MULTI-ROUND ALIGNMENT METHOD AND APPARATUS FOR MAGNETIC FLUX LEAKAGE IN-LINE INSPECTION DATA OF GAS LONG-DISTANCE PIPELINE

The present invention belongs to the field of combination of petroleum and natural gas pipeline in-line inspection technology and artificial intelligence technology, and mainly relates to a multi-round alignment method and apparatus for magnetic flux leakage in-line inspection data of a gas long-distance pipeline. The method comprises the following steps: according to a feature point database, identifying first-level feature point data in two groups of magnetic flux leakage in-line inspection data to be aligned, and performing pipeline segment division on the pipeline to form a plurality of first-level pipeline segments; identifying second-level feature points in the first-level pipeline segments, and using a pipeline segment splitting algorithm to align for the first time the second-level feature points in the first-level pipeline segments; performing an alignment operation again on the second-level feature points identified but not aligned; and, by taking divided second-level pipeline segments as units, suc