Optimum Filter Design for Water Level Detection
نویسندگان
چکیده
Abstract This report proposes a design method of a digital filter to detect running water region in video signal. As a result of applying this filter, the water level of a river is automatically detected as a boundary between the land region and the water region. Conventional approaches have used the edge detector "vertically" to extract a horizontal line as running water surface. The frame "subtraction" is also accompanied to make it robust against disturbances. A new approach in this report applies the synchronous frame "addition" and "optimized" spatial filer to robustly detect the water level. Variance of pixel value along with each line of the filtered video is used as a feature value. Optimization procedure of the spatial filter coefficients is also proposed so that the system can be adaptive to changes of video shooting condition. Robustness against disturbances such as snow drops and superiority to conventional edge detectors are experimentally confirmed. Keyword water level, filter, video, recognition, design
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