Lam Thanh Nguyen

7796829, Sep 14, 2010

Dec 10, 2008

12/331888

Lam Huy Nguyen - Laurel MD, US
Jeffrey P. Sichina - Ocean View DE, US

The United States of America as represented by the Secretary of the Army - Washington DC

G06K 9/40

382260, 342 26 R

A method and system for generating images from projection data; a preferred embodiment comprising inputting projection data from at least one receiving element; generating a first aperture or array of data points containing positional and signal data; arbitrarily and/or randomly removing data points from the first array to form a series of subarrays comprising different sets of data points; generating preliminary images from the subarrays; comparing the corresponding image pixels from two preliminary images to determine for each pixel location the lesser or equal pixel values; forming a merged image from the lesser or equal pixel values; and repeating the comparison of corresponding image pixels of another preliminary image to the merged image to determine the lesser or equal pixel values until a merged image of the desired quality is obtained. A preferred embodiment of the system may comprise at least one processor, comparator and/or image generator.

8193967, Jun 5, 2012

Sep 14, 2010

12/881364

Lam Huy Nguyen - Laurel MD, US
Jeffrey P. Sichina - Ocean View DE, US

The United States of America as represented by the Secretary of the Army - Washington DC

G01S 13/00

342 25F, 342190

A method and system for generating images from projection data comprising inputting first values representing correlated positional and recorded data; forming an image by processing the projection data utilizing a pixel characterization imaging subsystem to form the SAR imagery utilizing one of a back-projection algorithm or range migration algorithm; integrating positional and recorded data from many aperture positions, comprising: forming the complete aperture Acomprising collecting the return radar data, the coordinates of the receiver, and the coordinates of the transmitter for each position k along the aperture of N positions; forming an imaging grid comprising M image pixels; selecting and removing a substantial number of aperture positions to form a sparse aperture Afor L iterations; classifying each pixel in the image into target class based on the statistical distribution of its amplitude across L iterations; otherwise, the pixel is given the value of zero.

8620093, Dec 31, 2013

Oct 19, 2010

12/907496

Lam Huy Nguyen - Laurel MD, US
Trac D Tran - Columbia MD, US

The United States of America as represented by the Secretary of the Army - Washington DC

G06K 9/68

382218, 382220

A system and method for detecting changes by comparing images which cover the same physical area but are collected at different times, the system comprising: at least one input for inputting an image of a target area; the image of the target area having signatures representing outstanding features; at least one processor operating to divide the image of a target area into a plurality of target subimages; at least one memory comprising reference data comprising reference subimages taken at or near the target area at various times, the at least one processor operating to determine a sparse image representation from the reference data; the sparse image representation of the target data being a linear combination of reference data from corresponding reference subimages stored in the at least one memory; the at least one processor operating to compare the target image to the sparse image representation and to match signatures from the target image to the sparse image representation to register the images and perform change detection.

8624773, Jan 7, 2014

Nov 9, 2010

12/942362

Lam Huy Nguyen - Laurel MD, US
Jeffrey Sichina - Ocean View DE, US

The United States of America as represented by the Secretary of the Army - Washington DC

G01S 13/00

342 25A, 342 25 R, 342 70, 342179

A method and system for investigating and displaying an image of an area of interest comprising a moving vehicle; at least one processor for producing an image of the area of interest; at least one first transmitter for emitting first signals substantially in a first direction, the at least one first transmitter being operatively associated with the moving vehicle and the processor; at least one first receiver for receiving backscattered signals resulting from the first radar signals, the at least one first receiver being operatively associated with the moving vehicle and the processor; at least one second transmitter operatively for emitting second signals in a direction substantially opposite to the first direction, the at least one second transmitter being operatively associated with the moving vehicle and the processor; at least one second receiver for receiving backscattered signals resulting from the second signals, the at least one second receiver being operatively associated with the moving vehicle and the processor, a GPS subsystem for providing position data relating to the position of the vehicle; the at least one first receiver and the at least one second receiver operating to provide image data to the at least one processor; the at least one processor operating to combine image data from the at least one first receiver and the at least one second receiver with the position data to form a single image; and a display to display the combined image data.

20110163912, Jul 7, 2011

Mar 11, 2011

13/046250

Kenneth I. Ranney - Rockville MD, US
Jeffrey P. Sichina - Ocean View DE, US
Lam H. Nguyen - Laurel MD, US

U.S. Government as represented by the Secretary of the Army - Adelphi MD

G01S 13/90
G01S 13/00

342 25 F, 342179

A method and system for generating images from projection data comprising: at least one processor for processing input data, the input data comprising positional data and image data, the image data comprising frequency data for a pre-determined number k frequencies the at least one processor operating to: a) set the frequency data to zero for a predetermined percentage of the k frequencies to form modified frequency data; b) form a preliminary image comprising an array of retained pixel values based upon first positional data and the modified frequency data; c) set the frequency data to zero for a predetermined percentage of the k frequencies to form modified frequency data; d) form a modified image comprising an array of pixels based upon the positional data and the modified frequency data; e) compare the retained array of pixel values to the pixel values of the modified image formed at step (d); f) retain the minimum pixel value at each pixel location to form an image comprising minimum pixel values; g) repeat steps (c) through (f) for L iterations each time retaining an array of pixel values; h) output the image of retained pixel values.

20120206293, Aug 16, 2012

Apr 18, 2012

13/449983

LAM H. NGUYEN - LAUREL MD, US
THONG T. DO - Beltsville MD, US

U.S Government as represented by the Secretary of the Army - Adelphi MD

G01S 13/90
G01S 13/00

342 25 F, 342179

A system and method for generating enhanced images of a target area using projection data obtained using an electromagnetic radiation source, the method comprising forming an initial aperture of data points containing positional information of the transmitter and receiver of the electromagnetic radiation; and an associated data record; randomly removing data points from the initial aperture to form subapertures with randomly missing data points; creating a subset of data points from each of the plurality of subapertures; the subsets containing data points containing image data for portions of the target area which are the same or overlapping; comparing the subsets of data points to determine variations in the data points indicative of transient data; based upon the comparison between overlapping subsets of image data, determining whether the subsets of data points comprise image data relating to physical objects or noise.

20120250748, Oct 4, 2012

Mar 9, 2012

13/416062

Lam H. Nguyen - Laurel MD, US
Trac Tran - Columbia MD, US

U.S. Government as represented by the Secretary of the Army - Adelphi MD

H04L 27/00
H04B 17/00

375224, 375316

A method and system of reconstructing data signals from one of incomplete measurements comprising a receiver for receiving data signals, an ADC system operatively connected to the receiver that digitizes the received data signal at a slower rate than the Nyquist rate to obtain sparse measurements; first and second dictionaries comprising a plurality of time shifted responses recovered from the data signal; the first dictionary comprising time shifted versions of the previously observed data signals which are sampled at or above the Nyquist minimum sample rate; the second dictionary comprising time shifted versions are sampled below the Nyquist minimum, and at least one processor for reconstruction of the waveform signals by transforming the sub-Nyquist digitized output using the first and second dictionaries to produce the data signal.

20130236115, Sep 12, 2013

May 22, 2012

13/477282

LAM H. NGUYEN - LAUREL MD, US
THONG T. DO - Beltsville MD, US

U.S. Government as represented by the Secretary of the Army - Adelphi MD

G06K 9/36

382260

A system of recovering information wide band signal comprising a receiver(s) for receiving data signal responses from a target area; the received data signal responses having information missing at a plurality of frequencies; at least one processor for recovery of data from the data signal responses operatively connected to the receiver(s); a first memory comprising time-shifted responses based upon the wide band signal response, a second memory comprising a plurality of spectrally filtered time-shifted responses; whereby the first and second memories operate to provide data to the at least one processor compensate for the information missing at the plurality of frequencies. Also, a method of the recovery of missing frequency bands comprising receiving data signal responses from a target area using a first dictionary comprising time-shifted responses based upon spectra containing the at least one predetermined spectrum, and a second dictionary comprising a plurality of spectrally filtered time-shifted responses.