Patents by Inventor Trac D. Tran
Trac D. Tran has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10484628Abstract: A pixel having a variable exposure for a scene capture device, the pixel comprising a photodiode, a buffer and a memory element and a switching mechanism. The memory element is configured to store an exposure control bit and the switching mechanism configured to control a variable exposure period of the photodiode based on the exposure control bit and to reset a voltage on said photodiode to a reference voltage.Type: GrantFiled: October 16, 2017Date of Patent: November 19, 2019Assignee: THE JOHNS HOPKINS UNIVERSITYInventors: Jie Zhang, Ralph Etienne-Cummings, Tao Xiong, Trac D. Tran, Sang H. Chin
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Patent number: 10228449Abstract: A system for reception of electromagnetic waves in a spectrum in which interference with radio frequencies of other electronics devices occurs comprising a transmitter; at least one receiver configured to receive the received signal; each received signal organized into a digital vector; at least one memory portion configured to store a plurality of received signals in a vector form; the vectors being combined into a matrix, each vector of the matrix being a digital data record representing a received signal; at least one processor operatively connected to the at least one memory portion; the at least one processor configured to estimate that portion of the received signal attributable to noise; the at least one processor operating to jointly estimate a minimal number of distinctive noise patterns and minimize the simplicity of the data of interest; the at least processor operating to process the noise and data of interest separately.Type: GrantFiled: June 7, 2016Date of Patent: March 12, 2019Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Lam H. Nguyen, Trac D. Tran
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Publication number: 20180115725Abstract: A pixel having a variable exposure for a scene capture device, the pixel comprising a photodiode, a buffer and a memory element and a switching mechanism. The memory element is configured to store an exposure control bit and the switching mechanism configured to control a variable exposure period of the photodiode based on the exposure control bit and to reset a voltage on said photodiode to a reference voltage.Type: ApplicationFiled: October 16, 2017Publication date: April 26, 2018Inventors: Jie Zhang, Ralph Etienne-Cummings, Tao Xiong, Trac D. Tran, Sang H. Chin
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Publication number: 20160341814Abstract: A system for reception of electromagnetic waves in a spectrum in which interference with radio frequencies of other electronics devices occurs comprising a transmitter; at least one receiver configured to receive the received signal; each received signal organized into a digital vector; at least one memory portion configured to store a plurality of received signals in a vector form; the vectors being combined into a matrix, each vector of the matrix being a digital data record representing a received signal; at least one processor operatively connected to the at least one memory portion; the at least one processor configured to estimate that portion of the received signal attributable to noise; the at least one processor operating to jointly estimate a minimal number of distinctive noise patterns and minimize the simplicity of the data of interest; the at least processor operating to process the noise and data of interest separately.Type: ApplicationFiled: June 7, 2016Publication date: November 24, 2016Applicant: U.S. Army Research Laboratory ATTN: RDRL-LOC-IInventors: Lam H. Nguyen, Trac D. Tran
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Patent number: 9363024Abstract: A system for reception of electromagnetic waves in spectrum in which interference occurs comprising at least one transmitter; at least one receiver configured to receive the received signal; a first memory portion configured to store data relating to a point target response; a spectrum estimator configured to estimate the frequencies at which interfering signals occur; at least one processor configured to generate an estimation of the interfering signals at the frequencies estimated by the spectrum estimator; a second memory portion operatively connected to the at least one processor configured to store the estimation of the components of the interfering signals; the at least one processor configured to substantially reduce or eliminate radio frequency interfering signals from the received signal utilizing the point target response and the estimation of the interfering signals; and a method to substantially reduce or eliminate radio frequency interfering signals from for image data.Type: GrantFiled: August 6, 2014Date of Patent: June 7, 2016Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Lam H. Nguyen, Trac D. Tran
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Patent number: 9172476Abstract: A method and system for reception of electromagnetic waves in which interference with radio frequencies of other electronics devices occurs comprising; at least one transmitter for transmitting electromagnetic radiation at a wide range of frequencies; at least one receiver fix receiving the received signal comprising the first electromagnetic radiation and RF interfering signal data; a first memory portion for storing transmitted signal waveforms; a second memory portion for storing RF interfering signal data; a switch for periodically allowing the RF interfering signal data to enter the second memory portion from the receiver; the at least one processor operating to process and compare the received signal containing RE signal data and first electromagnetic radiation by matching the received signal against data relating to the transmitted signal waveforms from the first memory portion and RF interfering signal data from the second memory portion, and extract the RF interfering signal data.Type: GrantFiled: May 9, 2013Date of Patent: October 27, 2015Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Lam Huy Nguyen, Trac D. Tran
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Publication number: 20140347213Abstract: A system for reception of electromagnetic waves in spectrum in which interference occurs comprising at least one transmitter; at least one receiver configured to receive the received signal; a first memory portion configured to store data relating to a point target response; a spectrum estimator configured to estimate the frequencies at which interfering signals occur; at least one processor configured to generate an estimation of the interfering signals at the frequencies estimated by the spectrum estimator; a second memory portion operatively connected to the at least one processor configured to store the estimation of the components of the interfering signals; the at least one processor configured to substantially reduce or eliminate radio frequency interfering signals from the received signal utilizing the point target response and the estimation of the interfering signals; and a method to substantially reduce or eliminate radio frequency interfering signals from for image data.Type: ApplicationFiled: August 6, 2014Publication date: November 27, 2014Inventors: Lam H. Nguyen, Trac D. Tran
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Patent number: 8861588Abstract: 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.Type: GrantFiled: March 9, 2012Date of Patent: October 14, 2014Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Lam Huy Nguyen, Trac D Tran
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Patent number: 8620093Abstract: 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 perfoType: GrantFiled: October 19, 2010Date of Patent: December 31, 2013Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Lam Huy Nguyen, Trac D Tran
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Patent number: 8548265Abstract: This invention relates to the design and implementation of a large family of fast, efficient, hardware-friendly fixed-point multiplierless inverse discrete cosine transforms (IDCT) and the corresponding forward transform counterparts. All of the proposed structures comprises of butterflies and dyadic-rational lifting steps that can be implemented using only shift-and-add operations. The approach also allows the computational scalability with different accuracy-versus-complexity trade-offs. Furthermore, the lifting construction allows a simple construction of the corresponding multiplierless forward DCT, providing bit-exact reconstruction if properly pairing with our proposed IDCT. With appropriately-chosen parameters, all of the disclosed structures can easily pass IEEE-1180 test.Type: GrantFiled: January 4, 2007Date of Patent: October 1, 2013Assignee: FastVDO, LLCInventors: Trac D. Tran, Pankaj N. Topiwala
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Patent number: 8155462Abstract: A reconstruction system for digital signals processed by the laplacian pyramid including a master lifting-based parameterization reconstruction scheme. The system also involves the design of low-complexity FIR linear-phase integer-coefficient filtering operators for lapacian pyramid decimation and interpolation stages that deliver a minimum mean-squared error reconstruction.Type: GrantFiled: December 31, 2007Date of Patent: April 10, 2012Assignee: FastVDO, LLCInventors: Trac D. Tran, Lijie Liu, Pankaj N. Topiwala
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Publication number: 20120063689Abstract: A method of identifying an object in an image includes selecting a portion of a target image of a target object, selecting a corresponding window portion of a reference image of a reference object from at least one reference image of at least one reference object, the position of the window portion within the reference image corresponding to the position of the portion of the target image within the target image, generating a reference set including a plurality of different portions of the reference image from within the window portion, determining a weighted combination of the plurality of different portions from the reference set approximating the portion of the target image, and determining whether the target object matches the reference object based on the weighted combination.Type: ApplicationFiled: September 15, 2011Publication date: March 15, 2012Applicant: The Johns Hopkins UniversityInventors: Trac D. Tran, Chen Yi, Thong T. Do
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Publication number: 20110222781Abstract: 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 perfoType: ApplicationFiled: October 19, 2010Publication date: September 15, 2011Applicant: U.S. Government as represented by the Secretary of the ArmyInventors: LAM HUY NGUYEN, TRAC D. TRAN
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Publication number: 20080175500Abstract: A reconstruction system for digital signals processed by the laplacian pyramid including a master lifting-based parameterization reconstruction scheme. The system also involves the design of low-complexity FIR linear-phase integer-coefficient filtering operators for lapacian pyramid decimation and interpolation stages that deliver a minimum mean-squared error reconstruction.Type: ApplicationFiled: December 31, 2007Publication date: July 24, 2008Inventors: Trac D. Tran, Lijie Liu, Pankaj N. Topiwala
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Patent number: 6771829Abstract: A transform-based image compression framework called local zerotree (LZT) coding partitions the transform coefficients into small groups, each of which is encoded independently using popular zerotree algorithms. The LZT coder achieves similar coding performances as current state-of-the-art embedded coders. The advantage of this coding method is fourfold: (i) because of the reduction of memory buffering, LZT reduces the complexity of the codec implementation and increase the speed of the zerotree algorithm significantly, especially in hardware; (ii) LZT processes large images under limited memory constraint; (iii) LZT supports parallel processing mode as long as the transform in use has that capability; and (iv) LZT facilitates the coding/decoding of regions of interest. The penalty in coding performance is minute compared to global zerotree predecessors in that there are only a few extra bytes of side information.Type: GrantFiled: October 23, 2000Date of Patent: August 3, 2004Assignee: Fastvdo LLCInventors: Pankaj N. Topiwala, Trac D. Tran
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Patent number: 6421464Abstract: This invention introduces a class of multi-band linear phase lapped biorthogonal transforms with fast, VLSI-friendly implementations via lifting steps called the LiftLT. The transform is based on a lattice structure which robustly enforces both linear phase and perfect reconstruction properties. The lattice coefficients are parameterized as a series of lifting steps, providing fast, efficient in-place computation of the transform coefficients as well as the ability to map integers to integers. Our main motivation of the new transform is its application in image and video coding. Comparing to the popular 8×8 DCT, the 8×16 LiftLT only requires 1 more multiplication, 22 more additions, and 6 more shifting operations. However, image coding examples show that the LiftLT is far superior to the DCT in both objective and subjective coding performance. Thanks to properly designed overlapping basis functions, the LiftLT can completely eliminate annoying blocking artifacts.Type: GrantFiled: December 16, 1998Date of Patent: July 16, 2002Assignee: FastVDO LLCInventors: Trac D. Tran, Pankaj Topiwala
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Patent number: 6373981Abstract: An improved technique for compressing a color or gray scale pixel map representing a document using an MRC format includes a method of segmenting an original pixel map into two planes, and then compressing the data or each plane in an efficient manner is disclosed. The image is segmented by separating the image into two portions at the edges. One plane contains image data for the dark sides of the edges, while image data for the bright sides of the edges and the smooth portions of the image are placed on the other plane. A thresholding technique and apparatus for generating a bitmap is also disclosed that may be used to accomplish these tasks is also disclosed.Type: GrantFiled: December 21, 1998Date of Patent: April 16, 2002Assignee: Xerox CorporationInventors: Ricardo L. de Queiroz, Zhigang Fan, Trac D. Tran
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Patent number: 6101279Abstract: An data compression technique combines the benefits of block-wise processing, such as allows reduced buffer memory usage and improved speed through parallel techniques, with tree-type compression normally associated with wavelet-type compression techniques. Block artifacts in the reconstructed data at the partitions between blocks are minimized by use of lapping transformations.Type: GrantFiled: June 5, 1998Date of Patent: August 8, 2000Assignee: Wisconsin Alumni Research FoundationInventors: Truong Q. Nguyen, Trac D. Tran, Yu Hen Hu
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Patent number: RE40081Abstract: This invention introduces a class of multi-band linear phase lapped biorthogonal transforms with fast, VLSI-friendly implementations via lifting steps called the LiftLT. The transform is based on a lattice structure which robustly enforces both linear phase and perfect reconstruction properties. The lattice coefficients are parameterized as a series of lifting steps, providing fast, efficient in-place computation of the transform coefficients as well as the ability to map integers to integers. Our main motivation of the new transform is its application in image and video coding. Comparing to the popular 8×8 DCT, the 8×16 LiftLT only requires 1 more multiplication, 22 more additions, and 6 more shifting operations. However, image coding examples show that the LiftLT is far superior to the DCT in both objective and subjective coding performance. Thanks to properly designed overlapping basis functions, the LiftLT can completely eliminate annoying blocking artifacts.Type: GrantFiled: July 29, 2003Date of Patent: February 19, 2008Assignee: Fast VDO LLCInventors: Trac D. Tran, Pankaj Topiwala