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Blurry zones with Pano mode in low lights
1802 21 2017-11-7
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HugoH
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Hi there,

I've been trying the pano mode in low lights, and some zones appears blurry.
There was about no wind, compass & IMU calibrated yesterday.

Mode M
ISO 100
1/5s

Look at the bottom-center parts :



The weird thing is most of the images seems OK but there are a few that are completely blurry.
Why? They are all show at 1/5s

The result is awesome but I would love to have a fully sharp pic!
2017-11-7
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HugoH
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I've made another one in Auto mode, same kind of issues:

2017-11-7
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Sparkassenkunde
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1/5s is an eternity in photography, even with the use of an gimbal I would expect a lot of blurred pictures. I must admit that I don't know the specifications of the gimbal, these might show the limits for the slowest possible exposure times.
2017-11-7
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HugoH
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Sparkassenkunde Posted at 2017-11-7 11:01
1/5s is an eternity in photography, even with the use of an gimbal I would expect a lot of blurred pictures. I must admit that I don't know the specifications of the gimbal, these might show the limits for the slowest possible exposure times.

I've seen people having the same issues with more light too. For me it's more an issue for the drone not waiting to stop its move before taking the picture. But I have no idea of how I could prove that.

As I said, all the pictures were taken at 1/5s, only a few of them are blurry. So it's not a problem for all pictures, which means the drone can handle sharp 1/5s pictures as the gimbal is stable enough...
2017-11-7
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RaspPiGuy
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Are you stitching these in the app or with something else?  If you look at the 21 source images, are some of them also blurry?  If not, perhaps try something like ICE or PTGui and see if the result is different?
2017-11-7
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Montfrooij
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Could you compare with 1 shot taken in manual mode at about the same settings?
(not from the pano sequence).
It could be true Spark is in a hurry and will already expose before hovering.
I have this sometimes when shooting a ground pano also. Just did not wait enough....
2017-11-7
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DJI Thor
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So it works when in the good light condition, right? Could you please provide the pano and the original pics which stitching the pano to me? Please upload to Dropbox so I can download it. Will help to check. Thank you.
2017-11-8
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medyq69
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in my opinion its blury cuz he cant focus in darker areas + he moves on wind. U can see camera moves in light on big zoom (near river) , they look like taken in long exposure and while camera shake. maybe in monent when left part of photo is taken wind atm was smaller? Remember also that this area can be build not from center areas of photos used to stitch but maybe software taken top and down parts of photos and thats why this picture isnt sharp
2017-11-8
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OneMatt
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DJI Thor Posted at 2017-11-8 03:46
So it works when in the good light condition, right? Could you please provide the pano and the original pics which stitching the pano to me? Please upload to Dropbox so I can download it. Will help to check. Thank you.

I have had the same issue. It appears that when shooting a low light panorama, the drone doesn't wait sufficient time to stop yaw before snapping certain pics. I no longer have the original images to show you (they were blurry, so I deleted them), but if I can describe.

Original 9 shot pano sequence was as follows:

9   3   4
8   1   5
7   2   6

Photos 1-3 are usually good, as it is a mechanically stabilized horizontal movement. The problem appears after yaw movement occurs. 4 will be blurry, the next 2 will be ok. 7 will be HORRIBLE, 8 and 9 OK.

My theory: while the yaw movement has slowed down enough for the electronic image stabilization to "stabilize" the yaw axis, the reality is the aircraft, and the camera sensor, is still physically moving. Therefore, with a slow shutter, you will still get blur on this axis. The next 2 images are clean as the aircraft has physically stopped yawing. 7 is particulaly bad as it is after a large yaw movement, so there is more inertia in the spin, meaning the aircraft is still moving more when the pic is snapped.

My suggestion for a fix: when the camera detects a slow shutter speed, it should wait for the PHYSICAL yaw of the aircraft to drop to a nearly stable threshold before taking the pic.  This may take longer to shoot the sequence, but I'd prefer good pictures than fast pictures.

attached pic was shot on a windy night, but it shows the effect very exaggerated for clarity.

DJI_0001_stitch.jpg

2017-11-8
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OneMatt
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Sparkassenkunde Posted at 2017-11-7 11:01
1/5s is an eternity in photography, even with the use of an gimbal I would expect a lot of blurred pictures. I must admit that I don't know the specifications of the gimbal, these might show the limits for the slowest possible exposure times.

I have done 5 second long exposures on my Phantom with sharp results. Zero wind, of course!
2017-11-8
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Sparkassenkunde
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OneMatt Posted at 2017-11-8 10:44
I have done 5 second long exposures on my Phantom with sharp results. Zero wind, of course!

That sounds promising. I must admit, that the Spark is my first drone and I am just beginning to expand my photographic skills with aerials.

The theory you described in #9 is convincing. So it seems the most reliable workaround before a possible fix via firmware update would be to take the sequence manually.
2017-11-8
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KrzysiekM
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Hi! Don’t know what level of picture quality you are looking for but for simple internet shared panoramas I am quite happy with „auto” settings. In this case it was ISO 600 and 1/1024 s.
https://kuula.co/post/7lccN


Best regards
Krzysiek
2017-11-8
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HugoH
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RaspPiGuy Posted at 2017-11-7 16:01
Are you stitching these in the app or with something else?  If you look at the 21 source images, are some of them also blurry?  If not, perhaps try something like ICE or PTGui and see if the result is different?

Yeah some of the raw pictures are blurry. I stitched them with Lightroom and Autopano.

2017-11-8
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HugoH
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Montfrooij Posted at 2017-11-7 22:52
Could you compare with 1 shot taken in manual mode at about the same settings?
(not from the pano sequence).
It could be true Spark is in a hurry and will already expose before hovering.

So non-pano pictures are perfect in 1/5s. So it's definitively while taking pics in pano mode.
2017-11-8
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HugoH
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DJI Thor Posted at 2017-11-8 03:46
So it works when in the good light condition, right? Could you please provide the pano and the original pics which stitching the pano to me? Please upload to Dropbox so I can download it. Will help to check. Thank you.

I don't know for good conditions lights. Never tried them. I can try if you want.

Here is a link from Google Drive (I don't have dropbox): https://drive.google.com/open?id ... 6wWOXYjktWf-UsaC-di

There are 3 folders:

1. M 1/5s with some of the pics which are blurry.
2. Auto (Spark chose 1/15s by itself) with some pics blurry
3. A 360 pano (auto) with some blurry pics again

I can also provide a log flight if required.
I'm pretty sure I can try it again another evening to reproduce and shorten the flight log

Thanks for your help!
2017-11-8
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HugoH
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OneMatt Posted at 2017-11-8 08:29
I have had the same issue. It appears that when shooting a low light panorama, the drone doesn't wait sufficient time to stop yaw before snapping certain pics. I no longer have the original images to show you (they were blurry, so I deleted them), but if I can describe.

Original 9 shot pano sequence was as follows:

As I'm not the only one having this problem, I'm pretty sure this is an "hurry" issue from the Spark

Maybe we'll have a fix someday
2017-11-8
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HugoH
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KrzysiekM Posted at 2017-11-8 11:10
Hi! Don’t know what level of picture quality you are looking for but for simple internet shared panoramas I am quite happy with „auto” settings. In this case it was ISO 600 and 1/1024 s.
https://kuula.co/post/7lccN

Hi,

Really nice shot. I'm surprised that there is not more noise at ISO 600...

I wanted to try some low-iso panorama, so I can use it for print later (not this one, but other shots).

I'll try with higher ISO but it also comes with more noise
2017-11-8
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Montfrooij
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HugoH Posted at 2017-11-8 11:46
So non-pano pictures are perfect in 1/5s. So it's definitively while taking pics in pano mode.

I can imagine that the fast pace in which Spark takes pictures is causing issues.
2017-11-8
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KrzysiekM
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I have also noticed a few blurry shots in panorama mode, especially using manual settings (lower ISO/longer exposure). I wonder if there are some combinations of Spark angles to wind direction that our dron doesn’t like. Or gimbal more precisely. As it is not stabilised on all axes and Spark doesn’t use digital stabilisation in photo mode I think.

In this example auto mode was set at ISO 800 and 1/76 s. For web resolution I am quite happy with the results.

2017-11-8
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DJI Thor
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OneMatt Posted at 2017-11-8 08:29
I have had the same issue. It appears that when shooting a low light panorama, the drone doesn't wait sufficient time to stop yaw before snapping certain pics. I no longer have the original images to show you (they were blurry, so I deleted them), but if I can describe.

Original 9 shot pano sequence was as follows:

Thanks a lot for your feedback. I will forward this to our engineers and see if there are other ways to solve it. Will come back to here when I hear back. Appreciate your patience.
2017-11-11
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DJI Thor
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HugoH Posted at 2017-11-8 11:49
I don't know for good conditions lights. Never tried them. I can try if you want.

Here is a link from Google Drive (I don't have dropbox): https://drive.google.com/open?id=1IZCnfPRAQkLrG6wWOXYjktWf-UsaC-di

Noted with thanks. Will forward to our engineers to check, appreciate your patience.
2017-11-11
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HugoH
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Thanks a lot Thor! Hope there is some ways to solve it
2017-11-13
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