In order to accurately measure the thickness of rigid slice,an intelligent determination method based on industrial CT image was proposed. The adaptive weighted mean filter was used to preprocess the CT image to remove the noise in the image. The edge detection method based on Facet model was used to extract the edge pixels of the wall to be measured. The inner and outer edge tracking strategy was used to complete the edge tracking,and the information of the inner and outer boundary points was stored in the structure array to obtain the shortest distance from each boundary point to the outer e...