Preventing Surreptitious Filming by Saturation Irradiation of Infrared Rays

There are two methods for detecting videos illegally recorded in theaters. One uses digital watermarks to identify on what dates and in what theaters such videos were recorded. The other method uses infrared light, which degrades such videos by using the difference between human and device sensitivities. However, neither method detects the act of recording a video. Therefore, these methods are not the best to prevent movies from being illegally recorded. Our previously proposed method uses reflected infrared light to identify places where surreptitious filming takes place (in this paper, we call a camera used for surreptitious filming a surreptitious filming camera (SFC)). This method focuses infrared light on places where surreptitious filming takes place and disrupts it. In addition, this method distinguishes camera lenses from other lenses, such as those for eyeglasses, to analyze the RGB of reflected infrared light. However, this method cannot capture reflected infrared light depending on a SFC´s location and direction. As a result, we propose using a moving infrared detection camera (IDC) to solve these problems and a method for more effectively detecting reflected infrared light.