Patents by Inventor Terrell Nils Lassiter

Terrell Nils Lassiter 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).

  • Dual level out-of-focus light source for amplification of defects on a surface
    Patent number: 7105848
    Abstract: A web defect inspection system includes line scan cameras positioned across the width of a web and a dual-level out-of-focus light source for illuminating the web. An illumination surface of the dual-level light source has a bright portion adjacent a dark portion. One such dual-level light source is provided by covering a portion of a diffused light surface with an opaque material having a sharp edge. The pixels of each line scan camera are aligned with the dark to light transition of the light source so that each pixel has a no-defect brightness level equal to half of a relative brightness level of the bright portion of the dual-level light source. An image of a defect-free portion of the web consists of pixels having relative brightness levels within a pre-determined range of the no-defect brightness level. Images of defects on the web surface appear three-dimensional as bright and dark areas.
    Type: Grant
    Filed: April 15, 2003
    Date of Patent: September 12, 2006
    Assignee: Wintriss Engineering Corporation
    Inventors: Sujoy Guha, Terrell Nils Lassiter
  • Dual level out-of-focus light source for amplification of defects on a surface
    Publication number: 20040000652
    Abstract: A web defect inspection system includes line scan cameras positioned across the width of a web and a dual-level out-of-focus light source for illuminating the web. An illumination surface of the dual-level light source has a bright portion adjacent a dark portion. One such dual-level light source is provided by covering a portion of a diffused light surface with an opaque material having a sharp edge. The pixels of each line scan camera are aligned with the dark to light transition of the light source so that each pixel has a no-defect brightness level equal to half of a relative brightness level of the bright portion of the dual-level light source. An image of a defect-free portion of the web consists of pixels having relative brightness levels within a pre-determined range of the no-defect brightness level. Images of defects on the web surface appear three-dimensional as bright and dark areas.
    Type: Application
    Filed: April 15, 2003
    Publication date: January 1, 2004
    Inventors: Sujoy Guha, Terrell Nils Lassiter