Patents by Inventor Nelson Liang An Chang

Nelson Liang An Chang 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).

  • Patent number: 9601086
    Abstract: Defining a display region for a projector display. An image of a camera's view of a display region is accessed. The image is displayed on a graphical user interface. The image has a first set of coordinates. The image and a reference canvas that is displayed on said graphical user interface is integrated. The integration comprises overlaying a portion of the reference canvas on the image. The reference canvas has a second set of coordinates. One of the first set of coordinates and the second set of coordinates represents a mesh of movable control points being movable from a first location to a second location on the graphical user interface. The first set of coordinates are mapped to the second set of coordinates, thereby generating a pointwise correspondence mapping between coordinate points of the reference canvas and coordinate points of the image.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: March 21, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Niranjan Damera-Venkata
  • Patent number: 9412164
    Abstract: A reference set of image features is determined from an electronic data file specifying a reference image in a reference coordinate space. Rendering information describing a physical rendering of the reference image is ascertained. Calibration-enabling data is derived from the reference set of the image features and the ascertained rendering information. The calibration-enabling data is provided to calibrate an imaging system. The calibration-enabling data may be stored. The imaging system may capture an image of the physical rendering of the reference image in relation to a capture coordinate space. An extracted set of image features may be extracted from the captured image. Respective ones of the image features in the reference and extracted sets may be matched. The imaging system may be calibrated based on matched ones of the image features and the rendering information.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: August 9, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Suk Hwan Lim, Feng Tang
  • Patent number: 9298070
    Abstract: A projector is associated with a head gear for a first participant of collaboration. The head gear does not obstruct the participant's eyes. The projector is configured to receive an image which was created with respect to a first participant's view point based on a dataset that represents an object. The projector is configured for projecting the received image onto a display surface. The first participant perceives the projected image by receiving at least a portion of diffused light associated with the projected image at the first participant's eye that is closest to the projector.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: March 29, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Nelson Liang An Chang
  • Patent number: 9282335
    Abstract: A method including modifying at least a first pixel value in a first portion of a first image frame to create a first difference between the first pixel value in the first image and a first pixel value in a first portion of a second image frame that, at least in part, represents a first code and providing the first image frame and the second image frame to a display device for display at different times is provided.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: March 8, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Niranjan Damera-Venkata
  • Patent number: 9264695
    Abstract: Embodiments of the present invention disclose a system and method for multi-viewpoint video capture. According to one embodiment, the system includes a camera housing for accommodating both a first multi-imager set and a second multi-imager set, with each multi-imager set including a plurality of optical cameras having different viewpoint directions and configured to produce a source image. Furthermore, each camera in the first multi-imager set and the second multi-imager set include corresponding cameras facing in approximately the same viewpoint direction. The first multi-imager set is positioned laterally adjacent to the second multi-imager set such that lines joining a center of projection of corresponding cameras in the first multi-imager set and second multi-imager set are approximately parallel.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: February 16, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Henry Harlyn Baker, Henry Sang, Jr., Nelson Liang An Chang
  • Patent number: 9094570
    Abstract: A system for providing a two-way interactive 3D experience includes a first video capture system configured to capture a first set of images of a first person in a first location, and a first display system in the first location. A second video capture system is configured to capture a second set of images of a second person in a second location. A second display system is in the second location. A two-way communication link is configured to deliver the first set of images to the second display system for display and deliver the second set of images to the first display system for display. The second display system is configured to generate a substantially life-sized 3D display of the first person based on the first set of images.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: July 28, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Bradley Wittke, Nelson Liang An Chang, Henry Sang, Jr.
  • Patent number: 9052575
    Abstract: A method performed by a display system is provided. The method includes projecting a first infrared pattern from a first projection plane of a first projector into a scene, capturing the first infrared pattern from the scene in a capture plane of at least one image capture device, and determining a first correspondence mapping between the first projector and the image capture device from at least the first infrared pattern in the first projection plane and the first infrared pattern in the capture plane.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: June 9, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Niranjan Damera-Venkata, Simon Widdowson
  • Patent number: 8982184
    Abstract: A method for compensating for cross-talk in a 3-D projector-camera system having a controller including a processor and system memory and at least two channels, includes the steps of calibrating the projector-camera system, computing cross-talk factors applicable to the projector-camera system, and correcting new image data for cross-talk based upon the computed cross-talk factors. The system is calibrated by sequentially projecting and capturing, with a camera, a calibration image for each channel, to capture cross-talk between the channels. The controller can compute the cross-talk factors based upon the captured calibration images.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: March 17, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Niranjan Damera-Venkata, Nelson Liang An Chang
  • Patent number: 8944612
    Abstract: A method for automatic delivery of consistent imagery in a multi-projector system includes the steps of dividing the projectors into a plurality of sub-groups of projectors, each projector oriented to project a sub-frame to a sub-group display location, and adjusting the output of each projector in each sub-group to provide selected target display characteristics across all sub-groups.
    Type: Grant
    Filed: February 11, 2009
    Date of Patent: February 3, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Niranjan Damera-Venkata, Arun Kumar Paruchuri
  • Publication number: 20140192170
    Abstract: A method for reducing cross-talk in a 3D display is disclosed. The cross-talk in the 3D display is characterized with a plurality of test signals to generate a forward transformation model. Input image signals are applied to the forward transformation model to generate modeled signals. The modeled signals are applied to a visual model to generate a visual measure. The input signals are modified based on the visual measure.
    Type: Application
    Filed: August 25, 2011
    Publication date: July 10, 2014
    Inventors: Ramin Samadani, Nelson Liang An Chang
  • Patent number: 8736547
    Abstract: A method and system for interfacing a digital device with an interactive display surface (IDS) is presented. The IDS detects the digital device when it is brought into proximity, and attempts to identify the device. The IDS communicates with the device, and displays interactive representations of information stored on the device.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: May 27, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Patrick M. Goddi, Nelson Liang An Chang, I-Jong Lin, Joshua Tyler, Andrew Dahley
  • Publication number: 20140132736
    Abstract: Image capturing systems are disclosed. In one aspect, an image capturing system includes an image capture device and at least two light-deflecting devices associated with the image capture device. The image capture device is capable of capturing different perspective views of objects in a scene. The at least two light-deflecting devices are positioned between the image capture device and the scene. The at least two light-deflecting devices are capable of being oriented in at least two different orientations to re-direct the path of light rays from the objects in the scene to the associated image capture device, enabling the capture of successive perspective views of the scene.
    Type: Application
    Filed: March 30, 2011
    Publication date: May 15, 2014
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Nelson Liang An Chang, Huei Pei Kuo, Alexandre M Bratkovski
  • Patent number: 8687068
    Abstract: A pattern includes a spatial configuration of color codes. Each color code is a unique configuration of colors selected from a number of basis colors. The color codes each include the same number of colors.
    Type: Grant
    Filed: September 19, 2010
    Date of Patent: April 1, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Suk Hwan Lim
  • Publication number: 20130286154
    Abstract: A system for providing a two-way interactive 3D experience includes a first video capture system configured to capture a first set of images of a first person in a first location, and a first display system in the first location. A second video capture system is configured to capture a second set of images of a second person in a second location. A second display system is in the second location. A two-way communication link is configured to deliver the first set of images to the second display system for display and deliver the second set of images to the first display system for display. The second display system is configured to generate a substantially life-sized 3D display of the first person based on the first set of images.
    Type: Application
    Filed: April 30, 2012
    Publication date: October 31, 2013
    Inventors: Bradley Wittke, Nelson Liang An Chang, Henry Sang, JR.
  • Patent number: 8548237
    Abstract: A local image patch identified in an image is divided into respective sub-patches of respective image forming elements. For each of the respective image forming elements in the local image patch, a respective ordinal rank of the image forming element is determined, and respective contributions of the image forming element to a particular one of the respective sub-patches containing the image forming element and to one or more other ones of the respective sub-patches neighboring the particular sub-patch are ascertained. Each ordinal rank corresponds to a respective dimension of an ordinal rank feature space. For each of the respective sub-patches of the local image patch, a respective histogram of ascertained contributions of the image forming elements in the ordinal rank feature space is built. A respective feature vector representing the local image patch is generated from the respective histograms built for the sub-patches of the local image.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: October 1, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Feng Tang, Suk Hwan Lim, Nelson Liang An Chang
  • Patent number: 8538814
    Abstract: A system for providing advertising content includes a public display; a database configured to store the advertising content; and a central processing element configured to dynamically interact with participants in an activity and present the advertising content in connection with information about the activity on the public display. A method of providing advertising content includes conducting an activity involving participants; receiving input regarding the participants engaged in the activity; and displaying advertising content from a database concurrently with information regarding the activity.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: September 17, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Niranjan Damera-Venkata
  • Publication number: 20130222557
    Abstract: Image viewing systems are disclosed. In one aspect, an image viewing system includes a screen (108, 208, 302, 402, 502, 602, 808) and a projection system (304) that includes at least one video projector (310, 410, 510, 610, 810), and at least two mirrors (311, 411, 511, 611, 811) associated with each video projector (310, 410, 510, 610, 810). The projection system (304) projects different perspective views of images onto the screen (108, 208, 302, 402, 502, 602, 808). The at least two mirrors are oriented in at least two different orientations to redirect the path of light rays from the associated video projector (310, 410, 510, 610, 810) to the screen (108, 208, 302, 402, 502, 602, 808), enabling a viewer looking at the screen (108, 208, 302, 402, 502, 602, 808) to view successive views of each image.
    Type: Application
    Filed: November 1, 2010
    Publication date: August 29, 2013
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Huei Pei Kuo, Alexandre M. Bratkovski, Nelson Liang An Chang
  • Patent number: 8477241
    Abstract: A method for reducing view-dependent artifacts in a multi-projector system includes the steps of measuring, from multiple viewpoints, projection characteristics of an image projected by a multi-projector system, estimating view-dependent projection parameters that can reduce view-dependent artifacts, and computing rendering parameters for each projector so as to reduce the view-dependent artifacts.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: July 2, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Nelson Liang An Chang, Niranjan Damera-Venkata
  • Publication number: 20130044181
    Abstract: Embodiments of the present invention disclose a system and method for multi-viewpoint video capture. According to one embodiment, the system includes a camera housing for accommodating both a first multi-imager set and a second multi-imager set, with each multi-imager set including a plurality of optical cameras having different viewpoint directions and configured to produce a source image. Furthermore, each camera in the first multi-imager set and the second multi-imager set include corresponding cameras facing in approximately the same viewpoint direction. The first multi-imager set is positioned laterally adjacent to the second multi-imager set such that lines joining a center of projection of corresponding cameras in the first multi-imager set and second multi-imager set are approximately parallel.
    Type: Application
    Filed: May 14, 2010
    Publication date: February 21, 2013
    Inventors: Henry Harlyn Baker, Henry Sang, JR., Nelson Liang An Chang
  • Publication number: 20130038729
    Abstract: A projector is associated with a head gear for a first participant of collaboration. The head gear does not obstruct the participant's eyes. The projector is configured to receive an image which was created with respect to a first participant's view point based on a dataset that represents an object. The projector is configured for projecting the received image onto a display surface. The first participant perceives the projected image by receiving at least a portion of diffused light associated with the projected image at the first participant's eye that is closest to the projector.
    Type: Application
    Filed: April 29, 2010
    Publication date: February 14, 2013
    Inventor: Nelson Liang An Chang