Based On The Water Level Of The Image Automatically Detect The Study

Currently, there are many methods to detect water level, such as float-type water level gauge, pressure-type water level gauge and ultrasonic water level gauge etc. It has been used in different conditions. Auto Water Level Detection (AWLD), based on image, is one of core techniques of Remote Water Monitor System (RWMS). This technique is an untouched-AWLD. Based on image, this technique enrich the knowledge of image processing, and give an novel method of detection water level.The key techniques and new methods presented in this thesis are listed below:(1) For the real and specific AWLD condition, constructed the whole flow chart of recognition.(2) Presented a novel AWLD method based on image. After image rectification and light intensity rectification, the chain code technique was used to trace object's contour and remove useless information, and the line of water level in the image was located accurately.(3) Presented a solution of transformation between the water level in image and the real altitude water level.The algorithms presented in this thesis have been put into practice in Fenhe RWMS, Shanxi Province. During more than one year, the error rate of detected water level is less than 2.0cm. It hasn't been affected by temperature and water quality. It can also be used in the situation of abnormal fall and large area water detection. This techniques provide a brand-new auto water level measure for remote zone of our country, especially for stream monitor and auto water level detection in mountainous badly conditions.