Method for removing shadow from pavement image based on illumination compensation

Abstract

The invention provides a pavement image shadow removing method based on illumination compensation, which comprises the following steps: 1, collecting two-dimensional pavement shadow image and grayscale processing the two-dimensional pavement shadow image to obtain grayscale pavement image I (i, j); I (i, j) is pretreated to obtain that pretreated pavement image Ih (i, j); 2, carrying out illumination compensation processing on that preprocess pavement image Ih (i, j) to obtain the illumination compensated image I 'h (i, j); the shadow factor C (i, j) being compensated to the pixels of the shadow region in the gray-scale road surface image I (i, j) to obtain a preliminary shadow removing image I '(i, j); 3, carrying out spline interpolation on penumbra regions of pixel point of each row andeach column in a preliminary shadow removing image I '(i, j) to obtain an interpolated image I' non (i, j); The penumbra region of the interpolated image I'non (i, j) is restored to get the pavementshadow removing image Inon (i, j). The invention completely retains the pavement texture information, adopts the illumination compensation to remove the shadow to the pavement image, and avoids the shortcomings of high cost of the crack monitoring vehicle and low crack detection accuracy of the crack detection system of the motion camera.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a method for removing shadows of road surface images based on illumination compensation. Background technique [0002] As an important infrastructure for the development of the national economy, highways have broad prospects for development in the country's transportation system. They play a very important role in the development of goods production and transportation, close international exchanges, convenience for people's lives, prosperity of urban and rural economies, and consolidation of national defense. . [0003] After the road is put into use, due to the influence of various environmental factors such as large-scale vehicles, serious overloading, and rain and snow, various damage phenomena will appear during the use of the road, such as cracks, potholes, ruts, etc. , and cracks are the most common type of damage. With the vigorous development of microelectron...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for removing shadows of road surface images based on illumination compensation, so as to solve the problem that the existing technology has poor effect of removing shadows on road surface images and cannot fully retain the texture information of shadow areas. The problem

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