| CPC G06T 17/00 (2013.01) [G06F 30/13 (2020.01)] | 9 Claims |
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1. An automatic generation method for three-dimensional morphology of ruts in asphalt pavements, comprising:
Step 1, constructing a standard rut cross-section representation model: based on a pavement reference line, sequentially arranging seven feature points A, B, C, D, E, F and G from left to right and sequentially connecting the seven feature points by a curve to form a W-shaped standard rut cross-section representation model with two sides being raised, wherein the feature points A and G both intersect with the pavement reference line and are referred to as a left edge point and a right edge point respectively; the feature points B and F are both located above the pavement reference line and are referred to as a left raised point and a right raised point respectively; the feature points C, D and E are all located below the pavement reference line, the feature point D is raised upwards, and the feature points C, D and E are referred to as a bottom left valley point, a bottom raised point and a bottom right valley point respectively; a plurality of enclosed sections are defined by the standard rut cross-section representation model and the pavement reference line; the enclosed section located above the pavement reference line is referred to as a positive section, and the enclosed section located below the pavement reference line is referred to as a negative section;
Step 2: classifying ruts: according to curve shapes of existing rut cross-sections, classifying ruts into nine types: U-shaped ruts without raised edges, U-shaped ruts with one raised edge, U-shaped ruts with two raised edges, W-I-shaped ruts without raised edges, W-I-shaped ruts with one raised edge, W-I-shaped ruts with two raised edges, W-II-shaped ruts without raised edges, W-II-shaped ruts with one raised edge and W-II-shaped ruts with two raised edges, wherein the nine types of ruts are available through matching by adjusting spatial positions of the seven feature points in the standard rut cross-section representation model constructed in the Step 1; the difference between the W-I-shaped ruts and the W-II-shaped ruts is that the bottom raised point D of the W-I-shaped ruts is located in the negative section while the bottom raised point D of the W-II-shaped ruts is located in the positive section;
Step 3, acquiring original rut cross-sections: for an asphalt pavement, three-dimensional morphology of a rut in which is to be generated, selecting a plurality of original rut cross-sections ti at equal intervals in a longitudinal direction of the pavement, wherein i≥3;
Step 4, performing preprocessing: denoising and smoothening each of the original rut cross-sections ti selected in the Step 3 to obtain a rut cross-section Ti that is preprocessed;
Step 5, classifying sections: obtaining intersection points between the rut cross-section Ti and the pavement reference line, and classifying enclosed sections defined by the rut cross-section Ti and the pavement reference line into a plurality of positive sections and a plurality of negative sections according to the intersection points;
Step 6, searching for feature points: matching the number of the positive sections, the number of the negative sections and the distribution of extreme points obtained in the Step 5 with the types of ruts in the Step 2 to determine the type of the rut corresponding to the rut cross-section Ti; then, searching for the feature points of the rut cross-section Ti in each of the positive sections and each of the negative sections according to the determined type of the rut;
Step 7, reconstructing a rut cross-section Ti: connecting the feature points by a smooth curve to form the reconstructed rut cross-section Ti; and
Step 8, in a three-dimensional environment, sequentially connecting all the reconstructed rut cross-sections Ti in the longitudinal direction of the pavement to generate three-dimensional morphology of the rut.
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