To correctly and consistently detect the butt groove position even in a steel plate having "droop" on its end.
A detecting method includes an image pickup step of picking up an image of a butted portion of two steel plates so that a butting line is in the horizontal axial direction of an image pickup plate of an image pickup apparatus, a binarizing step of outputting the binarized image of a partial image obtained from the picked-up image acquired in the image pickup step by using the preset threshold T, a step (a) for computing the differential value V of the brightness in the y-axis direction for the binarized brightness value U' of respective pixel coordinates (i, j) with the horizontal axial direction being the x-axis direction, and the vertical axial direction being the y-axis direction, for each i, a step (b) of computing the brightness differential projection value W by integrating the brightness differential value V computed in the step (a) for i, and a peak position detection step of obtaining the pixel position of the peak in the brightness differential projection value W computed in the step (b), and detecting it as each butt groove position of the two steel plates.
UMEMURA JUN
KODAMA TADASHI
YANO RYUTARO
HONDA YASUZO
| JPS54107445A | 1979-08-23 | |||
| JPH01100411A | 1989-04-18 | |||
| JPH10311707A | 1998-11-24 |
Miaki Kametani
Koji Hagiwara
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