How to shoot a person's face after the room suddenly turns off the light at night? Can this camera take such a picture?

A camera with night vision can take clear images even without any light, which is the kind of effect you see in movies with night vision. Now many machines claim to have night vision, so what is night vision? As the name implies, the so-called night vision function means that a digital camera can shoot images visible to the naked eye even when the light is very dark or even completely absent.

At first glance, this function is very practical, because we often encounter insufficient light when shooting. If the "night vision" function is really so magical, then we can really save a lot of effort when shooting. It is very troublesome to fill the light when shooting, but is this really the case? It's not too late to draw a conclusion after listening to the tiger's analysis for you slowly. At present, Sony, Panasonic and JVC are three Japanese brands with great influence in the field of digital cameras in China. Sony and Panasonic are the main brands of digital cameras. The two manufacturers have been in this field for a long time, and have their own unique technology and perfect system in production and sales. JVC is also an old brand, which has a large number of consumers in Japan and Europe, but its sales in China have not been very satisfactory, but this does not affect the inherent quality of JVC digital cameras. Many patented technologies of digital cameras were first proposed by JVC, such as "the treasure in the palm of your hand".

The digital cameras produced by these three manufacturers all have night vision functions-Sony's infrared night vision and ultra-infrared night vision, Panasonic's color night vision function, and JVC's color digital night vision. Although they are all shooting methods in dark environment, they are different. Let's look at it one by one:

First, Sony's "infrared night shooting function" and "ultra-infrared night shooting function"

Sony is a well-deserved overlord in the field of digital cameras, with a market share of over 50%. Sony has the world's top digital image research and development institutions and superb technicians, the most complete product line and excellent electronic design capabilities. Sony's biggest advantage in this field is the core technology of digital cameras, which ensures the excellent quality of products. The "night vision" mode of Sony digital camera is "infrared night shooting". So let's first understand what is infrared.

The visible light that human eyes can see is arranged from long to short wavelength, which is red, orange, yellow, green, cyan, blue and purple in turn. The wavelength range of red light is 0.62 ~ 0.76 micron; The wavelength range of violet light is 0.38 ~ 0.46 μ m, the light with shorter wavelength than violet light is called ultraviolet light, and the light with longer wavelength than red light is called infrared light, which is invisible to naked eyes. Because digital cameras use CCD to sense all light (visible light, infrared light, ultraviolet light, etc.). ), the image taken is very different from the image produced by our naked eyes only seeing visible light. In order to solve this problem, the digital camera is equipped with an infrared filter between the lens and the CCD, whose function is to prevent infrared rays from entering the CCD, so that the CCD can only perceive visible light, and the images taken by the digital camera are consistent with those seen by our naked eyes.

Infrared night vision means that in the night vision state, the digital camera will emit infrared rays invisible to the naked eye to illuminate the subject, and turn off the infrared filter to stop the infrared rays from entering the CCD. After the infrared ray is reflected by the object, it enters the lens for imaging. At this time, what we see is an image reflected by infrared rays, not by visible light, which means that we can shoot an image that is invisible to the naked eye in a dark environment.

Sony digital camera pioneered the infrared night shooting function, which can shoot in a completely black environment, and even objects that cannot be distinguished by the naked eye can now be photographed clearly. The characteristic of this kind of night vision is that it can be shot without light at all, but because infrared photography is adopted, the color cannot be restored, so the shot picture is monochrome and the image will turn green. Soon after, Sony introduced a digital camera with infrared night shooting function. The slow shutter of infrared night shooting function is a two-stage selection, and the slow shutter of ultra-infrared night shooting function is automatically adjusted, which can obtain better image effect. For example, when the United States attacked Iraq, most parts of the Iraqi capital were in a state of power failure. At this time, in addition to the fire caused by air defense tracer and missile explosion, only moonlight or starlight shines, and the visibility is extremely poor. The pictures of the videos we saw from the scene on TV news are all green, which shows that TV reporters used infrared night vision equipment when shooting, which led to the green picture. If we don't use infrared camera technology, then we will only hear the sound from the TV picture and see no influence.

I hope I can help you, and I hope to adopt it!