Patents by Inventor Ou Hu

Ou Hu 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, apparatus and storage medium for enhancing document image, method, apparatus and storage medium for character recognition
    Patent number: 7505632
    Abstract: The present invention relates to method, apparatus and storage medium for enhancing document image, and method, apparatus and storage medium for character recognition. For enhancing the document image especially half-tone block image and improving the recognition ratio thereof, the block image is segmented into line images, which are subject to noise reduction. Then, based on the connected component densities, the noise-reduced line images are sorted into three types including normal line image, broken-stroke line image and hollow-stroke line image. Based on their types and other properties, the noise-reduced line images are enhanced, generating enhanced line images, which as a whole constitutes an enhanced block image.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: March 17, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ou Hu, Xian Li
  • Method, apparatus and storage medium for enhancing document image, method, apparatus and storage medium for character recognition
    Publication number: 20050180660
    Abstract: The present invention relates to method, apparatus and storage medium for enhancing document image, and method, apparatus and storage medium for character recognition. For enhancing the document image especially half-tone block image and improving the recognition ratio thereof, the block image is segmented into line images, which are subject to noise reduction. Then, based on the connected component densities, the noise-reduced line images are sorted into three types including normal line image, broken-stroke line image and hollow-stroke line image. Based on their types and other properties, the noise-reduced line images are enhanced, generating enhanced line images, which as a whole constitutes an enhanced block image.
    Type: Application
    Filed: November 12, 2004
    Publication date: August 18, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Ou Hu, Xian Li