Patents Examined by Samie A. Ahmed
  • Image-adaptive quantization for JPEG compression
    Patent number: 7580579
    Abstract: In a method of digital image compression, the spatial frequency content of a digital image is characterized using a relatively sparse sampling of data blocks from the image, and a quantization table is constructed based on the characterization of the spatial frequency content.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: August 25, 2009
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Yu-Wei Wang, Casey L. Miller