In order to solve the problem of panoramic stitching of combined building facade images, the illuminance at the junction is reduced, resulting in the problem of vignetting, the author proposes a vignetting correction method based on 3D laser virtual imaging technology for surface fitting of modular buildings. By calculating the corner points, analyzing the correlation between the image coordinate system and the world coordinate system, obtaining the unit coordinate data of the corner points in the world coordinate system, and constructing a combined three-dimensional interactive model of the camera imaging; The ORB feature matching algorithm is used to perform image matching, by decomposing the homography matrix, the projection transformation matrix, rotation matrix and translation matrix of the camera's internal parameters are calculated, and the cylindrical coordinate projection method is used to complete the panoramic stitching of building facade images; Using the image grayscale correction method based on two-dimensional surface fitting, calculate the correlation coefficient of the Hesse matrix, and use the Hesse matrix to iteratively converge, obtain 2D surface parameter values to eliminate image vignetting. Simulation results show: The vignetting correction time of the combined building facade panoramic image using the vignetting correction method of surface fitting, compared with the common vignetting correction method, the vignetting correction time of the combined building facade panoramic image is shorter, and it is stable at about 5 seconds. Conclusion: The proposed method can effectively correct the vignetting of the combined building facade panoramic image, and the gray distribution of the corrected image is uniform, which shortens the image vignetting correction time.
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