Tomographic imaging is a technique for
exploring a cross-section of an inspected object without destruction it.
Raw data of this process, known as the projections, are normally achieved
by repeatedly radiating coherent waveforms through the object in a number
of viewpoints, and receiving them using an array of corresponding detector
in the opposite position. In this research, as a replacement of radiographs,
a series of photographs taken around the opaque object under the ambient
light is completely served as the projections. From the process of tomography,
the outcome is the stack of pseudo cross-sectional image, not the internal
of which is authentic, but the edge or contour is valid. The parameters
of the process, including the type of algorithm, the number of projections,
and the distance from the object to the projection plane, are investigated
comprehensively. Several applications can implicitly take advantages from
the stack of contour, for instance, 3D modeling and geometric measurements.
Also the correction scheme for partially concave occlusion of the object
is brought up. Nevertheless, the process has a problem to extract the
totally-concave-occlusion shape since the concave area does not express
itself on the outline of any projection.
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