Research on Multi-Source Image Fusion Technology in the Digital Reconstruction of Classical Garden and Ancient Buildings

3D models of real-world scenes have become an important new tool in China, with widespread applications in cultural heritage preservation and restoration of ancient villages. However, due to the diverse and complex classical architectural forms and layout design in traditional Chinese gardens, the reconstruction of sophisticated digital models is challenging, and the integration of interior and exterior architectural models is unsatisfactory. In this paper, taking the architectural group model in Li's Manor, a major historical and cultural site protected at the national level in Lichuan City, Hubei Province, as an example, a spatial point cloud was generated by using oblique photography technology and virtual control points to accurately fuse multi-source image data, and a 3D model of indoor and outdoor real scenes of complex ancient buildings was constructed, to establish the entire real-scene 3D model of the manor and its garden. The technical solution can effectively fuse image data from different data sources and different resolutions organically, thus improving the precision and accuracy of the images and reducing blurring and distortion of the images. By fusing images from multiple sources, data duplication can be reduced, data storage can be reduced, and the efficiency of data utilisation and the accuracy of analysis results can be improved. With the approach, the cost of equipment use will be reduced, the efficiency of data acquisition will improve, and a reference for the reconstruction of complex digital models of ancient gardens can be provided.