Patents by Inventor Lloyd G. Allred

Lloyd G. Allred 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: 8295635
    Abstract: An apparatus for facilitating elimination of ambient light from an image of an object, comprising an illumination apparatus adapted to sequentially illuminate the object using multiple lighting arrangements, an image sensor. The apparatus adapted to form on the image sensor (i) a first image of the object using a first illumination arrangement, (ii) a second image of the object using a second illumination arrangement, and (iii) a dark image of the object without illumination.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: October 23, 2012
    Assignee: Bausch & Lomb Incorporated
    Inventors: Jeffrey B. McBeth, Lloyd G. Allred, Ning Zhang, Barry T. Eagan
  • Patent number: 8254724
    Abstract: A method for determining a centroid coordinate of an image spot, comprising a) determining a search region having a border, b) identifying a first pixel in the search region, the pixel having a first intensity value, c) determining an upper threshold intensity value greater than the first intensity value, d) searching for a second pixel within the search region having an intensity value that is greater than the upper threshold intensity value, and e) upon finding the second pixel, designating the first pixel an integration region center.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: August 28, 2012
    Assignee: Bausch & Lomb Incorporated
    Inventor: Lloyd G. Allred
  • Patent number: 8092024
    Abstract: An apparatus for measuring a subject's eye having an instrument axis, comprising a slit projector for projecting slits of light, at least one sensor. The apparatus being adapted to form a first image of light from a first slit on the at least one sensor after the light scatters from the eye along a first pathway. The apparatus adapted to form a second image of light from the first slit on the at least one sensor after the light scatters from the eye along a second pathway. The apparatus comprising a processor operatively coupled to receive the first image and the second image, the processor adapted to perform a projective transformation of the second image and to combine data from the first image and the second image, after it is transformed, to form a third image.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: January 10, 2012
    Assignee: Bausch & Lomb Incorporated
    Inventors: Lloyd G. Allred, Jeffrey B. McBeth
  • Patent number: 7980698
    Abstract: Aspects of the invention are directed to apparatus and methods for automatically setting a power level of light emitted by a light source; illuminating a retina of a patient with the light emitted by the light source; receiving, at a sensor, light reflected from the retina of the patient; providing a signal based upon the received light; determining whether the signal meets one or more signal quality criteria; automatically setting a second power level of light emitted by the light source; and repeating the steps of illuminating the patient's eye, receiving reflected light, providing the signal, and determining whether the signal meets the signal quality criteria. In some embodiments, setting the second power level is performed in response to determining whether the signal meets the signal criteria. In still other embodiments, the method comprises selecting an operating power based upon the signal quality criteria.
    Type: Grant
    Filed: November 19, 2008
    Date of Patent: July 19, 2011
    Assignee: Bausch & Lomb Incorporated
    Inventors: Lloyd G. Allred, Jeffrey B. McBeth, Barry Eagan
  • Patent number: 7874674
    Abstract: Methods and apparatus for facilitating determination of centroids of image spots in an image containing an array of image spots generated by an aberrometer, the image comprising a first plurality of pixels each pixel having a corresponding intensity value, the method comprising calculating an average intensity value for a second plurality of pixels in a perimeter around a pixel, the average calculated using a subset of the second plurality exclusive of at least a portion of the pixels in the perimeter.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: January 25, 2011
    Inventors: Lloyd G. Allred, Barry T. Eagan
  • Patent number: 7859677
    Abstract: An optical system calibration system and method particularly suited for calibrating the optical slit planes in an ophthalmic diagnostic instrument. The system includes an illumination source projector, an illumination image receiver, and a calibration component all having known relative positions, orientations and physical and optical characteristics. The calibration component includes at least two separated, diffusely reflecting surfaces. Images of an exemplary slit illumination pattern projected onto the calibration component and formed on the diffusely reflecting surfaces are detected by the image receiver such as a video camera. Based upon camera image coordinates and triangulation parameters of the projector, the receiver, and the calibration component, the slit image positions on the image detector plane can be calibrated to the axially displaced, diffusely reflecting calibration component surface positions.
    Type: Grant
    Filed: December 13, 2006
    Date of Patent: December 28, 2010
    Assignee: Bausch & Lomb Incorporated
    Inventors: Ming Lai, Lloyd G. Allred
  • Publication number: 20100123874
    Abstract: Aspects of the invention are directed to apparatus and methods for automatically setting a power level of light emitted by a light source; illuminating a retina of a patient with the light emitted by the light source; receiving, at a sensor, light reflected from the retina of the patient; providing a signal based upon the received light; determining whether the signal meets one or more signal quality criteria; automatically setting a second power level of light emitted by the light source; and repeating the steps of illuminating the patient's eye, receiving reflected light, providing the signal, and determining whether the signal meets the signal quality criteria. In some embodiments, setting the second power level is performed in response to determining whether the signal meets the signal criteria. In still other embodiments, the method comprises selecting an operating power based upon the signal quality criteria.
    Type: Application
    Filed: November 19, 2008
    Publication date: May 20, 2010
    Inventors: Lloyd G. Allred, Jeffrey B. McBeth
  • Publication number: 20100111421
    Abstract: A method for determining a centroid coordinate of an image spot, comprising a) determining a search region having a border, b) identifying a first pixel in the search region, the pixel having a first intensity value, c) determining an upper threshold intensity value greater than the first intensity value, d) searching for a second pixel within the search region having an intensity value that is greater than the upper threshold intensity value, and e) upon finding the second pixel, designating the first pixel an integration region center.
    Type: Application
    Filed: November 6, 2008
    Publication date: May 6, 2010
    Inventor: Lloyd G. Allred
  • Publication number: 20100111381
    Abstract: An apparatus for facilitating elimination of ambient light from an image of an object, comprising an illumination apparatus adapted to sequentially illuminate the object using multiple lighting arrangements, an image sensor. The apparatus adapted to form on the image sensor (i) a first image of the object using a first illumination arrangement, (ii) a second image of the object using a second illumination arrangement, and (iii) a dark image of the object without illumination.
    Type: Application
    Filed: November 6, 2008
    Publication date: May 6, 2010
    Inventors: Jeffrey B. McBeth, Lloyd G. Allred, Ning Zhang, Barry T. Eagan
  • Publication number: 20100110380
    Abstract: An apparatus for measuring a subject's eye having an instrument axis, comprising a slit projector for projecting slits of light, at least one sensor. The apparatus being adapted to form a first image of light from a first slit on the at least one sensor after the light scatters from the eye along a first pathway. The apparatus adapted to form a second image of light from the first slit on the at least one sensor after the light scatters from the eye along a second pathway. The apparatus comprising a processor operatively coupled to receive the first image and the second image, the processor adapted to perform a projective transformation of the second image and to combine data from the first image and the second image, after it is transformed, to form a third image.
    Type: Application
    Filed: November 5, 2008
    Publication date: May 6, 2010
    Inventors: Lloyd G. Allred, Jeffrey B. McBeth
  • Publication number: 20090153738
    Abstract: Methods and apparatus for facilitating determination of centroids of image spots in an image containing an array of image spots generated by an aberrometer, the image comprising a first plurality of pixels each pixel having a corresponding intensity value, the method comprising calculating an average intensity value for a second plurality of pixels in a perimeter around a pixel, the average calculated using a subset of the second plurality exclusive of at least a portion of the pixels in the perimeter.
    Type: Application
    Filed: December 12, 2007
    Publication date: June 18, 2009
    Inventors: Lloyd G. Allred, Barry T. Eagan
  • Patent number: 7478908
    Abstract: An apparatus for determining a position of a subject's cornea, comprising a camera, a first illumination apparatus adapted to provide a first beam of light and a first diffuse portion of light that are coincident, and a second illumination apparatus adapted to provide a second beam of light and a second diffuse portion of light, that are coincident. In some embodiments, the first, second, third and fourth images are disposed on the midpoints of a square, when a cornea is located along an optical axis of camera.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: January 20, 2009
    Assignee: Bausch & Lomb Incorporated
    Inventors: Ming Lai, Barry T. Eagan, Lloyd G. Allred
  • Publication number: 20080144035
    Abstract: An optical system calibration system and method particularly suited for calibrating the optical slit planes in an ophthalmic diagnostic instrument. The system includes an illumination source projector, an illumination image receiver, and a calibration component all having known relative positions, orientations and physical and optical characteristics. The calibration component includes at least two separated, diffusely reflecting surfaces. Images of an exemplary slit illumination pattern projected onto the calibration component and formed on the diffusely reflecting surfaces are detected by the image receiver such as a video camera. Based upon camera image coordinates and triangulation parameters of the projector, the receiver, and the calibration component, the slit image positions on the image detector plane can be calibrated to the axially displaced, diffusely reflecting calibration component surface positions.
    Type: Application
    Filed: December 13, 2006
    Publication date: June 19, 2008
    Inventors: Lloyd G. Allred, Ming Lai
  • Publication number: 20080074615
    Abstract: An apparatus for determining a position of a subject's cornea, comprising a camera, a first illumination apparatus adapted to provide a first beam of light and a first diffuse portion of light that are coincident, and a second illumination apparatus adapted to provide a second beam of light and a second diffuse portion of light, that are coincident. In some embodiments, the first, second, third and fourth images are disposed on the midpoints of a square, when a cornea is located along an optical axis of camera.
    Type: Application
    Filed: September 27, 2006
    Publication date: March 27, 2008
    Inventors: Ming Lai, Barry T. Eagan, Lloyd G. Allred
  • Publication number: 20080021549
    Abstract: An accommodating intraocular lens, comprising an optical system adapted to provide variable optical power, and a drive mechanism configured to alter a focal plane of the optical system, the drive mechanism being adapted to provide at least one of a selectable speed of accommodation and disaccommodation. The drive mechanism may comprise a branch to control a speed of one of accommodation and disaccommodation.
    Type: Application
    Filed: July 21, 2006
    Publication date: January 24, 2008
    Inventors: Barry T. Eagan, Lloyd G. Allred, Jeffrey B. McBeth
  • Patent number: 7219998
    Abstract: An ophthalmic placido pattern 10 is used to determine a curvature of an anterior surface of a cornea of an eye. The pattern 10 includes a series of alternating light and dark concentric rings 12 and 14 centered about a central point 16. A series of shaped geometric shapes 18 and 20 are placed about at least some of the concentric rings 12 and 14. The shapes 18 and 20 are of a contrasting color with respect to the ring 12 or 14 on which the shape 18 or 20 is placed.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: May 22, 2007
    Assignee: Bausch and Lomb Incorporated
    Inventors: Donald Charles Grove, Lloyd G. Allred
  • Patent number: 5775806
    Abstract: A process and system for determining the integrity of an object by analyzing its dynamic heat properties is disclosed. A properly functioning reference object is heated and an infrared camera is positioned above the object. A digital computer collects the infrared images of the object and analyzes its dynamic heat properties. Only heat changes within predefined regions of the object are analyzed and the data is reduced to a peak temperature across each region for a given time. This data is stored and used for future reference. Next, a test object is sampled in the same manner. The reference and test object data is then compared by employing a complex neural network. The neural network uses confidence estimates and historical data on similar reference and test objects to determine the integrity of the object. Thermal images of objects under test are graphically displayed on a video screen.
    Type: Grant
    Filed: September 12, 1996
    Date of Patent: July 7, 1998
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Lloyd G. Allred