| 摘要 |
PURPOSE:To obtain a size of a material to be rolled with a high precision and speed, by correcting measurements by an image sensor corresponding to the thickness of the material to be rolled and the sectional shape of the end in the direction of size measurement thereof. CONSTITUTION:In case a steel sheet 14 with a thickness (t) is detected by setting an image sensor away by a visual distance D, a width, which the image sensor 12 outputs with respective to a true width (d) of the steel sheet 14, is l, and the true width (d) in the case of the steel sheet 14 having an end in a rectangular sectional shape, the true width (d) is l+tl/D. Actually, the sectional shape of the end is little rectangular, and the true width (d') of the steel sheet corrected corresponding to the sectional shape of the end is equal to K.d, where K is a correcting coefficient corresponding to the sectional shape of the end of the steel sheet, and in case the sectional shape of the end is rectangular, it is determined as 1. |
