ONLINE FAST MEASUREMENT OF SECTION SIZES OF 3-DIMENSIONAL OBJECTS USING BINARY IMAGE-ANALYSIS

We propose a method for online measurement of section sizes of hot-rol led sections. We consider two main points. First, section sizes of the measured workpiece depend on its section outline; here the section ou tline is presented by perpendicularly intersecting the workpiece with an optical plane. Second, online measurement of section sizes is almos t a real-time process; hereto shorten the measurement period, the reco rding process and the initial extraction process of one section outlin e are combined by recording it as three 2-D binary patterns. These pat terns come from three areas of the section outline and are sufficient for calculating the section sizes. The experimental performance of thi s method was tested and verified in our laboratory and in a rolling mi ll in China. A set of the tests are presented. (C) 1998 Society of Pho to-Optical Instrumentation Engineers. [S0091-3286(98)00606-0].