High-reflection part measurement method and system based on improved Phong model
A measurement method and high-reflection technology, applied in the field of measuring instruments, to achieve the effect of improving extraction accuracy, improving precision, and avoiding high-reflection phenomena
Active Publication Date: 2022-04-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0004]
The object of the present invention is to aim at the problem of high reflection in the process of workpiece measurement, and propose a method and system for measuring highly reflective parts based on the improved Phong model, which can effectively avoid the problem of high reflection in workpiece measurement and effectively improve the extraction accuracy of the center coordinates of laser stripes , so as to improve the workpiece measurement accuracy
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[0055] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.
[0056] figure 1 It is the overall structural diagram of the present invention, such as figure 1 As shown, the system device applied by the present invention includes an operating platform (not shown in the figure), on which the first industrial robot 1, the second industrial robot 4, the part to be tested 5 are placed, and the first industrial robot 1 end effector A wired structured light laser 2 is connected to the top, and an area-array industrial camera 3 is connected to the end effector of the second industrial robot 4; the first industrial robot 1 has 6 degrees of freedom and can control the linear structured light laser 2 to move in any space. The industrial robot 4 has 6 degrees of freedom, and controls the area array industrial camera 3 to perform any industrial camera movement in any space;
[00...
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The invention discloses a high-reflection part measurement method based on an improved Phong model, and discloses a measurement system adopting the high-reflection part measurement method based on the improved Phong model. According to the method, the to-be-measured curved surface CAD model is mapped into the two-dimensional parameter domain and then is re-mapped into the to-be-measured curved surface CAD model to obtain the scanning path points, then the mirror reflection direction is solved according to the improved Phong reflection model, the pose of the industrial camera is adjusted according to the mirror reflection direction, and the accuracy of the measurement is improved. Therefore, the high-reflection phenomenon of the surface of the to-be-measured part in the measurement process can be effectively avoided, the laser stripe extraction precision is improved, and the precision of measurement data of the high-reflection part is effectively improved.
Description
technical field [0001] The present application relates to the field of measuring instruments, in particular to a method and system for measuring highly reflective parts based on an improved Phong model. Background technique [0002] With the rapid development of modern manufacturing industry, the designed workpiece tends to become more and more complex, and the requirements for the machining accuracy of the workpiece are also getting higher and higher, which also puts forward higher requirements for the measurement accuracy of the workpiece. At present, there are a large number of workpieces that are highly reflective, such as aeroengine blades, car bodies, etc. When optical measurement is used to measure such workpieces, the surface of the workpiece is smooth, resulting in high reflective phenomena, which are not conducive to The measurement of the workpiece surface greatly increases the difficulty of measuring the workpiece surface and greatly reduces the measurement accur...
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IPC IPC(8): G01B11/25G06F17/15
Inventor 于连栋陈晨贾华坤陈浩涵李京效陆洋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)