×

Video signal noise reduction system using time-varying filter coefficients

  • US 5,442,407 A
  • Filed: 03/22/1994
  • Issued: 08/15/1995
  • Est. Priority Date: 03/22/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for reducing noise in an input video signal which includes a plurality of video frames, the apparatus comprising:

  • processed frame memory means for storing a noise reduced image;

    motion estimator means for selecting a target block of image components in said frame memory to be used in calculating a noise reduced video signal; and

    motion compensated noise reduction means for calculating said noise reduced video signal by calculating a set of time-varying weighted filtering coefficients for the target block and for generating a motion block of noise reduced image components by averaging a plurality of image components in a current block selected from the video signal with respective image components of the target block as weighted by the coefficients.

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