| 6678378 |
3-dimensional shape data encryption and decryption |
| Jan-13-2004 |
Encryption and decryption methods for 3-dimensional shape data, especially copyrighted data, useful for detecting unauthorized use or piracy of a 3-dimensional object's shape represented by the 3-dimensional... |
| 6665420 |
Message authentication code with improved error tolerance |
| Dec-16-2003 |
A method of generating a authentication code ("MAC") with improved error tolerance exhibits improved survivability against acceptable signal distortions such as recompression. A method of generating a... |
| 6665406 |
Variable density verification |
| Dec-16-2003 |
A counterfeit-resistant document comprises a contrasting layer and a dynamic camouflaging layer. The contrasting layer is highly contrastive and includes a latent message that can be reproduced over a... |
| 6650428 |
Automated duplex image generation for a duplexing image forming device |
| Nov-18-2003 |
A method and apparatus using a duplex printer to print indicia on the back side of a printed page to provide privacy for confidential information appearing on the front side and/or indicia to indicate... |
| 6633654 |
Perceptual modeling of media signals based on local contrast and directional edges |
| Oct-14-2003 |
A perceptual model performs an analysis of a media signal, such as an image or audio signal. The model may be used in media signal processing applications such as digital watermarking and data compression... |
| 6633652 |
Method of inserting a watermark and authenticating a digital signal |
| Oct-14-2003 |
A method of inserting an additional information item for authenticating a digital signal decomposed into a set of coefficients (X.sub.ij), each coefficient being represented in 16 bits, and the additional... |
| 6628801 |
Image marking with pixel modification |
| Sep-30-2003 |
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... |
| 6628802 |
Marking and determining distortion in an image |
| Sep-30-2003 |
The present invention provides methods and apparatus that reverse the notion of the attack process in using intentional image distortion techniques as a means of indelibly marking an original image. It... |
| 6611598 |
Self-authentication of value documents using encoded indices |
| Aug-26-2003 |
A method and system as presented by which valuable documents such as checks, deeds, driver's licenses, and other types of valuable documents can be imprinted with encoded symbols by a printer whereupon... |
| 6611599 |
Watermarking of digital object |
| Aug-26-2003 |
A technique for identifying digital object using a digital watermark. The technique includes the steps of encrypting a message derived from source data on the digital object, to obtain an encrypted message... |
| 6591365 |
Copy protection control system |
| Jul-8-2003 |
A system for protecting against use of pirated music. Two watermarks are inserted into the music to be protected by the music publisher. One watermark is robust--it will not be destroyed by compression.... |
| 6587948 |
Recording apparatus, recording medium, playback apparatus, recording method and playback method |
| Jul-1-2003 |
A recording method and a recording apparatus whereby digital data is recorded onto a disc as run-length limited code used for modulating marks or spaces on the disc and, at the same time, the recorded... |
| 6571336 |
Method and apparatus for securing a list of passwords and personal identification numbers |
| May-27-2003 |
A method for securing passwords, personal identification numbers and identifying patterns utilizes a MasterCode camouflaged within a grid which contains all the characters, symbols or pictograms of which... |
| 6570708 |
Image processing apparatus and method with locking feature |
| May-27-2003 |
An optical coherent processor or correlator for processing an input image produced by an imaging device illuminated by a coherent light source utilizes an optical key for preventing unauthorized use of... |
| 6553127 |
Method and apparatus for selective block processing |
| Apr-22-2003 |
Methods, devices and systems for embedding and detecting a watermark in a data stream, such as a video stream. A texture criterion is evaluated for each block of the data stream. The texture criterion... |
| 6542927 |
Linking of computers based on steganographically embedded digital data |
| Apr-1-2003 |
A printed object, such as an item of postal mail, a book, printed advertising, a business card, product packaging, etc., is steganographically encoded with plural-bit data. When such an object is presented... |
| 6530023 |
Method and device that validates time of an internal source using an external source |
| Mar-4-2003 |
Digital data is provided with a time stamp of an internal time signal of an internal clock. The internal time signal is validated by receiving and evaluating an internal broadcast or a cable signal of... |
| 6523114 |
Method and apparatus for embedding authentication information within digital data |
| Feb-18-2003 |
Arbitrary digital information is embedded within a stream of digital data, in a way that avoids detection by a casual observer and that allows a user to determine whether the digital data have been modified... |
| 6522770 |
Management of documents and other objects using optical devices |
| Feb-18-2003 |
By printing documents and other objects with machine readable indicia, such as steganographic digital watermarks or barcodes, a great variety of document management functions can be enabled. The indicia... |
| 6522749 |
Quantum cryptographic communication channel based on quantum coherence |
| Feb-18-2003 |
A quantum cryptographic communication channel having: a light source; a reflector; first and second sources each capable of generating a pair of photons emitted in the form of signal and idler light beams... |
| 6519341 |
Method and apparatus for outputting a high definition image |
| Feb-11-2003 |
An image processing apparatus separates input image data into low resolution image data and one or more auxiliary image data for interpolating the low resolution image data, and decrypts at least one of... |
| 6490355 |
Method and apparatus for use of a time-dependent watermark for the purpose of copy protection |
| Dec-3-2002 |
A copy protection system for protecting content wherein a ticket and a watermark are created, utilizing a first time reference (TD) and a one-way function, to indicate the copy protection status of the... |
| 6477431 |
Watermark detection |
| Nov-5-2002 |
A method and arrangement for detecting a watermark in an information signal. The method may include the steps of computing the correlation (d.sub.k) of the watermark (W.sub.i) and the information signal... |
| 6456985 |
Image encrypting method and device, image decrypting method and device, and recording medium |
| Sep-24-2002 |
When image data has been decomposed into a plurality of components, and a plurality of components of the components have been encrypted, the encrypted image file must be able to be used without confusion.... |
| 6456724 |
Electronic watermarking system capable of providing image data with high secrecy |
| Sep-24-2002 |
In an electronic watermarking device for inserting an electronic watermark into an original image, discrete cosine transformer carries out discrete cosine transform of a partial block of the original image,... |
| 6438231 |
Emulsion film media employing steganography |
| Aug-20-2002 |
Technology is now available permitting consumers to make amateur- or even professional-grade copies of photographs. For wedding and portrait photographers, in particular, the business of making duplications... |
| 6404926 |
Apparatus and method of processing image data, transmission medium, and recording medium |
| Jun-11-2002 |
The present invention relates to an apparatus and a method of processing an image data, a transmission medium, as well as a recording medium. In detail, in an image data processing of processing an image... |
| 6396927 |
Variable density verification |
| May-28-2002 |
A counterfeit-resistant document comprises a contrasting layer and a dynamic camouflaging layer. The contrasting layer is highly contrastive and includes a latent message that can be reproduced over a... |
| 6367015 |
User authentication using member with either holes or projections |
| Apr-2-2002 |
In an authentication apparatus, coordinates input from a coordinate detector via a plurality of discontinuous holes or openings, cutouts or marks provided on a member which is used to specify the coordinates... |
| 6359985 |
Procedure for marking binary coded data sets |
| Mar-19-2002 |
Disclosed is a method of marking binary-coded data sets, especially image data or audio signals, by applying at least one information unit to a data set. The invention is characterized by the generation... |
| 6351537 |
Verifiable holographic article |
| Feb-26-2002 |
A verifiable holographic article comprises a substrate comprising (a) at least one hologram; and (b) at least one covert image that is convertible to an overt image using a decoding sampling device, e.g.,... |
| 6345100 |
Robust watermark method and apparatus for digital signals |
| Feb-5-2002 |
Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum with... |
| 6337930 |
Image processing apparatus and method for extracting predetermined additional information from digital image data representing an original |
| Jan-8-2002 |
The subject matter of the invention is to add information to image data of multicolor image and monochromatic image. An image processing apparatus capable of adding information on raw data performs a dispersion... |
| 6334187 |
Information embedding method, information extracting method, information embedding apparatus, information extracting apparatus, and recording media |
| Dec-25-2001 |
An apparatus for embedding secret information in an image signal transmitted with a shape signal showing the shape of an object is described. This apparatus comprises an embedding position decision unit... |
| 6330672 |
Method and apparatus for watermarking digital bitstreams |
| Dec-11-2001 |
A signal is encoded, for example, perceptually and, during or after the perceptual coding process, a digital watermark is inserted into a quantized digital information signal resulting from the perceptual... |
| 6320965 |
Secure watermark method and apparatus for digital signals |
| Nov-20-2001 |
Watermark data is encoded in a digitized signal by forming a noise threshold spectrum which represents a maximum amount of imperceptible noise, spread-spectrum chipping the noise threshold spectrum with... |
| 6317505 |
Image marking with error correction |
| Nov-13-2001 |
A method of marking a work of authorship without apparent evidence of data alteration. The work (e.g., an image) is represented by a set of data elements (e.g., pixels). The marking includes providing... |
| 6301363 |
Security document including subtle image and system and method for viewing the same |
| Oct-9-2001 |
A system for viewing a subtle image on a security document is provided including a security document, a document viewer, and a document receiving station. The security document comprises a subtle image... |
| 6301360 |
Method of encoding information using a position-based encoding scheme |
| Oct-9-2001 |
Data sequences comprised of figure-coded units, such as text comprised of ASCII characters, are encoded into another data entity, such as a pixel based image. The encoding implements a positionally-based... |
| 6295360 |
Method and apparatus to defeat composite video signal protection |
| Sep-25-2001 |
A VGA (or other component video signal) output, e.g. from a computer or DVD player, is subject to protection so it is viewable on a VGA monitor. If the component video signal is converted to composite... |
| 6286100 |
Method for hiding message data into media data and a method for extracting that hidden data |
| Sep-4-2001 |
A method for hiding message information into media information in frequency space. The data hiding method has high resistance to removal or change of message information embedded into media information... |
| 6272222 |
Method of and apparatus for manipulating digital data works |
| Aug-7-2001 |
A method of hiding copyright related messages within digital data works is taught. The method relies on modifying data elements in the work according to certain rules which depend on the actual message... |
| 6268866 |
Digital watermarking system for making a digital watermark with few colors of input image |
| Jul-31-2001 |
A digital watermarking system capable of making a digital watermark even in an input image of few colors. An image input section inputs an object image in which a digital watermark is to be made and transforms... |
| 6263086 |
Automatic detection and retrieval of embedded invisible digital watermarks from halftone images |
| Jul-17-2001 |
A system for automatic detection and retrieval of embedded invisible digital watermarks retrieves digital watermarks from halftone images. Specifically, by supplying an image to the system, through a process... |
| 6252963 |
Method and system for preventing reproduction of documents |
| Jun-26-2001 |
A reproduction apparatus includes a lens for imaging a customer-provided original onto an opto-electronic detector for producing image data, and a reproduction system for producing a copy therefrom. The... |
| 6249870 |
Data hiding method and data extraction method using statistical examination |
| Jun-19-2001 |
The invention makes it possible to properly certify a genuine owner, and to inhibit deterioration of image quality of media information to which an embedding operation is performed by adaptively determining... |
| 6249588 |
Method and apparatus for authentication of documents by using the intensity profile of moire patterns |
| Jun-19-2001 |
The present invention relates to a new method and apparatus for authenticating documents such as banknotes, trust papers, securities, identification cards, passports, etc. The documents may be printed... |
| 6233684 |
System for controlling the distribution and use of rendered digital works through watermaking |
| May-15-2001 |
A trusted rendering system for use in a system for controlling the distribution and use of digital works. A trusted rendering system facilitates the protection of rendered digital works which have been... |
| 6222932 |
Automatic adjustment of image watermark strength based on computed image texture |
| Apr-24-2001 |
A system and method of automatically adjusts watermark strength of a watermarked image based on the content of the image. The described system includes a process by which the correct watermark strength... |
| 6212285 |
Method and apparatus for multi-bit zoned data hiding in printed images |
| Apr-3-2001 |
A technique for embedding a tracking number as a series of bits in a printed image alters characteristic parameter values at a set of pseudo-random locations chosen for each bit in an embedding zone. The... |
