Polyethylene
2018-10-23 16:09:11
Rather than simply rely on long exposures for low light photography, 'Night Sight' utilizes HDR+ burst mode photography to take usable photos in very dark situations. Previously, the Pixel 2 would never drop below 1/15s shutter speed, simply because it needed faster shutter speeds to maintain that 9-frame buffer with zero shutter lag. That does mean that even the Pixel 2 could, in very low light, effectively sample 0.6 seconds (9 x 1/15s), but sometimes that's not even enough to get a usable photo in extremely dark situations.
The Pixel 3 now has a 'Night Sight' mode which sacrifices the zero shutter lag and expects you to hold the camera steady after you've pressed the shutter button. When you do so, the camera will merge up to 15 frames, each with shutter speeds as low as, say, 1/3s, to get you an image equivalent to a 5 second exposure. But without the motion blur that would inevitably result from such a long exposure.
Put simply: even though there might be subject or handheld movement over the entire 5s span of the 15 frame burst, many of the the 1/3s 'snapshots' of that burst are likely to still be sharp, albeit possibly displaced relative to one another. The tile-based alignment of Google's 'robust merge' technology, however, can handle inter-frame movement by aligning objects that have moved and discarding tiles of any frame that have too much motion blur.
Furthermore, Night Sight mode takes a machine-learning based approach to auto white balance. It's often very difficult to determine the dominant light source in such dark environments, so Google has opted to use learning-based AWB to yield natural looking images.
影片資訊欄中有提供下載點
https://youtu.be/FTZMhWo0l9E
這成像真的
根本是低光源救星XD
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