Apparatus for inspecting light-and-shade portions and method thereof
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United States of America Patent
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-
Sep 2, 2003
Grant Date -
N/A
app pub date -
Apr 5, 1999
filing date -
Jul 21, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A light-and-shade inspection apparatus and method therefor include an image pick-up device for picking up an image of an object across a dimension (e.g., width) thereof to produce an image data, a projection operational portion for calculating a projection data by adding together a predetermined number of the image data, the image data being produced at each scan of the image pick-up device at a predetermined position along the width of the object, a background lightness operational portion for calculating, based on the projection data produced by the projection operational portion, a background lightness of the object across its width, and a difference operational portion for subtracting the background lightness produced by the background lightness operational portion from the image data produced by the image pick-up device, thereby substantially eliminating variations of the background lightness across the width of the object from the image data.
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