×

Structure and method for reducing spatial noise

  • US 5,844,627 A
  • Filed: 09/11/1995
  • Issued: 12/01/1998
  • Est. Priority Date: 09/11/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A digital filter for removing noise in a video image, said video image formed by successive frames, each frame including first and second fields, each field including multiple pixels, said digital filter comprising:

  • means for computing, for each pixel of a frame of said video image, (i) a first variance based on a first group of pixels, selected from said frame, adjacent said pixel; and

    (ii) a second variance based on a second group of pixels, adjacent said pixel and equal in number as said first group of pixels, selected from the field which includes said pixel;

    means for selecting, as a neighborhood variance, the lesser of said first variance and said second variance; and

    an adaptive filter, receiving said video image and said neighborhood variance, said adaptive filter having a filter coefficient which is a function of said neighborhood variance.

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