Digitally watermarking paper and objects with stamps and related digitally watermarked stamper
First Claim
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1. A method comprising the steps of:
- providing a digital watermark signal;
thresholding the digital watermark signal to yield a set of points, wherein the set of points is machine-readable;
embedding the thresholded digital watermark signal in a 1-bit per pixel pattern; and
patterning a stamper stamp surface after the embedded digital watermarked 1-bit per pixel pattern.
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Abstract
The present invention provides steganographic embedding techniques. In particular, the present invention provides a stamper (e.g., a rubber stamp) that includes a steganographic signal (e.g., a digital watermark) embedded in a stamping surface pattern thereof. The digital watermark survives in its host pattern when the stamper stamps the host pattern. The digital watermark can be used to authenticate or identify the stamper. The digital watermark can also be used to link to related information.
29 Citations
20 Claims
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1. A method comprising the steps of:
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providing a digital watermark signal;
thresholding the digital watermark signal to yield a set of points, wherein the set of points is machine-readable;
embedding the thresholded digital watermark signal in a 1-bit per pixel pattern; and
patterning a stamper stamp surface after the embedded digital watermarked 1-bit per pixel pattern. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of manufacturing a stamper comprising the steps of:
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receiving a digitally watermarked image;
using the digitally watermarked image as a template for patterning a surface which is to be used as a stamper stamp surface, the result of the patterning corresponding to the digitally watermarked image; and
providing the patterned surface as a stamper stamp surface. - View Dependent Claims (8, 9)
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10. A method of uniquely identifying a stamper comprising the steps of:
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providing a digital watermark having a payload, the payload including identifying data;
embedding the digital watermark in a pattern or image; and
shaping a stamper surface pattern in accordance with the digitally watermarked pattern or image, wherein a stamp produced by the stamper produces the pattern or image including the digital watermark. - View Dependent Claims (11, 12, 13, 14)
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- 15. A stamper comprising a handle and a surface, wherein the surface comprises a surface pattern formed by at least one of etching, molding and engraving, the surface pattern being patterned after a first pattern, wherein the first pattern includes a steganographic signal embedded therein, the surface pattern including the embedded steganographic signal, and wherein the embedded steganographic signal is generally visually imperceptible but remains machine-readable.
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19. A rubber stamp-making process including:
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defining a two-dimensional signal that encodes plural bits of data; and
shaping a rubber stamp pattern in accordance with said signal. - View Dependent Claims (20)
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Specification