Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1993-11-01
1995-05-09
Groody, James J.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348607, H04N 5213
Patent
active
054144728
ABSTRACT:
A median filter adaptively increases a window size when there is a possibility that an impulse noise will be present in the median value. When it is determined that an impulse noise is not present in the median value obtained as a median-filtering result, the median filter checks whether or not an impulse noise is present in a target pixel value which is to be subjected to median filtering. When there is a possibility that an impulse noise is present in the target pixel value, the median filter outputs the median value. On the other hand, when an impulse noise is not present in the median value as a check result, the median filter outputs the input target pixel value. Accordingly, an impulse noise can be effectively eliminated from a video signal mixed with a positive impulse noise and a negative impulse noise, while the edge change of the video signal produced by the median filter itself can be minimized. An adaptive median filter is also described.
REFERENCES:
patent: 4573070 (1986-02-01), Cooper
Groody James J.
Harvey David E.
Samsung Electronics Co,. Ltd.
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