Method and apparatus for reducing noise in an image sequence

Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C348S624000, C348S620000, C348S621000

Reexamination Certificate

active

06847408

ABSTRACT:
A method and apparatus for reducing noise in an image sequence is provided. Images in the image sequence are recursively filtered on an area-by-area or, for example, pixel-by-pixel, basis. A pixel from an image is compared to a similarly located pixel from a previous image. A difference between one or more parameters of the pixels is determined. One or, preferably, two thresholds are used to classify three types of differences. Depending on the classification, the two pixels are blended together according to their parameters in varying amounts. Relatively small differences indicate a large fraction of the previous pixel to be combined with a small fraction of the current pixel. This substantially reduces the effects of random noise, which tends to cause relatively small, transient variations in the pixels of each image of the image sequence. Relatively large differences indicate the use of 100% of the current pixel without combining any of the previous pixel. Intermediate differences indicate smoothly transitioning from combining a large fraction of the previous pixel to combining none of the previous pixel depending on the differences relative to the thresholds.

REFERENCES:
patent: 5099329 (1992-03-01), Oyama et al.
patent: 5617149 (1997-04-01), Lee et al.
patent: 5903680 (1999-05-01), De Haan et al.
patent: 6281942 (2001-08-01), Wang
patent: 6535254 (2003-03-01), Olsson et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for reducing noise in an image sequence does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for reducing noise in an image sequence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for reducing noise in an image sequence will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3424468

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.