Patents Examined by Stephen Rinich
  • Patent number: 6363177
    Abstract: Image rotation systems and methods optimally rotate high addressability binary images by transforming the high addressability image to a quasi-grayscale image having normal addressability. A degree of low-pass filtering may be used in conjunction with resampling the image in the process of generating the normal addressability image for rotation. The quasi-grayscale image is then rotated. The rotated quasi-grayscale image is then converted back to a high addressability binary image using a high addressability halftoning process. The systems and methods provide a process wherein high addressability binary images are rotated without introducing gray-level contours or pattern artifacts such as moiré. Further, the apparatus and method provide compact rotation of high addressability images. The density and edge integrity of the processed image are maintained without introducing false contours.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: March 26, 2002
    Assignee: Xerox Corporation
    Inventors: Robert P. Loce, David Glassman, Henry P. Jankowski