Determining the quality of camera imaging depends on the quality of the lens and the size of the sensor. With the light and thin requirements of the mobile terminal device, the sensor size and the optical quality of the lens cannot be maximized. In this scenario, the second lesson is implanted. The camera to improve the image quality is a must. As early as 2011, HTC launched the first mobile phone EVO 3D (G17) to shoot 3D video dual camera, then HTC introduced the recording depth of field data to achieve "first photo One M8 with dual camera after focusing, this time, Huawei, Qiku and other domestic mobile phones have also launched the configuration of mobile phones, the advantages of different dual cameras began to become the core competitiveness.
Dual camera principle
The transition from a single camera to a dual camera can be seen as a two-dimensional to three-dimensional transition. This should be easier to understand. Two-dimensional x and y axes, such as a sketch, our overall feeling is "flat". And 3D is an additional z-axis dimension. The intuitive understanding of this z-axis is the distance from us.
To give a simple example, if you look at our eyes, it is easy to understand. The human eye is a typical binocular system. You can do a small experiment: close one eye, then hold one for each left and right hand. Pen, try to get the tip of the pen to touch, how can you not do it? We can see the same object with the left and right eyes separately, and we can clearly feel the difference of the image. This difference is the basis of our three-dimensional vision. With the difference of the left and right eye images, combined with the powerful recognition and matching ability of the brain, we can basically determine The distance of the object from us, we only open one eye in the experiment, although we can clearly see the pen in the left and right hands, but the brain can not get the depth information, so you can accurately locate in the "up, down, left and right" direction, but There is nothing in the "front and rear" direction. The generation of dual cameras is also to make up for this deficiency.
As far as bionics is concerned, many animals, including humans, have two eyes, and animals such as insects have a large number of eyes, which we call arrays. It can be said that the mobile phone from a single camera to a dual camera or array lens is the result of a natural evolution.
Returning to the mobile phone, when we take pictures, the two cameras will be the same as our eyes, each performing their own duties, one lens is responsible for image color collection, and one lens is responsible for the collection of brightness, contour and detail ISP, the latter will be The summary of the information will present a better final piece.
The advantages of each company's dual camera
At present, the application of dual cameras on mobile phones is more common. Next, let's take a look at the advantages of the dual cameras of major smartphone manufacturers.
Naked eye 3D
At first, Sharp, HTC, and LG developed a naked-eye 3D mobile phone. Capture 3D photos or videos directly from two shots of the same pixel so you can see the effect on a screen that supports naked-eye 3D display.
Depth of field assistance
TC One M8 and ZTE AXON and Red Rice Pro are representative models of this type of technology. In general, the secondary lens has a lower pixel size and is used to record depth of field information without directly affecting the quality of the shot. When shooting a sample, the dual shots work together, and a more free background blur can be achieved by means of photo synthesis.
Bionic parallel
Stepping into 2014, when domestic mobile phones were undergoing a period of innovation, the dual cameras became the "killer" for them to compete in the high-end market. Coolpad and Glory have launched the Cool Platinum and Glory 6 Plus with dual lenses. These products are different from the depth-of-field auxiliary dual-camera. The dual rear lens also has the corresponding CMOS for taking higher-pixel photos, so it is called Arranged in parallel for bionics.
Technically, this type of dual lens has a larger amount of light and a light-sensing area, and can also achieve first-time focusing and virtual aperture adjustment. However, this is also more demanding for later software synthesis algorithms.
Color black and white
On the basis of parallel double-shot, this year we are welcoming color + black and white dual-lens. Representative products are still domestic models, such as Huawei P9, Qi cool flagship version, glory 8, cool Cool1. Generally, the main lens will be equipped with a color sensor, and the sub-lens will be a black and white sensor with the same pixel. When shooting, the dual lens can work together to synthesize photos, the color lens collects the image color, and the black and white lens complements the image brightness and detail.
Wide angle assist
The dual lens can also be used in wide-angle shooting, and the representative product is the LG G5. Although it has a dual lens, the shooting part is more dependent on the main lens. The auxiliary lens is an option for wide-angle lens, suitable for shooting wide scenes outdoors. These two lenses cannot be used to improve image quality at the same time, but are used separately.
optical zoom
Corephotonic has previously demonstrated an alternative dual-lens prototype that can simultaneously capture distant and close-up shots with different focal lengths of the lens, ultimately relying on software algorithms to achieve similar effects to optical zoom. Corephotonic refers to this type of camera as a "computing camera" that allows photos to have higher resolution while also reducing noise in low light conditions. It is a pity that there is currently no corresponding product equipped with this dual lens technology.
Augmented Reality
Not long ago, Lenovo released the black technology product Phab 2 Pro. The biggest feature of this machine is that it is equipped with three lenses. The main lens is used to capture the picture, and the sub-lens is composed of a wide-angle lens and a motion capture camera. Combining multiple lenses can achieve the effects of motion tracking, depth perception, and regional learning, which is our common AR augmented reality.
to sum up
At present, the dual-camera mobile phone is mainly based on improving the quality of the photographing. Under the premise of changing the image quality, the consumer can actually experience the effect of the double lens instead of the marketing of Shantou. However, looking at the dual-lens that is currently on the market, although the amount of light and the noise control are slightly improved, this improvement is not a qualitative change. But what is certain is that this year will be a year of re-emergence of dual-lens mobile phones. The relatively mature technology development, strong support from industry giants, developers and supply chain manufacturers will drive the adoption of dual-lens mobile phones more rapidly.
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