Patent ID: 11972596
Assignee: CHANGCHUN UNIVERSITY OF SCIENCE AND TECHNOLOGY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 5:
6. The method of claim 1, wherein:
the near-infrared imaging unit II comprises a near-infrared light filter, a liquid crystal phase retarder III, a liquid crystal phase retarder IV, and a near-infrared camera,
the near-infrared light filter, the liquid crystal phase retarder III, the liquid crystal phase retarder IV, and the near-infrared camera, are arranged on the same optical axis and are connected in series, and
near-infrared light intensity imaging and near-infrared light polarization imaging are completed on the near-infrared light imaging unit II after light sequentially passes through the near-infrared light filter, the liquid crystal phase retarder III, the liquid crystal phase retarder IV, and the near-infrared camera.