The visual inspection based on an endoscope has played an important role in modern fault diagnosis of aero-engines.An automatic measurement approach to cracks of the aero-engine inner parts is studied in this paper. In this method, the area of the crack needs to be selected, it is subjected to image re-processing, and the pseudo cracks are removed, the crack is measured and calculated. Automatic measurement system has developed based on this method. The automatic measurement system includes crack segmentati...