Reconstruction method of three-dimensional shape of lunar surface based on single gray level image
A three-dimensional shape, grayscale image technology, applied in the field of computer simulation, can solve problems such as low efficiency and slow solution speed, and achieve the effect of reducing requirements, improving speed and efficiency, and simplifying the steps of recovery
Inactive Publication Date: 2010-12-22
THE PLA INFORMATION ENG UNIV
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[0003] The purpose of the present invention is to provide a method for reconstructing the three-dimensional shape of the lunar surface based on a single grayscale image, so as to solve the problems of slow solution speed and low efficiency of existing reconstruction methods
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[0031] The SFS algorithm calculates the reflected light intensity of the corresponding point on the surface of a three-dimensional object according to the gray value of each point on the image. The analysis of physics and geometric optics shows that the intensity of the reflected light and the surface properties of the object are related to the geometric shape of the object surface.
[0032] To display the shape of the moon surface, the gray information in the image needs to be converted into a quantity related to the geometric information of the moon. According to the Lambertian reflection law, the intensity of the diffuse light reflected from the surface of an ideal diffuse reflection object is proportional to the cosine of the angle between the incident light and the surface normal vector, namely: ,
[0033] Where Is the intensity of diffuse reflected light on the surface of the object, Is the intensity of the light source, Is the reflection coefficient of the object surface...
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The invention relates to a reconstruction method of a three-dimensional shape of a lunar surface based on a single gray level image, belonging to the technical field of computer simulation. The method comprises the following steps: firstly, extracting the gray level value information of each pixel point in the single gray level image of the lunar surface, and finding out the pixel point with the maximum gray level value; dividing the maximum gray level value by the gray level value of each pixel point in the image to acquire the cosine of the inclination angle of each pixel point; carrying out an approximate spherical hypothesis on the lunar surface to acquire the cosine of the deflection angle of each pixel point; computing the inclination angle and the deflection angle of each pixel point, then computing the surface normal vector of each pixel point, and converting the surface normal vector into the height coordinate value of each pixel point; carrying out filtering treatment; and reconstructing the three-dimensional shape of the lunar surface by utilizing the OpenGL technology according to each acquired surface normal vector and each acquired height coordinate value. The method of the invention can reduce the requirements for implementation of three-dimensional surface restoration, improve the speed and the efficiency of restoration and simplify the steps of restoration; and by using the method for carrying out treatment, the three-dimensional shape of the lunar surface can be more accurately reconstructed.
Description
technical field [0001] The invention relates to a three-dimensional shape reconstruction method of the lunar surface based on a single grayscale image, and belongs to the technical field of computer simulation. Background technique [0002] Studying the three-dimensional shape of the lunar surface by analyzing captured lunar images is one of the basic researches of lunar exploration. In the lunar exploration projects and plans of various countries, including my country's "Chang'e-1", the study of the three-dimensional topography of the lunar surface has always been in an important position. Reconstructing the three-dimensional shape of the lunar surface from images is still an important method for analyzing the three-dimensional topography of the lunar surface. Two of the six surveying equipment carried by the LRO launched by the United States in October 2008 are used to measure the lunar terrain, one of which is to take images of the moon. As early as 1951, before humans ...
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IPC IPC(8): G06T17/00G06T15/20
Inventor 李建胜徐青陈杰郝向阳蓝朝桢周杨孙伟邢帅西勤何钰卢战伟王同合
Owner THE PLA INFORMATION ENG UNIV