Low visibility watermarks using an out-of-phase color
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G06K-009/00
출원번호
US-0898901
(2001-07-02)
발명자
/ 주소
Reed, Alastair M.
Bradley, Brett A.
출원인 / 주소
Digimarc Corporation
대리인 / 주소
Stewart, Steven W.Digimarc Corporation
인용정보
피인용 횟수 :
146인용 특허 :
383
초록▼
The present invention relates to digital watermarks. In a preferred embodiment, a media signal is embedded with a digital watermark component. The media signal includes a cyan color plane, a magenta color plane, a yellow color plane, and a black plane. The digital watermark component is embedded in
The present invention relates to digital watermarks. In a preferred embodiment, a media signal is embedded with a digital watermark component. The media signal includes a cyan color plane, a magenta color plane, a yellow color plane, and a black plane. The digital watermark component is embedded in the cyan, magenta, and yellow color planes. The digital watermark component is inverted, and embedded in the black color plane. The resulting watermark is fragile, since signal processing techniques that combine the color planes with the black color plane effectively cancels the watermark signal in local areas. The inventive watermark also includes low-visibility properties, by canceling perceived luminance change in local areas throughout the media signal. In another embodiment, a watermark signal is embedded in a first color scheme to be out-of-color gamut in a second color scheme.
대표청구항▼
The present invention relates to digital watermarks. In a preferred embodiment, a media signal is embedded with a digital watermark component. The media signal includes a cyan color plane, a magenta color plane, a yellow color plane, and a black plane. The digital watermark component is embedded in
The present invention relates to digital watermarks. In a preferred embodiment, a media signal is embedded with a digital watermark component. The media signal includes a cyan color plane, a magenta color plane, a yellow color plane, and a black plane. The digital watermark component is embedded in the cyan, magenta, and yellow color planes. The digital watermark component is inverted, and embedded in the black color plane. The resulting watermark is fragile, since signal processing techniques that combine the color planes with the black color plane effectively cancels the watermark signal in local areas. The inventive watermark also includes low-visibility properties, by canceling perceived luminance change in local areas throughout the media signal. In another embodiment, a watermark signal is embedded in a first color scheme to be out-of-color gamut in a second color scheme. er; comparing said third digital data to said second digital data and determining whether said actual response curve is within said tolerance range; and if said actual response curve is not within said tolerance range, iteratively generating digital audio filters by iteratively generating coefficients for digital audio filters, applying digital audio filters determined by said coefficients to said second digital data to generate fourth digital data for a compensated response curve, and automatically optimizing said coefficients until said compensated response curve is within said tolerance range or a predetermined limit on the number of digital audio filters has been reached, whichever occurs first. 12. An apparatus according to claim 11, wherein said digital computer is programmed to determine said coefficients by automatically optimizing said coefficients by optimizing the frequency, amplitude and bandwidth of said digital audio filters. 13. A method for generating digital filters for equalizing a loudspeaker, comprising the steps of: providing first digital data for a tolerance range for a target response curve of sound level versus frequency for said loudspeaker; providing second digital data for a first actual response curve of sound level versus frequency for said loudspeaker; comparing said first digital data to said second digital data and determining whether said first actual response curve is within said tolerance range; and if said first actual response curve is not within said tolerance range, iteratively generating digital audio filters to compensate said actual response curve, applying said digital audio filters to said first digital data to gener
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