Detection and identification device and system for cinema bootlegging equipment based on diffraction phenomenon

Abstract

The invention provides a detection and identification device and system for cinema bootlegging equipment based on the diffraction phenomenon. The device comprises a laser, a transmitting and receivingcommon-aperture optical path, a beam splitting optical system and an image sensor. The beam splitting system is composed of a concave lens L1 and a convex lens L2. The transmitting and receiving common-aperture optical path is composed of a polarizer OP1, a polarization beam splitting prism and a lambda / 4 wave plate. The position relations of the components are as follows: the concave lens L1, the polarizer OP1, the polarization beam splitting prism, the 1 / 4 wave plate and the convex lens L2 are arranged in turn along the emission direction of laser; the image sensor is located on the reflection optical path of the polarization beam splitting prism; and the image sensor receives the reflected echo of a target and determines whether there is bootlegging equipment in a cinema according to whether there is a diffraction phenomenon on a collected image. By using the device, long-distance and large-field-of-view detection without dead angle can be realized, the laser can reach the eye safety level, the false alarm rate can be reduced, and the probability of accurate identification can be improved.

Description

technical field [0001] The invention belongs to the technical field of laser active detection and imaging, and in particular relates to a detection and identification device and system for theater bootleg equipment based on diffraction phenomena. Background technique [0002] With the miniaturization of cameras, the camouflage methods of cameras are more concealed, and the illegal use of cameras to obtain privacy and steal secrets emerges in an endless stream. Especially for movies, piracy is a serious problem in the movie industry, sometimes a movie is pirated during its premiere screening and released on the Internet during its release, people can download the pirated movie online and watch it at home for free, Instead of going to a movie theater to buy a ticket, the act of piracy has caused significant economic losses to the film studio and violated the copyright of the film company. Movie companies try to combat this illegal piracy in several ways: 1) anti-piracy groups...

AI Technical Summary

Problems solved by technology

But at present, this technology also faces two major problems: one is that the anti-sneak shooting device may receive an error signal from an unstable light source, thereby making a wrong judgment; camera doesn't work

If the sneak shooter installs an infrared filter on the camera to shoot, it will cause the sneak shot video itself to be blurred

Therefore, these methods are not fully applicable to the detection of illegal footage in an environment such as a theater

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