| 摘要 |
PURPOSE:To enable the level of a water surface crossing a target object and the change of the water level with time to be measured by digitally processing video signals obtained by sensing the target object projected from the water surface. CONSTITUTION:A target object 1 is sensed by a camera 4 in the field of measurement and resultant video signals are recorded on a magnetic tape by a recorder 5. Then, after converted to digital video signals by an A/D converter 6 by color signal, such as a signal R, G and B, the regenerative signals of the recorded tape are written in a picture image memory 7. When an on-line processing is conducted without using the recorder 5, the video signals obtained from the camera 4 are directly supplied to the A/D converter 6 as shown by a dotted line. Then, a prescribed arithmetic processing is conducted on the digital R, G and B signals read out from the picture image memory 7 by a CPU system 8 and the level of the water surface 2 and a wave height are obtained and displayed 9. Thus, the level of the water surface crossing the target object and the change of the water level with time can be measured. |
