Development of image based water-level measurement unit using water gauge images

Abstract

We have been studying a imaging type water level measurement method using images recorded water gauges which look like rulers been stuck into rivers vertically. It is the feature of this unit that observed images are collated with the one prerecorded in the time of low water level in order to specify the water border position. We implemented a program based on our method and tested the performance using multiple actual video data acquired under different weather and sunshine conditions and so on. As the result, which shows that 24 hours continuous observation can be accomplished and the calculated value is satisfied within required accuracy at typical video data, we have made sure of the effectiveness of our method.