带约束的基于样图地表纹理合成技术研究

在传统的视景仿真开发过程中,研究人员需要将海量的航空影像照片经过数字化等一系列处理变成可使用的地表纹理,映射在地形表面,生成地景数据库.此法耗费大量人力,而且地景库一经生成就不可再改变,真实性降低.提出一种新的地表纹理的生成方法,以随机生成的高度信息作为约束,不同的地表纹理单元作为样图,采用带约束的基于样图纹理合成算法合成出真实地表纹理图像.实验中,通过改变高程约束和对多种地表纹理进行组合,可以方便快速地合成高质量的二维地表纹理图像.提出的纹理合成的方法,为今后与数字地图相结合开发地景数据库,积累一定的经验.对提高视景数据库的真实性具有实际意义.

Study on the Earth's Surface Texture Synthesis Based on Constrained Samples

In the conventional development process of visual simulation, researchers should change mass aero photograph into useful earth's surface textures by a series of processing such as digitalization. Then the textures are mapped on the earth earth's surface and the earth scene data base is created. But this method consumes a lot of man power, and the earth scene data base is unchangeable after being created and the reality is reduced. A novel method for generating earth's surface textures is proposed. The randomly generated elevation information is used as restriction, and different earth's surface texture samples are as samples. So the real earth's surface texture image is synthesized by the constrained multi-sample based texture synthesis algorithm. In the experiment, by changing the height restriction or combining some of the texture samples, the 2D earth's surface texture images can be synthesized quickly and conveniently. The texture synthesis approach presented in this paper accumulates some experiences for exploring earth scene data base with digital map in the future and it has some practical effect to enhance the reality of earth scene data base.