Patents by Inventor Rajeev Ramanath
Rajeev Ramanath 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: 11163155Abstract: Eyewear including a support structure defining a region for receiving a head of a user. The support structure supports optical elements, electronic components, and a use detector. The use detector is coupled to the electronic components and is positioned to identify when the head of the user is within the region defined by the support structure. The electronic components monitor the use detector and transition from a first mode of operation to a second mode of operation when the use detector senses the head of the user in the region.Type: GrantFiled: December 11, 2018Date of Patent: November 2, 2021Assignee: Snap Inc.Inventors: Julio Cesar Castañeda, Rajeev Ramanath
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Patent number: 11137620Abstract: In an example, the eyewear includes an optical element, electronic components, and a support structure configured to support the optical element and the electronic components. The support structure defines a region for receiving at least a portion of a head of a user. The eyewear also includes a biometric sensor coupled to the electronic components and supported by the support structure. The biometric sensor is attached to the support structure and positioned to detect, in the region, a biometric signal representative of a biometric of the user for processing by the electronic components.Type: GrantFiled: January 31, 2019Date of Patent: October 5, 2021Assignee: Snap Inc.Inventors: Julio Cesar Castañeda, Rajeev Ramanath
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Patent number: 11138301Abstract: A system comprises an eyewear device that includes a frame, a temple connected to a lateral side of the frame, an infrared emitter, and an infrared camera. The infrared emitter and the infrared camera are connected to the frame or the temple to emit a pattern of infrared light. The system includes a processor coupled to the eyewear device, a memory accessible to the processor, and programming in the memory. Execution of the programming by the processor configures the system to perform functions, including functions to emit, via the infrared emitter, a pattern of infrared light on an eye of a user of the eyewear device; capture, via the camera, reflection variations in the pattern of infrared light on the eye of the user; and identify a user of the eyewear device based on the reflection variations of the emitted pattern of infrared light on the eye of the user.Type: GrantFiled: November 13, 2018Date of Patent: October 5, 2021Assignee: Snap Inc.Inventors: Julio Cesar Castañeda, Rajeev Ramanath
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Patent number: 11092998Abstract: A system comprises an eyewear device that includes a frame, a temple connected to a lateral side of the frame, a fingerprint sensor, and a sensing circuit. The fingerprint sensor includes an input surface to receive input of a finger skin surface. The sensing circuit is configured to track a pattern of fingerprint ridges of the finger skin surface on the input surface. Execution of programming by a processor configures the system to perform functions to track, via the sensing circuit, the pattern of fingerprint ridges of the finger skin surface on the input surface; generate a fingerprint image having the tracked pattern of fingerprint ridges; extract fingerprint features from the fingerprint image; and authorize the user to utilize the eyewear device based on the extracted fingerprint features.Type: GrantFiled: January 8, 2019Date of Patent: August 17, 2021Assignee: Snap Inc.Inventors: Julio Cesar Castañeda, Rajeev Ramanath
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Publication number: 20200204768Abstract: An eyewear device is disclosed including an illumination device including illumination sources, each illumination source including a first illuminator, a second illuminator, and a third illuminator, and a spatial light modulator coupled to the illumination device to control when each of the first, second, and third illuminators are on during an illumination frame. The spatial light modulator is adapted to turn on the first illuminator while the second and third illuminators are off, turn on the second illuminator while the first and third illuminators are off, turn on the third illuminator while the first and second illuminators are off during a third time period of the illumination frame, and turn on the first, second and third illuminators during a fourth time period. An illumination method is also disclosed.Type: ApplicationFiled: December 11, 2019Publication date: June 25, 2020Inventor: RAJEEV RAMANATH
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Publication number: 20190265508Abstract: In an example, the eyewear includes an optical element, electronic components, and a support structure configured to support the optical element and the electronic components. The support structure defines a region for receiving at least a portion of a head of a user. The eyewear also includes a biometric sensor coupled to the electronic components and supported by the support structure. The biometric sensor is attached to the support structure and positioned to detect, in the region, a biometric signal representative of a biometric of the user for processing by the electronic components.Type: ApplicationFiled: January 31, 2019Publication date: August 29, 2019Inventors: Julio Cesar Castañeda, Rajeev Ramanath
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Patent number: 9947275Abstract: A method and apparatus are explained for performing white point color adjustment for a display device. This can be done by obtaining a value of an ambient light sensor, determining whether to make a white point adjustment, and, for a dynamic white point adjustment, using the value from the ambient light sensor in performing white point adjustment toward target color coordinates. A white point might be set equal to the target color coordinates, but might also remain unchanged for small ambient light changes or ambient light outside a region of interest. The white point might be changed to the target color coordinates in multiple steps. Various parameters might be used that can be varied to vary behavior of the white point adjustment.Type: GrantFiled: December 17, 2014Date of Patent: April 17, 2018Assignee: AMAZON TECHNOLOGIES, INC.Inventors: Rajeev Ramanath, Ajay Gowribdanur Ramesh
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Patent number: 9538100Abstract: Systems and methods for receiving image information with spectral components in the visible and near infrared (NIR) spectral ranges and separating the image information in the visible spectral range from the image information in the NIR spectral range is described. The separation of the of the visible and NIR spectral range image information may be performed using a colorimetric calibration matrix. The colorimetric calibration matrix may be determined based at least in part on training image information with a known tristimulus matrix.Type: GrantFiled: May 10, 2013Date of Patent: January 3, 2017Assignee: Amazon Technologies, Inc.Inventor: Rajeev Ramanath
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Patent number: 8542244Abstract: System and method for generating multiprimary signals with optimization for bit depth for use in display devices. A preferred embodiment comprises converting an input color signal into an output color signal, wherein the number of colors in the output color signal is less than a number of colors used in a display system, when a weighting of the input color signal is less than a specified threshold, and converting the input color signal into an output color signal, wherein the number of colors in the output color signal is equal to the number of colors used in the display system, when the weighting of the input color signal is greater than the specified threshold. The use of fewer colors eliminates low bit depth colors, allowing increased dither quality in dimmer images.Type: GrantFiled: November 5, 2012Date of Patent: September 24, 2013Assignee: Texas Instruments IncorporatedInventors: Jeffrey Kempf, Rajeev Ramanath
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Patent number: 8433155Abstract: The noise reduction filter is intensity adaptive and incorporates directional variances of input images.Type: GrantFiled: December 28, 2006Date of Patent: April 30, 2013Assignee: Texas Instruments IncorporatedInventors: Jeffrey Matthew Kempf, Rajeev Ramanath
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Patent number: 8411206Abstract: In one embodiment, an image decoding system for a YCbCr formatted signal includes a color space converter capable of representing an RGB image signal with one or two negative image signal components. The image decoding system further includes a degamma correction unit and an image signal formatter. An offset of the image black level from zero corresponding to the image signal offset produced by the color space converter is employed to perform degamma correction. In a further embodiment, gain, offset, and sign are removed from the image signal produced by the color space converter prior to degamma correction. The image signal formatter may utilize a one-dimensional and a three-dimensional lookup table to produce an image signal that may include secondary and white image components. The system advantageously accommodates decoding xvYCC-encoded image data in conventional as well as new hardware display system architectures.Type: GrantFiled: December 27, 2007Date of Patent: April 2, 2013Assignee: Texas Instruments IncorporatedInventors: Gregory S. Pettitt, Rajeev Ramanath
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Patent number: 8379064Abstract: In display systems employing spatial light modulators, the OFF-state light from OFF-state pixels of the spatial light modulator can be captured and directed back to the pixels of the spatial light modulator so as to recycle the OFF-state light in the display system. Bitplanes derived from the desired image to be produced are calibrated to include the recycled off-state light to properly produce the desired image using the display system.Type: GrantFiled: April 18, 2011Date of Patent: February 19, 2013Assignee: Texas Instruments IncorporatedInventors: Andrew Ian Russell, David Foster Lieb, Rajeev Ramanath
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Patent number: 8305391Abstract: System and method for generating multiprimary signals with optimization for bit depth for use in display devices. A preferred embodiment comprises converting an input color signal into an output color signal, wherein the number of colors in the output color signal is less than a number of colors used in a display system, when a weighting of the input color signal is less than a specified threshold, and converting the input color signal into an output color signal, wherein the number of colors in the output color signal is equal to the number of colors used in the display system, when the weighting of the input color signal is greater than the specified threshold. The use of fewer colors eliminates low bit depth colors, allowing increased dither quality in dimmer images.Type: GrantFiled: November 27, 2006Date of Patent: November 6, 2012Assignee: Texas Instruments IncorporatedInventors: Rajeev Ramanath, Jeffrey Matthew Kempf
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Patent number: 8305395Abstract: In a method embodiment, a method for image processing includes receiving one or more signals indicative of an optical characteristic of one or more respective light beams. A transform is generated based on the received one or more signals. The transform converts a first plurality of image components encoded by a first plurality of colors to a second plurality of image components encoded by a second plurality of colors.Type: GrantFiled: April 30, 2007Date of Patent: November 6, 2012Assignee: Texas Instruments IncorporatedInventors: Rajeev Ramanath, Takeshi Honzawa
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Patent number: 8305666Abstract: System and method for maintaining perceived hue constancy. A method for displaying an image includes receiving a color vector and associated image data, remapping the color vector to maintain a perceived hue constancy by adjusting a hue component of the color vector in response to a change in a lightness component or a chroma component of the color vector, providing the remapped color vector to a light source for display, and displaying image data associated with the color vector. The use of the constant hue curve ensures that the adjusting of the color vector maintains the perceived hue of the color vector, thereby helping to maintain image quality.Type: GrantFiled: February 5, 2011Date of Patent: November 6, 2012Assignee: Texas Instruments IncorporatedInventor: Rajeev Ramanath
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Patent number: 8259125Abstract: Methods for gamut mapping and boosting a color saturation of a color signal having multiple colors and a color value for each color. An example method includes mapping each color from a first to a second color space, adjusting each color in the mapped color signal including boosting a color saturation; determining a maximum color value of the color signal; and, in response to a determining that the maximum color value exceeds a maximum displayable color value, setting the color value of the color having the maximum color value to be equal to the maximum displayable color value and scaling color values of colors not having the maximum color value.Type: GrantFiled: November 22, 2011Date of Patent: September 4, 2012Assignee: Texas Instuments IncorporatedInventors: Rajeev Ramanath, Larry L. Jenkins
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Patent number: 8144321Abstract: According to one embodiment of the present invention, a system for encoding an optical spectrum includes a dispersive element, a digital micromirror device (DMD) array, a detector, and a controller. The dispersive element receives light from a source and disperses the light to yield light components of different wavelengths. The digital micromirror device (DMD) array has micromirrors that modulate the light to encode an optical spectrum of the light. The detector detects the light that has been modulated. The controller generates an intensity versus time waveform representing the optical spectrum of the detected light.Type: GrantFiled: October 22, 2008Date of Patent: March 27, 2012Assignee: Texas Instruments IncorporatedInventors: Walter M. Duncan, James N. Malina, Rajeev Ramanath
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Publication number: 20120062587Abstract: Methods for gamut mapping and boosting a color saturation of a color signal having multiple colors and a color value for each color. An example method includes mapping each color from a first to a second color space, adjusting each color in the mapped color signal including boosting a color saturation; determining a maximum color value of the color signal; and, in response to a determining that the maximum color value exceeds a maximum displayable color value, setting the color value of the color having the maximum color value to be equal to the maximum displayable color value and scaling color values of colors not having the maximum color value.Type: ApplicationFiled: November 22, 2011Publication date: March 15, 2012Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Rajeev Ramanath, Larry Layne Jenkins
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Patent number: 8063911Abstract: A system and method for gamut mapping out-of-gamut signals. A method includes adjusting each color in a color signal, determining a maximum color value of the color signal, in response to a determining that the maximum color value exceeds a maximum displayable color value, scaling color values of colors not having the maximum color value, and setting the color value of the color having the maximum color value to be equal to the maximum displayable color value. The method further includes leaving the color values of the colors in the color signal unchanged in response to a determining that the maximum color value does not exceed the maximum displayable color value. The scaling of color values not equal to the maximum color value results in a maintaining of a proper hue of the color signal, thereby not introducing color artifacts and other forms of color noise.Type: GrantFiled: November 30, 2007Date of Patent: November 22, 2011Assignee: Texas Instruments IncorporatedInventors: Rajeev Ramanath, Larry Layne Jenkins
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Publication number: 20110193894Abstract: In display systems employing spatial light modulators, the OFF-state light from OFF-state pixels of the spatial light modulator can be captured and directed back to the pixels of the spatial light modulator so as to recycle the OFF-state light in the display system. Bitplanes derived from the desired image to be produced are calibrated to include the recycled off-state light to properly produce the desired image using the display system.Type: ApplicationFiled: April 18, 2011Publication date: August 11, 2011Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Andrew Ian Russell, David Foster Lieb, Rajeev Ramanath