time：2021-07-07 source：ZJ Lighting Views：165
| "0 Popular Science | Why does the LED light flash on the camera? "Stroboscopic effect" is a perceptible flicker effect, which usually occurs when the phone is facing the LED light source for shooting. Have you ever seen the stroboscopic image of a mobile phone camera when shooting with an LED light source, but it is normal when viewed directly with the naked eye? You can do a very simple experiment. Turn on your mobile phone camera and aim it at an LED light source. If your car has a fluorescent lamp, you can easily observe this strange phenomenon through the smart camera camera. In fact, the frequency of LED light source flickering is invisible the human eye. Car critics often encounter some scenes that make them crazy: When taking pictures of cars, the car turns on the fluorescent lights, and the final shooting effect will make them very frustrated. , This stroboscopic effect can be simply explained as the conflict of two lights. What is stroboscopic effect? If you look through the previous physics books, you will find that people usually have a tendency called "persistence of vision". We can continue perceive things, even if they no longer appear in front of our eyes, we can see "continuous images." , Rather than a set of discrete static images. The LED light source flickers at high frequency, which is not detectable by the naked eye. Therefore, we see that the light is on until we turn off the power completely. Similarly, a video is actually a series of images captured in rapid succession. These images are captured in units of frames per second. When we play games gether, this continuous vision can trick our brains in The above event is regarded as a continuous fluid movement. When the number of frames per second exceeds the frequency of the LED light source, the mobile phone camera presents an obvious flicker effect, which is the stroboscopic effect. The LED light will flicker when it is switched on and off quickly. Whether it flickers or not depends on the nature of the current supplied it. Under normal circumstances, the flickering frequency of LED lights is very high, which cannot be directly detected by the human eye, or invisible the naked eye. Therefore, people can rest assured that any visible camera flicker is actually a normal light operation. The only thing that should cause concern is humans. Blink of an eye. However, it is a very broad term say that LED lights are always blinking during operation. DC power supply When the DC power supply provides power the LED lamp, the DC power supply referred here is usually a battery, and the LED lamp diodes are always in a charged state. Therefore, they continuously release light energy and remain in the on state until the circuit is disconnected. When the mobile phone camera shoots LED lights powered by DC power, the screen will flash continuously. AC power AC power is usually provided by a power source such as a wall socket. In essence, AC power is turned on 2 times and turned off 3 times in a cycle. Therefore, the excited electrons consume all energy in the form of light and return the electronic housing 3 times , And then be excited again. Therefore, an LED light directly connected AC power will flicker in the video. However, it is not feasible connect the LED lamp directly an AC power source, which will cause the life of the LED lamp be significantly reduced due the cyclic switching of the on-off state. Therefore, they are connected a regular called a "driver". Before wiring them the lights, it converts AC DC, and the LED lights running through the driver will not show flicker. Pulse width modulation With the continuous development of transmission technology, the flickering of mobile phone cameras caused by LED lights is not only completely attributed AC or DC power supply, but also LED lights powered by the driver will flicker. In order reduce power consumption, the power supply can be bundled in discrete pulse currents. Instead of a continuous power supply, this is the so-called pulse width modulation, which is usually used in aumotive fluorescent lamps. Can the strobe be spped? Spping the strobe itself is very unhelpful. However, the irritating strobe effect is what we are trying eliminate. Although eliminating the strobe effect is an incredible precision task, it can easily be reduced by adjusting the frame rate and shutter speed. Except for the United States, alternating current is provided at a frequency of 50 Hz, which means that the current changes between on and off 50 times in 1 second. By adjusting the camera parameters, that is, the shutter speed and frame rate multiples or fractions of 50, the stroboscopic effect can be significantly reduced. Some LED lights are adjusted by the driver. The flicker frequency is controlled by adjusting their switching period. If the flicker rate is adjusted exceed the camera frame rate, the stroboscopic effect can be effectively eliminated. Will incandescent bulbs flicker o? Like LED lights, incandescent bulbs are switched on and off in alternating current. That is say, in the off state, the filaments in the incandescent bulbs are not sufficiently cooled, which will not have a significant effect on the mobile phone camera. Therefore, we cannot I saw the incandescent bulb flickering on the phone camera. Source: Sina Technology Shenzhen Shangzheng Lighting is a lamp manufacturer focusing on R&D and production of LED landscape lighting and outdoor lighting. It has 9 years of experience in military industry lighting services. It is located in Shenzhen Baoan. Its products cover: stadium lighting, LED sports lighting, stadium lights, LED stadium lights, High bay lights, high bay lights manufacturers, LED workshop lights, workshop LED lights, tunnel LED lights, LED tunnel lights, LED wer chandeliers, street lights, LED workshop lights, LED squares, lamps, LED lights, high pole lights, wer chandelier, LED Street lights, LED lamps, LED high pole lights, etc. For many years, our company has always put product quality in the first place. At present, the company has passed the ISO9001 international quality certification system, and the products have passed CE, ROHS, 3C and other domestic and international certifications and inspections. We insist on making cusmers feel free buy and use LED lights. Philosophy and mission, Shangzheng Lighting [Chongde Shangshan is the source of the original] look forward cooperating with you for a win-win situation! |
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