Using the technology of image identification in quality detecting to the well perforation,the unenlightened method of observing the bullets-shooting status is thoroughly changed.After specific pretreatment for the well perforation image,the method of estimating the perimeter and area information can be used to detecting the amount of the perforation.Then a fast and exact positional identification method is gotten,through the principle that the characters of three points can define a circle,to detect other p...