3D Real-Scene Model of Oblique Photography Based on Retinex

The traditional 3D modeling adopts the method of manual field measurement data, which meets the accuracy required by production and construction, but the efficiency of data acquisition is too low. In order to improve the overall work efficiency, the UAV oblique photography is used in the 3D modeling. It not only liberates technicians from the hard field work, greatly reduces the field work workload, but also can quickly build 3D real-scene model, shorten the drawing period, reduce the production cost, which has a positive role in promoting the development of geographic information industry. However, in the process of UAV tilt photography, the image effect is often not very ideal due to the influence of bad weather such as uncertain rain or shine and wind and fog, and uneven illumination phenomena such as underexposure, overexposure and shadow appear, which directly affect the quality of the 3D real-scene model in the later stage. In order to eliminate this effect, Retinex method in image enhancement technology is applied to preprocess the oblique photography image to ensure the image quality, which lays a foundation for the quality of the subsequent 3D real-scene model.