自然场景光场成像中非干涉确定性相位恢复研究

项目名称： 自然场景光场成像中非干涉确定性相位恢复研究

项目编号： No.61301296

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 程鸿

作者单位： 安徽大学

项目金额： 25万元

中文摘要： 光场的振荡频率极高，常规光学传感器只能直接记录光场强度，因此包含物体形状细节和深度等更重要信息的相位只能从强度测量中恢复。经典的非干涉确定性相位恢复技术通过求解强度传输方程从强度中恢复相位，在相干光场中获得了广泛的应用，但该方法仅适用于相干、单波长情形。具有非相干和多波长特性的自然场景的光场相位恢复问题仍具有挑战性。 本项目拟构建自然光场相位恢复理论分析、数值计算和实验体系的整体框架。首先拟采用更为严格的非傍轴理论描述非相干照明下自然场景聚焦平面附近光场特性，构建新的描述强度和相位关系的微分方程；然后结合Green函数理论探讨多波长情况下相位解缠的物理原理；再用多强度测量结合高阶导数改进原有计算强度偏导数的处理方式，以提高算法的抗噪声能力；同时突破均匀照明近似约束，寻找更有效的相位计算方程数值求解方法。该研究将为全光场重构、军事、防御（如伪装的识别、隐蔽测距）等方面提供新的技术支持。

中文关键词： 相位恢复；自然场景；强度传输方程；压缩成像；三维重构

英文摘要： Conventional optical sensors can only record the intensity of the light field directly because of the high oscillation frequency, and therefore phase which contains more important information including object shape detail and depth is only recovered from intensity measurements. The transport of intensity equation on paraxial approximation is solved to recover the phase information in classic non-interference deterministic phase retrieval technology. This technology is widely used in the coherent field, but only consider coherent and single wavelength circumstances. Phase retrieval issues of natural light field with incoherent and multi-wavelength characteristics remains challenging. This project will build the overall framework including theoretical analysis, numerical solution and experimental system of phase retrieval in natural light field .We will adopt more stringent nonparaxial theory to describe optical field characteristics near focal plane in natural scene under incoherent illumination, and construct new differential equation describing the intensity and phase relations. Then explore the physical principles phase unwrapping physics of multi-wavelength case based on Green function theory.We will use more intensity measurements with high order derivatives to improve the original intensity differential ap

英文关键词： Phase retrieval；Natural scenes；Transport of intensity equation；Compressive imaging；3D reconstruction