Method for detecting three-dimensional texture morphology of asphalt pavement

Abstract

The invention provides a method for detecting the three-dimensional texture morphology of an asphalt pavement. According to the method, the macroscopic texture morphology and the microcosmic texture morphology of the pavement can be obtained at the same time. On the basis of a traditional photometric stereo three-dimensional reconstruction technology, six illumination light sources are added, and a low-rank decomposition correction algorithm and a global integration algorithm are adopted to improve a two-step algorithm of normal vector solving and three-dimensional reconstruction, so that error interference is reduced, and test precision is improved. Six light sources are required to respectively and independently irradiate a test surface from six directions of a zenith angle of 45 degrees, an oblique angle of 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees and 300 degrees, and cameras fixed right above the test surface are adopted to respectively collect six road surface images under different illumination conditions. Compared with a traditional road surface texture morphology testing method, the method can remarkably improve the testing precision of the road surface texture morphology, and has the advantages of being rapid, accurate, high in repeatability and the like.

Description

technical field [0001] The invention belongs to the field of road surface engineering traffic safety, and relates to a method for detecting three-dimensional texture topography of asphalt pavement. Background technique [0002] Good anti-skid performance of the road surface can provide good adhesion for high-speed vehicles, which is an important guarantee for driving safety. One of the main reasons for frequent traffic accidents is the lack of anti-skid ability of the pavement, and the anti-skid performance of asphalt pavement is closely related to the shape of the road surface. The Pavement Characteristics Committee of the 18th World Road Conference found that the anti-skid force of the pavement mainly depends on the macro-texture topography and micro-texture topography of the pavement surface. The macro-texture morphology generally refers to the morphology structure with a wavelength of 0.5mm-50mm and a height direction of 0.2mm-50mm. Microscopic texture refers to the te...

AI Technical Summary

Problems solved by technology

Among them, the test speed of the contact surface profiler is slow, it is only suitable for indoor detection with a limited number of points, and it is mostly used for linear measurement, and it is difficult to achieve high-precision three-dimensional shape measurement

The three-dimensional laser scanner is not only expensive, but also has a measurement accuracy of about 2mm, which is difficult to meet the measurement requirements of the microscopic texture of the road surface

The three-dimensional texture morphology of asphalt pavement based on the traditional photometric stereo algorithm has the following defects: (1) the characteristics of the asphalt pavement itself (such as: asphalt oil film and fine mineral powder, forming high light spots or noise points under light conditions; rough asphalt pavement It is easy to produce some lighting dead angles and form shadow areas) making it difficult for the traditional 3-light source photometric stereo algorithm to meet the measurement accuracy requirements; (2) The traditional photometric stereo algorithm uses 3 light sources for illumination, which cannot form full-area coverage of illumination, and inevitably produces illumination Blind areas; (3) The traditional 3-light source photometric stereo algorithm uses median filtering to denoise, which makes the image itself lose too much detail information, which has a significant impact on the reconstruction of microscopic texture morphology

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