Patents by Inventor Ajit Ninan
Ajit Ninan 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: 10440379Abstract: Techniques for high dynamic range image processing are presented. Base layer data, first checksum parameter, and residual ratio data for a high dynamic range (HDR) image are each received. A second checksum parameter is computed for the base layer data based upon the first SOF after the last APP11 marker segment and includes all following bytes up to and including the EOI marker. The first and second checksum parameters are compared to determine if base layer has been altered.Type: GrantFiled: January 6, 2015Date of Patent: October 8, 2019Assignee: Dolby Laboratories Licensing CorporationInventor: Ajit Ninan
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Publication number: 20190278137Abstract: Techniques for driving a dual modulation display include generating backlight drive signals to drive individually-controllable illumination sources. The illumination sources emit first light onto a light conversion layer. The light conversion layer converts the first light, such as blue or ultraviolet light, into second light, such as white light. The light conversion layer can include quantum dot materials. Liquid crystal display (LCD) modulation drive signals are generated to determine transmission of the second light through individual color subpixels of the display. These LCD modulation drive signals can be adjusted based on one or more light field simulations to account for non-uniform, spatial color shifts. Alternatively, one or more light field simulations based on a uniformity assumption determine intermediate LCD modulation drive signals. A compensation field simulation, using backlight drive signals, is then used to adjust the intermediate LCD modulation drive signal for color correction.Type: ApplicationFiled: May 17, 2019Publication date: September 12, 2019Applicant: DOLBY LABORATORIES LICENSING CORPORATIONInventors: Chun Chi WAN, Ajit NINAN
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Patent number: 10371884Abstract: Techniques are provided for a high dynamic range panel that includes an array of light sources (202,203) illuminating a corresponding array of light guides (204, 206). A light source (202) of the array illuminates a first light guide (204). The light source directly underlies, such as in a cavity (208), a second light guide (206) that is adjacent to the first light guide. The light source (202) does not extend below a bottom side (214) of either the first light guide or the second light guide to reduce thickness of the panel. The light source (202) and the first light guide (204) can be integrated as a tile assembly. Alternatively, the light source (202) and the second light guide (206) can be an integrated tile assembly. In a specific embodiment, the light source emits a blue or ultraviolet light, which is converted by quantum dots to a different color.Type: GrantFiled: August 3, 2015Date of Patent: August 6, 2019Assignee: Dolby Laboratories Licensing CorporationInventors: Ajit Ninan, Robin Atkins
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Patent number: 10373569Abstract: A first and a second light valve control values are derived for a first and a second frames, respectively, in a specific region of a display panel based on image data of the first and second frames. It is determined whether a difference between the first and second light valve control values exceeds a light valve control threshold. If so, a light source driving waveform is constructed to comprise a sequence of light source control pulses for controlling one or more light sources designated to illuminate the specific region of the display panel. The sequence of light source control pulses is constrained to start at a start time plus a transition time interval. The transition time interval allows light valves in the specific region of the display panel to complete a transition between the first and second light valve control values.Type: GrantFiled: December 1, 2016Date of Patent: August 6, 2019Assignee: Dolby Laboratories Licensing CorporationInventors: Ajit Ninan, Chun Chi Wan
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Publication number: 20190222844Abstract: Techniques are provided to encode and decode image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values. In an example embodiment, luminance ratio values and residual values in color channels of a color space are generated on an individual pixel basis based on a high dynamic range (HDR) image and a derivative tone-mapped (TM) image that comprises one or more color alterations that would not be recoverable from the TM image with a luminance ratio image. The TM image with HDR reconstruction data derived from the luminance ratio values and the color-channel residual values may be outputted in an image file to a downstream device, for example, for decoding, rendering, and/or storing. The image file may be decoded to generate a restored HDR image free of the color alterations.Type: ApplicationFiled: March 25, 2019Publication date: July 18, 2019Applicant: Dolby Laboratories Licensing CorporationInventors: Wenhui JIA, Ajit NINAN, Arkady TEN, Gregory John WARD
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Publication number: 20190213966Abstract: A non-uniform illumination pattern is determined with a display panel of a display device. The non-uniform illumination pattern comprises different values of the one or more illumination properties in first and second spatial regions of the display panel. An illumination compensation pattern is generated based at least in part on the non-uniform illumination pattern. The illumination compensation pattern is configured to homogenize values of the illumination properties in a plurality of spatial regions of the display panel that include the first and second spatial regions, and implemented in the display device.Type: ApplicationFiled: March 13, 2019Publication date: July 11, 2019Applicant: DOLBY LABORATORIES LICENSING CORPORATIONInventors: Ajit NINAN, Chun Chi WAN
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Publication number: 20190172216Abstract: While a viewer is viewing a first stereoscopic image comprising a first left image and a first right image, a left vergence angle of a left eye of a viewer and a right vergence angle of a right eye of the viewer are determined. A virtual object depth is determined based at least in part on (i) the left vergence angle of the left eye of the viewer and (ii) the right vergence angle of the right eye of the viewer. A second stereoscopic image comprising a second left image and a second right image for the viewer is rendered on one or more image displays. The second stereoscopic image is subsequent to the first stereoscopic image. The second stereoscopic image is projected from the one or more image displays to a virtual object plane at the virtual object depth.Type: ApplicationFiled: August 3, 2017Publication date: June 6, 2019Applicant: Dolby Laboratories Licensing CorporationInventors: Ajit NINAN, Chun Chi WAN
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Publication number: 20190174125Abstract: Based on viewing tracking data, a viewer's view direction to a three-dimensional (3D) scene depicted by a first video image is determined. The first video image has been streamed in a video stream to the streaming client device before the first time point and rendered with the streaming client device to the viewer at the first time point. Based on the viewer's view direction, a target view portion is identified in a second video image to be streamed in the video stream to the streaming client device to be rendered at a second time point subsequent to the first time point. The target view portion is encoded into the video stream with a higher target spatiotemporal resolution than that used to encode remaining non-target view portions in the second video image.Type: ApplicationFiled: December 4, 2018Publication date: June 6, 2019Applicant: Dolby Laboratories Licensing CorporationInventor: Ajit Ninan
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Patent number: 10295863Abstract: Techniques for driving a dual modulation display include generating backlight drive signals to drive individually-controllable illumination sources. The illumination sources emit first light onto a light conversion layer. The light conversion layer converts the first light, such as blue or ultraviolet light, into second light, such as white light. The light conversion layer can include quantum dot materials. Liquid crystal display (LCD) modulation drive signals are generated to determine transmission of the second light through individual color subpixels of the display. These LCD modulation drive signals can be adjusted based on one or more light field simulations to account for non-uniform, spatial color shifts. Alternatively, one or more light field simulations based on a uniformity assumption determine intermediate LCD modulation drive signals. A compensation field simulation, using backlight drive signals, is then used to adjust the intermediate LCD modulation drive signal for color correction.Type: GrantFiled: October 24, 2018Date of Patent: May 21, 2019Assignee: Dolby Laboratories Licensing CorporationInventors: Chun Chi Wan, Ajit Ninan
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Publication number: 20190139296Abstract: A target view to a 3D scene depicted by a multiview image is determined. The multiview image comprising sampled views at sampled view positions distributed throughout a viewing volume. Each sampled view in the sampled views comprises a wide-field-of-view (WFOV) image and a WFOV depth map as seen from a respective sampled view position in the sampled view positions. The target view is used to select, from the sampled views, a set of sampled views. A display image is caused to be rendered on a display of a wearable device. The display image is generated based on a WFOV image and a WFOV depth map for each sampled view in the set of sampled views.Type: ApplicationFiled: November 2, 2018Publication date: May 9, 2019Applicant: Dolby Laboratories Licensing CorporationInventors: Haricharan LAKSHMAN, Ajit NINAN
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Patent number: 10262603Abstract: A non-uniform illumination pattern is determined with a display panel of a display device. The non-uniform illumination pattern comprises different values of the one or more illumination properties in first and second spatial regions of the display panel. An illumination compensation pattern is generated based at least in part on the non-uniform illumination pattern. The illumination compensation pattern is configured to homogenize values of the illumination properties in a plurality of spatial regions of the display panel that include the first and second spatial regions, and implemented in the display device.Type: GrantFiled: March 19, 2015Date of Patent: April 16, 2019Assignee: Dolby Laboratories Licensing CorporationInventors: Ajit Ninan, Chun Chi Wan
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Patent number: 10264259Abstract: Techniques are provided to encode and decode image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values. In an example embodiment, luminance ratio values and residual values in color channels of a color space are generated on an individual pixel basis based on a high dynamic range (HDR) image and a derivative tone-mapped (TM) image that comprises one or more color alterations that would not be recoverable from the TM image with a luminance ratio image. The TM image with HDR reconstruction data derived from the luminance ratio values and the color-channel residual values may be outputted in an image file to a downstream device, for example, for decoding, rendering, and/or storing. The image file may be decoded to generate a restored HDR image free of the color alterations.Type: GrantFiled: June 18, 2018Date of Patent: April 16, 2019Assignee: Dolby Laboratories Licensing CorporationInventors: Wenhui Jia, Ajit Ninan, Arkady Ten, Gregory John Ward
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Publication number: 20190079302Abstract: A wearable device for augmented media content experiences can be formed with a mountable physical structure that has removably mountable positions and component devices that are removably mounted through the removably mountable positions. The component devices can be specifically selected based on a specific type of content consumption environment in which the wearable device is to operate. The mountable physical structure may be subject to a device washing process to which the component devices are not subject to, after the wearable device including the mountable physical structure and the component devices is used by a viewer in a content consumption session in the specific type of content consumption environment, so long as the component devices are subsequently removed from the mountable physical structure.Type: ApplicationFiled: September 6, 2018Publication date: March 14, 2019Applicant: Dolby Laboratories Licensing CorporationInventors: Ajit Ninan, Neil Mammen
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Publication number: 20190064597Abstract: Techniques for driving a dual modulation display include generating backlight drive signals to drive individually-controllable illumination sources. The illumination sources emit first light onto a light conversion layer. The light conversion layer converts the first light, such as blue or ultraviolet light, into second light, such as white light. The light conversion layer can include quantum dot materials. Liquid crystal display (LCD) modulation drive signals are generated to determine transmission of the second light through individual color subpixels of the display. These LCD modulation drive signals can be adjusted based on one or more light field simulations to account for non-uniform, spatial color shifts. Alternatively, one or more light field simulations based on a uniformity assumption determine intermediate LCD modulation drive signals. A compensation field simulation, using backlight drive signals, is then used to adjust the intermediate LCD modulation drive signal for color correction.Type: ApplicationFiled: October 24, 2018Publication date: February 28, 2019Applicant: Dolby Laboratories Licensing CorporationInventors: Chun Chi WAN, Ajit NINAN
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Publication number: 20180359489Abstract: A target view to a 3D scene depicted by a multiview image is determined. The multiview image comprises multiple sampled views. Each sampled view comprises multiple texture images and multiple depth images in multiple image layers. The target view is used to select, from the multiple sampled views of the multiview image, sampled views. A texture image and a depth image for each sampled view in the selected sampled views are encoded into a multiview video signal to be transmitted to a downstream device.Type: ApplicationFiled: June 7, 2018Publication date: December 13, 2018Applicant: Dolby Laboratories Licensing CorporationInventors: Haricharan LAKSHMAN, Ajit NINAN
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Patent number: 10133120Abstract: Techniques for driving a dual modulation display include generating backlight drive signals to drive individually-controllable illumination sources. The illumination sources emit first light onto a light conversion layer. The light conversion layer converts the first light, such as blue or ultraviolet light, into second light, such as white light. The light conversion layer can include quantum dot materials. Liquid crystal display (LCD) modulation drive signals are generated to determine transmission of the second light through individual color subpixels of the display. These LCD modulation drive signals can be adjusted based on one or more light field simulations to account for non-uniform, spatial color shifts. Alternatively, one or more light field simulations based on a uniformity assumption determine intermediate LCD modulation drive signals. A compensation field simulation, using backlight drive signals, is then used to adjust the intermediate LCD modulation drive signal for color correction.Type: GrantFiled: October 5, 2017Date of Patent: November 20, 2018Assignee: Dolby Laboratories Licensing CorporationInventors: Chun Chi Wan, Ajit Ninan
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Patent number: 10121454Abstract: Displays, display components, image and video processing apparatus and related methods are described. A method for driving local-dimming displays comprises generating control values for driving pixels of a spatial light modulator from one image data component and generating control values for driving backlight elements from a second image data component. The first and second image data components may respectively comprise a tone map and a ratio image. Control values for the spatial light modulator and/or backlight may be obtained using cost effective hardware.Type: GrantFiled: February 17, 2017Date of Patent: November 6, 2018Assignee: Dolby Laboratories Licensing CorporationInventors: Ajit Ninan, Wenhui Jia
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Publication number: 20180302623Abstract: Techniques are provided to encode and decode image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values. In an example embodiment, luminance ratio values and residual values in color channels of a color space are generated on an individual pixel basis based on a high dynamic range (HDR) image and a derivative tone-mapped (TM) image that comprises one or more color alterations that would not be recoverable from the TM image with a luminance ratio image. The TM image with HDR reconstruction data derived from the luminance ratio values and the color-channel residual values may be outputted in an image file to a downstream device, for example, for decoding, rendering, and/or storing. The image file may be decoded to generate a restored HDR image free of the color alterations.Type: ApplicationFiled: June 18, 2018Publication date: October 18, 2018Applicant: Dolby Laboratories Licensing CorporationInventors: Wenhui JIA, Ajit NINAN, Arkady TEN, Gregory John WARD
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Publication number: 20180293752Abstract: At a first time point, a first light capturing device at a first spatial location in a three-dimensional (3D) space captures first light rays from light sources located at designated spatial locations on a viewer device in the 3D space. At the first time point, a second light capturing device at a second spatial location in the 3D space captures second light rays from the light sources located at the designated spatial locations on the viewer device in the 3D space. Based on the first light rays captured by the first light capturing device and the second light rays captured by the second light capturing device, at least one of a spatial position and a spatial direction, at the first time point, of the viewer device is determined.Type: ApplicationFiled: April 10, 2018Publication date: October 11, 2018Applicant: Dolby Laboratories Licensing CorporationInventors: Ajit NINAN, Neil MAMMEN
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Publication number: 20180295351Abstract: A wearable device comprises a left view optical stack for a viewer to view left view cinema display images rendered on a cinema display and a right view optical stack for the viewer to view right view cinema display images rendered on the cinema display. The left view cinema display images and the right view cinema display images form stereoscopic cinema images. The wearable device further comprises a left view imager that renders left view device display images, to the viewer, on a device display, and a right view imager that renders right view device display images, to the viewer, on the device display. The left view device display images and the right view device display images form stereoscopic device images complementary to the stereoscopic cinema images.Type: ApplicationFiled: April 4, 2018Publication date: October 11, 2018Applicant: Dolby Laboratories Licensing CorporationInventors: Ajit NINAN, Neil MAMMEN