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DJI R&D Squad
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Helmut Ruch Posted at 8-6 05:31
With DWarp and Rocksteady ON from the full FOV of 155° there are left 116° or 75%. The same result I got when I measured the FOV of my Osmo Action 1 with and without Rocksteady and DWarp. That means, that in this mode only 3000 of the 4000 horizontal pixels of the sensor are used for creating the picture. 4K video needs 3840 horizontal pixel. So it seems to me, that in the 4K-Mode of the OA 1 a 3K video is upscaled to 4K. The 3K picture contains about 5 million pixel, the 4K picture about 8.3 million pixel. This results in 40% of the created datastream beeing interpolated data with no real information. So with the OA 1 I got better results when capturing with 2K7, which uses the full datastream, and upscale to 4K when editing the video. If ever.
What about the OA 4? I read that it uses the same sensor geometry as the OA1, 4000x3000 pixel...
Hi Helmut.
A 4K video with eis does need to be upscaled if it comes from the 4K sensor.
OA4 does 3 things better than OA1:
1.the crop ratio of eis has been improved for rs wide 3840 video. (there are lots of technique in both hardware and software, what we achieve is to get the widest eis video in action camera with least crop ratio. )
2.the buildup upscale algorithm is improved.
3. lens resolution is improved.
As result, there is upscale,
but view the footage in 4K, it fits a 4K video look and is obviously better than 2.7K.
For those crop ratio are high, say horizonsteady(20mm) or narrow (24mm), Action4 only provides 2.7k, because it can never upscale to 4K look.
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