Patents by Inventor Nikos Pitsianis
Nikos Pitsianis 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: 7616306Abstract: An optical wavemeter includes a slit, a diffraction grating, a mask, a complementary grating, and a detector. A monochromatic source is incident on the slit. The diffraction grating produces an image of the slit in an image plane at a horizontal position that is wavelength dependent. The mask has a two-dimensional pattern of transmission variations and produces different vertical intensity channels for different spectral channels. The complementary grating produces a stationary image of the slit independent of wavelength. The detector measures vertical variations in intensity of the stationary image, and the mask is created so that the number of measurements made by the detector is less than the number of spectral channels sampled.Type: GrantFiled: July 31, 2007Date of Patent: November 10, 2009Assignee: Duke UniversityInventors: David J. Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Patent number: 7463179Abstract: An optical signal is compressively sampled using an optical component to encode multiplex measurements. A mapping from the optical signal to a detector array is created using spatial and/or spectral dispersion. Signals transmitted by a plurality of transmissive elements of the optical component are detected at each sensor of a plurality of sensors of the detector array dispersed spatially with respect to the optical component. Each sensor of a plurality of sensors produces a measurement resulting in a number of measurements. A number of estimated optical signal values is calculated from the number of measurements and a transmission function. The transmission function is selected so that the number of measurements is less than the number of estimated optical signal values.Type: GrantFiled: July 31, 2007Date of Patent: December 9, 2008Assignee: Duke UniversityInventors: David J. Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Patent number: 7463174Abstract: An optical signal is compressively sampled. An optical component with a plurality of transmissive elements and a plurality of opaque elements is created. The location of the plurality of transmissive elements and the plurality of opaque elements is determined by a transmission function. A spectrum of the optical signal is dispersed across the optical component. Signals transmitted by the plurality of transmissive elements are detected in a single time step at each sensor of a plurality of sensors dispersed spatially with respect to the optical component. Each sensor of the plurality of sensors produces a measurement resulting in a number of measurements for the single time step. A number of estimated optical signal values is calculated from the number of measurements and the transmission function. The transmission function is selected so that the number of measurements is less than the number of estimated optical signal values.Type: GrantFiled: July 31, 2007Date of Patent: December 9, 2008Assignee: Duke UniversityInventors: David J. Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Patent number: 7432843Abstract: A signal is temporally compressively sampled. A plurality of analog to digital converters are assembled to sample the signal. Each analog to digital converter of the plurality of analog to digital converters is configured to sample the signal at a time step determined by a temporal sampling function. The signal is sampled over a period of time using the plurality of analog to digital converters. Each analog to digital converter of the plurality of analog to digital converters produces a measurement resulting in a number of measurements for the period of time. A number of estimated signal values are calculated from the number of measurements and the temporal sampling function. The temporal sampling function is selected so that the number of measurements is less than the number of estimated signal values.Type: GrantFiled: July 31, 2007Date of Patent: October 7, 2008Assignee: Duke UniversityInventors: David J. Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Publication number: 20080129568Abstract: A transmission mask or coded aperture is used in spectroscopy to compressively sample an optical signal. The locations of transmissive and opaque elements of the mask are determined by a transmission function. The optical signal transmitted by the mask is detected at each sensor of a plurality of sensors dispersed spatially with respect to the mask. A number of estimated optical signal values is calculated from sensor measurements and the transmission function. The optical signal is compressed by selecting the transmission function so that the number of measurements is less than the number of estimated optical signal values. A reconstructed optical signal is further calculated using signal inference. An imaging system created from plurality of encoded subimaging systems compressively samples an optical signal.Type: ApplicationFiled: July 31, 2007Publication date: June 5, 2008Inventors: David J. Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Publication number: 20080080773Abstract: A transmission mask or coded aperture is used in spectroscopy to compressively sample an optical signal. The locations of transmissive and opaque elements of the mask are determined by a transmission function. The optical signal transmitted by the mask is detected at each sensor of a plurality of sensors dispersed spatially with respect to the mask. A number of estimated optical signal values is calculated from sensor measurements and the transmission function. The optical signal is compressed by selecting the transmission function so that the number of measurements is less than the number of estimated optical signal values. A reconstructed optical signal is further calculated using signal inference. An imaging system created from plurality of encoded subimaging systems compressively samples an optical signal.Type: ApplicationFiled: July 31, 2007Publication date: April 3, 2008Inventors: David Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Publication number: 20080074292Abstract: A transmission mask or coded aperture is used in spectroscopy to compressively sample an optical signal. The locations of transmissive and opaque elements of the mask are determined by a transmission function. The optical signal transmitted by the mask is detected at each sensor of a plurality of sensors dispersed spatially with respect to the mask. A number of estimated optical signal values is calculated from sensor measurements and the transmission function. The optical signal is compressed by selecting the transmission function so that the number of measurements is less than the number of estimated optical signal values. A reconstructed optical signal is further calculated using signal inference. An imaging system created from plurality of encoded subimaging systems compressively samples an optical signal.Type: ApplicationFiled: July 31, 2007Publication date: March 27, 2008Inventors: David Brady, Nikos Pitsianis, Xiaobai Sun, Pransant Potuluri
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Publication number: 20080074663Abstract: A transmission mask or coded aperture is used in spectroscopy to compressively sample an optical signal. The locations of transmissive and opaque elements of the mask are determined by a transmission function. The optical signal transmitted by the mask is detected at each sensor of a plurality of sensors dispersed spatially with respect to the mask. A number of estimated optical signal values is calculated from sensor measurements and the transmission function. The optical signal is compressed by selecting the transmission function so that the number of measurements is less than the number of estimated optical signal values. A reconstructed optical signal is further calculated using signal inference. An imaging system created from plurality of encoded subimaging systems compressively samples an optical signal.Type: ApplicationFiled: July 31, 2007Publication date: March 27, 2008Inventors: David Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Publication number: 20080016262Abstract: Techniques for providing improved data distribution to and collection from multiple memories are described. Such memories are often associated with and local to processing elements (PEs) within an array processor. Improved data transfer control within a data processing system provides support for radix 2, 4 and 8 fast Fourier transform (FFT) algorithms through data reordering or bit-reversed addressing across multiple PEs, carried out concurrently with FET computation on a digital signal processor (DSP) array by a DMA unit. Parallel data distribution and collection through forms of multicast and packet-gather operations are also supported.Type: ApplicationFiled: July 9, 2007Publication date: January 17, 2008Applicant: Altera CorporationInventors: Edwin Barry, Nikos Pitsianis, Kevin Coopman
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Patent number: 7283231Abstract: A transmission mask or cooled aperture is used in spectroscopy to compressively sample an optical signal. The locations of transmissive and opaque elements of the mask are determined by a transmission function. The optical signal transmitted by the mask is detected at each sensor of a plurality of sensors dispersed spatially with respect to the mask. A number of estimated optical signal values is calculated from sensor measurements and the transmission function. The optical signal is compressed by selecting the transmission function so that the number of measurements is less than the number of estimated optical signal values. A reconstructed optical signal is further calculated using signal inference. An imaging system created from plurality of encoded subimaging systems compressively samples an optical signal.Type: GrantFiled: July 19, 2005Date of Patent: October 16, 2007Assignee: Duke UniversityInventors: David J. Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Publication number: 20060038705Abstract: A transmission mask or cooled aperture is used in spectroscopy to compressively sample an optical signal. The locations of transmissive and opaque elements of the mask are determined by a transmission function. The optical signal transmitted by the mask is detected at each sensor of a plurality of sensors dispersed spatially with respect to the mask. A number of estimated optical signal values is calculated from sensor measurements and the transmission function. The optical signal is compressed by selecting the transmission function so that the number of measurements is less than the number of estimated optical signal values. A reconstructed optical signal is further calculated using signal inference. An imaging system created from plurality of encoded subimaging systems compressively samples an optical signal.Type: ApplicationFiled: July 19, 2005Publication date: February 23, 2006Inventors: David Brady, Nikos Pitsianis, Xiaobai Sun, Prasant Potuluri
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Publication number: 20050289259Abstract: Techniques for providing improved data distribution to and collection from multiple memories are described. Such memories are often associated with and local to processing elements (PEs) within an array processor. Improved data transfer control within a data processing system provides support for radix 2, 4 and 8 fast Fourier transform (FFT) algorithms through data reordering or bit-reversed addressing across multiple PEs, carried out concurrently with FFT computation on a digital signal processor (DSP) array by a DMA unit. Parallel data distribution and collection through forms of multicast and packet-gather operations are also supported.Type: ApplicationFiled: August 19, 2005Publication date: December 29, 2005Applicant: PTS CorporationInventors: Edwin Barry, Nikos Pitsianis, Kevin Coopman
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Publication number: 20050254047Abstract: Selected combinations from three or more light excitation wavelengths are serially impinged on a sample based on an encoding pattern. A plurality of spectra is detected from the sample responsive to respective ones of the selected combinations of light excitation wavelengths. A shifted Raman excitation spectral component and a non-shifted spectral component characteristic of the sample are identified based on the plurality of spectra.Type: ApplicationFiled: May 11, 2004Publication date: November 17, 2005Inventors: David Brady, Nikos Pitsianis, Zhaochun Xu
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Publication number: 20050162539Abstract: An imaging system includes an array of lenses, a plurality of sensor pixels for each lens, the sensor pixels being on an image plane of the imaging system, and a corresponding plurality of focal plane coding elements. A focal plane coding element for each sensor pixel has multiple sub-pixel resolution elements. The focal plane coding element being between the lens and each sensor pixel, wherein sub-pixel resolution elements over the plurality of focal plane coding elements represent a selected transform matrix having a non-zero determinant.Type: ApplicationFiled: February 24, 2004Publication date: July 28, 2005Inventors: David Brady, Michael Feldman, Nikos Pitsianis
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Publication number: 20050038936Abstract: Techniques for providing improved data distribution to and collection from multiple memories are described. Such memories are often associated with and local to processing elements (PEs) within an array processor. Improved data transfer control within a data processing system provides support for radix 2, 4 and 8 fast Fourier transform (FFT) algorithms through data reordering or bit-reversed addressing across multiple PEs, carried out concurrently with FFT computation on a digital signal processor (DSP) array by a DMA unit. Parallel data distribution and collection through forms of multicast and packet-gather operations are also supported.Type: ApplicationFiled: September 21, 2004Publication date: February 17, 2005Applicant: PTS CorporationInventors: Edwin Barry, Nikos Pitsianis, Kevin Coopman