Patent US6628801B2 successfully refreshed from Google Patents.
US6628801B2
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US
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Image marking with pixel modification
Assignee: Digimarc Corp
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Filing: 1999-10-12
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Granted: 2003-09-30
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Expires: 2019-10-12
Abstract
Abstract A method and system for embedding signatures within visual images in both digital representation and print or film. A signature is inseparably embedded within the visible image, the signature persisting through image transforms that include resizing as well as conversion to print or film and back to digital form. Signature points are selected from among the pixels of an original image. The pixel values of the signature points and surrounding pixels are adjusted by an amount detectable by a digital scanner. The adjusted signature points form a digital signature which is stored for future identification of subject images derived from the image. In one embodiment, a signature is embedded within an image by locating relative extrema in the continuous space of pixel values and selecting the signature points from among the extrema. Preferably, the signature is redundantly embedded in the image such that any of the redundant representations can be used to identify the signature. Identification of a subject image includes ensuring that the subject image is normalized with respect to the original image or the signed image. Preferably, the normalized subject image is compared with the stored digital signature.
Inventors
- 👤 Robert D. Powell
- 👤 Mark J. Nitzberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:06
CPC Classifications
G; G06; G06T; G06T1/00; G06T1/0021; G06T1/005; G06T1/0064; G06Q; G06Q20/00; G06Q20/30; G06Q20/34; G06Q20/341; G06T1/0028; G07; G07D; G07D7/00; G07D7/004; G07D7/0047; G07D7/005; G07D7/0054; G07D7/0056; G07D7/06; G07D7/12; G07D7/20; G07D7/2008; G07D7/202; G07D7/2033; G07F; G07F7/00; G07F7/08; G07F7/12; H; H04; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32203; H04N1/32208; H04N1/32229; H04N1/32245; H04N1/32251; H04N1/32288; H04N1/3232; G06T2201/00; G06T2201/005; G06T2201/0051; G06T2201/0081; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3235; H04N2201/3269; H04N2201/327
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
50 words
A method of placing a watermark on a digital image, comprising the steps of: providing a digital original image; providing a digital watermark image; and, producing a watermarked image by superimposing the watermark image on the original image without changing the chromaticities of pixels of the original image as watermarked.
Claim 2
Independent Claim
50 words
A method of placing a watermark on a digital image, comprising the steps of: providing a digital original image; providing a digital watermark image; and, producing a watermarked image by superimposing the watermark image on the original image without changing the chromaticities of pixels of the original image as watermarked.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein the step of producing comprises the step of: for a selected number of points, modifying the corresponding pixel of the original image by changing the brightness but not the color.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein the step of producing comprises the step of: for a selected number of relative extrema, modifying the corresponding pixel of the original image by changing the brightness but not the color.
Claim 5
Independent Claim
50 words
A method of applying an imperceptible digital watermark to an original image comprising the step of applying the watermark to the original image as a percentage correction on pixel sample values of the original image in a linear color space such that the chromaticities of the pixels are not changed.
Claim 6
Independent Claim
50 words
A method of applying an imperceptible digital watermark to an original image comprising the step of applying the watermark to the original image as a percentage correction on pixel sample values of the original image in a linear color space such that the chromaticities of the pixels are not changed.
Claim 7
Independent Claim
50 words
A system for placing a watermark on a digital image, comprising: a storage device having a digital original image and a digital watermark stored therein; and, means for producing a watermarked image by superimposing the watermark on the original image without changing the chromaticities of the original image as watermarked.
Claim 8
Independent Claim
50 words
A system for placing a watermark on a digital image, comprising: a storage device having a digital original image and a digital watermark stored therein; and, means for producing a watermarked image by superimposing the watermark on the original image without changing the chromaticities of the original image as watermarked.
Claim 9
Dependent Claim
34 words
The system of claim 5 wherein the means for producing comprises: means for modifying each selected pixel of the original image corresponding to a selected point, by changing the brightness but not the color.
Claim 10
Dependent Claim
34 words
The system of claim 5 wherein the means for producing comprises: means for modifying each selected pixel of the original image corresponding to a relative extrema, by changing the brightness but not the color.
Claim 11
Independent Claim
93 words
A system for applying an imperceptible digital watermark to an original digital image, comprising: means for identifying a subset of pixels of the original image that will be modified as a result of applying the watermark; a programmed processor operable to determine a modification corresponding to a percentage adjustment based on the values of the color components for each of the pixels in the subset, means for multiplying each of the color components of each of the pixels in the subset by its percentage adjustment, and means for storing a resulting watermarked image.
Claim 12
Independent Claim
93 words
A system for applying an imperceptible digital watermark to an original digital image, comprising: means for identifying a subset of pixels of the original image that will be modified as a result of applying the watermark; a programmed processor operable to determine a modification corresponding to a percentage adjustment based on the values of the color components for each of the pixels in the subset, means for multiplying each of the color components of each of the pixels in the subset by its percentage adjustment, and means for storing a resulting watermarked image.
Claim 13
Independent Claim
69 words
A method for applying an imperceptible digital watermark to an original digital image, comprising the steps of: identifying a subset of pixels of the original image to be modified; for each pixel in said subset of pixels, determining a percentage value based on the values of the color components of said pixel; and, multiplying each component of said pixel by said percentage value, and, storing a resulting watermarked image.
Claim 14
Independent Claim
69 words
A method for applying an imperceptible digital watermark to an original digital image, comprising the steps of: identifying a subset of pixels of the original image to be modified; for each pixel in said subset of pixels, determining a percentage value based on the values of the color components of said pixel; and, multiplying each component of said pixel by said percentage value, and, storing a resulting watermarked image.
Claim 15
Independent Claim
69 words
A method for applying an imperceptible digital watermark to an original digital image, comprising the steps of: identifying a subset of pixels of the original image to be modified; for each pixel in said subset of pixels, determining a percentage value based on the values of the color components of said pixel; and, modifying each component of said pixel by said percentage value, and, storing a resulting watermarked image.
Claim 16
Independent Claim
69 words
A method for applying an imperceptible digital watermark to an original digital image, comprising the steps of: identifying a subset of pixels of the original image to be modified; for each pixel in said subset of pixels, determining a percentage value based on the values of the color components of said pixel; and, modifying each component of said pixel by said percentage value, and, storing a resulting watermarked image.
References Cited (Backward Citations)
US2630525A
Cited
US3576369A
Cited
US3493674A
Cited
US3562420A
Cited
US3585290A
Cited
US4231113A
Cited
US3569619A
Cited
US3845391A
Cited
US3638188A
Cited
US3655162A
Cited
US4944036A
Cited
US3703628A
Cited
US3971917A
Cited
US3805238A
Cited
US3922074A
Cited
US3809806A
Cited
US3838444A
Cited
US3982064A
Cited
US3914877A
Cited
US3984624A
Cited
US3977785A
Cited
DE2643436A1
Cited
US4184700A
Cited
US4025851A
Cited
US4252995A
Cited
US4310180A
Cited
US4238849A
Cited
US4225967A
Cited
US4262329A
Cited
US4379947A
Cited
US4230990A
Cited
US4230990C1
Cited
US4237484A
Cited
GB2063018A
Cited
GB2067871A
Cited
US4313197A
Cited
US4423415A
Cited
US4528588A
Cited
US4595950A
Cited
US4389671A
Cited
US4395600A
Cited
US4416001A
Cited
US4380027A
Cited
US4367488A
Cited
US4476468A
Cited
US4425661A
Cited
US4425642A
Cited
US4488245A
Cited
US4665431A
Cited
US4495620A
Cited
US4644582A
Cited
US4639779A
Cited
US4805020A
Cited
US4967273A
Cited
US4547804A
Cited
US4532508A
Cited
US4908873A
Cited
US4553261A
Cited
US4590366A
Cited
US4660221A
Cited
US4637051A
Cited
US4675746A
Cited
US4703476A
Cited
US4835517A
Cited
US5166676A
Cited
US4672605A
Cited
US4697209A
Cited
US4654867A
Cited
US4677435A
Cited
US4663518A
Cited
US4921278A
Cited
US4647974A
Cited
US4750173A
Cited
US4682794A
Cited
US4677466A
Cited
US4820912A
Cited
US4765656A
Cited
US4712103A
Cited
US4775901A
Cited
US5719984A
Cited
US4776013A
Cited
US4825393A
Cited
US4876617A
Cited
US4718106A
Cited
US5067162A
Cited
GB2196167A
Cited
US4739377A
Cited
US5410598A
Cited
US5293399A
Cited
US4864618A
Cited
US4884139A
Cited
US4866771A
Cited
US4972475A
Cited
US4903301A
Cited
GB2204984A
Cited
US4941150A
Cited
US4965827A
Cited
US5073925A
Cited
US4979210A
Cited
US4855827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-09-29 | 2007-03-31 | 2007-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-09-29 | 2011-03-31 | 2011-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-09-29 | 2015-03-31 | 2015-09-30 | $7700.00 | Window Closed / Lapsed |