DR. TRUONG DAN NGUYEN, D.O.
Osteopathic Medicine at Bob Wilson Dr, San Diego, CA

6393156, May 21, 2002

Jan 6, 1999

09/226586

Truong Q. Nguyen - San Diego CA 92130
Joel A. Rosiene - Colchester CT 06415

G06K 936

382248, 382250, 37524026, 358432

In an apparatus and method for image/video enhancement, pre-processing and post-processing techniques are employed to effectively modify the transforms used in a fixed, standardized data compression coder. In this manner, alternative transforms, for example overlapping-basis-type transforms, are made to be applicable to, and compatible with, various data compression standards, thereby improving system performance.

7197074, Mar 27, 2007

Feb 20, 2003

10/370048

Mainak Biswas - La Jolla CA, US
Truong Q. Nguyen - San Diego CA, US

The Regents of the University of California - Oakland CA

H04N 7/12, G06K 9/36

37524016, 382236

A phase plane correlation motion vector determination method identifies images areas in which motion took place. A reference image is shifted by the candidate motion vectors obtained from the phase plane correlation. The shifted reference image is correlated to determine similarity with the current image and to eliminate spurious motion vectors. Candidate motion vectors are validated to determine valid motion vectors and identify problem areas. In a preferred embodiment, a correlation resolution is set to a sub-block size. Sub-blocks of the reference image are shifted by candidate motion vectors for corresponding blocks. Shifted sub-blocks are correlated with sub-blocks of a current image using a sub-block neighborhood to determine valid vector assignments. Where an assignment proves invalid, global motion parameters are determined to assign motion vectors to sub-blocks where correlation fails.

8605786, Dec 10, 2013

Sep 3, 2008

12/670041

Truong Nguyen - San Diego CA, US
Ai-Mei Huang - San Diego CA, US

The Regents of the University of California - Oakland CA

H04N 7/12

37524016

A preferred method for hierarchical motion vector processing determines reliability levels of blocks in image data according to residual energy levels. Macroblocks of an image frame are merged according to reliability levels of the motion vectors of blocks. Single motion vectors are selected for merged macroblocks. Motion vectors of blocks merged in the step of merging are iteratively assigned by minimizing the bi-directional prediction difference on successively smaller merged blocks. The reliability levels are preferably determined by measure residual energy of both chrominance and luminance components. In preferred embodiments, motion vector correlation is used to assist the MV reliability classification and the merging and iterative assignment. Refinement and smoothing can be conducted on successively finer block sizes. Additionally, preferred methods account for occlusions by choosing only one of forward or backward prediction for occlusion regions depending upon the class of the occlusion.

7623719, Nov 24, 2009

Sep 23, 2004

10/948098

Andrea Molino - Torino, IT
Fabrizio Vacca - Rivarolo Canavese, IT
Mainak Biswas - La Jolla CA, US
Truong Nguyen - San Diego CA, US

The Regents of the University of California - Oakland CA

G06K 9/36

382239, 382240, 382248

A video codec of a preferred embodiment is suitable for implementation on a variety of platforms, including platforms where devices require both encoding and decoding engines. Various features of preferred embodiment codecs reduce complexity for operations such as motion determination. Channel resources are allocated in preferred embodiments unequally, with an allocation being determined based upon channel conditions and the error level in a frame being encoded. A decoder of a preferred embodiment, provided with an error frame and motion vector information may conduct decoding with motion compensation. In an example encoder of the invention, a motion estimator identifies motion vectors using a phase plane correlation technique based on phase quantization, where the phase difference between the Fourier transformed version of blocks in a reference frame and a current frame is estimated by dividing the complex plane into sectors and assigning the Fourier domain difference to the sectors.

2011026, Oct 27, 2011

Oct 15, 2009

13/124659

Yu-Hwa Lo - San Diego CA, US
Yoav Mintz - San Diego CA, US
Truong Nguyen - San Diego CA, US
Jack Tzeng - Seattle WA, US

THE REGENTS OF THE UNIVERSITY OF CALIFORNIA - Oakland CA

H04N 7/18

348 68, 348E07085

The present Invention relates to a camera system suitable for use in minimally invasive surgery (MIS), among other applications. In at least one embodiment, the camera system includes an autonomous miniature camera, a light source assembly providing features such as steerable illumination and a variable radiation angle, and a control and processing unit for processing images acquired by the camera Io generate improved images having reduced blurring using a deblurring algorithm.