A method for reconstruct a virtual scene light source based on a single night scene image of a building

Abstract

A method for reconstruct a virtual scene light source based on a single night scene image of a building is characterized in that the input is a building 3D model and its corresponding real night sceneimage, the output is a set of light source parameters such that the rendering effect of the 3D model corresponding to the building under the action of the set of light sources is similar to the inputimage, and includes the following steps of calibrating camera parameters, clustering a surface visible point of that model according to pixel similarity information, then assigning a virtual light source to each set of visible points, according to the given shading model, setting the initial values of light source parameters, and then optimizing the position and color information of the light source iteratively, and then fixing the position and color of the light source and updating the color intensity value by global optimization, so as to deal with the interaction of the light sources between the groups; and finally finding a symmetrical plane by considering the symmetry of the model and the asymmetry of the light source distribution, and generating the light source on the invisible side of the model.

Description

technical field [0001] The invention belongs to the technical field of virtual light source reconstruction, and in particular relates to a method for reconstructing a virtual scene light source based on a single night scene image of a building. Background technique [0002] The increasing complexity of virtual worlds and the increasing user expectations for realism and level of detail pose high challenges for content creation. Virtual scene modeling has always been one of the important research directions of virtual reality. With the continuous development of computer vision, measurement photography, computer graphics and other technologies, as well as the continuous update of hardware geometric information acquisition equipment such as measurement and scanning, the shapes of objects that people can geometrically model are becoming more and more complex, and the scale of scenes is becoming more and more complex. bigger. These established 3D geometric models are rich in det...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the disadvantage of lighting design using the sketch system is that the operation is complicated, and it is difficult for designers to manually design an ideal lighting effect

Lighting designs that use high-level descriptions (such as gradient, edge, variance, mean, histogram, etc.) are often inaccurate and unintuitive

Shadow feature-guided lighting design is not suitable for scenes with a large number of light sources

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