Patents by Inventor Ramesh Raskar

Ramesh Raskar 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).

  • Method and system for aligning an array of rear-projectors
    Publication number: 20080007700
    Abstract: A system and method aligns an array of projectors by performing independently a parametric coarse alignment for each projector, and by performing jointly a non-parametric fine alignment for each projector and adjacent projectors. The non-parametric fine alignment can also be performed independently for each projector.
    Type: Application
    Filed: July 10, 2006
    Publication date: January 10, 2008
    Inventors: Jeroen vanBaar, Ramesh Raskar, Jay E. Thornton
  • Method for Separating Direct and Global Illumination in a Scene
    Publication number: 20070285422
    Abstract: A method and apparatus for determine an effect of direct and global illumination in a scene. A scene is illuminated with spatially varying illumination. A set of images is acquired of the scene, and a direct and global radiance in the set of images is determined.
    Type: Application
    Filed: January 17, 2007
    Publication date: December 13, 2007
    Inventors: Shree Nayar, Gurunandan Krishnan, Michael Grossberg, Ramesh Raskar
  • System and method for measuring scene reflectance using optical sensors
    Publication number: 20070268481
    Abstract: A system measures reflectance in a scene. A first optical sensor is configured to measure incident energy at a location in a scene. A second optical sensor is configured to measure reflected energy from the location in the scene. The incident energy and the reflected energy are analyzed to determine a photometric property at the location of the scene.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Ramesh Raskar, Hideaki Nii, Yong Zhao, Paul H. Dietz, Erich Bruns
  • System and method for sensing geometric and photometric attributes of a scene with multiplexed illumination and solid states optical devices
    Publication number: 20070268363
    Abstract: An optical receiver is arranged at a location in a scene. The optical receiver includes a photo sensor configured to detect spatio-temporal modulated optical signals directed at the scene from a set of spatially dispersed optical transmitters, and to convert the optical signals from each of the optical transmitters to a corresponding electronic signal. The electronic signals can be analyzed to determine geometric properties of the location in the scene.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Ramesh Raskar, Hideaki Nii, Jay W. Summet, Yong Zhao, Paul H. Dietz, Jonathan Westhues, Michael Noland, Erich Bruns, Shree Nayar, Vlad Branzoi
  • System and method for sensing geometric and photometric attributes of a scene with multiplexed illumination and solid state optical devices
    Publication number: 20070268366
    Abstract: An optical emitter and an optical sensor are arranged at locations in a scene. A physical mask is arranged between the emitter and sensor to modulate directional electromagnetic signals from the emitter spatially. The modulated signals are analyzed to determine geometric properties at the location in the scene.
    Type: Application
    Filed: July 28, 2006
    Publication date: November 22, 2007
    Inventors: Ramesh Raskar, Hideaki Nii
  • Apparatus and method for illuminating a scene with multiplexed illumination for motion capture
    Publication number: 20070268398
    Abstract: A projector that illuminates a scene with multiplexed light patterns includes a passive physical mask, and a set of spatially dispersed optical emitters arranged behind the physical mask. The optical emitters are modulated to project a set of unique optical light patterns.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Ramesh Raskar, Paul H. Dietz
  • Non-photorealistic camera
    Patent number: 7295720
    Abstract: A camera has a single lens and multiple flash units distributed around the lens. A set of images is acquired of a scene with different controlled lighting applied by the flash units, one at the time. The images are stored in a memory, and then combined to produce a single stylized image of the scene from the acquired images.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: November 13, 2007
    Assignee: Mitsubishi Electric Research Laboratories
    Inventor: Ramesh Raskar
  • Method for deblurring images using optimized temporal coding patterns
    Publication number: 20070258706
    Abstract: A method and system deblurs images acquired of a scene by a camera. A light field acquired of a scene is modulated temporally according to a sequence of ons and offs. An optimal coding pattern is selected. The modulated light field is integrated by a sensor of a camera during an exposure time to generate an encoded input image. The encoded input image is decoded according to a pseudo-inverse of a smearing matrix to produce a decoded output image having a reduced blur.
    Type: Application
    Filed: May 8, 2006
    Publication date: November 8, 2007
    Inventors: Ramesh Raskar, Jack Tumblin, Amit Agrawal
  • Method and apparatus for deblurring images
    Publication number: 20070258707
    Abstract: A method and system deblurs images acquired of a scene by a camera. A light field acquired of a scene is modulated temporally according to a sequence of ons and offs. The modulated light field is integrated by a sensor of a camera during an exposure time to generate an encoded input image. The encoded input image is decoded according to a pseudo-inverse of a smearing matrix to produce a decoded output image having a reduced blur.
    Type: Application
    Filed: May 8, 2006
    Publication date: November 8, 2007
    Inventor: Ramesh Raskar
  • Context aware projector
    Patent number: 7292269
    Abstract: A method displays an output image on an object. A set of unique markers are fixed to the object at predetermined locations. An input image of the object and the markers is acquired with a camera in a fixed physical relationship to a projector. A pose of the projector with respect to the markers is determined from the image. Then, one or more output images related to the object can be projected onto the object, at predetermine locations, according to the pose of the projector and the unique markers.
    Type: Grant
    Filed: April 11, 2003
    Date of Patent: November 6, 2007
    Assignee: Mitsubishi Electric Research Laboratories
    Inventors: Ramesh Raskar, Clifton L. Forlines, Paul A. Beardsley
  • System and method for mechanically adjusting projector pose with six degrees of freedom for image alignment
    Patent number: 7252387
    Abstract: A method adjusts a pose of a projector with respect to a display surface. A homography HD,P is determined between a display surface and a projector. The homography HD,P is decomposed into rotation and translation parameters expressing a pose MP of the projector. An ideal pose M0 of the projector corresponding to an ideal homography H0 is determined. A pose adjustment MA is determined according to MA=M0(MP)?1. The pose adjustment MA is decomposed into rotation and translation adjustment parameters. Then, the projector is adjusted mechanically to the ideal pose M0 according to the rotation and translation adjustment parameters.
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: August 7, 2007
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Ramesh Raskar, Jeroen van Baar
  • Position and orientation sensing with a projector
    Patent number: 7242818
    Abstract: A position and orientation of a projector are determined from projected images. First, a homography between a camera and a planar surface, where the relationship between the camera and planar surface is fixed, is determined. Next, a known pattern is projected on the planar surface with a projector having known intrinsic parameters and an unknown position and orientation. An image of the known pattern is acquired with the camera, and a position and orientation of the projector is determined from the image using the homography and the intrinsic parameters.
    Type: Grant
    Filed: January 17, 2003
    Date of Patent: July 10, 2007
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Paul A. Beardsley, Ramesh Raskar, Vaibhav Vaish
  • Radio and optical identification tags
    Patent number: 7229023
    Abstract: An identification tag is formed with a single microcircuit. The microcircuit includes an optical transceiver, a radio transceiver, both connected to a memory storing an identification code. At least one of the transceivers operates in receive mode, and at least one of the transceivers operates in transmit mode. The identification code is transmitted by the transceiver operating in the transmit mode in response to receiving a predetermined signal by the transceiver operating in the receive mode.
    Type: Grant
    Filed: August 19, 2003
    Date of Patent: June 12, 2007
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventor: Ramesh Raskar
  • Self-correcting rear projection television
    Patent number: 7227592
    Abstract: In a rear projection television, cathode ray tubes are mounted inside an enclosure so that each cathode ray tube projects output images onto a rear projection screen using a corresponding electron beam. Calibration images are generated for each cathode ray tube. A camera, also mounted inside the enclosure, acquires an input image of each calibration image. A distortion in each input image is measured, and the output images of the cathode ray tubes are corrected by adjusting the signals controlling the corresponding electron beams according to the distortion.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: June 5, 2007
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Richard C. Waters, Jay E. Thornton, Ramesh Raskar, Mamoru Kato, Paul H. Dietz
  • Stylized imaging using variable controlled illumination
    Patent number: 7218792
    Abstract: A method generates a stylized image. First, a set of images is acquired of a scene. Each image is acquired under a different lighting condition. Silhouette edges are detected in the set of images. Texture regions are identified in the set of images according to the silhouette edges, and an output image is generated from a combination of the set of images wherein the silhouette edges and the texture regions are altered so as to enhance or de-emphasize selected details.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: May 15, 2007
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Ramesh Raskar, Jingyi Yu
  • Enhancing low quality videos of illuminated scenes
    Publication number: 20070098288
    Abstract: A method enhances a low quality video. An input video Vjin is acquired of a scene under uncontrolled illumination. The input video Vjin is smoothed to produce a noise-reduced video Sj. Temporal gradients Gtj (x, y) are determined for each frame j of the noise reduced video Sj. The gradients Gtj (x, y) are thresholded to generate a binary mask Mj(x, y). For each frame, weights are determined according Wj (x, y)=F(Mk(x, y), and a spatial gradient field is determined according to Gxyj (x, y). Then, an output video Vjout is constructed from the spatial gradient field Gxyj.
    Type: Application
    Filed: March 19, 2003
    Publication date: May 3, 2007
    Inventors: Ramesh Raskar, Adrian Ilie
  • Detecting silhouette edges in images
    Patent number: 7206449
    Abstract: A method detects silhouette edges in images. An ambient image is acquired of a scene with ambient light. A set of illuminated images is also acquired of the scene. Each illuminated image is acquired with a different light source illuminating the scene. The ambient image is combined with the set of illuminated to detect cast shadows, and silhouette edge pixels are located from the cast shadows.
    Type: Grant
    Filed: March 19, 2003
    Date of Patent: April 17, 2007
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Ramesh Raskar, Jingyi Yu
  • Field display system
    Publication number: 20070053201
    Abstract: A display system includes display elements embedded in a playing surface. The display elements are configured to display images or video in the playing surface. The playing surface can be a soccer field, a football field, a rugby field, a baseball field, a track field, a horse racing track, a tennis court, a basketball court, a performance stage, and combinations thereof.
    Type: Application
    Filed: August 23, 2005
    Publication date: March 8, 2007
    Inventors: Paul Dietz, William Yerazunis, Ramesh Raskar
  • Retargeting images for small displays
    Publication number: 20070025637
    Abstract: A method retargets an image to a different size. An input image is segmented into regions. Selected regions are cut from the input image to construct a background image. The background image is scaled to a predetermined size, and the selected regions are pasted back into the scaled background image to produce an output image.
    Type: Application
    Filed: August 1, 2005
    Publication date: February 1, 2007
    Inventors: Vidya Setlur, Michael Gleicher, Bruce Gooch, Saeko Takagi, Ramesh Raskar
  • Method for estimating camera settings adaptively
    Publication number: 20070025720
    Abstract: A camera is configured to adaptively determine camera settings. The camera includes a plurality of sensors elements configured to acquire a current image of a scene according to a current set of camera settings. A number of sensor elements having a set of desirable properties is measured. Then, a next set of camera settings that maximize an overall number of sensor elements having the set of desirable properties is determined to acquire a next better image.
    Type: Application
    Filed: July 28, 2005
    Publication date: February 1, 2007
    Inventors: Ramesh Raskar, Amit Agrawal, Shree Nayar, Yuanzhen Li