First of all, let's take a look at the low-light night vision technology used in the first few sessions of the Call of Duty.
In this department, the player as a member of the special forces unit, with the squad deep in the enemy to rescue an important hostage. Into the game, presented in front of the player is a large area of ​​wetlands and several teammates, then the game is indifferent to the sky, players must wear night vision in the game to see the goal. After wearing the night vision device, it is a yellow-green world in front of the night, which is the effect of low-light night vision imaging.
The low-light night vision device, as the name implies, is a technique that uses the visible light (external light, moonlight, etc.) of the external environment for imaging. It is mainly used in night-vision devices used in military operations, and also used in some high-end video surveillance devices. Inside the instrument there is a light amplification device that amplifies the faint light of the natural world to achieve an observable effect by the human eye.
Explore the practical application of security technology from the game call of duty
Low light technology
So why is the color of its image yellow-green? This is due to the fact that the core component of the LLL night vision device is an image enhancement tube. This is an electron tube. Its role is to convert weak light into an electron beam, and to enhance the amplification and then bombard the phosphor. This is the afterglow of the phosphor. The characteristics are strictly required (to be much longer than the afterglow time of the picture tube), the afterglow time is short, the image will flicker, the afterglow time is long, and the smear will appear. Therefore, only this special zinc sulfide phosphor can be used to satisfy the requirement. Requirements, and this sulphide phosphor is made of green light.
Low-light imaging
In the game, we can clearly see that the gun of the assault rifle has a light pointing straight ahead. This is a laser sighting device used for nighttime gun sighting. In normal times, the laser is observed with the naked eye, and only one laser spot can be seen on the target, or a few laser light afterglows. However, by observing the low-light night vision instrument, the direct trajectory of the entire laser light can be clearly seen. This shows that the low-light night vision device is very sensitive to visible light. At the same time, it also showed its weaknesses.
When a low-light night vision device encounters strong light (such as a car lamp), observation will be greatly affected, and the observation effect inside the instrument will be a white light, which will make people feel dizzy. This is a halo phenomenon. In a place where there is no natural light at all, the low-light level night vision instrument is ineffective. And under the influence of external conditions such as smoke and storm, its observation effect will be greatly reduced.
Passive infrared technology
Next, let's analyze the thermal imaging technology that appears in Call of Duty 7.
In this department, more advanced equipment has entered the player's field of vision, of which thermal imaging technology can be described as emerging.
At the end of the rescue of the oil drilling hostage, the player attacked the oil drilling platform. In the face of our powerful offensive, the enemy began to cast smoke to cover. At this time, it was impossible to see the surrounding targets by visually observing the smoke of the day. At this time, the player can pick up a sniper rifle on the ground and open the high-powered standard mirror, which is a red world. That's right, this is thermal imaging.
Thermal imaging
Thermal imaging technology is a passive infrared technology, and is currently the main force of passive infrared technology. It mainly performs imaging by collecting infrared light emitted by human body heat. At the back of the lens, we can completely see the human condition, but we can't see the human face. This is why thermal imaging technology has been difficult to enter the field of video surveillance.
Why is thermal imaging red and obscure when observing? The reason is that thermal imaging technology is relative to active infrared technology (common surveillance cameras use this technology). It does not emit infrared light sources itself, but collects the infrared light sources released by the objects themselves (we know that general objects have infrared light). That is, the instrument is exposed to strong infrared light, and the resulting image is naturally red.
Thermal imaging technology has a strong adaptability to the environment and can be observed under severe weather conditions such as strong light, sandstorm, and heavy fog. It is not a complete night-time observation technique. There are also many examples of harsh environment observations applied during the day. However, one problem in video surveillance is that it cannot see people's faces. This poses some difficulties for the investigation and evidence collection. If thermal imaging is used in one place, it must be equipped with a strong emergency response department. When the invasion was observed, security personnel were immediately dispatched to take security measures. At present, foreign manufacturers such as Axis have begun to apply thermal imaging technology to video surveillance.
Active Infrared Technology
Again, we analyze the active infrared technology that appears in Call of Duty 7.
In this pass, the player will pilot the U2 high-altitude reconnaissance aircraft on the ground to conduct the command of the ground squad so as to achieve the purpose of assaulting the enemy's headquarters.
At the beginning of the game, the player flies to the sky and displays a black and white investigation effect picture on the frequency display. The player can clearly see several white human eyes on the black-and-white screen. Give them instructions through the keyboard and tell them where the enemy is. The night vision technology applied here is active infrared technology.
Active infrared night view
Active infrared technology, as the name implies, is a technique for nighttime imaging by actively emitting infrared light. It has been widely used in video surveillance and is the most widely used technology in the field of video surveillance. In terms of imaging, its images are black and white, the imaging effect is good, and the imaging is stable. At present, surveillance cameras in supermarkets all have infrared lights, and all use active infrared technology.
So why is it black and white? Mainly because at night, the black-and-white picture after infrared night vision is the best for clearest night vision. The colored image will deviate from the original effect of the object due to light and other reasons, while the black and white images will have less color loss.
Active infrared technology is currently the most widely used night vision technology, but due to its large power consumption, it is not easy to observe hidden objects and other reasons. In today's energy saving and environmental protection, it has gradually been replaced by other technologies.
Heartbeat detection technology
Finally, let's talk about life detection technology in Call of Duty 6.
In this pass, the player is required to perform a "climbing exercise" as soon as he enters the game, and sneak into the enemy base with the captain in the ice and snow. After climbing the cliff, a great storm hit. Players can't see anything clearly in the heavy snow weather. At this time, the captain asked you to open a device on the gun. From the device, we can see that our position is in the center of the dial. When someone approaches, the dial will show the enemy's position and the number of people. Take a small white point as a record. This is the legendary life detection technology.
Explore the practical application of security technology from the game call of duty
Today's life detection technology mainly determines the position of a person by detecting a person's heartbeat. The principle of wave phase superposition is used to determine the approximate azimuth and the number of wave sources. As the military can detect the target heartbeat behind the wall and in the bunker, but cannot identify the type and attribute of the target, and it needs to be judged by combining other information.
In the war, it can detect the target position beyond the line of sight, so that you can know where the other is without visual observation. This is the simplest single soldier detection system. In the field of security, life detection systems have been widely used in the field of security and rescue. In the rescue operations such as landslides and coal mine gas explosions that cannot enter the accident, equipment based on this technology can be seen.
However, even the best equipment has its drawbacks. The heartbeat detection technology cannot identify the detection target attribute firstly. It is difficult for the opponent to be clearly distinguishable. In addition, in the rescue, the heartbeat frequency easily receives interference from surrounding personnel, etc., which are all problems to be solved.
Be good at observing life to find fun.
As a veteran game player and also a security industry practitioner, I often like to explore some of the details of the security technology involved in the game. I share my life with each and every reader and hope that everyone will feel the joy of gaming and security with me.
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