Patent EP0766468A2 successfully refreshed from Google Patents.
EP0766468A2
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EP
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Method and system for inserting a spread spectrum watermark into multimedia data
Assignee: NEC Corp
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Filing: 1996-09-06
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Granted: —
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Expires: 2016-09-06
Abstract
Abstract Digital watermarking of audio, image, video or multimedia data is achieved by inserting the watermark into the perceptually significant components of a decomposition of the data in a manner so as to be visually imperceptible. In a preferred method, a frequency spectral image of the data, preferably a Fourier transform of the data, is obtained. A watermark is inserted into perceptually significant components of the frequency spectral image. The resultant watermarked spectral image is subjected to an inverse transform to produce watermarked data. The watermark is extracted from watermarked data by first comparing the watermarked data with the original data to obtain an extracted watermark. Then, the original watermark, original data and the extracted watermark are compared to generate a watermark which is analyzed for authenticity of the watermark.
Inventors
- 👤 Ingemar J. Cox
- 👤 Joseph J. Kilian
- 👤 Talal G. Shamoon
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:58
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/28; H04H20/30; H04H20/31; G; G06; G06T; G06T1/00; G06T1/0021; G06T1/0028; G06T1/005; H04N; H04N1/00; H04N1/32; H04N1/32101; H04N1/32144; H04N1/32149; H04N1/32154; H04N1/3216; H04N1/32165; H04N1/3217; H04N1/32187; H04N1/32197; H04N1/3232; H04N19/00; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2389; H04N21/23892; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; H04N7/00; H04N7/08; H04N7/24; H04N7/52; G06T2201/00; G06T2201/005; G06T2201/0052; G06T2201/0063; G06T2201/0065; G06T2201/0202; G11; G11B; G11B20/00; G11B20/00086; G11B20/00884; G11B20/00891; G11B20/00913; H04N19/30; H04N19/39; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3269; H04N2201/327
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
50 words
A method of inserting a watermark into data comprising the steps of: obtaining a decomposition of data to be watermarked; inserting a watermark into the perceptually significant components of the decomposition of data; and applying an inverse transform to the decomposition of data with the watermark for generating watermarked data.
Claim 2
Dependent Claim
27 words
A method of inserting a watermark into data as set forth in claim 1, said obtaining a decomposition of data being obtaining a spectral decomposition of data.
Claim 3
Dependent Claim
23 words
A method as set forth in claim 1 or 2, where said data comprising image data, video data, audio data and/or multimedia data.
Claim 4
Dependent Claim
37 words
A method as set forth in claim 2 or 3, where said obtaining a spectral decomposition of data is selected from the group consisting of Fourier transformation, discrete cosine transformation, Hadamard transformation, and wavelet, multi-resolution, sub-band method.
Claim 5
Independent Claim
39 words
A method as set forth in any one of claims 1 to 4, where said inserting a watermark inserts watermark values so that addition of additional signal into a perceptually significant component affects the perceived quality of the data.
Claim 6
Independent Claim
50 words
A method as set forth in any one of claims 2 to 5, further comprising: comparing data with watermarked data for obtaining extracted data values; comparing extracted data values with watermark values and data for obtaining difference values; and analyzing difference values to determine the watermark in the watermarked data.
Claim 7
Dependent Claim
19 words
A method as set forth in claim 6, where the watermark values are chosen according to a normal distribution.
Claim 8
Independent Claim
53 words
A method of inserting a watermark into data comprising the steps of: extracting values of perceptually significant components of a spectral decomposition of data; combining watermark values with the extracted values to create adjusted values; and inserting the adjusted values into the data in place of the extracted values to produce watermarked data.
Claim 9
Dependent Claim
25 words
A method of inserting a watermark into data as set forth in claim 8, where the watermark values are chosen according to a random distribution.
Claim 10
Independent Claim
20 words
The method as set forth in any one of claims 6 to 9, where watermark values include associated scaling parameters.
Claim 11
Dependent Claim
26 words
A method as set forth in claim 10, where scaling parameters are selected such that adding additional watermark value affects the perceived quality of the data.
Claim 12
Independent Claim
50 words
A method as set forth in any one of claims 8 to 11, further comprising: comparing data with watermarked data for obtaining extracted data values; comparing extracted data values with watermarked values and data for obtaining difference values; and analyzing difference values to determine the watermark in the watermarked data.
Claim 13
Dependent Claim
29 words
A method of inserting a watermark into data as set forth in claim 12, further comprising the step of preprocessing distorted or tampered watermarked data before said comparing data.
Claim 14
Dependent Claim
41 words
A method of inserting a watermark into data as set forth in claim 13, where said distorted or tampered watermarked data is clipped data and said preprocessing comprises replacing missing portions of the data with corresponding portions from original unwatermarked data.
Claim 15
Independent Claim
78 words
A system for inserting a watermark into data comprising: providing image data; providing watermark image data; first transform lens for transforming image data passing therethrough into transformed image data; second transform lens for transforming watermark image data passing therethrough into transformed watermark image data; optical combiner for combining the transformed image data and the transformed watermark image data to form transformed watermarked data; and inverse transform lens for forming watermarked data by inverse transformation of transformed watermarked data.
Claim 16
Dependent Claim
39 words
A system for inserting a watermark into data as set forth in claim 15, where said first transform lens and said second transform lens are Fourier transform lenses and said inverse transform lens is an inverse Fourier transform lens.
Claim 17
Independent Claim
76 words
A method of inserting a watermark into data comprising the steps of: obtaining a decomposition of data to be watermarked; modifying the data to be watermarked by subjecting the data to distortion and/or tampering; obtaining a decomposition of the modified data; comparing the components of the decomposition of data to be watermarked with the components of the decomposition of the modified data; and inserting a watermark into the data to be watermarked based upon said comparing.
References Cited (Backward Citations)
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