What's the use of dual cameras in mobile phones?

Application of dual cameras in mobile phones

1, naked eye 3D

At first, Sharp, HTC and LG successively developed naked-eye 3D mobile phones. Shooting a 3D photo or video directly through two lenses with the same pixel can watch the effect on the screen that supports naked-eye 3D display.

2. Depth of field assistance

TC One M8, ZTE AXON and Red Rice Pro are all representative models of this kind of technology. Generally speaking, the pixel of the auxiliary lens is low, which is used to record the depth of field information and will not directly affect the shooting quality. When shooting a sample, the two lenses work together, and a more free background blur effect can be achieved through photo synthesis.

3. Bionic parallelism

Entering 20 14, domestic mobile phones are in the period of innovation, and dual cameras have become their "killer" in the high-end market. Coolpad and Glory have successively launched Coolpad platon and Glory 6 Plus with dual lenses. These products are different from the dual cameras assisted by depth of field, and the dual rear lenses also have corresponding CMOS to take photos with higher pixels, so they are called bionic parallel arrangement.

Technically, this kind of dual lens has larger light input and photosensitive area, and can also realize focusing and virtual aperture adjustment after taking pictures. However, this also requires higher requirements for later software synthesis algorithms.

4, the color is black and white

On the basis of parallel dual cameras, this year we have a color+black and white dual camera. The representative products are domestic models, such as Huawei P9, Qiku Ultimate Edition, Glory 8, Cool Cool 1. Generally, the primary lens will be equipped with a color sensor, and the secondary lens will be a black-and-white sensor with the same pixels. When shooting, the two lenses can work together to synthesize photos, the color lens collects the color of the image, and the black and white lens supplements the brightness and details of the image.

5. Wide-angle assistance

Dual lenses can also be used for wide-angle shooting, and the representative product is LG G5. Although there are two lenses, the shooting part relies more on the main lens, and the auxiliary lens is used as a substitute for the wide-angle lens, which is suitable for shooting wide scenes outdoors. These two lenses cannot be shot at the same time to improve the image quality, but are used separately.

6, optical zoom

Corephotonic has shown an alternative dual-lens prototype before, which can shoot both distant view and close view with lenses with different focal lengths at the same time, and finally achieve a shooting effect similar to optical zoom through software algorithms. Corephotonic calls this kind of camera "computing camera", which makes photos have higher resolution and can reduce noise in low light environment.

It's just a pity that there is no corresponding product equipped with this dual lens technology.

7. 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 take pictures, and the auxiliary lens consists of a wide-angle lens and a motion capture camera. The combination of multiple shots can achieve the effects of motion tracking, depth perception and regional learning, which is our common AR augmented reality.

Main measurement parameters of extended data camera. Resolution (pixel resolution) is one of the most common parameters. The resolution is mainly determined by the image sensor. The higher the resolution, the finer the image and the better the effect, but the image takes up more storage space.

Generally speaking, the camera pixel is the largest pixel in camera mode, and the pixel in camera (video shooting) is usually smaller. For example, the N97 camera has 500W pixels, but the maximum resolution in camera mode is only 640 x480.

Special terms (such as CIF, VGA, etc.) to explain the resolution of mobile phone camera and image resolution. ) is often used to represent resolution (pixel = resolution multiplied by length and width, such as: 640X480=307200, that is, 30W pixels).

Resources Baidu Encyclopedia _ Camera