浑浊介质中偏振差分成像技术发展及展望(特邀)

Development and Prospects of Polarization Differential Imaging in Turbid Media(Invited)

在浑浊介质中进行光学成像时,由于受介质吸收与散射影响,目标信号被淹没在背景噪声中,导致图像的清晰度严重下降。利用光的偏振信息可显著提升浑浊介质中目标的探测能力,其中偏振差分作为代表性偏振成像技术,充分挖掘介质光与场景光的偏振特性差异对背向散射噪声实现偏振共模抑制。由于其系统结构简单、可移植性好、适用领域广泛、凸显边缘等优势备受关注。该技术不仅可以作为物理光学成像方法对水下浑浊环境、生物组织、大气雾霾散射环境中目标进行高对比度成像,还可作为光学传感器件抑制杂散光的有效手段,从提出至今已积累了大量优秀的研究成果,从偏振差分成像技术的基本原理出发,根据成像应用场景的不同从两方面介绍了该技术一系列最新的研究进展,并对偏振差分成像未来可能的发展方向进行了展望,期望为该领域的后续研究提供指引。

When optical imaging in turbid media, the target signal is drowned in the background noise due to the influence of media absorption and scattering, resulting in a serious degradation of image clarity. As a representative technique of polarization imaging, polarization differential can significantly improve the detection capability of targets in turbid media by using the polarization information of light, which fully exploits the difference in polarization characteristics between medium light and scene light to achieve polarization common-mode suppression of backscattered noise. Due to its simple system structure, good portability, wide range of applicable fields, highlighting the edge and other advantages have attracted much attention. This technology can not only be used as a physical optical imaging method for high contrast imaging of targets in underwater turbid environments, biological tissues,and atmospheric haze scattering environments, but also as an effective means to suppress stray light from optical sensor devices, and a large number of excellent research results have been accumulated since its introduction. From the basic principle of polarization differential imaging technology, according to the different imaging application scenarios, a series of recent research advances in polarization differential imaging is introduced from two aspects.And an outlook on polarization differential imaging is provided, which provides guidelines for subsequent research in this field.