Research on polarization detection in a strong backlight scenario based on LC-SLM

To address the issue of insufficient imaging contrast in strong backlight environments, this paper proposes a dynamic light field modulation method based on liquid crystal spatial light modulator (LC-SLM) and dual-polarization system. This system constructs a cross-scale polarization filtering coupling model. By precisely controlling the transmittance of LC-SLM with voltage and dynamically adjusting the angle between the dual-polarization plates, the incident light field can be dynamically regulated. Experimental results show that in three different brightness conditions, the method proposed in this paper significantly outperforms traditional imaging and dual-polarization imaging methods in terms of image contrast and detail resolution. Specifically, the contrast of intensity imaging is respectively improved by an average of 51%, 31%, and 17% compared to traditional methods, and the contrast of polarization imaging is respectively improved by an average of 85%, 83%, and 62%. In terms of target detail resolution, intensity imaging is respectively improved by an average of 278%, 452%, and 309% compared to traditional methods, and polarization imaging is respectively improved by an average of 153%, 606%, and 568%. This research provides an innovative technical approach for solving the problem of high-contrast imaging in strong backlight environments and has important application value in intelligent driving, remote sensing mapping, and other fields.