On March 27th, Xiaomi MIX 2S was officially released! The famous camera evaluation agency DxOMark scored 101 points in a single shot, which is in line with Apple iPhone X. Xiaomi MIX 2S has also become the best millet phone to date.
Xiaomi MIX 2S rear lens is equipped with 12 million (wide-angle) + 12 million (telephoto) dual camera, the main Sensor uses Sony IMX363, has a large 1.4μm unit pixel size, and supports Dual PD (double-core focus) in focus mode. , greatly improved the focus performance of the phone, we will analyze this technology in detail below.
Dual-core focus is a professional focus technology derived from SLR
Full-pixel dual-core focusing is actually a professional focusing technology from SLR cameras. The first SLR camera to use this technology is the Canon 70D. Traditional SLR cameras have been able to achieve very fast and accurate focus in optical framing mode thanks to phase focusing.
However, when the SLR camera is in the live view mode, the phase detection focus used in the optical view mode cannot be used because the reflector is raised. The focus speed of the "contrast focus" used is far less than that of the phase focus. The full-pixel dual-core focusing technology on the Canon 70D effectively solves this problem.
The principle of full-pixel dual-core focusing
A sensor that uses PDAF phase focusing has only one photodiode per pixel. In order to obtain complete phase information, this requires two pixels to participate in focusing. Moreover, the two pixels need to cover half of the pixel area to obtain the parallax information. If you compare each pixel to a person's eyes, just as his eyes are blindfolded, leaving only one other to focus, which requires two people to complete a focus operation. The more pixels that participate in focusing, the faster the focusing speed. Of course, the fewer pixels responsible for imaging, the more serious the image quality loss of the sensor, so the current manufacturer will control the pixel ratio of focusing to about 3%.
*Image from Canon's official website
The full-pixel dual-core focusing technology is equipped with two photodiodes for each pixel on the camera sensor, which can obtain two signals at the same time, just like one person's eyes can be used for focusing operation. When the lens is in focus, the lens is driven to complete the focusing operation by comparing the parallax signals of both. When image capturing is performed, two signals are combined and output as one image signal. This allows you to achieve both autofocus and image capture without compromising image quality.
That is to say, in theory, the main camera of the Xiaomi MIX 2S does have 2400 (2*1200) megapixels, but since every two pixels share a set of imaging systems, and there is no gap between the two, So the actual number of imaging output pixels is still 12 million. Its focusing unit is more than 30 times that of traditional PDAF phase focusing.
Xiaomi MIX 2S dark light focusing speed is very fast
We compare the Xiaomi MIX 2S and Apple's latest flagship iPhoneX for focusing speed in low light conditions. The Apple iPhone X uses ordinary phase focusing technology, while the Xiaomi MIX 2S is full-pixel dual-core focusing. From the comparison video, we can clearly see that under this extremely low light condition, the focus speed of Xiaomi MIX 2S exceeds that of Apple iPhone X, and the advantage of dual-core focusing is very obvious.
Xiaomi MIX 2S dark light focus speed test
to sum up:
Xiaomi MIX 2S introduces full-pixel dual-core focusing technology, which greatly enhances the camera's focusing performance. With the addition of 1.4μm large unit pixels and wide-angle + telephoto dual camera, DxOMark's single-item score is 101 points. Take pictures of the best millet phone - Xiaomi MIX 2S, you deserve it.
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