基于激光三角法的光斑中心定位技术研究OA

Aiming at the problem of precise positioning of the spot center in the laser triangulation displacement measurement system,based on the existing spot center positioning technology,a Gaussian adaptive spot precise positioning method is proposed to improve the measurement accuracy,stability and adaptability of the system and achieve sub-pixel-level precise positioning of the spot center of the target point.The method adopts a three-layer architecture of"preprocessing-coarse positioning-fine positioning".The image is preprocessed.The background light noise is eliminated through the difference method,and a smooth target light spot image is obtained by combining Gaussian filtering and iterative threshold method,providing a good foundation for the subsequent positioning link.The first-order central difference method is adopted to perform pixel-level positioning of the image point light spot to quickly determine the initial position of the light spot.The weighted least square method is introduced for linear fitting.The introduction of the weight matrix enhances the contribution of the pixel points close to the center of the light spot,effectively improving the positioning accuracy of the center of the light spot and meeting the positioning requirements at the sub-pixel level.The root mean square of the absolute error of this positioning method is approximately 0.18 pixels.Compared with the Gaussian fitting method,when the accuracy is comparable,the stability is improved by 10.5%.This method not only ensures the high-precision positioning of the light spot center,but also improves the computational efficiency and enhances the adaptability of the system.