Lens thermal effect error compensation method in vision measurement system
A visual measurement and error compensation technology, applied in image data processing, instruments, calculations, etc., can solve problems such as image distortion, measurement system error increase, and feature point coordinate offset
Active Publication Date: 2018-12-11
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. Figure 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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A lens thermal effect error compensation method in a vision measurement system belongs to the field of compute vision detection and image detection, and the invention in particular relates to a lens thermal effect error compensation method in a binocular vision measurement system used in a high-temperature thermal radiation environment. In a binocular vision measurement system, a binocular cameracaptures a calibration board image under a variable temperature environment, according to the characteristic point image migration analysis and the solution migration model structure, the main point migration error and the lens thermal distortion error coefficient initial value are respectively solved, all parameters are accurately solved through the LM optimization algorithm, the image point migration error caused by the lens thermal distortion is corrected and compensated, and the accurate image point coordinates of the image characteristic point are obtained. The compensation method realizes the accurate restoration of the distorted image through the heat effect error compensation model, and the system measurement accuracy is significantly improved, so the accurate measurement of the geometric parameters of the object under the high temperature environment is ensured.
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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Login to View More 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