Patent•
Method for inserting, in the fourier domain, a digital watermark in an image and corresponding method for detecting a digital watermark in an image to be analyzed
12 Feb 2013-
TL;DR: In this article, a method for inserting a digital watermark in an image by an insertion device is described, where the watermark includes a set of watermarking coefficients each associated with a distinct determined position of a given quadrant among the quadrants of the Fourier domain.
Abstract: A method is provided for inserting a digital watermark in an image by an insertion device. Inserting includes: applying a Fourier transform to the image, delivering a 2D Fourier spectrum; inserting the watermark in the Fourier spectrum delivering a modified Fourier spectrum; and applying an inverse Fourier transform to the modified Fourier spectrum delivering a watermarked image. The watermark includes a set of watermarking coefficients each associated with a distinct determined position of a given quadrant among the quadrants of the Fourier domain, the spectral coordinates u and v of which, measured along the two axes of coordinates of the given quadrant and starting from the continuous component and expressed in percentage of the dimensions U and V of the given quadrant, are such that: u>66%×U and v>66%×V. The set of positions associated with the watermarking coefficients defines a convex pattern in the given quadrant.
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Patent•
22 Feb 2017
TL;DR: In this article, a watermark adding and extraction method in a digital image was proposed, which consisted of the steps that a target carrier image and watermark image to be added are acquired; the target carrier images is coded; frequency domain transformation and first quantitative coding processing are performed on the obtained first color coded carrier image; singular value decomposition is performed on watermark images; the obtained U-matrix and the V-Matrix are embedded in the coded first low frequency band signals; and a second color coded image obtaining the watermark is obtained according to the result of two
Abstract: The invention provides a watermark adding and extraction method in a digital image. The watermark adding method in the digital image comprises the steps that a target carrier image and a watermark image to be added are acquired; the target carrier image is coded; frequency domain transformation and first quantitative coding processing are performed on the obtained first color coded carrier image; singular value decomposition is performed on the watermark image, and the obtained first diagonal matrix is embedded the coded first high frequency band signals; the obtained U-matrix and the V-matrix are embedded in the coded first low frequency band signals; and a second color coded carrier image obtaining the watermark image is obtained according to the result of two times of embedding. Complete watermark information can still be extracted out of the a second color coded carrier image containing the watermark after printing and scanning, and the second color coded carrier image containing the watermark can be decoded and character information can be acquired so that the objectives of copyright protection and counterfeiting prevention through combination of the color two-dimensional codes and the digital watermark can be achieved.
14 citations
References
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TL;DR: It is argued that insertion of a watermark under this regime makes the watermark robust to signal processing operations and common geometric transformations provided that the original image is available and that it can be successfully registered against the transformed watermarked image.
Abstract: This paper presents a secure (tamper-resistant) algorithm for watermarking images, and a methodology for digital watermarking that may be generalized to audio, video, and multimedia data. We advocate that a watermark should be constructed as an independent and identically distributed (i.i.d.) Gaussian random vector that is imperceptibly inserted in a spread-spectrum-like fashion into the perceptually most significant spectral components of the data. We argue that insertion of a watermark under this regime makes the watermark robust to signal processing operations (such as lossy compression, filtering, digital-analog and analog-digital conversion, requantization, etc.), and common geometric transformations (such as cropping, scaling, translation, and rotation) provided that the original image is available and that it can be successfully registered against the transformed watermarked image. In these cases, the watermark detector unambiguously identifies the owner. Further, the use of Gaussian noise, ensures strong resilience to multiple-document, or collusional, attacks. Experimental results are provided to support these claims, along with an exposition of pending open problems.
6,194 citations
01 Jan 1995
TL;DR: A method using a JPEG model based, frequency hopped, randomly sequenced pulse position modulated code (RSPPMC) is described, which supports robustness of embedded labels against several damaging possibilities such as lossy data compression, low pass filtering and/or color space conversion.
Abstract: This paper first presents a "hidden label" approach for identifying the ownership and distribution of multimedia information (image or video data) in digital networked environment. Then it discusses criteria and difficulties in implementing the approach. Finally a method using a JPEG model based, frequency hopped, randomly sequenced pulse position modulated code (RSPPMC) is described. This method supports robustness of embedded labels against several damaging possibilities such as lossy data compression, low pass filtering and/or color space conversion.
528 citations
15 Mar 1999
TL;DR: An algorithm for rotation and scale invariant watermarking of digital images that is robust to compression, filtering, cropping, translation and rotation and does not require the original image.
Abstract: This paper presents an algorithm for rotation and scale invariant watermarking of digital images. An invisible mark is embedded in magnitude of the DFT domain. It is robust to compression, filtering, cropping, translation and rotation. The watermark introduces image changes that are invisible to the human eye. The detection algorithm does not require the original image.
146 citations
Patent•
09 Mar 2004
TL;DR: In this article, the registration data embedded in an image is used to determine and compensate for geometric transformation of the image, which is used in conjunction with digital watermarking and other signal processing applications.
Abstract: Registration data embedded in an image is used to determine and compensate for geometric transformation of the image. The registration data may include frequency domain features of the image that are used to compute the rotation and/or scaling of the image. The registration method may be used in conjunction with digital watermarking and other signal processing applications.
91 citations
Patent•
04 Oct 2000TL;DR: In this article, the coded information is embedded into high frequency coefficients in a transform representation of the image, which can then be deciphered and compared to the signature determined directly from the image to authenticate the integrity of the signal.
Abstract: An image authentication system utilizes a coded version of a digital image signature and embeds that information into a transform representation of the image. A digital image signature preferably is extracted from the image data. That signature is coded so that the signature is not immediately recognizable. The coded information is embedded into high frequency coefficients in a transform representation of the image. The contents of the high frequency coefficients of a received or later accessed signal can then be deciphered and compared to the signature determined directly from the image to authenticate the integrity of the signal.
13 citations