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.

The maintenance cost of aero engine usually accounts for more than half of the aircraft maintenance cost. It is the concern of all airlines to reduce the maintenance cost of aero engine under the premise of ensuring airworthiness. As an important means of maintenance, endoscope detection plays an important role in reducing the maintenance cost of aero-engine and is the basis of aero-engine maintenance.

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. Endoscope hole detector technology can extend the visual distance of human beings, arbitrarily change the direction of the line of sight, 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 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. Endoscope hole detector technology provides a very effective way for maintenance personnel to check the internal condition of the engine.