VIDEO CAMERA SYSTEM USING LIQUID-CRYSTAL POLARIZING FILTER TO REDUCE REFLECTED LIGHT

We have been developed a video camera system using an electrically-con trollable liquid crystal polarizing filter for television program prod uction, which can quickly reduce undesirable reflected light from a wi ndow pane or watery surface, by automatically judging the polarization state of incident light from the change in video signal intensity. Mo re than 80% of linearly-polarized incident light is removable by this method for all incident polarization angles. The time required for det ecting and reducing reflected Light is approximately 0.3s in our syste m. The drastic reduction of polarized light reflected from glass and w atery surfaces was demonstrated, and object images obscured by bright reflected light were clearly captured in an instant.