Error Compensation Method of Lens Thermal Influence in Visual Measuring System
A visual measurement and error compensation technology, which is applied in image analysis, image enhancement, instruments, etc., can solve problems such as image distortion, measurement system error increase, and feature point coordinate offset
Active Publication Date: 2020-06-16
DALIAN UNIV OF TECH
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[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the existing precision compensation technology, aiming at the image distortion caused by the thermal influence of the measurement system on the forging site, which leads to the increase of the measurement system error, and to invent a compensation method for the error compensation of the lens thermal influence in the visual measurement system
In the binocular vision measurement system, considering the problem of image distortion and feature point coordinate offset due to the influence of heat on the collected image, the present invention establishes the mathematical relationship between the lens temperature and the offset error of the image point coordinates at different positions of the image Model
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[0038] The specific implementation of the present invention will be described in detail below in conjunction with the technical scheme and accompanying drawings.
[0039] figure 1 To calibrate the positions and corresponding numbers of 24 feature points in the image, 1-24 are the 1st-24th feature points respectively. Image 6 It is a flow chart of lens thermal deformation error compensation, and the specific steps of the method are as follows:
[0040] First of all, in order to understand the law of image feature point offset with temperature, 24 feature points in the image are respectively used as analysis objects to analyze the shift law of feature points when the lens temperature changes, as shown in figure 2 , 3 As shown in , 4, the three figures show the results of magnifying the offset of 24 pixels by 50 times. According to the error curve of the 24 feature point coordinate offsets in the measurement model, it can be seen that at the same temperature, the error band ...
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The lens thermal impact error compensation method in a visual measurement system of the present invention belongs to the field of computer vision detection and image detection, and particularly relates to a lens thermal impact error compensation method in a binocular vision measurement system used in a high-temperature thermal radiation environment. In this method, in the binocular vision measurement system, the binocular camera captures the image of the calibration plate in a variable temperature environment, analyzes and solves the offset model structure based on the feature point image offset, and solves the main point offset error and the initial value of the lens thermal distortion error coefficient respectively. , use the LM optimization algorithm to accurately solve all parameters, correct and compensate the image point offset error caused by thermal deformation of the lens, and obtain accurate image point coordinates of image feature points. The compensation method corrects and compensates the distorted image through the established thermal effect error compensation model, achieving accurate restoration of the distorted image, and the system measurement accuracy is significantly improved, thereby ensuring accurate measurement of the geometric parameters of the object to be processed in a high-temperature environment.
Description
technical field [0001] The invention belongs to the field of computer vision detection and image detection, in particular to a method for compensating errors caused by lens heat in a binocular vision measurement system used in a high-temperature heat radiation environment. Background technique [0002] As a non-contact measurement method with strong real-time performance and high measurement accuracy, binocular vision measurement is widely used in many fields such as industrial inspection and target recognition, especially in real-time measurement of thermal geometric dimensions in the forging process of large forgings. The advantages. Many scholars have carried out a lot of research on how to obtain high-precision measurement results. However, the main research work is currently focused on improving the calibration accuracy of the camera system and the matching accuracy of feature points, while ignoring the impact of high-temperature heat radiation of forgings on the accura...
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IPC IPC(8): G06T7/80G06T5/00
CPCG06T7/80G06T2207/20228G06T5/80
Inventor 贾振元刘阳刘巍张仁伟张洋马建伟
Owner DALIAN UNIV OF TECH