Image measurement on the tooth shape chain board

A new kind of measurement method on geometrical parameters and roundness of tooth shape chain by CCD image technology is put forward,and non-contact measurement in one system is realized.the noise was first reduced for image collected by CCD device,and image was segmented by bivalency,and then image edge was extracted.In the course of measurement,the aperture,angle between two line segments and pitch were calculated and measured by self-developed program.Roundness error was evaluated by minimum two-multiply Law.The error of pitch,the error of angle between two lines and the roundness error are respectively 0.007mm,0.473°and 8.4μm.The reasons of measurement error were analyzed.Experiment shows that measurements on geometrical size and evaluation on roundness error of the tooth shape chain board by this measurement method are feasible.