| 摘要 |
PURPOSE:To make it possible to perform detection by a simple system constitution, by judging the change in central position of the width of a body, based on the change in interval from the position of the synchronization signal of the specified first and second image signals to the maximum position. CONSTITUTION:Scanning is performed by TV cameras 6a and 6b, which are arranged along the axis of a pipe 1, like scanning lines 3a and 3b approximately vertically with the axis of the pipe 1. Thus image signals 4a and 4b are obtained and inputted to a real-time electrooptical correlator 101 having two ultrasonic wave and light modulators (not shown) and a Fourier transformation optical system (not shown). A mutual correlation signal C(tau) of the signals 4a and 4b is detected by a peack detecting circuit 103. A deviation (e) from the center between horizontal synchronizing signals at the peak position is detected as the bending of the pipe 1. |
