In the process of three-dimensional measurement and reconstruction, the extraction of the center of line laser stripe is particularly important. Steger algorithm can not meet the real-time requirements of industry due to its huge amount of calculation. In order to solve the problem that Steger algorithm has a large amount of computation and low extraction efficiency, a line laser center extraction method based on the improved Steger algorithm flow is proposed in this paper, which is mainly used to improve the extraction efficiency of light bar center. Firstly, the image is preprocessed by filtering and morphological methods to remove noise. Secondly, the gray image is thresholded to reduce the complexity of the image. Finally, the redundancy of the algorithm is reduced by extracting the region of interest, roughly estimating the width of the light bar, and then the Steger algorithm is used to extract the center of the light bar in the region of interest. Through the analysis of experimental data, compared with the traditional Steger algorithm, the improved Steger algorithm not only inherits the excellent stability of the traditional Steger algorithm, but also effectively improves the efficiency of light stripe center extraction, laying a foundation for real-time 3D reconstruction and measurement.