Xin Li

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:

6853755, Feb 8, 2005

Filed:

Mar 28, 2001

Appl. No.:

09/820133

Inventors:

Xin Li - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

G06K009/46
G06K009/00
G06K009/62

US Classification:

382239, 382172, 382224

Abstract:

A method of compressing a document, includes preparing an encoded representation of a document by scanning the document to provide a scanner output; classifying the scanner output as belonging to a class of document taken from the document classes consisting of smooth, text, graphics and image; and adaptively compressing the scanner output as a function of the class of the document. A compression apparatus for compressing scanned data, includes a scanner for scanning a document and generating a scanner output; a block-based classifier for classifying the scanner output as belonging to a class of documents taken from the document classes consisting of smooth, text, graphics and image; an adaptive compressor for compressing the scanner output according to a compression mode as a function of the class of document; a storage mechanism for storing compressed scanner output and compression mode information; and a decompressor for decompressing compressed scanner output in accordance with the compression mode information.

US Patent:

6865298, Mar 8, 2005

Filed:

Mar 30, 2001

Appl. No.:

09/823399

Inventors:

Xin Li - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

G06K009/36

US Classification:

382238, 382224

Abstract:

A method for compression of compound images. The method determines a classification for a current pixel based upon its causal neighbors and codes the pixel according to a mode determined by the classification. This coding results in production of a symbol for the pixel and the symbol is then mapped to the output stream.

US Patent:

6873741, Mar 29, 2005

Filed:

Jan 10, 2002

Appl. No.:

10/043759

Inventors:

Xin Li - Vancouver WA, US

Assignee:

Sharp Laboratories of America - Camas WA

International Classification:

G06K009/40

US Classification:

382266, 382252, 382260, 382269, 358 326, 358 327, 358 463

Abstract:

Methods and apparatus for digital data array edge enhancement are disclosed. A local data window containing a data sample s is selected. Minimum and maximum sample values, max and min, are located within the window, and an edge deflection value ed is defined to have a value between max and min. A diffusion quantity is then calculated to move the value of s towards max, if s is greater than ed, or towards min, if s is smaller than ed. This approach has advantages over gradient-based edge-enhancement, including simplicity, convergence speed, and stability.

US Patent:

6898313, May 24, 2005

Filed:

Mar 6, 2002

Appl. No.:

10/092851

Inventors:

Xin Li - Vancouver WA, US
Louis J. Kerofsky - Portland OR, US
Kristine Elizabeth Matthews - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

G06K009/34

US Classification:

382176, 382181, 382190, 382232

Abstract:

A data coder prepares a frame of data for transmission over a data channel. The frame is first broken into a series of non-overlapping blocks. The blocks are analyzed to determine if they are a “picture” block or a “non-picture” block. Picture blocks are compressed to produce one or more layers of data, including a base layer and, optionally, one or more enhanced layers. Non-picture blocks are similarly compressed, but according to different compression procedures. Prior to sending the compressed layers of data to a scheduler for transmission on the data channel, the blocks are checked to see if they have changed more than a threshold amount from the last time they were sent. If the block has changed more than the threshold, the changed block is sent to the scheduler, in compressed form. If the block has not changed more than the threshold, only an indication of the block, and not the block itself, is sent to the scheduler.

US Patent:

6944225, Sep 13, 2005

Filed:

Jul 24, 2001

Appl. No.:

09/912799

Inventors:

Xin Li - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04N007/18

US Classification:

37524019, 37524018

Abstract:

A method of data compression. A multiple-level wavelet transform transforms image data of an original image. Motion compensation is performed on a low-frequency band of the transformed image data. This band is then inversely transformed and used to reconstruct a portion of the original image. The remaining portions of the original image are then reconstructed from that portion. This image data then becomes the basis of the next level of the wavelet transform and is transformed back into the wavelet domain. This process is repeated until all of the levels of the wavelet transform have been used.

US Patent:

7010043, Mar 7, 2006

Filed:

Apr 22, 2002

Appl. No.:

10/127742

Inventors:

Louis J. Kerofsky - Portland OR, US
Xin Li - Vancouver WA, US

Assignee:

Sharp Laboratories of America, Inc. - Camas WA

International Classification:

H04N 7/18

US Classification:

37524019, 37524027

Abstract:

A method in a scalable encoder for reducing the average latency associated with randomly accessing an encoded digital video signal is disclosed. This method may include converting a digital video signal into a first layer having a first degree of quality and a second layer having a second degree of quality that is higher than the first degree of quality. The method may also include encoding the first layer at a first intra-frame rate, and encoding the second layer at a second intra-frame rate that is lower than the first intra-frame rate. A method in a scalable decoder for reducing the average latency associated with randomly accessing an encoded digital video signal is also provided. The method includes accessing a first layer of a digital video signal. The first layer includes the digital video signal encoded at a first degree of quality and a first intra-frame rate. The method also includes accessing a second layer of the digital video signal.

US Patent:

7058570, Jun 6, 2006

Filed:

Feb 10, 2000

Appl. No.:

09/499525

Inventors:

Hong Heather Yu - Plainsboro NJ, US
Xin Li - Princeton NJ, US

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka

International Classification:

G10L 19/04

US Classification:

704219

Abstract:

A computer-implemented method and apparatus for embedding hidden data in an audio signal. An audio signal is received in a base domain and then transformed into a non-base domain, such as cepstrum domain or LP residue domain. The statistical mean manipulation is employed on selected transform coefficients to embed hidden data. The introduced distortion is controlled by psychoacoustic model to ensure the imperceptibility of the embedded hidden data. Scrambling techniques can be plugged in to further increase the security of the data hiding system. The present new audio data hiding scheme provides transparent audio quality, sufficient embedding capacity, and high survivability over a wide range of common signal processing attacks.