Automatic Defect Segmentation in X-ray Images of Welding Seam

The important step is how to extract and segment the information of defects from inspective image.Mathematical morphology was proposed in the study of flaw extraction technique.Therefore,the area of flaw and background can be removed successfully.In this paper,a few methods for threshold selection were analyzed.And the basic ideas of various methods as well as their advantages and defects were critically reviewed.The experimental results indicate that both of methods can accomplish defect extraction and segmentation automatically,which will lay a good foundation for flaw characteristic parameter extraction and recognition.