Polarization is an important feature of electromagnetic waves, and it is another important attribute of
light in addition to wavelength, amplitude, and phase. However, the current traditional polarization
imaging equipment is complicated in structure, large in size, and heavy, and polarization splitting and
focusing imaging require two optical components to achieve, which is difficult to integrate and
miniaturize, which severely restricts the practical application of polarization imaging. The matelens can
precisely control the information of the phase, amplitude, polarization and other information of the
light, is compatible with the Complementary Metal Oxide Semiconductor (CMOS) manufacturing
process, and has great development prospects in terms of device lightweight and mass manufacturing.
Aiming at the lightweight requirements of infrared imaging lenses, this paper uses finite-difference
time-domain (FDTD) software, combining geometric phase and transmission phase to design and
simulate a silicon-based circularly polarized matelens with a working wavelength of 3um, The diameter
is 40um, the focal length f is 10um, and the method of combining three-dimensional and remote
calculation is used to reduce the simulation time and computer memory.
The traditional method of making true digital orthophoto map is orthophoto correction using digital surface model. Tall buildings will be blocked due to the displacement of image points in orthophoto correction. This paper studies the generation method of true digital orthophoto map based on 3D point cloud geometry, and completes the production of true digital orthophoto map through point cloud registration, absolute orientation, equal interval sampling, vertical projection and texture mapping. This paper studies the equal interval sampling method and vertical projection method in this process, which reduces the time of traditional methods in masking detection and repair, it has high automation.
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