accordance wit

A variety of techniques for steganographically encoding digital data into, and decoding steganographically data from, audio, video, and image signals ("content signals") are disclosed. One method encodes a sampled input signal in a manner wherein a single signal sample is processed in accordance with plural bits of binary data. Another technique globally distributes a plural-bit code throughout a content signal, so that the code can be fully discerned from an analysis of even a fraction of the encoded signal, and wherein the encoding takes the form of low level pseudo-random noise. Another technique involves decoding steganographic data from an encoded content signal without reference to an unencoded version of the content signal. A variety of other techniques are also disclosed.

대표청구항 ▼

A variety of techniques for steganographically encoding digital data into, and decoding steganographically data from, audio, video, and image signals ("content signals") are disclosed. One method encodes a sampled input signal in a manner wherein a single signal sample is processed in accordance wit

A variety of techniques for steganographically encoding digital data into, and decoding steganographically data from, audio, video, and image signals ("content signals") are disclosed. One method encodes a sampled input signal in a manner wherein a single signal sample is processed in accordance with plural bits of binary data. Another technique globally distributes a plural-bit code throughout a content signal, so that the code can be fully discerned from an analysis of even a fraction of the encoded signal, and wherein the encoding takes the form of low level pseudo-random noise. Another technique involves decoding steganographic data from an encoded content signal without reference to an unencoded version of the content signal. A variety of other techniques are also disclosed. is used as the control signal for expansion. ideo recording of the HDTV signal; wherein the act of modifying includes at least one of: a) level shifting the indication; b) level shifting at least a portion of the indication; c) increasing an amplitude of at least a portion of the indication; d) placing the indication in an above black level portion of the HDTV signal; e) placing the indication in an active video portion of the HDTV signal; and f) placing the indication in an audio channel associated with the HDTV signal. 13. The method of claim 12, wherein the act of modifying includes modifying the HDTV signal so that at least a portion of the HDTV signal carrying the indication is recordable. 14. The method of claim 12, wherein the act of modifying includes providing the indication in a recordable portion of the HDTV signal. 15. The method of claim 12, wherein the act of modifying includes: extracting the indication; coding the indication; and inserting the coded indication into a predetermined portion of the HDTV signal. 16. The method of claim 15, wherein the predetermined portion is one of active video or a blanking interval. 17. The method of claim 12, wherein the act of modifying includes: correcting time shifting between the active video and the timing reference in the video line, prior to the act of recording, thereby obviating the need to record the indication of the amount of time shifting. 18. The method of claim 17, further comprising correcting any time base error in the video line after the correcting of the time shifting. 19. A method of modifying a high definition television (HDTV) signal which has been subject to time shifting of the active video in a video line relative to a timing reference of the line, wherein an indication of the amount of time shifting is associated with the HDTV signal and not recordable by at least some video recorders, for inhibiting the making of acceptable recordings of the HDTV signal therefrom, the method comprising the acts of: receiving the HDTV signal including the associated indication of the amount of time shifting; modifying the HDTV signal so that the indication of the amount of time shifting is recordable; and recording the HDTV signal along with the indication of the amount of time shifting, thereby to permit later playback of a more acceptable video recording of the HDTV signal; wherein the act of modifying includes: extracting the indication from the HDTV signal; and conveying the extracted indication in a channel not carrying a remainder of the HDTV signal. 20. The method of claim 19, wherein the act of conveying includes modulating the indication onto an audio frequency carrier signal on an audio channel. 21. A method of modifying a high definition television (HDTV) signal which has been subject to time shifting of the active video in a video line relative to a timing reference of the line, wherein an indication of the amount of time shifting is associated with the HDTV signal and not recordable by at least some video recorders, for inhibiting the making of acceptable recordings of the HDTV signal therefrom, the method comprising the acts of: receiving the HDTV signal including the associated indication of the amount of time shifting; modifying the HDTV signal so that the indication of the amount of time shifting is recordable; and recording the HDTV signal along with the indication of the amount of time shifting, thereby to permit later playback of a more acceptable video recording of the HDTV signal; wherein the act of recording includes converting the HDTV signal to digital form, and wherein the act of modifying includes changing an amplitude of at least a portion of the HDTV signal carrying the indication, prior to the converting, to a level at which the indication can be converted to the digital form. 22. The method of claim 21, further comprising changing an amplitude of an active picture portion of the HDTV signal. 23. The method of claim 21, wherein the indicatio n is at an edge of a sync pulse in the HDTV signal, and the act of modifying includes changing an amplitude of at least the edge of the sync pulse. 24. A method of modifying a high definition television (HDTV) signal which has been subject to time shifting of the active video in a video line relative to a timing reference of the line, wherein an indication of the amount of time shifting is associated with the HDTV signal and not recordable by at least some video recorders, for inhibiting the making of acceptable recordings of the HDTV signal therefrom, the method comprising the acts of: receiving the HDTV signal including the associated indication of the amount of time shifting; modifying the HDTV signal so that the indication of the amount of time shifting is recordable; and recording the HDTV signal along with the indication of the amount of time shifting, thereby to permit later playback of a more acceptable video recording of the HDTV signal; wherein the act of recording includes converting the HDTV signal to digital form, and wherein the act of modifying includes moving a portion of the HDTV signal carrying the indication to a location in the HDTV signal, wherein the indication is a pulse train. 25. An apparatus for modifying a high definition television (HDTV) signal which has been subject to time shifting of the active video in a video line relative to a timing reference of the video line, wherein an indication of the amount of the time shifting is associated with the HDTV signal and not recordable by at least some video recorders, for inhibiting the making of acceptable recordings of the HDTV signal therefrom, the apparatus comprising: an input terminal for receiving the HDTV signal including the associated indication of the amount of time shifting; modifier circuitry coupled to the input terminal and processing the HDTV signal so the indication of the amount of time shifting is modified so as to be recordable; and an output terminal coupled to the modifier circuitry for outputting the modified HDTV signal to a video recorder; wherein the modifier circuitry does one of: a) level shifting the indication; b) level shifting at least a portion of the indication; c) increasing an amplitude of at least a portion of the indication; d) placing the indication in an above black level portion of the HDTV signal; e) placing the indication in an active video portion of the HDTV signal; f) placing the indication in an audio channel associated with the HDTV signal; and g) encoding the indication and placing the encoded indication in a blanking interval of the HDTV signal.