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Flat and elongated measurements:
![shapea.jpg (8198 bytes)](shapea.jpg)
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The measurement of particle shape (flat and elongated in the aggregate
business) has long been a tedious manual task using proportional calipers. An
alternative is to use high speed imaging technologies to measure the shape of coarse
aggregate particles. |
![shapeb.jpg (2516 bytes)](shapeb.jpg)
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Using a moving conveyor belt, images are passed by two video cameras which
image the pieces from two orientations. |
![](plan.gif)
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The length and width of the fragment are determined from the plan view. |
![](prof.gif)
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The height of the fragment is determined from the profile view. |
![](chart.gif) |
Output statistics table showing sizes and aspect rations of 100
measurements. |
REFERENCES:
Maerz, N. H., and
Zhou, W., 1999. Flat and
elongated: Advances using digital image analysis. Center For Aggregates
Research (ICAR) Seventh Annual Symposium Proceedings, Austin Texas, April 19-21, pp.
B1-4-1 to B1-4-12.
Maerz, N. H., 1998. Aggregate sizing and
shape determination using digital image processing. Center For Aggregates
Research (ICAR) Sixth Annual Symposium Proceedings, St. Louis, Missouri, April
19-20, pp. 195-203.
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