WILLIAM CHEN, LAC
Acupuncture at El Camino Real, San Mateo, CA

7751478, Jul 6, 2010

Jan 21, 2005

11/041141

Changick Kim - Cupertino CA, US
William Chen - Foster City CA, US
Vasudev Bhaskaran - Sunnyvale CA, US

Seiko Epson Corporation - Tokyo

H04N 7/18

37524012, 37524013

A prediction mode for encoding data is selected using a reduced number of rate-distortion cost computations. This reduction in rate-distortion cost computations is caused by filtering the number of potential intra prediction modes based on two criteria. First, the number of potential prediction modes is reduced based on at least one characteristic of a quantization procedure performed during the encoding procedure. Second, the number of potential prediction modes is reduced based on an error value calculated for each of the potential prediction modes.

2005002, Feb 3, 2005

Feb 20, 2004

10/783696

William Chen - Foster City CA, US

H04N007/14, H04N011/04

348014130, 348014080

In a video conference system in which multiple video codecs are simultaneously operating to transmit video, audio and other data between participants in real-time, sharing the system's available resources, this invention provides a way for each codec to adapt to changing network load conditions caused by, for example, participants (and hence codecs) joining/leaving the conference (system). To support video in this type of dynamic environment, the codec is designed for complexity and distortion control and is able to make intelligent tradeoffs between complexity, rate, and distortion. For complexity control, the codec monitors the available computational resources of the system during run-time and adapts its encoding/decoding algorithms to best match the complexity measurements. For distortion control, the codec overcomes the limitations of poor quality video at low bit-rates and allows the user to improve the quality of the video in select regions-of-interest.

6950473, Sep 27, 2005

Jun 21, 2002

10/176994

Changick Kim - Cupertino CA, US
William Chen - Foster City CA, US
Vasudev Bhaskaran - Mountain View CA, US

Seiko Epson Corporation - Tokyo

H04N007/12

37524029

A power-scalable hybrid technique to reduce blocking and ringing artifacts in low bit-rate block-based video coding is employed in connection with a modified decoder structure. Fast inverse motion compensation is applied directly in the compressed domain, so that the transform (e. g. , DCT) coefficients of the current frame can be reconstructed from those of the previous frame. The spatial characteristics of each block is calculated from the DCT coefficients, and each block is classified as either low-activity or high-activity. For each low-activity block, its DC coefficient value and the DC coefficient values of the surrounding eight neighbor blocks are exploited to predict low frequency AC coefficients which reflect the original coefficients before quantization in the encoding stage. The predicted AC coefficients are inserted into the low activity blocks where blocking artifacts are most noticeable. Subject to available resources, this may be followed by spatial domain post-processing, in which two kinds of low-pass filters are adaptively applied, on a block-by-block basis, according to the classification of the particular block.

2005002, Feb 3, 2005

Jul 31, 2003

10/631155

Viresh Ratnakar - Sunnyvale CA, US
William Chen - Foster City CA, US

H04N007/14

348014130

An encoder/decoder (codec) is configured to cause the coding/decoding algorithms used by the codec to dynamically adapt according to the available computational resources in response to actual complexity measurements performed at run-time. In a system in which multiple video codecs have to operate simultaneously in real-time, sharing the system's available resources, this invention provides a way to increase the number of simultaneous codecs that can co-exist. The principles of the invention are also applicable to an individual encoder and an individual decoder.

2004015, Aug 12, 2004

Feb 7, 2003

10/360977

Viresh Ratnakar - Sunnyvale CA, US
William Chen - Foster City CA, US
Changick Kim - Cupertino CA, US
Vasudev Bhaskaran - Sunnyvale CA, US
Onur Guleryuz - Sunnyvale CA, US

H04N007/16

725/150000

A method for decoding digital video data in a power scalable manner is provided. The method initiates with monitoring a power level available for the video decoding system. Then, threshold power levels are identified. In response to the power level available crossing one of the threshold power levels, the method includes changing both a power consumption level associated with the video decoding system and a video presentation quality. A method for determining optimum pairings of power consumption and video quality for a video decoding system is also provided. In addition, a power scalable video device, an integrated circuit chip for a video decoding system and a graphical user interface are provided.

8170102, May 1, 2012

Dec 19, 2005

11/305927

Vasudev Bhaskaran - Sunnyvale CA, US
Norihisa Hagiwara - Suwa, JP
William Chen - Foster City CA, US
Changick Kim - Yuseong-gu, KR

Seiko Epson Corporation - Tokyo

H04N 3/24, H04B 7/12, H04B 3/46, H03H 7/30

37524013, 375225, 375232

An inter mode for encoding a video macroblock is selected. An initial analysis on the macroblock homogeneity is performed to quickly reduce the number of inter modes for which motion estimation and rate distortion calculation are to be performed. An inter mode is selected based on these calculations and sub-pixel motion estimation, at various sub-pixel interpolation granularities, is performed only on the selected inter mode. Sub-pixel motion estimation may be skipped for macroblocks that exhibit relatively low distortion at the integer pixel level.

7606304, Oct 20, 2009

Jan 18, 2007

11/624598

William Chen - Foster City CA, US
Vasudev Bhaskaran - Sunnyvale CA, US

Seiko Epson Corporation - Tokyo

H04B 1/66, H04N 11/02, H04N 11/04

37524002

A method for reducing the memory requirements for decoding a bit stream is provided. The method initiates with receiving a video bit stream. Then, a frame of the bit stream is decoded into a discrete cosine transform (DCT) domain representation. Next, non-zero coefficients of the DCT domain representation are identified. Then, a hybrid data structure is assembled. The hybrid data structure includes a fixed size array and a variable size overflow vector. Next, the non-zero coefficients of the DCT domain representation are inserted into the hybrid data structure. A computer readable media, a printed circuit board and a device configured to decode video data are also provided.

7466845, Dec 16, 2008

Aug 29, 2005

11/214255

Vasudev Bhaskaran - Sunnyvale CA, US
William Chen - Foster City CA, US

Seiko Epson Corporation - Tokyo

G06K 9/00, G06K 9/54, G06K 9/60

382112, 382305, 7071041, 358 19, 358 326

An interactive photo system that provides an interesting and entertaining way to link photos from the digital and analog domains. The system enables easy conversion of a paper-based photo into digital form. The conversion process generally involves a user holding up a paper-based photo image in front of a camera of the system, such that the captured image is rendered in a specific location on a display screen. The system adjusts the captured image for orientation and illumination irregularities in creating a digital version of the paper-based photo. The system further includes a database of digital images and a content retrieval engine to which content from the just-converted digital image can be used as a search query to search the database for other similar digital photos.