The block diagram of the program for automatic detection and identification of defects is shown in the figure.
Defect detection process
In the X-ray non-destructive flaw detection automatic detection system, the automatic detection and identification of defects is the core part of the system. The program flow of this part can be divided into the following steps:
l) program initialization: when the program starts running, the definition and assignment of some variables and the initialization of the video capture card;
2) Image acquisition and serial communication interface initialization: use the video capture card to collect X-ray inspection images, and simultaneously initialize the serial communication interface to complete the initial connection of serial communication;
3) Image preprocessing and acquisition of position information: complete some necessary image preprocessing operations to ensure effective detection of the fuzzy defect detection algorithm; obtain the position information of the spiral steel pipe forward to ensure the calculation of the defect position information:
The encoder converts the displacement signal into a pulse signal, records the displacement signal of the transmission vehicle by the number of the pulse signal, and transmits the displacement signal to the computer through the serial communication interface for processing, thereby determining the position information of the defect. Three defect detection process
In the X-ray non-destructive flaw detection automatic detection system designed and implemented in this paper, the automatic detection and identification of defects is the core part of the system. The program flow of this part can be divided into the following steps:
l) program initialization: when the program starts running, the definition and assignment of some variables and the initialization of the video capture card;
2) Image acquisition and serial communication interface initialization: use the video capture card to collect X-ray inspection images, and simultaneously initialize the serial communication interface to complete the initial connection of serial communication;
3) Image preprocessing and acquisition of position information: complete some necessary image preprocessing operations to ensure effective detection of the fuzzy defect detection algorithm; obtain the position information of the spiral steel pipe forward to ensure the calculation of the defect position information:
4) Detection defect: Apply fuzzy defect detection algorithm to detect whether there is defect in the current X-ray inspection image, and mark the detected defect in the flaw detection image; 5) Identify the defect: calculate some basic information of the defect, such as: size Information such as number, location, and location, and consistently identify and determine detected defects according to certain criteria;
6) Whether the defect exceeds the standard: If the defect is out of the standard, if the standard is exceeded, the spray mark signal is sent, and the defect exceeding the standard is marked on the spiral steel pipe; if no defect exceeds the standard, the program returns to the initial state, and the next frame X is prepared. Collection, detection and identification of radiographic images.
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