Pipeline weld joint three-dimensional reconstruction method based on single elliptical imaging radiograph
A technology of radiography and ellipse imaging, applied in 3D modeling, image analysis, image data processing, etc., can solve the problems of poor reconstruction effect and time-consuming
Active Publication Date: 2021-01-22
JIANGSU FRONTIER ELECTRIC TECH
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Problems solved by technology
This method performs three-dimensional reconstruction based on a single two-dimensional image, which solves the disadvantages of time-consuming reconstruction of a single image and poor reconstruction effect in traditional reconstruction methods
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[0063] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0064] Such as figure 1 As shown, the present invention has designed a method for three-dimensional reconstruction of pipeline welds based on a single ellipse imaging radiograph, and the method specifically includes the following steps:
[0065] Step S1: read a single pipe weld ray image, and preprocess the image to reduce the influence of image factors on the overall water wall pipe;
[0066] Step S2: Calculate the relationship between the gray scale of the weld bump and the penetration thickness of the radiation, and preliminarily estimate the penetration thickness of the radiation;
[0067] Include the following specific steps:
[0068] S2.1: During radiographic inspection of weld seams, the attenuation of rays conforms to Beer's law, and the image gray value obtained by radiographic inspection is proportional to the intensity of rays received by the imagin...
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The invention discloses a pipeline weld joint three-dimensional reconstruction method based on a single ellipse imaging radiograph. The method comprises the steps of: recognizing and segmenting a weldjoint image; reducing weld joint root forming and weld beading according to the gray difference of the weld joint and the pipe image; restoring weld joint root forming and weld beading by inverse perspective transformation according to the weld joint elliptical opening image; correcting an appearance curve of weld joint root forming and weld beading; generating a peripheral boundary curve of theweld joint area according to the weld joint root weld beading radial height curve coordinates, and performing interpolation on the through-flow surface curve and the peripheral boundary curve to obtain three-dimensional scatter points capable of representing the weld beading area; and performing gridding processing on the three-dimensional point cloud, and generating a weld beading three-dimensional model from point to surface. According to the method, three-dimensional reconstruction of the weld joint can be accurately and effectively carried out according to the radiograph of the weld jointof the single two-dimensional pipeline under the condition that the detection cost of the welding quality of the small-diameter pipe in thermal power generation or other industries is not increased, and accurate and reasonable recognition control over weld joint root weld beading with important influences on pipe through-flow is achieved.
Description
technical field [0001] The invention relates to a method for three-dimensional reconstruction of pipeline welds based on a single ellipse imaging radiograph, and belongs to the technical field of industrial fault detection automation. Background technique [0002] Energy is an important basis for the survival and development of human beings. With the increasing global energy consumption and the continuous deterioration of the global ecological environment, countries around the world are beginning to face energy and environmental issues together. Thermal power generation is one of the main ways of power supply in many countries. Improving the efficiency of thermal power generation and reducing environmental pollution is the common goal pursued by all countries in the world. Now the large-capacity supercritical boiler unit with mature technology can greatly improve the utilization rate of energy, solve the problems of power shortage and reduce environmental pollution. Therefo...
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Patent Timeline
Login to View More IPC IPC(8): G06T7/11G06T7/00G06T3/60G06T7/90G06T11/20G06T17/20
CPCG06T7/11G06T7/0004G06T11/203G06T17/205G06T7/90G06T3/604
Inventor 杨贤彪王舒涛杨庆旭万瑜杨超刘叙笔马君鹏石仁强孙震宇王立辉
Owner JIANGSU FRONTIER ELECTRIC TECH