基于改进分段仿射直方图均衡化算法的倾斜摄影三维模型匀色OA

In the production of three-dimensional models generated from oblique photography,color inconsistencies com-monly exist among multi-temporal models of the same area due to various objective conditions,significantly affecting the visual effect and application value of the model.To address this issue,this paper proposed a color harmonization method for three-dimensional models from oblique photography based on an improved piecewise affine equalization(IPAE)algorithm.By extending the IPAE algorithm,originally designed for color harmonization of two-dimensional images,to the texture space of three-dimensional models from oblique photography and leveraging the tile-based structure of model data,global illumination and color were collaboratively optimized.By using three-dimensional models from oblique photography cover-ing a 24-square-kilometer area in Guichi District,Chizhou City,Anhui Province,as experimental data,comparative tests were conducted using the Wallis algorithm,the piecewise affine equalization(PAE)algorithm,and the IPAE algorithm.The results demonstrate that the model processed with the IPAE algorithm achieves overall color harmonization,natural color transitions between tiles,and enhanced details in dark areas while controlling noise and quantization artifacts.Moreover,it yields optimal color harmonization results across different types of ground objects,demonstrates strong adaptability and prac-ticality,and can provide reliable technical support for the color harmonization of three-dimensional models from oblique pho-togrammetry.