초록 ▼

The presently claimed invention relates generally to data encoding and steganography. One combination recites a method of encoding data representing color imagery with an auxiliary signal. The method includes: providing a set of encoding values for a data sample; determining a color characteristic a

The presently claimed invention relates generally to data encoding and steganography. One combination recites a method of encoding data representing color imagery with an auxiliary signal. The method includes: providing a set of encoding values for a data sample; determining a color characteristic associated the data sample based on associated color values; and selectively scaling color values in the data sample based on the color characteristic to encode at least a portion of the auxiliary signal in the data representing color imagery. Of course, other combinations are provided as well.

대표청구항 ▼

We claim: 1. A method to encode an image with a digital watermark, wherein the image comprises a plurality of color channels, said method comprising: determining a color characteristic for a group of image samples; based at least in part on the characteristic, determining for the group of image sam

We claim: 1. A method to encode an image with a digital watermark, wherein the image comprises a plurality of color channels, said method comprising: determining a color characteristic for a group of image samples; based at least in part on the characteristic, determining for the group of image samples which of the plurality of color channels should receiving encoding; transforming from the group of image samples at least one determined color channel that should receive encoding into a transform domain; and altering transform domain coefficients of the at least one determined color channel to encode the digital watermark. 2. The method of claim 1, further comprising transforming an altered color channel into a spatial domain. 3. The method of claim 1, where the characteristic identifies which of the color channels will best hide the digital watermark in terms of visibility. 4. A method of encoding a color image with an auxiliary signal, wherein the auxiliary signal comprises encoding values, and wherein the color image comprises an array of color values, said method comprising: providing a set of encoding values for an image sample; determining a color characteristic for the image sample based on its color values; and selectively scaling color values in the image sample based on the color characteristic to encode at least a portion of the auxiliary signal in the color image in accordance with at least the encoding values. 5. The method of claim 4, wherein the scaling effects a change in luminance. 6. The method of claim 5, wherein the scaling comprises a scale to black. 7. The method of claim 5, wherein the scaling comprises a scale to white. 8. The method of claim 4, wherein the color characteristic comprises yellow content. 9. A method to encode data representing imagery with a digital watermark, wherein the data represents a plurality of colors, said method comprising: determining a color characteristic for a group of data samples; based at least in part on the characteristic, determining for the group of data samples which of the plurality of colors should receiving encoding; transforming from the group of data samples data representing at least one determined color that should receive encoding into a transform domain; and altering transform domain coefficients of the data representing at least one determined color to encode the digital watermark. 10. The method of claim 9 further comprising transforming data representing an altered color into a spatial domain. 11. The method of claim 9 where the characteristic identifies which of the colors will best hide the digital watermark in terms of visibility. 12. The method of claim 9 wherein the imagery comprises a digital image or video. 13. A method of encoding data representing color imagery with an auxiliary signal, said method comprising: providing a set of encoding values for a data sample; determining a color characteristic associated the data sample based on associated color values; and selectively scaling color values in the data sample based on the color characteristic to encode at least a portion of the auxiliary signal in the data representing color imagery. 14. The method of claim 13 wherein the selectively scaling effects a change in luminance. 15. The method of claim 14 wherein the selectively scaling comprises a scale to black. 16. The method of claim 14 wherein the selectively scaling comprises a scale to white. 17. The method of claim 13, wherein the color characteristic are associated with yellow content. 18. The method of claim 13 wherein the color imagery comprises a digital color image or video. 19. The method of claim 18 wherein the auxiliary data is steganographically encoded in the data representing color imagery.