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How does the Nokia 9 PureView rear five cameras work?Author: Man collection Published: 2020-01-06 09:35
Click to see DxOMark announce Nokia 9 PureView camera evaluation results
Multi-camera smartphones dominate the DxOMark Mobile ranking. One reason is that adding a second camera can enhance details and improve low-light performance, and adding telephoto capabilities is also a successful strategy. Regarding this, DxOMark has been An article on multi-camera smartphones states. The Nokia 9 PureView was launched in February this year, and its rear camera array is equipped with five camera modules powered by Light. The phone is equipped with two color and three monochrome sensors, all equipped with ZEISS lenses, in an attempt to open up a new world of image quality in smartphones. Light, HMD Global (the sole licensor of Nokia phones) and SoC (System-on-Chip) supplier, Qualcomm, work closely with each other to optimize their camera systems. Although the design is technically impressive, DxOMark found in the DxOMark Mobile test that the phone did not fully utilize the potential of the multi-camera in most areas, but its camera array did provide some novel features. Now let's see how it works and what makes it unique.
Nokia 9 PureView rear five camera module
Just looking at the numbers, each camera module used in the Nokia 9 array has fairly typical high-end smartphone specifications: each module has a 12-megapixel sensor (1.24 micron pixels) and a 28mm f / 1.8 fixed focus Lenses; two of them use traditional color sensors and three use monochrome sensors. Therefore, all five modules have the same field of view, and basically all aim at the same scene. These modules are factory calibrated for proper alignment, but are also automatically recalibrated as needed when in use. However, they do not have optical image stabilization.
Nokia 9 PureView rear camera
There is no color filter on the monochromatic module, so it can collect more light and have higher resolution than the color module. The Nokia 9 is not the first smartphone with a monochrome camera, but it is unique in that three monochrome modules are active at the same time. Similarly, although pairing a color module with a monochrome module to improve image quality is not a trivial matter, for the first time the Nokia 9 uses two identical color cameras and an additional monochrome camera to improve image quality.
In fact, five camera modules are active when taking each full-color image, while three monochrome modules are active when taking black-and-white photos. This means that every color image of the Nokia 9 has 60 million pixels of data available; when dealing with difficult scenes, combine up to four closely stacked images together, and a single image can use up to 240 million pixels . Creating an image processing pipeline to process so much data in the ultra-thin smartphone power range requires the tight integration between Light technology (including application specific integrated circuits (ASICs)) and the Qualcomm Snapdragon 845 SoC. For example, in design, the firmware of the 845 chipset can only control up to three cameras at a time, so the ASIC must intervene to coordinate the five-camera system, which is an example of its unique challenge.
More data and intelligent processing can provide higher quality images
Start-up Light's multi-camera technology is designed to capture more data to create better images. The secret is not just to rely on an array of camera modules to capture the image, but also to rely on a processing pipeline to create higher quality image output. Taking five images simultaneously, even when shooting scenes that include sports, helps produce excellent low-light images. This will be a clear advantage over the current night mode, as the current night mode only works well with very little subject motion.
Here is an image taken with zoom. This example shows another big advantage of the Nokia 9 add-on camera module. To illustrate the value of the Nokia 9's multi-camera, DxOMark deliberately obscured four cameras and shot with only one camera in order to compare its results with images taken in normal mode (when five cameras are activated simultaneously). The left version is shot with only one camera (by obscuring the other cameras), while the right image is taken with all cameras active. Users can see that compared to images taken by a single camera, images taken with all cameras have less noise and look more like the result of optical zoom. In contrast, images taken by a single camera look more typical of digital Zoom.
Uncompromising RAW function
Shooting in the RAW format is the traditional golden rule for photographers, but in current smartphone models, shooting in the RAW format usually means abandoning advanced computational imaging that the manufacturer has carefully optimized for a particular phone. However, Light and Nokia created a camera system on the Nokia 9 that can capture 16-bit RAW files, and these files can still use the mobile camera's multi-camera images and fast continuous shooting function.
Nokia has also worked closely with Adobe to find ways to make Lightroom Mobile support RAW files for new phones, but depth effects cannot be modified at this time.
1200-level depth estimation