Detector for detecting pseudo-contour noise and display apparatus using the detector
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United States of America Patent
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Nov 2, 2004
Grant Date -
Jan 17, 2002
app pub date -
Jul 30, 2001
filing date -
Dec 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pseudo-contour noise detecting device for detecting pseudo-contour noise is provided. The pseudo-contour noise is embodied as contour lines appearing spuriously in a motion picture displayed such that a gradation display is performed by using a plurality of weighted subfields into which one field of an input image, including a plurality of pixels, is divided. The device includes a pseudo-contour noise calculating unit in which, a logic operation is performed, for each subfield, on each pixel of at least a portion of the input image using a value of the each pixel and values of at least one of the pixels surrounding the each pixel. Further, a value corresponding to an amount of pseudo-contour noise is calculated according to a number of subfields in which a difference is detected between the value of the each pixel and the values of the at least one of the pixels surrounding the each pixel.
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