publication . Article . Other literature type . 2003

INFORMATION ON GRAIN SIZES IN GRAVEL-BED RIVERS BY AUTOMATED IMAGE ANALYSIS

Sime, Lc; Rob Ferguson;
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  • Published: 01 Jul 2003
Abstract
ABSTRACT The time required in the field to characterize textural variation over gravel surfaces can be reduced by taking vertical photographs for subsequent image analysis. We present modified edge-detection algorithms which combine edge seeding with an image porosity concept and partial watershed segmentation. The methods allow quick, reliable, and operator-independent size analysis from a wide range of vertical bed-surface images. They are tested using 24 naturally lit images of an exposed river bed with mixed lithologies and partial burial of gravel by sand. Grain-size percentiles derived by automated image analysis correlate closely with those from manual im...
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