Pipeline corrosion default kind identification method

The invention is a pipe corrosion deficiency type incrimination method; the method arranges the magnetic signal data detected by the channel magnetic leakage detector into row according to the channel axial direction, and arranges into a line around the channel, thus forms a data matrix; filters the data with a detecting threshold, the matrix element surpassing the threshold is set with one, the other is set with zero, thus forms a binarization matrix, and the smallest connecting area made up of one in the new matrix forms the sub-matrix; each sub-matrix includes a channel corrosion deficiency information, its data distribution represents the deficiency type character; then carries on process to the acquired sub-matrix, in order to determine its deficiency types. The invention carries on classified process to the large amount of magnetic leakage detecting data according to the simple algorithm and international standards with the detected magnetic leakage distribution character, finally gives the integral estimation to the channel, the method is simple, the efficiency is high, and it has a wide prospect.