Hi guys
I can see how to import the location and orentation data for each image, but I would like to know how to import or set the accuracy of the location data.
I'm importing images from the DJI Phantom 4 RTK and have accuracies for each photo. These values range from about 20mm to 3m depending on if it had RTK initialisation or not at the time.
Pix4D automatically reads this information from the images.
I am surveying with check points only, so the accuracy of the photos is very important.
As a side issue version 4.4.11.60 does not recognise the camera parameters for the 'undistorted' images from the DJI Phantom 4 RTK.
Cheers
Caleb
P4 doesn't have fisheye lens it has 94° FOV wide angle lens. I am not aware of any corrections applied by P4 for barrel distortion in firmware. Maybe you are confusing with rolling shutter eefeff? Yes Pix4D has rolling shutter adjustment but it doesn't actually give better results.
Hi Oto. I'm not an expert on the technical difference between fisheye and rectilinear. But this thread makes it clear that corrections are made onboard the drone to make images with nice straight lines https://forum.dji.com/thread-83571-1-1.html.
Have you used the Phantom 4 RTK?
I can tell you as a fact that you have a choice in images it will output - With or without 'distortion correction'.
When using 'with distortion correction' the camera lens parameters for the Phantom 4 Pro work. Pix4D classifies this as a 'rectilinear lens'. With this setting straight lines look nice and straight.
When using 'without distortion correction' the camera lens parameters for the Phantom 4 RTK work.Pix4D classifies this as a 'fisheye lens'. With this setting straight lines look warped near the photo edges, just like the Phantom 2. Pix4D also classified the P2 lens as fisheye.
I don't know if Pix4D is using the correct terminology or not, all I know is what works and what doesn't.
Nothing to do with rolling shutter.
I have tried RTK dataset it works well but got strange results regarding altitude. Contextcapture has fisheye lens setting which you could try.
But if it is so that if using JPG the DJI already uses some fancy barrel distortion removal then it could explain why even if using precalibration I still sometimes get curved model. Will try to check with RAW/DNG format how it looks then.