×

System and method for enhancement of coded images using adaptive spatial filtering

  • US 5,812,702 A
  • Filed: 11/22/1995
  • Issued: 09/22/1998
  • Est. Priority Date: 11/22/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for enhancing a low bit-rate encoded image, the method implemented on a computer having a memory and comprising the steps of:

  • receiving a low bit-rate encoded image comprising pixels;

    classifying said pixels into a first, a second, and a third pixel category, wherein the first, second, and third pixel categories are quasi-constant, textural, and dominant edge, respectively, and wherein the step of classifying comprises the substeps of;

    setting the value of selected pixels in the received low bit-rate encoded image to zero to form a modified image;

    determining an a-level zero-crossing measurement as a function of the pixels in the modified image and the pixels in the received low bit-rate encoded image; and

    using the a-level zero-crossing measurement to classify said pixels into the quasi-constant and textural categories;

    applying a first enhancement method to the pixel in the quasi-constant category; and

    applying a second enhancement method to the pixels in the dominant-edge category;

    whereby an enhanced image is generated.

View all claims
  • 7 Assignments
Timeline View
Assignment View
    ×
    ×