公开(公告)号：US4933865A

公开(公告)日：1990-06-12

申请号：US134977

申请日：1987-12-18

申请人： Masanari Yamamoto ,  Yoshikazu Ito ,  Michiko Iwasaki ,  Hiroaki Harada ,  Masako Nishijima

发明人： Masanari Yamamoto ,  Yoshikazu Ito ,  Michiko Iwasaki ,  Hiroaki Harada ,  Masako Nishijima

IPC分类号： G06K9/00

CPC分类号： G06K9/00476

摘要： An apparatus for recognition of shapes in drawings for automatic drawing input in a CAD system including a centerline extraction unit for extracting centerlines drawn in center positions of shapes from the line segments discriminated by a line segment discrimination unit, a symmetry determination unit for determining symmetry of shapes based on intersections between the extracted centerlines and straight lines between end points of contour lines, distances between the endpoints of contour lines and the intersections, angles between the centerlines and the straight lines between endpoints of contour lines, and a shape recognition unit for recognizing, using the result of determination of the symmetry determination unit, a shape, a length of line segment, and a position of line segment not indicated by deriving the shape, the length of line segment, and the position of line segment from a shape, a length of line segment, and a position of line segment indicated, and characters recognized by a character recognition unit. In connection with this shape recognition apparatus, an apparatus is provided for recognition of views in drawings for automatic drawing input. Also, shape recognition apparatuses are provided for setting dimensional values known in other views or derived dimension values calculated on the basis of known dimensional values to contour lines, and for adding line segments by producing a line segment based on a matching check.

摘要翻译： 一种用于在CAD系统中识别用于自动绘图输入的图形中的形状的装置，包括：中心线提取单元，用于从由线段识别单元识别的线段提取形状的中心位置绘制的中心线;对称性确定单元，用于确定对称性 基于提取的中心线与轮廓线的端点之间的直线，轮廓线的端点与交点之间的距离，中心线之间的角度和轮廓线端点之间的直线之间的交点以及用于识别的形状识别单元 使用对称性确定单元的确定结果，线形的形状，长度以及线段的位置，以及线段的长度，线段的长度以及线段的位置， 线段长度，线段位置，识别字符 由字符识别单元。 关于该形状识别装置，提供了一种用于识别用于自动绘图输入的图中的视图的装置。 此外，提供形状识别装置，用于将在其他视图中已知的尺寸值或基于已知尺寸值计算出的导出尺寸值设置为轮廓线，并且通过基于匹配检查产生线段来添加线段。