针对在雾霾天气、水下和夜间环境中获得的图像存在清晰度和对比度下降以及色彩失真等问题，提出一种使用改进型大气散射模型的双阶段图像修复方法。通过在传统的大气散射模型中引入一个全局补偿系数以得到一个改进型大气散射模型，使用该模型的双阶段图像修复方法包含两个阶段：首先，输入一张退化图像，利用改进型大气散射模型得出一张粗略的修复图像，并利用灰度世界算法求出该粗略的修复图像的反照率；其次，将反照率和第一阶段的输出图像作为输入，利用改进型大气散射模型得出最终的修复图像。实验结果表明，所提出的方法可避免图像修复的结果中存在色彩失真和色调偏暗等问题，并且具有很好的适用性，其不仅可有效实现雾霾图像去雾，也可实现水下图像修复和夜间图像增强。与当前最先进的方法相比，所提出的方法在定量和定性实验上都取得了优异的结果。

A stimulated emission depletion is capable of breaking the diffraction limit by exciting fluorescent molecules with a solid Gaussian beam and quenching the excited molecules with another donut beam through stimulated emission. The coincidence degree of these two beams in three dimensions will significantly influence the spatial resolution of the microscope. However, the conventional alignment approach based on raster scanning of gold nanoparticles by the two laser beams separately suffers from a mismatch between fluorescence and scattering modes. To circumvent the above problems, we demonstrate a fast alignment design by scanning the second beam over the fabricated sample, which is made of aggregation-induced emission (AIE) dye resin. The relative positions of solid and donut laser beams can be represented by the fluorescent AIE from the labeled spots in the dye resin. This design achieves ultra-high resolutions of 22 nm in the x/y relative displacement and 27 nm in the z relative displacement for fast spatial matching of the two laser beams. This study has potential applications in scenarios that require the spatial matching of multiple laser beams, and the field of views of different objectives, for example, in a microscope with high precision.

In this Letter, a new approach of optical tape for high capacity multilayer data storage is proposed. We show that a length of 5 cm and width of 2 cm of soft and transparent optical tape can be used for two-photon three-dimensional bit data storage. We successfully demonstrate writing and reading of six layers of data storage with a transverse bit separation of 2 μm and an axial separation of 2.5 μm in a tetraphenylethylene-doped photobleaching polymer. The fluorescence intensity is insensitive to the storage depth of the photopolymer matrix. Thus, the optical tape that we put forward in the experiment can help people realize true large data storage in the future, like magnetic tape. This method significantly paves a novel way for solving big data storage problems.