A staggered three-dimensional filtering method and system based on bimodal pavement depth histogram

Abstract

The invention discloses a three-dimensional filtering algorithm and system for the faulting of slab ends on the basis of a depth histogram of a double-peak road surface. The three-dimensional filtering algorithm comprises the following steps: inputting the data matrix, acquired by an image acquisition device, of a three-dimensional image of the road surface in a computer; denoising the data matrix of the three-dimensional image of the road surface; obtaining the depth histogram of the road surface according to the denoised data matrix of the three-dimensional image of the road surface; acquiring two peak points of the depth histogram of the road surface and filtering data ranges corresponding to the peak points; calculating an average value so as to serve as filtered depth data on the depth histogram of the road surface; obtaining a filtered depth histogram of the road surface. The three-dimensional filtering algorithm disclosed by the invention has the advantages that the algorithm complexity is low, the operation time is short, and manual participation is not needed. According to the three-dimensional filtering algorithm, the idea of mathematical statistics is adopted, only the acquired data of the three-dimensional image of the cement concrete road surface needs to be input, and the detection of the amount of the faulting of slab ends can be completed, therefore, the three-dimensional filtering algorithm is high in efficiency and precise in detection.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a staggered three-dimensional filtering algorithm based on a bimodal road surface depth histogram. Background technique [0002] The filtering of the 3D data of cement concrete staggering refers to the use of a specific filtering algorithm to filter the collected 3D data of pavement staggering, so as to ensure the accuracy of subsequent calculation of the amount of staggering. Cement concrete pavement is a rigid pavement. Compared with flexible asphalt pavement, the pavement disease of staggered platform is more common on cement concrete pavement. The main reasons are: (1) The roadbed base is not compacted and the strength is insufficient, As a result, the plastic cumulative displacement of the base layer occurs under the action of traffic load; (2) the local foundation subsides unevenly; (3) the load transfer capacity between adjacent slabs decreases; (4) water soaks ...

AI Technical Summary

Problems solved by technology

The mean filter will increase the blurring of the two-dimensional image, which is equivalent to using the actual principle that the number of target data is much larger than the noise data to smooth the noise data. Cocklebur achieves the purpose of filtering, which does not fundamentally remove the noise data , will inevitably produce blur; the effect of median filtering on similar step noises such as salt and pepper noise is better, but its effect depends on the size of the filtering template. Not very ideal; mathematical morphology filtering technology completes the filtering of images by moving structural elements from a geometric point of view, and after filtering, part of the data information will be lost or redundant information will be generated; in addition, the above filtering algorithms are all for two-dimensional images. There is no mature filtering algorithm for 3D data, and 3D data can better reflect the characteristics of the actual road surface.

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