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1. (WO2017149744) WATER LEVEL MEASUREMENT SYSTEM AND WATER LEVEL MEASUREMENT METHOD

Pub. No.:    WO/2017/149744    International Application No.:    PCT/JP2016/056734
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Sat Mar 05 00:59:59 CET 2016
IPC: G01C 13/00
G01F 23/292
G06T 7/20
G06T 7/60
Applicants: HITACHI KOKUSAI ELECTRIC INC.
株式会社日立国際電気
Inventors: AGATA, Yoshiki
縣 禎輝
Title: WATER LEVEL MEASUREMENT SYSTEM AND WATER LEVEL MEASUREMENT METHOD
Abstract:
Provided is a technology for detecting the water level of a river and the like by image processing. After an angle of view setting process, an area setting process unit sets an arbitrarily defined certain range from the center of the set angle of view as a processing area (S21). Then, a flow processing unit 62 calculates, from the processing area, motion information (flow) and a flow direction (S22, S23), computes a flow density, determines a region having a high density and a close flow direction to be a flow of water current, and deletes flows in other directions (S24). Thereafter, a graph-cut processing unit 63 creates an object seed and a background seed for graph-cutting (S25, S26), and detects a water surface by automatic graph-cutting (S27). After an edge extraction processing unit 64 has performed edge extraction (S28), a water level calculation processing unit 65 determines an edge that satisfies a predetermined condition to be a water level line, and outputs a water level measurement result (S29).