According to the online statement, when there is no light indoors, we turn on the camera function of the mobile phone and take a picture around the room. If there is a red dot on the screen of the mobile phone at this time, it means that there is a camera.
the principle that the mobile phone can detect the camera: the camera function of the mobile phone can sense the infrared light that is invisible to the naked eye. What is the specific reason? Why do we have a strong red dot when we detect the camera?
Xiao Bian consulted our privacy experts on this issue, and learned that there are mainly two kinds of cameras that can be detected in dark environment: one is a white camera, which actually uses incandescent lamps to provide illumination for the camera; The other is the infrared camera, which is also the most common type on the market now. And the phenomenon of red dot appears, which involves a professional problem in the monitoring equipment industry-red storm. A red storm is a luminous tube that clearly emits infrared light, an invisible light, but when it works, it "emits" red light visible to the naked eye. The phenomenon of red storm has seriously affected the concealment of cameras, but professionals in the industry have not completely solved this problem after years of research. The phenomenon of red storm is because although infrared light is invisible, it can also produce a certain feeling when it is irradiated on the human retina in a large dose, thus becoming "visible to the naked eye". Theoretically, the naked eye can't see infrared light, but the photosensitive elements of our commonly used cameras, mobile phones and other shooting equipment can sense infrared light. If these infrared light is absorbed into the picture, it will affect the imaging quality, so usually a layer of infrared filter is set in front of the camera photosensitive element to filter out the infrared light, so that the photosensitive element can only accept visible light as much as possible. However, the infrared filtering of some devices is not thorough, so the mobile phone camera can capture some more or less.
Privacy security experts especially emphasize that the mobile phone shooting function finds the infrared light filling device, not the camera itself, and it will only work on infrared cameras that emit infrared light in the dark. As can be seen from the above, in fact, although ordinary smart phones can detect cameras with infrared light compensation devices, it is impossible for mobile phones to find cameras with special coatings or white light. Therefore, this investigation method can only be used as an auxiliary means. To achieve the best investigation effect, professional investigation equipment (such as lens detector or signal detector) should be purchased.
Wei Mi recommends an artifact from Russia: BugHunter Dvideo portable pinhole camera detector.
BugHunter Dvideo is a portable gadget, you can easily take it anywhere, and detect any hidden camera, even professional candid camera can't escape its "eyes".
BugHunter Dvideo works by detecting laser flares emitted by devices that hide lens reflections. The detector emits a powerful red laser. Once the emitted light comes into contact with the hidden camera lens, it will be reflected to the detector and form a unique light spot.
BugHunter Dvideo can search any camera lens with a distance of 5-2 meters. The device uses 28Cd ultra-bright luminous body, so the detection range is 2.5 times larger than that of similar devices. The equipment uses a current-limiting resistor, and the light-emitting device LED has a long life.
BugHunter Dvideo supports 5 working modes (blinking frequency is adjustable). Because the search result depends on the ambient light to a great extent, it can be detected effectively by adjusting the flash frequency. Here, privacy experts suggest that using higher frequency in bright rooms and using lower frequency in dark rooms will be better.
there are four green LED indicators on the front of the p>BugHunter Dvideo detector to attach the backlight, which can more effectively detect pinhole cameras based on near-field optical technology.
you only need to turn on the power supply of the equipment, and you can detect the whole room through the display screen of the built-in lens of the equipment, which is very simple to use. When you find flares displayed as luminous spots, then these spots are hidden wired or wireless hidden cameras. So easy, isn't it