Adaptive, hybrid median filter for temporal noise suppression

Details Adaptive, hybrid median filter for temporal noise suppression Adaptive, hybrid median filter for temporal noise suppression

1992-06-01

1995-01-24

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 41, 348620, G06K 940

Patent

active

053848659

ABSTRACT:
A median filter is modified for temporal suppression of image grain in a time-varying sequence of images. Successive sets of samples are produced by operation of a sample producer (20), each set including a current sample, a sample delayed by a framestore (50), and a sample derived from a recursive component generator (60). A median selector (80) operates upon each set to select the median sample value. Either the median value or the current sample is selected for the filter output, dependent upon an interframe magnitude generated by an adaptive component generator (30). Evaluation of interframe magnitude minimizes artifacts in the reproduction of picture information that is temporarily impulsive, while including the recursive component in the median sample set increases the level of grain suppression.

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