Why is the location of the “fourth camera” on the iPhone given to lidar?

One, two, three, four Since 2016, the number of flagship mobile phone cameras has been increasing by about one camera per year. Some people have joked that mahjong “Batang” will be the ultimate destination of all smart phone cameras. < / P > < p > before the release of the new generation iPhone this year, many people speculated that the iPhone 12 Pro Max would be equipped with a fourth camera. Unexpectedly, the iPhone 12 Pro Series placed a lidar in the precious “fourth camera” position. The full name of lidar is light detection and Ranging, the Chinese name of lidar, is a radar system that emits a laser beam to detect the position and speed of a target. It is composed of a laser transmitter, an optical receiver, a turntable and an information processing system. It can obtain the range, azimuth, height, speed, attitude and even shape of the target, so as to detect, track and identify the target. < / P > < p > aside from technical terms, lidar on iPhone 12 is a micro device that can detect object distance and record depth information, which is about the size of a mobile phone camera. < / P > < p > at present, the lidar range given by apple is up to five meters. That is to say, the iPhone 12 Pro Series mobile phones equipped with lidar can theoretically measure and record the distance and depth information about 5 meters. < / P > < p > when it comes to estimating object distance and recording depth information, many Android manufacturers have installed TOF sensors on some models to realize these two functions. < p > < p > for example, P40 Pro has a 3D depth camera, which can sense the depth information of objects in depth, and achieve large-scale depth effect. < / P > < p > at present, most mobile phone manufacturers use itof, while lidar belongs to dtof. < / P > < p > itof “estimates” the distance from its emission to its reflection by sensing the difference between sinusoidal light signals. Lidar is a laser that measures distance directly. The signal of < / P > < p > itof is easy to be interfered. The measurement accuracy decreases with the distance, and the measurement is relatively slow, so it is suitable for ranging in centimeter range. The laser beam of lidar has strong anti-interference ability, and the measurement accuracy does not decrease with the distance in theory, so it is more suitable for long-distance ranging. < / P > < p > finally, itof is easier to be miniaturized, and dtof integration is more difficult to be miniaturized, so there are obvious differences in business scenarios between the two. Itof is mostly used on mobile phones, and dtof is more commonly used in large devices such as automobiles and UAVs. < p > < p > lidar is faster, more accurate and more distant than itof, but it is more difficult to integrate and costs more. Apple’s ability to integrate lidar into the iPhone 12 camera module must have taken some thought. < / P > < p > maybe the iPhone will become a 456 camera phone one day, but at the critical juncture of being discussed as “is iPhone photography lagging behind?” choosing to give lidar the precious “fourth camera” position is enough to show how much Apple attaches importance to the layout of the future. < / P > < p > when mobile phone photography is almost to the ceiling, Apple has chosen a different way from other manufacturers. Instead of using high pixels and multiple optical zoom, Apple has added lidar to let users record “depth information.”. < / P > < p > one is the virtualization of reality, that is, AR, which can record all kinds of information about real things with the camera system and lidar, and then display them on the screen in a virtual way to observe from any angle, which also breaks the limitation of time and space. < / P > < p > the other is virtual reality, that is, VR, which can add the information of the real dimension to the virtual things, and let the virtual things “live” the characteristics of the real things in the network. < / P > < p > these two kinds of integration are inseparable from the depth information, which is also the bridge between AR and VR. For example, teachers use AR equipment that can record depth information to shoot live teaching, and students wear VR glasses to listen to the class. Every student sees a virtual image of the teacher, but the expression and action details of the virtual image are the same, so it is difficult to use AR or VR simply A brief description. The question < / P > < p > is difficult to answer. To a small extent, it is just a convenient communication tool. To a large extent, it has a profound impact on human society. < / P > < p > at the beginning, the common demand of users is to improve the efficiency of information exchange, so the core function of mobile phones is to make calls and send short messages. The central nodes of information exchange fixed telephone, mail, fax, post and telecommunications, which are bound by lines, have been completely marginalized, and now they are only a supplementary tool in special situations. < / P > < p > next, the common demand of users is to break the information imbalance and further decentralize. Everyone wants to have their own voice, so the core function of mobile phones has become social networking, and a large number of social apps have sprung up. < / P > < p > it is precisely because Apple’s full touch screen product iPhone can accurately and efficiently solve the pain points of users’ common needs in the second stage at the right time, so that apple can beat Nokia and become the first comprehensive market player. < / P > < p > users need to further decentralize, not only to voice, but also to record and transmit their individual civilization as far as possible, so that their individual civilization can be recorded in the history of human civilization. < / P > < p > a long time ago, all living beings had no sense of historical existence, and could not master the tools to record themselves. With the advent of mobile phones, the data stored on the server has become “personal history books”. These tiny “personal history books” play an unparalleled influence and form a “great history book” of human beings—— In the common big database of human society, individuals are no longer “nameless” that can be directly ignored in history, nor is it something that can be written off with a stroke of pen. Instead, it is a vivid existence of flesh and blood in the common “great history books” of mankind. < / P > < p > now, lidar has given us a higher dimension of “writing” ability, adding in-depth information on sound, graphic images, behavior habits and other dimensions, breaking through the plane limit. < / P > < p > for ordinary users, the intuitive help brought by lidar is not very obvious at present, and it belongs to the degree of “better, no and little influence”. < / P > < p > the potential benefits it brings are very obvious. If conditions and camera App allow, every scene, every moment, every person you meet, every flower you see, every tableware you touch, and every self portrait you take can be lidar Record the depth information as like as two peas, and the data is large enough to match the sound, image and behavior habits. It can create a virtual world and virtual self in the server. It is exactly the same as the real world and the real self. Even waiting for the high technology level, it can create a real world.

  ▲ If there is a corresponding real human in the robot, then getting the in-depth information of the real person is the first step in making a robot. < / P > < p > if the technology is more advanced, the virtual self can be given a set of “human algorithm”. After a hundred years, some people will think of us, just need to enter the virtual world, and you can see a “living” us, don’t you Is it another form of immortality? Continue ReadingASMC, a lithography maker, was one of TSMC’s 14 top suppliers last year