Abstract
Electric contact erosion and transfer at electrodes of electric contact greatly affects on degradation of the performance of contact. In this paper, the authors discuss on visualization of change in surface profile of electrodes by means of digital image processing. The change of surface profile in measurement data is buried under errors caused by diffusion and reflection of light. When the data is processed by ordinary smoothing filter, small component of feature in surface profile is lost, and processing of image enhancement magnifies error components. The authors have proposed a new image processing technique for measurement of surface profile of electric contact to keep detail features and eliminate errors in measurement data. Missing measurement data are interpolated, and errors in measurement data are eliminated keeping profile of edge by using nonlinear equalizing filter. Inaddition, the proposed technique discriminates feature and errors by dynamic filter which coefficients depend on neighboring components. From the result, visualization of change in surface profile is realized by the proposed technique.
