Hrl Laboratories, LLC

The Boeing Company

Hughes Electronics Corporation

He Holdings, Inc.

Roy M Matic

Peter Petre

David Roderick Gerwe

Xiang-Gen Xia

Vikas Kukshya

Cathy (Xiangming) Kong

Yuri Owechko

Jonathan James Lynch

Jose Cruz-Albrecht

Kang-Yu Ni

Mohiuddin Ahmed

David Aaron Schwartz

Cindy Daniell

Louis Auslander

Mark W Wolboldt

Urban Von Der Embes

Paolo Barbano

Described is a method for accurately reconstructing analog signals. The present invention considers a general parameter estimation problem, extends the utility of compressive sensing to real scenarios, and is able to accurately estimate center frequencies and amplitudes. Specifically, an unknown continuous analog signal comprising a set of arbitrary frequencies and amplitudes is received. A set of non-uniform samples of the unknown continuous analog signal is then obtained at multiple times. Finally, an iterative reconstruction process is utilized to determine a set of frequencies and a set of amplitudes that best fit the set of non-uniform samples in a global minimum problem in order to accurately reconstruct the continuous analog signal.

Accurate reconstruction of frequency-sparse signals with arbitrary frequencies from non-uniform samples

A system, circuit, and methods for increasing speed of an asynchronous pulse processing based hyperspectral target detection algorithm are disclosed. Stored optimized filter coefficients are used to provide initial filter coefficients. The initial filter coefficients are optimized using an asynchronous pulse processor based hyperspectral detection algorithm to provide optimized filter coefficients, and the optimized filter coefficients are stored.

Technique to increase speed of asynchronous pulse processing based hyperspectral target detection algorithm

A compressive sensor for sensing energy including a plurality of detectors for detecting a plurality of electromagnetic modes, wherein each detector has an output and detects at least one electromagnetic mode of the energy, a summer coupled to the plurality of detectors for forming a composite sum of the outputs of the plurality of detectors, and a plurality of switches, each respective switch coupled to a respective detector, wherein the respective switch may be switched to remove the respective detector from the composite sum.

Detector array for compressive sensing

A system, circuit and methods for target detection from hyper-spectral image data are disclosed. Filter coefficients are determined using a modified constrained energy minimization (CEM) method. The modified CEM method can operate on a circuit operable to perform constrained linear programming optimization. A filter comprising the filter coefficients is applied to a plurality of pixels of the hyper-spectral image data to form CEM values for the pixels, and one or more target pixels are identified from the CEM values. The process may be repeated to enhance target recognition by using filter coefficients determined by excluding the identified target pixels from the hyper-spectral image data.

Advanced background estimation technique and circuit for a hyper-spectral target detection method

A time encoding machine (TEM) for time encoding an input signal includes a hysteresis quantizer having a time encoded sequence output and a random sequence generator having a random signal output coupled to the hysteresis quantizer for randomizing switching times of the hysteresis quantizer.

Randomized time encoding machine for sub-nyquist signal sampling

A method and apparatus are presented for performing wavelet transforms, post transform processing and inverse wavelet transforms whereby hardware complexity is reduced and processor performance is enhanced by performing the forward and inverse wavelet transformations and post transform processing in variable precision arithmetic. Optimal decreases in the operational arithmetic precision of different wavelet scale coefficients, multiplication and weighting operations, and other operations, results in reduced computational complexity, increased speed, and in some cases better signal to noise ratios.

Variable precision wavelets

A method and an apparatus for estimating the upper frequency band coefficients solely from low frequency information in a subband multiresolution decomposition. In operation, a Bayesian classifier predicts the significance or insignificance of a high frequency signal, then a neural network estimates the sign and magnitude of the visually significant information and effectively eliminates insignificant information. Finally an algorithm estimates upper frequencies based on lower frequencies within the same band. This estimation is performed recursively for each level of a multiresolution decomposition pyramid until a reconstructed version of the data product is returned.

Subband coefficient prediction with pattern recognition techniques

An object-based image/video coding algorithm that encodes arbitrary shaped objects using LOTs defined on rectangular and L-shaped regions. The regions of support of the blocks in the L-shaped regions are extended to form tapered overlapping regions that meet at the object's exterior and concave corners. The overlapping regions taper to the corners with a slope having a magnitude .delta./.epsilon., where .delta. and .epsilon. are the amounts of overlap between the blocks. This allows the basis and tapered window functions to be defined in the L-shaped region and specifically in the tapered overlapping regions in a manner that maintains the orthogonality of the basis functions while providing a smooth transition at the edges.

Object-based video coding of arbitrarily shaped objects using lapped

A codeword generator produces codewords in the form of digital electronic signals which may be employed, for example, in spread spectrum communications system or RADAR systems. The generator effects a mixing ergodic transformation upon a suitable irrational number to produce a complex number sequence. The generator truncates the complex number sequence to a predetermined length, thus forming a codeword. The generator then forms other codewords within a family by permuting this first codeword. Other families of codewords may be generated by employing another mixing ergodic transform to transform the same irrational number or another suitable irrational number.

CDMA code generator employing mixing ergodic transformation

A reconfigurable optical beam splitter and method establishes replicated periods of optical phase shift regions across a liquid crystal cell to form an optical grating in the liquid crystal. A non-linear pattern of phase shift regions is established within each period of the grating to split an input beam into a multi-beam output, or to combine multiple input beams into a single output beam. The desired pattern of phase shift regions is established by applying corresponding voltage differentials across the cell, between an electrode array on one side of the cell and a common counter electrode on the other side. The voltage differential pattern can be dynamically changed to impart a corresponding dynamic reconfiguration of the output beam pattern. The most efficient voltage differential pattern for any particular output is established by initially selecting a tentative voltage differential pattern, determining the optical efficiency of the processing method with the tentative pattern, and then applying a non-linear optimization algorithm to derive a voltage differential pattern that corresponds to a maximum optical efficiency.

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Newbury Park, CA, United States of America

Roy M Matic