公开(公告)号：US6163374A

公开(公告)日：2000-12-19

申请号：US161303

申请日：1998-09-28

申请人： Toshio Otani ,  Kazuhiro Oda ,  Toshiyuki Oenoki

发明人： Toshio Otani ,  Kazuhiro Oda ,  Toshiyuki Oenoki

IPC分类号： B21D5/02 ,  G01B11/02 ,  G01B11/26 ,  G01C1/00 ,  G01C9/00 ,  G06K9/00

CPC分类号： B21D5/02 ,  G01B11/024 ,  G01B11/26

摘要： A bending angle detection system capable of detecting a bending angle of a workpiece with high accuracy, wherein taking into account the fact that the brightness of a linear image formed on a surface of a workpiece is higher than that of a linear image formed on other areas than the workpiece, linear images picked up from the workpiece are automatically sorted out from linear images picked up from other areas according to differences in the brightness values of the linear images so that only the data representative of the linear images formed on the workpiece can be extracted.A linear projected light image formed on the workpiece surface is picked up by a CCD camera, a representative pixel of each scanning line on the picked up, multi-valued linear image is calculated by a representative pixel detecting unit. Based on the frequency distribution of the brightness values of the representative pixels, the workpiece representative pixel extracting unit extracts only the representative pixels associated with the linear projected light image formed on the workpiece from all the representative pixels. Based on the extracted representative pixels, a representative straight line is calculated to obtain a bending angle of the workpiece.

摘要翻译： 一种能够高精度地检测工件的弯曲角度的弯曲角度检测系统，其中考虑到在工件表面上形成的线性图像的亮度高于在其它区域上形成的线性图像的亮度的事实 与工件相比，从工件拾取的线性图像根据线性图像的亮度值的差异从从其他区域拾取的线性图像中自动分类，使得只有表示在工件上形成的线性图像的数据可以是 提取。 由CCD照相机拍摄形成在工件表面上的线性投影光图像，由代表像素检测单元计算拾取的多值线性图像上的每条扫描线的代表像素。 基于代表像素的亮度值的频率分布，工件代表像素提取单元从所有代表像素中仅提取与形成在工件上的线性投影光图像相关联的代表像素。 基于提取的代表像素，计算代表性的直线以获得工件的弯曲角度。