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 2:
3. The method of claim 1, wherein when the near-infrared imaging unit is selected:
a laser passes through a near-infrared filter, a liquid crystal phase retarder III, a liquid crystal phase retarder IV, and a near-infrared camera in sequence,
intensity images and the 0-degree, 45-degree, 90-degree, and 135-degree linear polarization and circular polarization images are obtained by adjusting the liquid crystal phase retarder III and the liquid crystal phase retarder IV, and
the information processing subsystem selects the intensity images or the polarization images and transmits the intensity images or the polarization images to the image processing subsystem.