Method and apparatus for measuring characteristics of a surface topology

A three-dimension (3D) topology detection apparatus comprising:

• a processor, one camera, six light sources, one power controller and an equipment bracket;
• wherein slant angles of the six light sources are all 45°, and tilt angles of the six light sources are 0°, 60°, 120°, 180°, 240°, and 300°, respectively;
• the power controller is configured to control light irradiation intensities of the six light sources;
• and
• the processor is configured to execute the following instructions:
• capturing six photos by the camera under different illuminations, wherein the different illuminations refer to the six light sources separately illuminating a test area of a road surface;
• performing gray processing on the six photos, and composing the six photos after the gray processing to obtain a composite intensity matrix of the six photos after the gray processing;
• decomposing the composite intensity matrix of the six photos after the gray processing into a composite matrix with low rank and a noise matrix by using a modified low-rank decomposition algorithm, and calculating a normal vector of the test area of the road surface based on the composite matrix with low rank;
• calculating, based on the normal vector of the test area of the road surface, a texture morphology function of the test area of the road surface by using a global variational algorithm;
• obtaining coordinate information of control points by a three-dimension coordinate instrument, wherein the control points are evenly distributed in borders and a center of an area where to capture the six photos;
• and
• obtaining, based on the coordinate information of the control points and the texture morphology function of the test area of the road surface, an interpolation surface function by using a control point-based interpolation surface algorithm, and summing the texture morphology function of the test area of the road surface and the interpolation surface function to obtain a modified texture morphology function of the test area of the road surface.