Image analysis – Image enhancement or restoration – Edge or contour enhancement
Reexamination Certificate
2007-04-24
2007-04-24
Mehta, Bhavesh M (Department: 2624)
Image analysis
Image enhancement or restoration
Edge or contour enhancement
C382S233000
Reexamination Certificate
active
11235066
ABSTRACT:
An image processing apparatus reduces a distortion that occurs at a tile boundary (tile distortion) when an image is compressed or expanded on a tile-by-tile basis. It is equipped with a tone jump detecting section, a slope calculating section, and a slope correcting section. The tone jump detecting section calculates differences between the values of pixels on both sides of the tile boundary and detects a tone jump in the tile distortion according to the differences. The slope calculating section calculates slope-like correction values to be used for causing the tone jump to approach zero in a prescribed length ((prescribed length)<(tile length)), and adds the slope-like correction values to the values of pixels near the tile boundary. As a result, the steep tone jump due to the tile distortion is corrected into a gentle slope-like variation. Tile distortions are reduced properly by this processing.
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Kuhn Jordan
Mehta Bhavesh M
Nikon Corporation
Oliff & Berridg,e PLC
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