Hi,
I’m wondering what the sensor resolution of the Action 4 is. If Standard Field Of View is in 4K already, then the sensor must have even more pixels for the wider views, right? Or is the Standard Field Of View a digital zoom?

And for stabilization? Is this doing a digital crop, or is the sensor resolution that high so that even that is true 4K?

Thanks for any info!

Best,
Johannes

The specifications indicate that the sensor has a native resolution of 12 Mp, recording at 4k (3840x2160) uses (more or less) 8Mp, the rest will be used for cropping and stabilization....

Have a look at the end of this thread:
https://forum.dji.com/forum.php?mod=viewthread&tid=295310

Thanks for your answer. Where did you find this 12MP spec? I just took a raw photo with the cam, it has 4000x2256 (=9MP). Normally, raw photos are just a readout of the sensor, so I was assuming that this would be the sensor resolution... Well then, 12MP would be good news ;)

Helmut Ruch Posted at 10-9 00:29
Have a look at the end of this thread:
https://forum.dji.com/forum.php?mod=viewthread&tid=295310

Thanks! So, this sounds like the image gets upscaled, right?

Johannes Posted at 10-9 00:38
Thanks! So, this sounds like the image gets upscaled, right?

At least with Rocksteady ON.

OA4 have 10MP sensor, I guess it is the same sensor as Samsung S21 (taken from Sony's IMX chart).
Gopro have more MP but still can't  produce better footage than OA4 since OA4 have wider FOV + sharper lens etc.

When you compare footage from OA3 vs OA4 where OA3 have 12MP sensor, there is clearly a better footage coming from OA4.

johansenfoto Posted at 10-9 01:26
OA4 have 10MP sensor, I guess it is the same sensor as Samsung S21 (taken from Sony's IMX chart).
Gopro have more MP but still can't  produce better footage than OA4 since OA4 have wider FOV + sharper lens etc.

The OA 4 has the same sensor as the Air 3, right? And this sensor is described in the manual as 1 1/3" with effectiv 48 megapixel. The photo resolution of the Air 3 is 12 MP. This sensor is a "Quad Bayer Sensor". It has a 12 megapixel Bayer color filter matrix (4000x3000 pixel) and a 48 MP photo diode matrix, 4 diodes for each pixel. These can be controlled independently. So you have multiple electronical sensors under one Bayer matrix. With these you can do "One Shot HDR". This is the standard mode of the OA 4, there is no special HDR mode anymore. And this might be the reason why the OA 4 produces more heat then the OA 3. There is a lot of calculation to be done in this mode.
Why only 10 MP photo resolution with the OA 4? I think they wanted to reduce the extreme FOV and croped the picture a little bit. The wide angle camera of the Air 3 has a FOV of only 88°.

So are you saying it has Software interpolation enhancements?

Fishycomics Posted at 10-9 03:41
So are you saying it has Software interpolation enhancements?

See the last comment in this thread:
https://forum.dji.com/forum.php?mod=viewthread&tid=295310
where a DJI Official answerd your question.

Helmut Ruch Posted at 10-9 04:06
See the last comment in this thread:
https://forum.dji.com/forum.php?mod=viewthread&tid=295310
where a DJI Official answerd your question.

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.

Helmut Ruch Posted at 10-9 02:22
The OA 4 has the same sensor as the Air 3, right? And this sensor is described in the manual as 1 1/3" with effectiv 48 megapixel. The photo resolution of the Air 3 is 12 MP. This sensor is a "Quad Bayer Sensor". It has a 12 megapixel Bayer color filter matrix (4000x3000 pixel) and a 48 MP photo diode matrix, 4 diodes for each pixel. These can be controlled independently. So you have multiple electronical sensors under one Bayer matrix. With these you can do "One Shot HDR". This is the standard mode of the OA 4, there is no special HDR mode anymore. And this might be the reason why the OA 4 produces more heat then the OA 3. There is a lot of calculation to be done in this mode.
Why only 10 MP photo resolution with the OA 4? I think they wanted to reduce the extreme FOV and croped the picture a little bit. The wide angle camera of the Air 3 has a FOV of only 88°.

I also heard rumors that Air 3 and OA4 have the same sensor, but we have no stated facts from DJI or anyone taken it apart to check.
So I go with IMX list from Sony and have to trust what DJI told us.
But yeah there is probably possible to squeese out more MP with some internal magic that is above my knowledge.

HDR on OA4 is probably the same as Enhanced Color Mode that OA3 came with, and it is close to or as good as the HDR mode from my own tests last year (HDR vs Enhanced).
So true HDR it will never be, but some internal mix with highlights/shadows + more. So there will not be ghosting like it could be on OA3 HDR mode.

More heat get produced since the sensor is bigger + OA4 consume a little bit more power compared to OA3.

Hi there, Johannes. Additionally, you can visit our website to check for further information about the Action 4 specs: https://www.dji.com/global/osmo-action-4/specs, https://dl.djicdn.com/downloads/ ... _Manual_v1.2_en.pdf. Have a great day.

DJI Tony Posted at 10-9 21:27
Hi there, Johannes. Additionally, you can visit our website to check for further information about the Action 4 specs: https://www.dji.com/global/osmo-action-4/specs, https://dl.djicdn.com/downloads/DJI_Osmo_Action_4/UM/20230906/DJI_Osmo_Action_4_User_Manual_v1.2_en.pdf. Have a great day.

Auto answer
But still we need to know which IMX sensor it have, so where is that info?

DJI will not tell you what sensor is inside, best of luck to that. Well it says 4K so its 4K,  but people out there watch on 4K smartphones so it has to be 4K   

I guess it is one of theese, IMX374 or IMX754.
Those is the only ones I could find with 10MP.

johansenfoto Posted at 10-10 03:58
I guess it is one of theese, IMX374 or IMX754.
Those is the only ones I could find with 10MP.

Action 4 sensor has 2.4μm pixel size

R4Dives Posted at 10-10 04:55
Action 4 sensor has 2.4μm pixel size

Where do you have that from?

johansenfoto Posted at 10-10 06:28
Where do you have that from?

Look here:

https://www.dji.com/de/osmo-action-4

1/1,3-Zoll * Kamerasensor

Bist du mit der Action 4 unterwegs, entfaltet selbst das kleinste Pixel sein volles Potential. Eine breite f/2,8-Blende und eine äquivalente Pixelgröße von 2,4 μm sorgen für Aufnahmen voller Details, von Sonnenauf- bis Sonnenuntergang und weit darüber hinaus...

If I understand the data in your IMX-table well, the IMX374 has a sensor size of 1/3.2", the IMX754 a size of 1/3.52". Thats both around 1/3". Far away from the 1/1.3" = 3/4" of the OA4!
The real size of the 1 1/3" sensor is 9.98 x 7.5 mm. 2.4 μm x 4000 = 9.6 mm, 2.4 μm x 3000 = 7.2 mm. Looks ok.

Helmut Ruch Posted at 10-10 07:33
Look here:

https://www.dji.com/de/osmo-action-4

I see that now, thanks.

Well then it is none of those sensors either.

Generic comment to get points up....

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Can't we get the exact sensor implemented and specifications from the FCC since they had to register the device there for sale in the United States?

Very interesting thread.  I just bought a OA 4.  Kinda disappointed to see this.  With any product nowadays, there is so much fine print.  Sounds like the only way to get native 4K is with Rocksteady off.  I don't want upscaling.  So, I guess maybe it's best to shoot at 2.7K since I use RS?  I've been downsampling my 4K videos to 1080 on export.