Patents by Inventor Ashok Veeraraghavan
Ashok Veeraraghavan 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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Publication number: 20230410341Abstract: A method for a passive single-viewpoint 3D imaging system comprises capturing an image from a camera having one or more phase masks. The method further includes using a reconstruction algorithm, for estimation of a 3D or depth image.Type: ApplicationFiled: April 26, 2023Publication date: December 21, 2023Applicants: William Marsh Rice University, Carnegie Mellon UniversityInventors: Yicheng Wu, Vivek Boominathan, Huaijin Chen, Aswin C. Sankaranarayanan, Ashok Veeraraghavan
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Publication number: 20230233085Abstract: A system for imaging a target embedded in a scattering media includes: one or more light sources that are pulsed lights at one or more wavelengths in a range of visible to near-infrared; a detector, including a photodetector array with a time-gating function, configured to collect a scattered light after a gate start time; and a processor configured to determine an image of the target based on the scattered light.Type: ApplicationFiled: January 27, 2023Publication date: July 27, 2023Applicant: William Marsh Rice UniversityInventors: Yongyi Zhao, Ankit Raghuram, Ashok Veeraraghavan, Jacob Robinson
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Patent number: 11676294Abstract: A method for a passive single-viewpoint 3D imaging system comprises capturing an image from a camera having one or more phase masks. The method further includes using a reconstruction algorithm, for estimation of a 3D or depth image.Type: GrantFiled: May 1, 2020Date of Patent: June 13, 2023Assignees: William Marsh Rice University, Carnegie Mellon UniversityInventors: Yicheng Wu, Vivek Boominathan, Huaijin Chen, Aswin C. Sankaranarayanan, Ashok Veeraraghavan
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Patent number: 11259710Abstract: A remote photoplethysmography (RPPG) system includes an input interface to receive a sequence of measurements of intensities of different regions of a skin of a person indicative of vital signs of the person; a solver to solve an optimization problem to determine frequency coefficients of photoplethysmographic waveforms corresponding to the measured intensities at the different regions, wherein the solver determines the frequency coefficients to reduce a distance between intensities of the skin reconstructed from the frequency coefficients and the corresponding measured intensities of the skin while enforcing joint sparsity on the frequency coefficients; and an estimator to estimate the vital signs of the person from the determined frequency coefficients of photoplethysmographic waveforms.Type: GrantFiled: October 23, 2018Date of Patent: March 1, 2022Assignee: Mitsubishi Electric Research Laboratories, Inc.Inventors: Hassan Mansour, Tim Marks, Ewa Nowara, Yudai Nakamura, Ashok Veeraraghavan
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Patent number: 11178349Abstract: A lens-free imaging system for generating an image of a scene includes an electromagnetic (EM) radiation sensor; a mask disposed between the EM radiation sensor and the scene; an image processor that obtains signals from the EM radiation sensor while the EM radiation sensor is exposed to the scene; and estimates the image of the scene based on, at least in part, the signals and a transfer function between the scene and the EM radiation sensor.Type: GrantFiled: January 29, 2016Date of Patent: November 16, 2021Assignee: William Marsh Rice UniversityInventors: Aswin Sankaranarayanan, Ashok Veeraraghavan, Lisa A. Hendricks, Richard Baraniuk, Ali Ayremlou, M. Salman Asif
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Patent number: 10970590Abstract: Methods and apparatus are presented herein for detecting an oilfield equipment unit of an oilfield wellsite from a visible image, overlaying the detected oilfield equipment unit of the visible image on a corresponding portion of a thermal image, and generating an alert when a temperature indicated by the corresponding portion of the thermal image is outside of an operational temperature range of the detected oilfield equipment unit. The methods and apparatus presented herein facilitate the monitoring of the health of oilfield equipment units that would otherwise be monitored by numerous sensors disposed about the oilfield wellsite.Type: GrantFiled: June 6, 2016Date of Patent: April 6, 2021Assignee: Schlumberger Technology CorporationInventors: Rajesh Luharuka, Ashok Veeraraghavan
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Publication number: 20200351454Abstract: A system for a wavefront imaging sensor with high resolution (WISH) comprises a spatial light modulator (SLM), a plurality of image sensors and a processor. The system further includes the SLM and a computational post-processing algorithm for recovering an incident wavefront with a high spatial resolution and a fine phase estimation. In addition, the image sensors work both in a visible electromagnetic (EM) spectrum and outside the visible EM spectrum.Type: ApplicationFiled: April 30, 2020Publication date: November 5, 2020Applicant: William Marsh Rice UniversityInventors: Yicheng Wu, Manoj Kumar Sharma, Ashok Veeraraghavan
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Publication number: 20200349729Abstract: A method for a passive single-viewpoint 3D imaging system comprises capturing an image from a camera having one or more phase masks. The method further includes using a reconstruction algorithm, for estimation of a 3D or depth image.Type: ApplicationFiled: May 1, 2020Publication date: November 5, 2020Applicants: William Marsh Rice University, Carnegie Mellon UniversityInventors: Yicheng Wu, Vivek Boominathan, Hauijin Chen, Aswin C. Sankaranarayanan, Ashok Veeraraghavan
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Patent number: 10753869Abstract: In one aspect, embodiments disclosed herein relate to a lens-free imaging system. The lens-free imaging system includes: an image sampler, a radiation source, a mask disposed between the image sampler and a scene, and an image sampler processor. The image sampler processor obtains signals from the image sampler that is exposed, through the mask, to radiation scattered by the scene which is illuminated by the radiation source. The image sampler processor then estimates an image of the scene based on the signals from the image sampler, processed using a transfer function that relates the signals and the scene.Type: GrantFiled: July 28, 2017Date of Patent: August 25, 2020Assignee: William Marsh Rice UniversityInventors: Ashok Veeraraghavan, Richard Baraniuk, Jacob Robinson, Vivek Boominathan, Jesse Adams, Benjamin Avants
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Patent number: 10694123Abstract: A method for imaging objects includes illuminating an object with a light source of an imaging device, and receiving an illumination field reflected by the object. An aperture field that intercepts a pupil of the imaging device is an optical propagation of the illumination field at an aperture plane. The method includes receiving a portion of the aperture field onto a camera sensor, and receiving a sensor field of optical intensity. The method also includes iteratively centering the camera focus along the Fourier plane at different locations to produce a series of sensor fields and stitching together the sensor fields in the Fourier domain to generate an image. The method also includes determining a plurality of phase information for each sensor field in the series of sensor fields, applying the plurality of phase information to the image, receiving a plurality of illumination fields reflected by the object, and denoising the intensity of plurality of illumination fields using Fourier ptychography.Type: GrantFiled: July 14, 2018Date of Patent: June 23, 2020Assignees: Northwestern University, William Marsh Rice UniversityInventors: Oliver Strider Cossairt, Jason Holloway, Ashok Veeraraghavan, Manoj Kumar Sharma, Yicheng Wu
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Publication number: 20200150266Abstract: A method for imaging objects includes illuminating an object with a light source of an imaging device, and receiving an illumination field reflected by the object. An aperture field that intercepts a pupil of the imaging device is an optical propagation of the illumination field at an aperture plane. The method includes receiving a portion of the aperture field onto a camera sensor, and receiving a sensor field of optical intensity. The method also includes iteratively centering the camera focus along the Fourier plane at different locations to produce a series of sensor fields and stitching together the sensor fields in the Fourier domain to generate an image. The method also includes determining a plurality of phase information for each sensor field in the series of sensor fields, applying the plurality of phase information to the image, receiving a plurality of illumination fields reflected by the object, and denoising the intensity of plurality of illumination fields using Fourier ptychography.Type: ApplicationFiled: July 14, 2018Publication date: May 14, 2020Inventors: Oliver Cossairt, Jason Holloway, Ashok Veeraraghavan, Manoj Kumar Sharma, Yicheng Wu
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Publication number: 20190350471Abstract: A remote photoplethysmography (RPPG) system includes an input interface to receive a sequence of measurements of intensities of different regions of a skin of a person indicative of vital signs of the person; a solver to solve an optimization problem to determine frequency coefficients of photoplethysmographic waveforms corresponding to the measured intensities at the different regions, wherein the solver determines the frequency coefficients to reduce a distance between intensities of the skin reconstructed from the frequency coefficients and the corresponding measured intensities of the skin while enforcing joint sparsity on the frequency coefficients; and an estimator to estimate the vital signs of the person from the determined frequency coefficients of photoplethysmographic waveforms.Type: ApplicationFiled: October 23, 2018Publication date: November 21, 2019Inventors: Tim Marks, Hassan Mansour, Ewa Nowara, Yudai Nakamura, Ashok Veeraraghavan
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Publication number: 20190175029Abstract: In one aspect, embodiments disclosed herein relate to multi-sensor imaging systems for measuring a pulsatile blood perfusion map and methods of use, including: one or more high accuracy blood flow sensors that generate a reference blood volume waveform; one or more low accuracy blood flow sensors that generate a second blood volume waveform; and a controller connected to the high accuracy blood flow sensor and the one or more low accuracy blood flow sensors by at least one operable connection, wherein the controller is configured to generate the pulsatile blood perfusion map by analyzing the reference blood volume waveform and the second blood volume waveform.Type: ApplicationFiled: May 12, 2017Publication date: June 13, 2019Inventors: Mayank KUMAR, Ashok VEERARAGHAVAN, Ashutosh SABHARWAL
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Publication number: 20190178796Abstract: In one aspect, embodiments disclosed herein relate to a lens-free imaging system. The lens-free imaging system includes: an image sampler, a radiation source, a mask disposed between the image sampler and a scene, and an image sampler processor. The image sampler processor obtains signals from the image sampler that is exposed, through the mask, to radiation scattered by the scene which is illuminated by the radiation source. The image sampler processor then estimates an image of the scene based on the signals from the image sampler, processed using a transfer function that relates the signals and the scene.Type: ApplicationFiled: July 28, 2017Publication date: June 13, 2019Applicant: William Marsh Rice UniversityInventors: Ashok Veeraraghavan, Richard Baraniuk, Jacob Robinson, Vivek Boominathan, Jesse Adams, Benjamin Avants
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Patent number: 10230874Abstract: An imaging device includes: a control unit configured to control an output of an irradiation signal including an irradiation code used for control of a pattern of emission of irradiation light and an output of a reference signal including a reference code indicating a pattern used for detection of a correlation with reception light including reflection light of the irradiation light; and an imaging element configured to output a pixel signal indicating a correlation between the reception light and the reference signal, wherein one of the irradiation code and the reference code is a code in which weighted adding of a plurality of unit codes, in which a phase of a basic code having an impulse cross-correlation with the other code is shifted for a different shift amount, is performed.Type: GrantFiled: April 20, 2016Date of Patent: March 12, 2019Assignee: Sony CorporationInventors: Ryuichi Tadano, Adithya Pediredla, Ashok Veeraraghavan
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Publication number: 20180181830Abstract: Methods and apparatus for detecting an equipment unit of a wellsite from a visible image, overlaying the detected equipment unit of the visible image on a corresponding portion of a thermal image, and generating an alert when a temperature indicated by the corresponding portion of the thermal image is outside of an operational temperature range of the detected equipment unit.Type: ApplicationFiled: June 6, 2016Publication date: June 28, 2018Inventors: Rajesh LUHARUKA, Ashok VEERARAGHAVAN
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Patent number: 9936880Abstract: A system for estimating a photoplethysmogram waveform of a target includes an image processor configured to obtain images of the target and a waveform analyzer. The waveform analyzer is configured to determine a weight of a portion of the target. The weight is based on a time variation of a light reflectivity of the portion of the target. The time variation of the light reflectivity of the target is based on the images. The waveform analyzer is further configured to estimate a PPG waveform of the target based on the weight of the portion and the time variation of the light reflectivity of the portion.Type: GrantFiled: November 25, 2015Date of Patent: April 10, 2018Assignee: William Marsh Rice UniversityInventors: Mayank Kumar, Ashok Veeraraghavan, Ashutosh Sabharwal
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Publication number: 20180027201Abstract: A lens-free imaging system for generating an image of a scene includes an electromagnetic (EM) radiation sensor; a mask disposed between the EM radiation sensor and the scene; an image processor that obtains signals from the EM radiation sensor while the EM radiation sensor is exposed to the scene; and estimates the image of the scene based on, at least in part, the signals and a transfer function between the scene and the EM radiation sensor.Type: ApplicationFiled: January 29, 2016Publication date: January 25, 2018Applicant: William Marsh Rice UniversityInventors: Aswin Sankaranarayanan, Ashok Veeraraghavan, Lisa A. Hendricks, Richard Baraniuk, Ali Ayremlou, M. Salman Asif
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Publication number: 20160316112Abstract: An image or a range image in a range at an arbitrary distance is acquired. An imaging device includes: a control unit configured to control an output of an irradiation signal including an irradiation code used for control of a pattern of emission of irradiation light and an output of a reference signal including a reference code indicating a pattern used for detection of a correlation with reception light including reflection light of the irradiation light; and an imaging element configured to output a pixel signal indicating a correlation between the reception light and the reference signal, wherein one of the irradiation code and the reference code is a code in which weighted adding of a plurality of unit codes, in which a phase of a basic code having an impulse cross-correlation with the other code is shifted for a different shift amount, is performed. The present technology can be applied, for example, to a camera that photographs a range image.Type: ApplicationFiled: April 20, 2016Publication date: October 27, 2016Applicants: Sony Corporation, William Marsh Rice UniversityInventors: Ryuichi Tadano, Adithya Pediredla, Ashok Veeraraghavan
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Patent number: 9420201Abstract: Provided is an image processing apparatus including an image generation unit that, from photographic images that are captured using multiple photographic parameters, generates an image of which values of the multiple photographic parameters are different from values of the photographic image.Type: GrantFiled: January 12, 2015Date of Patent: August 16, 2016Assignees: SONY CORPORATION, WILLIAM MARSH RICE UNIVERSITYInventors: Atsushi Ito, Ashok Veeraraghavan, Kaushik Mitra, Salil Tambe