| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 86 === This study uses image processing technique with active laser
beam forgeometrical recognition of dies and molds. The mold's
images weregrabbed from two CCD cameras. The gradient filter was
employed with a proper threshold value to get the binary images.
We get three images that obtained by different lighting
positions. All three images areoverlapped together to get the
boundary information. We using mophology method to fill the
empty hole and thin the boundary to get the edges ofeach surface
on the mold. Then we using Mark-area method to divide each
surface and find out the centered and principal axis as the
project direction of laser beam. Finally we calculate the depth
data of each surface on the mold with active laser beam then
judge the feature of the surface by its depth data and the
variation of the slope. Because the shapes of the mold surface
are very complex, we try to recognize plane and revolving
surface such as cone surface,cylindrical surface, spherical
surface, And each revolving axis of revolving surface would be
vertical or parallel to the planar parting surface. To reduce
the interference result from the variation of depth data points,
we calculate the regression line every 10 points. We try to
recognized the feature of the mold surface by its depth data and
the variation of the depth. For plane, spherical and cone
surface, there are some special features with it. For example,
the variation of the depth and slope in principle axes'direction
would be zero for a plane. Finally we'll use a test mold to
prove the theory.
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