It turns out this is how the astrophotography works on Google Pixel 4

Tram Ho

Astrophotography – a mode that allows you to capture stars and celestial bodies – is not new on smartphones. Huawei P30 Pro has had this feature since March, but as usual, Google’s direction is a little different.

Pixel 4 uses a combination of long exposure, HDR +, and Semantic Segmentation to produce stunning results

If you’ve ever photographed the night sky with a dedicated camera like a DSLR, you’re probably familiar with the term “long exposure” – that’s when you open the camera’s shutter longer than usual to capture more light. This process is nothing special with a sensor as large as on a DSLR, but with a tiny sensor on a phone like the Pixel 4, the light retracted will be much less, so the exposure time will be longer.

The problem with overexposure is that the natural rotation of the Earth will affect the results of your starry sky, and instead of capturing a starry sky, you will get a “star trails” image. white in the sky, appearing by stars in different positions at the beginning and the end of the drying process. So how does Google fix this problem and still allow the Pixel 4 to capture the amount of light needed to get a clear picture?

Astrophotography is integrated into the Night Sight camera mode in Pixel’s native camera app, and will automatically activate when it detects that the scene is dark enough. One shot can take up to 4 minutes to complete, but not that you will expose the whole 4 minutes, but Pixel only expose repeatedly 15 seconds, then put them together in real time, using gyroscope of the phone and computer data to align each exposure with the previous image. Imagine this process as a more advanced form of HDR +, in which some exposure will prioritize highlighting, others prioritize shadow.

Hóa ra đây là cách hoạt động của chế độ chụp ảnh thiên văn trên Google Pixel 4 - Ảnh 1.
Hóa ra đây là cách hoạt động của chế độ chụp ảnh thiên văn trên Google Pixel 4 - Ảnh 2.
Hóa ra đây là cách hoạt động của chế độ chụp ảnh thiên văn trên Google Pixel 4 - Ảnh 3.
Hóa ra đây là cách hoạt động của chế độ chụp ảnh thiên văn trên Google Pixel 4 - Ảnh 4.
Hóa ra đây là cách hoạt động của chế độ chụp ảnh thiên văn trên Google Pixel 4 - Ảnh 5.

Astronomy photos taken from Pixel 4

Google also has a new feature called Semantic Segmentation, similar to Apple’s Deep Fusion: identifying different objects in a photo and processing them separately. Thanks to that, Pixel 4 can sharpen stars and brighten foreground independently of each other. In addition, Google has improved the processing of noise to eliminate random white pixels that may appear in photos.

Putting all of the aforementioned technologies together, the Pixel 4 is capable of producing stunning photos even in pitch-black conditions, as long as you can keep everything in one position long enough. . While one of the advantages of Night Sight is capturing impressive underexposed shots even when you hold the camera in your hand, the nature of the long exposure process forces you to plug the Pixel 4 onto a tripod or place it against a tripod. nearby object.

Whether or not you understand how it works, it is important for astrophotography to go out and take your favorite photos yourself. Carry a tripod of Pixel 4 right away, go somewhere less urban lights, and embark on artistic creation!

Reference: AndroidCentral

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Source : Trí Thức Trẻ