Digital watermarking methods, apparatus and systems
The present invention relate generally to digital watermarking and data hiding. One claim recites an apparatus comprising: electronic memory for storing first color data and second color data, the first color data and the second color data represent data from a color image signal or color video signal, and a digital watermark signal, the digital watermark signal serving to facilitate detection of a watermark message; means for separating the digital watermark signal into first frequency components and second frequency components; means for modifying the first color data by hiding the first frequency components therein; and means for modifying the second color data by hiding the second frequency components therein. Of course, other combinations and claims are provided too.
1. An apparatus comprising:
memory for storing first color data and second color data, the first color data and the second color data represent data from a color image signal or color video signal;
means for obtaining a digital watermark pattern, the digital watermark pattern aiding detection of a watermark message;
means for separating the digital watermark pattern into first frequency components and second frequency components;
means for i) modifying the first color data by hiding the first frequency components therein; and ii) modifying the second color data by hiding the second frequency components therein.
2. The apparatus of claim 1 further comprising means for obtaining the watermark message and steganographically embedding the watermark message in a luminance channel of the color image signal or color video signal.
3. The apparatus of claim 1 in which the first frequency components comprise higher frequency components relative to the second frequency components.
4. The apparatus of claim 3 in which the first color data comprises red-green color data, and the second color data comprises blue-yellow color data.
5. The apparatus of claim 4 further comprising means for obtaining the watermark message and embedding the watermark message in a luminance channel of the color image signal or color video signal.
6. An apparatus comprising:
memory for storing first color data, second color data and third data, the first color data, the second color data and third data each represent components of a color image signal or color video signal;
means for obtaining a digital watermark signal, the digital watermark signal serving to facilitate detection of a watermark message;
means for separating the digital watermark signal into first frequency components, second frequency components and third frequency components;
means for i) modifying the first color data by hiding the first frequency components therein; and ii) modifying the second color data by hiding the second frequency components therein; and iii) modifying the third data by hiding the third frequency components therein.
7. The apparatus of claim 6 in which the third frequency components comprise higher frequency components relative to the second frequency components and to the first frequency components, and the second frequency components comprise higher frequency components relative to the first frequency components.
8. The apparatus of claim 7 in which the second color data comprises red-green color data, and the first color data comprises blue-yellow color data.
9. An apparatus comprising:
electronic memory for storing first color data and second color data, the first color data and the second color data represent data from a color image signal or color video signal, and a digital watermark signal, the digital watermark signal serving to facilitate detection of a watermark message;
means for separating the digital watermark signal into first frequency components and second frequency components;
means for modifying the first color data by hiding the first frequency components therein; and
means for modifying the second color data by hiding the second frequency components therein.
10. The apparatus of claim 9 further comprising means for obtaining the watermark message and means for hiding the watermark message in luminance data of the color image signal or color video signal.
11. The apparatus of claim 9 in which the first frequency components comprise higher frequency components relative to the second frequency components.
12. The apparatus of claim 9 in which the first color data comprises red-green color data, and the second color data comprises blue-yellow color data.