混合反射光场偏折术

大型高反射自由曲面的无损，高精度测量是三维测量领域的重要科学问题，其具有高表面光洁度，零损伤要求，混合反射表面特性（镜面反射和漫反射），面型复杂，零件尺寸较大，需要多次测量的特点。本项目从高反射曲面的混合反射光场恢复混合法线，通过对同源法线场融合恢复三维信息，提出全新的混合反射光场偏折术。通过研究光场传递及变换准则，建立调制函数表达，揭示混合反射光场偏折术的法线场调制及恢复机理；研究光场的编码方法，解码确定光场对应性，实现混合光场系统的参数标定；研究混合法线场融合和四维法线场积分方法，实现多视角光场信息融合；针对太空天线反射面的在线测量开展应用研究。该项目将揭示偏折术中光线传播、反射和接收的光场本质，形成全新的混合反射光场偏折术方法体系，是对高反射自由曲面光学测量理论的进一步完善和补充，有望促进相关应用行业的发展和进步。

It is an important problem to precisely obtain the range information of specular free-form surfaces. Because specular free-form surfaces own the characters of high surface finishment, complexed reflectivity and large size, it is a great challenge in the field of 3D measurement. This project explores a new method for measuring specular surfaces based on light field theorem. We call it deflectometry with mixed reflection of light field,, which acquires 3D information from the reflected light field. The coded light field is generated with a multilayer mask system. The light in it is transmitted onto the surface and reflected. The reflected light field is captured using a multimodal light field camera. The 3D information of the surface is in the reflected light field in a special manner, and the mechanism of the light field is the key to restore the information. Thus, the multiplexing theorem of the light field is studied firstly. A general model would be developed to depict the process of multiplexing the dimensions (such as time, space and frequency) of the plenoptic function onto an image. Based on this theory, the mechanisms of light field imaging and the principle of light field recovery will be studied respectively. The light can be determined from its position and direction, when the relationship between the out light field and inner light field is calibrated. After that, the code strategy of the input light field and the decoding method are studied to determine the correspondence of between the input light field and the reflected light field. Finally, the surface is obtained from the norm results through optimizing the energy of light field. In a word, this project provides a new perspective of measuring specular surfaces and is the supplement of the traditional theory based on light reflection. A variety of innovative research results are expect and can be demonstrate superior application in related areas.