Min Wu

Author:

Min Wu

ISBN #:

0387954260

US Patent:

6456726, Sep 24, 2002

Filed:

Oct 26, 1999

Appl. No.:

09/427321

Inventors:

Hong Heather Yu - Plainsboro NJ
Min Wu - Princeton NJ
Xin Li - Princeton NJ
Alexander D. Gelman - Brooklyn NY

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G06K 900

US Classification:

382100, 713176, 348463

Abstract:

A data hiding system and method for providing a method of embedding multiple layers of hidden data into multimedia data. First, a media unit of the multimedia data is evaluated to determine an appropriate embedding procedure. Next during a first embedding pass, a ruling layer of primary hidden data is embedded into the media unit. In another embedding pass, a governing layer of secondary hidden data is embedded on top of the ruling layer. The secondary hidden data provides control information for controlling the primary hidden data and the host data. Control information such as error correction data, synchronization data, decoding data, and authentication data is embedded in the governing layer. Embedding schemes such as base domain and spectrum domain embedding are employed.

US Patent:

6611608, Aug 26, 2003

Filed:

Oct 18, 2000

Appl. No.:

09/691544

Inventors:

Min Wu - Princeton NJ
Hong Heather Yu - Plainsboro NJ

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G06K 900

US Classification:

382100, 713176, 713179

Abstract:

A method and apparatus of hiding identification data in visual media. When image or video data is received, frequency masking is performed to divide the image or video data into blocks of smooth regions and blocks of non-smooth regions and to obtain preliminary just-noticeable-difference. Edge detection is performed to divide the non-smooth region of the image or video data into texture blocks and edge blocks. Then blocks of regions that are substantially proximate to blocks of smooth regions of the image or video data are determined. The image or video data is then adjusted by applying different strength of watermark in association with the type of each block.

US Patent:

6947378, Sep 20, 2005

Filed:

Feb 28, 2001

Appl. No.:

09/795952

Inventors:

Min Wu - Princeton NJ, US
Robert A. Joyce - Princeton NJ, US
Anthony Vetro - Staten Island NY, US
Hau-San Wong - Causeway Bay, HK
Ling Guan - Bexley North, AU
Sun-Yuan Kung - Princeton NJ, US

Assignee:

Mitsubishi Electric Research Labs, Inc. - Cambridge MA

International Classification:

G01R031/08
G06F011/00
G08C015/00
H04L001/00
H04L012/26

US Classification:

370229, 370241, 7042701

Abstract:

A method for dynamically allocating network resources while transferring multimedia at variable bit-rates in a network extracts first content features from the multimedia to determine renegotiation points and observation periods. Second content features and traffic features are extracted from the multimedia bit stream during the observation periods. The second content features and the traffic features are combined in a neural network to predict the network resources to be allocated at the renegotiation points.

US Patent:

62823000, Aug 28, 2001

Filed:

Jan 21, 2000

Appl. No.:

9/489752

Inventors:

Jeffrey A. Bloom - Plainsboro NJ
Ingemar J. Cox - Lawrenceville NJ
Matthew L. Miller - Princeton NJ
Min Wu - Princeton NJ
Ching-Yung Lin - New York NY
Yui Man Lui - Middle Island NY

Assignee:

Signafy, Inc. - Princeton NJ

International Classification:

H04K 100

US Classification:

382100

Abstract:

A method for detecting a watermark signal in digital image data. The detecting method includes the steps of: computing a log-polar Fourier transform of the image data to obtain a log-polar Fourier spectrum; projecting the log-polar Fourier spectrum down to a lower dimensional space to obtain an extracted signal; comparing the extracted signal to a target watermark signal; and declaring the presence or absence of the target watermark signal in the image data based on the comparison. Also provided is a method for inserting a watermark signal in digital image data to obtain a watermarked image. The inserting method includes the steps of: computing a log-polar Fourier transform of the image data to obtain a log-polar Fourier spectrum; projecting the log-polar Fourier spectrum down to a lower dimensional space to obtain an extracted signal; modifying the extracted signal such that it is similar to a target watermark; performing a one-to-many mapping of the modified signal back to log-polar Fourier transform space to obtain a set of watermarked coefficients; and performing an inverse log-polar Fourier transform on the set of watermarked coefficients to obtain a watermarked image.

US Patent:

62857754, Sep 4, 2001

Filed:

Oct 1, 1998

Appl. No.:

9/164474

Inventors:

Min Wu - Princeton NJ
Bede Liu - Princeton NJ

Assignee:

The Trustees of the University of Princeton - Princeton NJ

International Classification:

G06K 900

US Classification:

382100

Abstract:

A digital watermarking process whereby an invisible watermark inserted into a host image is utilized to determine whether or not the image has been altered and, if so, where in the image such alteration occurred. The watermarking method includes the steps of providing a look-up table containing a plurality of coefficients and corresponding values; transforming the image into a plurality of blocks, wherein each block contains coefficients matching coefficients in the look-up table; and embedding the watermark in the image by performing the following substeps for at least some of the blocks: First, a coefficient is selected for insertion of a marking value representative of a corresponding portion of the watermark. Next, the value of the selected coefficient to used to identify a corresponding value in the look-up table. Finally, the identified coefficient is left unchanged if the corresponding value is the same as the marking value, and is changed if the corresponding value is different from the marking value.