The basic principle of hole detection technology is to use optical means to transmit the internal conditions of sealed objects through small holes, and then to evaluate, detect and diagnose the optical patterns. The endoscope hole detector can extend the visual distance of human beings, change the direction of the line of sight arbitrarily, and accurately observe the condition of the inner surface of objects. In addition, there is no contact with the target object, no damage or damage, and there is no need to disassemble the target and object. Therefore, it is an important means of industrial nondestructive testing.
（The plane）
The aero-engine is the heart of an aircraft, and the most prone areas for failure are high-pressure compressor, combustion chamber and high-pressure turbine. It is impossible to access these hot parts without decomposing the engine. Under normal circumstances, endoscopic hole detector inspection can be divided into regular inspection, targeted inspection and expanded regional inspection. 2. Provide basis for aircraft engine repair. (3) for the aircraft engine manufacturers to provide valuable information to aircraft engine borescope inspection and fault decision demand as the background, on the basis of related technologies and methods, to conduct the endoscope borescope image feature extraction technology application in aeroengine fault diagnosis research, designed the aircraft engine fault diagnosis system quickly.
（Aircraft maintenance）
Endoscope hole detection is one of the important nondestructive testing methods for aero-engine, which plays an increasingly important role in fault diagnosis and maintenance of aero-engine. In practical application, there are some technical requirements such as urgent improvement of data processing method and fault diagnosis level. Therefore, it is an important direction to apply computer technology and digital image processing technology to the hole detection technology to improve the feature extraction and fault decision level of hole detection image.