Video signal processing
AssigneeSnell & Wilcox Limited
InventorsMartin Weston, William Beningfield
Life of this patent
Estimating the term…
Abstract
In video scratch repair, scratches are treated as additive pedestals which are constant or slowly changing along the scratch. For a given picture, these pedestals are estimated and subtracted from the video input to reveal original picture detail. The pedestal can be estimated by heavily filtering along the direction of the presumed scratch, the output of a prior art scratch detector.
Claims10
A method of repairing a video scratch or like artifact, comprising the steps of estimating an additive pedestal, which is constant or slowly changing along the scratch or like artifact, and subtracting the estimate of this pedestal from the video input to reveal original picture detail.
A method according to any one of the preceding claims, in which the estimate of the pedestal is clipped prior to subtraction from the video input.
Apparatus for repairing a video scratch or like artifact, comprising a scratch detector;
- a filter for averaging the output of the scratch detector along the direction of the assumed scratch to estimate an additive pedestal, which is constant or slowly changing along the scratch or like artifact, and a subtractor for subtracting the estimate of this pedestal from the video input to reveal original picture detail.
Apparatus for repairing a video scratch or like artifact, comprising a median filter;
- a filter for averaging the output of the median filter along the direction of the assumed scratch to estimate an additive pedestal, which is constant or slowly changing along the scratch or like artifact, and a subtractor for subtracting the estimate of this pedestal from the video input to reveal original picture detail.
Dependencies are inferred from the claim text.