Three-dimensional reconstruction method for damaged corrosive pitting topography of metal panel

The invention discloses a three-dimensional reconstruction method for the damaged corrosive pitting morphology of a metal panel. The three-dimensional reconstruction method comprises the following steps: scanning the corrosion pit surface topography of the metal panel so as to be used as a reference picture; aligning laser emitted by a laser displacement sensor to the top of a corrosion pit, setting the indication of the laser displacement sensor as zero, translating the laser displacement sensor so as to enable the laser to be aligned to the bottom of the corrosion pit, wherein the indication of the sensor is the height difference from the top to bottom of the corrosion pit, and the height difference is the depth of the corrosion pit; and establishing an NURBS (Non-Uniform Rational B-Spline) surface by utilizing the gray scale value of the reference picture, and stretching the NURBS surface into a body, thus completing the reconstruction of the pitting corrosion area topography of a test piece. The three-dimensional reconstruction method is simple and accurate to scan and input; the measurement precision of the laser displacement sensor can achieve 10-3mm which can meet the requirement of the corrosion pit on depth less than 1mm; and the existing commodity software can be adopted for replacing the manual programming, so that the working efficiency is improved.