Ringing detector and filter

Details Ringing detector and filter Ringing detector and filter

1996-08-29

1999-08-17

Johns, Andrew W.

Image analysis

Pattern recognition

Feature extraction

382260, G06K 936

Patent

active

059405368

ABSTRACT:
The ringing detector of the invention receives data representing pixel values of a plurality of pixels including: a remarked pixel; a number L (where L is a natural number) of neighboring pixels which are located in the vicinity of the remarked pixel; and a number M (where M is a natural number) of surrounding pixels which are more distant from the remarked pixel than the neighboring pixels are, thereby generating a ringing constant t indicating whether or not a ringing exists in the vicinity of the remarked pixel. The ringing detector includes: a pixel value variation detector for calculating a value x corresponding to a variation in the pixel values of the neighboring pixels; a distance detector for calculating a value y corresponding to a distance between the pixel values of the surrounding pixels and a barycenter of the pixel values of the remarked pixel and the neighboring pixels; and a ringing constant calculator for calculating the ringing constant t based on the values x and y.

REFERENCES:
patent: 4760541 (1988-07-01), Weygandt et al.
patent: 4982294 (1991-01-01), Morton et al.
patent: 5003618 (1991-03-01), Meno
patent: 5598158 (1997-01-01), Linz
patent: 5608824 (1997-03-01), Shimizu et al.
patent: 5617099 (1997-04-01), Warren et al.

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